July 2023 - Linux-kselftest-mirror

[syzbot] WARNING in btrfs_free_reserved_data_space_noquota

by syzbot

Hello, syzbot found the following issue on: HEAD commit: b7b275e60bcd Linux 6.1-rc7 git tree: upstream console+strace: https://syzkaller.appspot.com/x/log.txt?x=158a7b73880000 kernel config: https://syzkaller.appspot.com/x/.config?x=2325e409a9a893e1 dashboard link: https://syzkaller.appspot.com/bug?extid=adec8406ad17413d4c06 compiler: Debian clang version 13.0.1-++20220126092033+75e33f71c2da-1~exp1~20220126212112.63, GNU ld (GNU Binutils for Debian) 2.35.2 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=169ccb75880000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=17bf7153880000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/525233126d34/disk-b7b275e6.raw… vmlinux: https://storage.googleapis.com/syzbot-assets/e8299bf41400/vmlinux-b7b275e6.… kernel image: https://storage.googleapis.com/syzbot-assets/eebf691dbf6f/bzImage-b7b275e6.… mounted in repro: https://storage.googleapis.com/syzbot-assets/5423c2d2ad62/mount_0.gz The issue was bisected to: commit c814bf958926ff45a9c1e899bd001006ab6cfbae Author: ye xingchen <ye.xingchen(a)zte.com.cn> Date: Tue Aug 16 10:51:06 2022 +0000 powerpc/selftests: Use timersub() for gettimeofday() bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=118c3d03880000 final oops: https://syzkaller.appspot.com/x/report.txt?x=138c3d03880000 console output: https://syzkaller.appspot.com/x/log.txt?x=158c3d03880000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+adec8406ad17413d4c06(a)syzkaller.appspotmail.com Fixes: c814bf958926 ("powerpc/selftests: Use timersub() for gettimeofday()") RDX: 0000000000000001 RSI: 0000000020000280 RDI: 0000000000000005 RBP: 00007ffd32e91c70 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000008000000 R11: 0000000000000246 R12: 0000000000000006 R13: 00007ffd32e91cb0 R14: 00007ffd32e91c90 R15: 0000000000000006 </TASK> ------------[ cut here ]------------ WARNING: CPU: 1 PID: 3764 at fs/btrfs/space-info.h:122 btrfs_space_info_free_bytes_may_use fs/btrfs/space-info.h:154 [inline] WARNING: CPU: 1 PID: 3764 at fs/btrfs/space-info.h:122 btrfs_free_reserved_data_space_noquota+0x219/0x2b0 fs/btrfs/delalloc-space.c:179 Modules linked in: CPU: 1 PID: 3764 Comm: syz-executor759 Not tainted 6.1.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 RIP: 0010:btrfs_space_info_update_bytes_may_use fs/btrfs/space-info.h:122 [inline] RIP: 0010:btrfs_space_info_free_bytes_may_use fs/btrfs/space-info.h:154 [inline] RIP: 0010:btrfs_free_reserved_data_space_noquota+0x219/0x2b0 fs/btrfs/delalloc-space.c:179 Code: 2f 00 74 08 4c 89 ef e8 b5 98 32 fe 49 8b 5d 00 48 89 df 4c 8b 74 24 08 4c 89 f6 e8 21 81 de fd 4c 39 f3 73 16 e8 d7 7e de fd <0f> 0b 31 db 4c 8b 34 24 41 80 3c 2f 00 75 8c eb 92 e8 c1 7e de fd RSP: 0018:ffffc9000443f410 EFLAGS: 00010293 RAX: ffffffff83ac1919 RBX: 00000000005cb000 RCX: ffff888027989d40 RDX: 0000000000000000 RSI: 0000000000800000 RDI: 00000000005cb000 RBP: dffffc0000000000 R08: ffffffff83ac190f R09: fffffbfff1cebe0e R10: fffffbfff1cebe0e R11: 1ffffffff1cebe0d R12: ffff8880774f3800 R13: ffff8880774f3860 R14: 0000000000800000 R15: 1ffff1100ee9e70c FS: 0000555555aaa300(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f0d98f20140 CR3: 0000000025ccf000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> btrfs_free_reserved_data_space+0x9d/0xd0 fs/btrfs/delalloc-space.c:199 btrfs_dio_iomap_begin+0x8f7/0x1070 fs/btrfs/inode.c:7762 iomap_iter+0x606/0x8a0 fs/iomap/iter.c:74 __iomap_dio_rw+0xd91/0x20d0 fs/iomap/direct-io.c:601 btrfs_dio_write+0x9c/0xe0 fs/btrfs/inode.c:8094 btrfs_direct_write fs/btrfs/file.c:1835 [inline] btrfs_do_write_iter+0x871/0x1260 fs/btrfs/file.c:1980 do_iter_write+0x6c2/0xc20 fs/read_write.c:861 vfs_writev fs/read_write.c:934 [inline] do_pwritev+0x200/0x350 fs/read_write.c:1031 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f0d98ea8ea9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 41 15 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffd32e91c38 EFLAGS: 00000246 ORIG_RAX: 0000000000000148 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f0d98ea8ea9 RDX: 0000000000000001 RSI: 0000000020000280 RDI: 0000000000000005 RBP: 00007ffd32e91c70 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000008000000 R11: 0000000000000246 R12: 0000000000000006 R13: 00007ffd32e91cb0 R14: 00007ffd32e91c90 R15: 0000000000000006 </TASK> --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller(a)googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. For information about bisection process see: https://goo.gl/tpsmEJ#bisection syzbot can test patches for this issue, for details see: https://goo.gl/tpsmEJ#testing-patches

3 days, 13 hours

3
3
0 0

[PATCH v6] lib: add basic KUnit test for lib/math

by Daniel Latypov

Add basic test coverage for files that don't require any config options: * part of math.h (what seem to be the most commonly used macros) * gcd.c * lcm.c * int_sqrt.c * reciprocal_div.c (Ignored int_pow.c since it's a simple textbook algorithm.) These tests aren't particularly interesting, but they * provide short and simple examples of parameterized tests * provide a place to add tests for any new files in this dir * are written so adding new test cases to cover edge cases should be easy * looking at code coverage, we hit all the branches in the .c files Signed-off-by: Daniel Latypov <dlatypov(a)google.com> Reviewed-by: David Gow <davidgow(a)google.com> --- Changes since v5: * add in test cases for roundup/rounddown * address misc comments from David Changes since v4: * add in test cases for some math.h macros (abs, round_up/round_down, div_round_down/closest) * use parameterized testing less to keep things terser Changes since v3: * fix `checkpatch.pl --strict` warnings * add test cases for gcd(0,0) and lcm(0,0) * minor: don't test both gcd(a,b) and gcd(b,a) when a == b Changes since v2: mv math_test.c => math_kunit.c Changes since v1: * Rebase and rewrite to use the new parameterized testing support. * misc: fix overflow in literal and inline int_sqrt format string. * related: commit 1f0e943df68a ("Documentation: kunit: provide guidance for testing many inputs") was merged explaining the patterns shown here. * there's an in-flight patch to update it for parameterized testing. --- lib/math/Kconfig | 12 ++ lib/math/Makefile | 2 + lib/math/math_kunit.c | 291 ++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 305 insertions(+) create mode 100644 lib/math/math_kunit.c diff --git a/lib/math/Kconfig b/lib/math/Kconfig index f19bc9734fa7..a974d4db0f9c 100644 --- a/lib/math/Kconfig +++ b/lib/math/Kconfig @@ -15,3 +15,15 @@ config PRIME_NUMBERS config RATIONAL bool + +config MATH_KUNIT_TEST + tristate "KUnit test for lib/math and math.h" if !KUNIT_ALL_TESTS + depends on KUNIT + default KUNIT_ALL_TESTS + help + This builds unit tests for lib/math and math.h. + + For more information on KUnit and unit tests in general, please refer + to the KUnit documentation in Documentation/dev-tools/kunit/. + + If unsure, say N. diff --git a/lib/math/Makefile b/lib/math/Makefile index be6909e943bd..30abb7a8d564 100644 --- a/lib/math/Makefile +++ b/lib/math/Makefile @@ -4,3 +4,5 @@ obj-y += div64.o gcd.o lcm.o int_pow.o int_sqrt.o reciprocal_div.o obj-$(CONFIG_CORDIC) += cordic.o obj-$(CONFIG_PRIME_NUMBERS) += prime_numbers.o obj-$(CONFIG_RATIONAL) += rational.o + +obj-$(CONFIG_MATH_KUNIT_TEST) += math_kunit.o diff --git a/lib/math/math_kunit.c b/lib/math/math_kunit.c new file mode 100644 index 000000000000..556c23b17c3c --- /dev/null +++ b/lib/math/math_kunit.c @@ -0,0 +1,291 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Simple KUnit suite for math helper funcs that are always enabled. + * + * Copyright (C) 2020, Google LLC. + * Author: Daniel Latypov <dlatypov(a)google.com> + */ + +#include <kunit/test.h> +#include <linux/gcd.h> +#include <linux/kernel.h> +#include <linux/lcm.h> +#include <linux/reciprocal_div.h> + +static void abs_test(struct kunit *test) +{ + KUNIT_EXPECT_EQ(test, abs((char)0), (char)0); + KUNIT_EXPECT_EQ(test, abs((char)42), (char)42); + KUNIT_EXPECT_EQ(test, abs((char)-42), (char)42); + + /* The expression in the macro is actually promoted to an int. */ + KUNIT_EXPECT_EQ(test, abs((short)0), 0); + KUNIT_EXPECT_EQ(test, abs((short)42), 42); + KUNIT_EXPECT_EQ(test, abs((short)-42), 42); + + KUNIT_EXPECT_EQ(test, abs(0), 0); + KUNIT_EXPECT_EQ(test, abs(42), 42); + KUNIT_EXPECT_EQ(test, abs(-42), 42); + + KUNIT_EXPECT_EQ(test, abs(0L), 0L); + KUNIT_EXPECT_EQ(test, abs(42L), 42L); + KUNIT_EXPECT_EQ(test, abs(-42L), 42L); + + KUNIT_EXPECT_EQ(test, abs(0LL), 0LL); + KUNIT_EXPECT_EQ(test, abs(42LL), 42LL); + KUNIT_EXPECT_EQ(test, abs(-42LL), 42LL); + + /* Unsigned types get casted to signed. */ + KUNIT_EXPECT_EQ(test, abs(0ULL), 0LL); + KUNIT_EXPECT_EQ(test, abs(42ULL), 42LL); +} + +static void int_sqrt_test(struct kunit *test) +{ + KUNIT_EXPECT_EQ(test, int_sqrt(0UL), 0UL); + KUNIT_EXPECT_EQ(test, int_sqrt(1UL), 1UL); + KUNIT_EXPECT_EQ(test, int_sqrt(4UL), 2UL); + KUNIT_EXPECT_EQ(test, int_sqrt(5UL), 2UL); + KUNIT_EXPECT_EQ(test, int_sqrt(8UL), 2UL); + KUNIT_EXPECT_EQ(test, int_sqrt(1UL << 30), 1UL << 15); +} + +static void round_up_test(struct kunit *test) +{ + KUNIT_EXPECT_EQ(test, round_up(0, 1), 0); + KUNIT_EXPECT_EQ(test, round_up(1, 2), 2); + KUNIT_EXPECT_EQ(test, round_up(3, 2), 4); + KUNIT_EXPECT_EQ(test, round_up((1 << 30) - 1, 2), 1 << 30); + KUNIT_EXPECT_EQ(test, round_up((1 << 30) - 1, 1 << 29), 1 << 30); +} + +static void round_down_test(struct kunit *test) +{ + KUNIT_EXPECT_EQ(test, round_down(0, 1), 0); + KUNIT_EXPECT_EQ(test, round_down(1, 2), 0); + KUNIT_EXPECT_EQ(test, round_down(3, 2), 2); + KUNIT_EXPECT_EQ(test, round_down((1 << 30) - 1, 2), (1 << 30) - 2); + KUNIT_EXPECT_EQ(test, round_down((1 << 30) - 1, 1 << 29), 1 << 29); +} + +/* These versions can round to numbers that aren't a power of two */ +static void roundup_test(struct kunit *test) +{ + KUNIT_EXPECT_EQ(test, roundup(0, 1), 0); + KUNIT_EXPECT_EQ(test, roundup(1, 2), 2); + KUNIT_EXPECT_EQ(test, roundup(3, 2), 4); + KUNIT_EXPECT_EQ(test, roundup((1 << 30) - 1, 2), 1 << 30); + KUNIT_EXPECT_EQ(test, roundup((1 << 30) - 1, 1 << 29), 1 << 30); + + KUNIT_EXPECT_EQ(test, roundup(3, 2), 4); + KUNIT_EXPECT_EQ(test, roundup(4, 3), 6); +} + +static void rounddown_test(struct kunit *test) +{ + KUNIT_EXPECT_EQ(test, rounddown(0, 1), 0); + KUNIT_EXPECT_EQ(test, rounddown(1, 2), 0); + KUNIT_EXPECT_EQ(test, rounddown(3, 2), 2); + KUNIT_EXPECT_EQ(test, rounddown((1 << 30) - 1, 2), (1 << 30) - 2); + KUNIT_EXPECT_EQ(test, rounddown((1 << 30) - 1, 1 << 29), 1 << 29); + + KUNIT_EXPECT_EQ(test, rounddown(3, 2), 2); + KUNIT_EXPECT_EQ(test, rounddown(4, 3), 3); +} + +static void div_round_up_test(struct kunit *test) +{ + KUNIT_EXPECT_EQ(test, DIV_ROUND_UP(0, 1), 0); + KUNIT_EXPECT_EQ(test, DIV_ROUND_UP(20, 10), 2); + KUNIT_EXPECT_EQ(test, DIV_ROUND_UP(21, 10), 3); + KUNIT_EXPECT_EQ(test, DIV_ROUND_UP(21, 20), 2); + KUNIT_EXPECT_EQ(test, DIV_ROUND_UP(21, 99), 1); +} + +static void div_round_closest_test(struct kunit *test) +{ + KUNIT_EXPECT_EQ(test, DIV_ROUND_CLOSEST(0, 1), 0); + KUNIT_EXPECT_EQ(test, DIV_ROUND_CLOSEST(20, 10), 2); + KUNIT_EXPECT_EQ(test, DIV_ROUND_CLOSEST(21, 10), 2); + KUNIT_EXPECT_EQ(test, DIV_ROUND_CLOSEST(25, 10), 3); +} + +/* Generic test case for unsigned long inputs. */ +struct test_case { + unsigned long a, b; + unsigned long result; +}; + +static struct test_case gcd_cases[] = { + { + .a = 0, .b = 0, + .result = 0, + }, + { + .a = 0, .b = 1, + .result = 1, + }, + { + .a = 2, .b = 2, + .result = 2, + }, + { + .a = 2, .b = 4, + .result = 2, + }, + { + .a = 3, .b = 5, + .result = 1, + }, + { + .a = 3 * 9, .b = 3 * 5, + .result = 3, + }, + { + .a = 3 * 5 * 7, .b = 3 * 5 * 11, + .result = 15, + }, + { + .a = 1 << 21, + .b = (1 << 21) - 1, + .result = 1, + }, +}; + +KUNIT_ARRAY_PARAM(gcd, gcd_cases, NULL); + +static void gcd_test(struct kunit *test) +{ + const char *message_fmt = "gcd(%lu, %lu)"; + const struct test_case *test_param = test->param_value; + + KUNIT_EXPECT_EQ_MSG(test, test_param->result, + gcd(test_param->a, test_param->b), + message_fmt, test_param->a, + test_param->b); + + if (test_param->a == test_param->b) + return; + + /* gcd(a,b) == gcd(b,a) */ + KUNIT_EXPECT_EQ_MSG(test, test_param->result, + gcd(test_param->b, test_param->a), + message_fmt, test_param->b, + test_param->a); +} + +static struct test_case lcm_cases[] = { + { + .a = 0, .b = 0, + .result = 0, + }, + { + .a = 0, .b = 1, + .result = 0, + }, + { + .a = 1, .b = 2, + .result = 2, + }, + { + .a = 2, .b = 2, + .result = 2, + }, + { + .a = 3 * 5, .b = 3 * 7, + .result = 3 * 5 * 7, + }, +}; + +KUNIT_ARRAY_PARAM(lcm, lcm_cases, NULL); + +static void lcm_test(struct kunit *test) +{ + const char *message_fmt = "lcm(%lu, %lu)"; + const struct test_case *test_param = test->param_value; + + KUNIT_EXPECT_EQ_MSG(test, test_param->result, + lcm(test_param->a, test_param->b), + message_fmt, test_param->a, + test_param->b); + + if (test_param->a == test_param->b) + return; + + /* lcm(a,b) == lcm(b,a) */ + KUNIT_EXPECT_EQ_MSG(test, test_param->result, + lcm(test_param->b, test_param->a), + message_fmt, test_param->b, + test_param->a); +} + +struct u32_test_case { + u32 a, b; + u32 result; +}; + +static struct u32_test_case reciprocal_div_cases[] = { + { + .a = 0, .b = 1, + .result = 0, + }, + { + .a = 42, .b = 20, + .result = 2, + }, + { + .a = 42, .b = 9999, + .result = 0, + }, + { + .a = (1 << 16), .b = (1 << 14), + .result = 1 << 2, + }, +}; + +KUNIT_ARRAY_PARAM(reciprocal_div, reciprocal_div_cases, NULL); + +static void reciprocal_div_test(struct kunit *test) +{ + const struct u32_test_case *test_param = test->param_value; + struct reciprocal_value rv = reciprocal_value(test_param->b); + + KUNIT_EXPECT_EQ_MSG(test, test_param->result, + reciprocal_divide(test_param->a, rv), + "reciprocal_divide(%u, %u)", + test_param->a, test_param->b); +} + +static void reciprocal_scale_test(struct kunit *test) +{ + KUNIT_EXPECT_EQ(test, reciprocal_scale(0u, 100), 0u); + KUNIT_EXPECT_EQ(test, reciprocal_scale(1u, 100), 0u); + KUNIT_EXPECT_EQ(test, reciprocal_scale(1u << 4, 1 << 28), 1u); + KUNIT_EXPECT_EQ(test, reciprocal_scale(1u << 16, 1 << 28), 1u << 12); + KUNIT_EXPECT_EQ(test, reciprocal_scale(~0u, 1 << 28), (1u << 28) - 1); +} + +static struct kunit_case math_test_cases[] = { + KUNIT_CASE(abs_test), + KUNIT_CASE(int_sqrt_test), + KUNIT_CASE(round_up_test), + KUNIT_CASE(round_down_test), + KUNIT_CASE(roundup_test), + KUNIT_CASE(rounddown_test), + KUNIT_CASE(div_round_up_test), + KUNIT_CASE(div_round_closest_test), + KUNIT_CASE_PARAM(gcd_test, gcd_gen_params), + KUNIT_CASE_PARAM(lcm_test, lcm_gen_params), + KUNIT_CASE_PARAM(reciprocal_div_test, reciprocal_div_gen_params), + KUNIT_CASE(reciprocal_scale_test), + {} +}; + +static struct kunit_suite math_test_suite = { + .name = "lib-math", + .test_cases = math_test_cases, +}; + +kunit_test_suites(&math_test_suite); + +MODULE_LICENSE("GPL v2"); base-commit: 7e25f40eab52c57ff6772d27d2aef3640a3237d7 -- 2.31.1.368.gbe11c130af-goog

3 days, 14 hours

5
5
0 0

[PATCH v6 1/2] posix-timers: Prefer delivery of signals to the current thread

by Marco Elver

From: Dmitry Vyukov <dvyukov(a)google.com> POSIX timers using the CLOCK_PROCESS_CPUTIME_ID clock prefer the main thread of a thread group for signal delivery. However, this has a significant downside: it requires waking up a potentially idle thread. Instead, prefer to deliver signals to the current thread (in the same thread group) if SIGEV_THREAD_ID is not set by the user. This does not change guaranteed semantics, since POSIX process CPU time timers have never guaranteed that signal delivery is to a specific thread (without SIGEV_THREAD_ID set). The effect is that we no longer wake up potentially idle threads, and the kernel is no longer biased towards delivering the timer signal to any particular thread (which better distributes the timer signals esp. when multiple timers fire concurrently). Signed-off-by: Dmitry Vyukov <dvyukov(a)google.com> Suggested-by: Oleg Nesterov <oleg(a)redhat.com> Reviewed-by: Oleg Nesterov <oleg(a)redhat.com> Signed-off-by: Marco Elver <elver(a)google.com> --- v6: - Split test from this patch. - Update wording on what this patch aims to improve. v5: - Rebased onto v6.2. v4: - Restructured checks in send_sigqueue() as suggested. v3: - Switched to the completely different implementation (much simpler) based on the Oleg's idea. RFC v2: - Added additional Cc as Thomas asked. --- kernel/signal.c | 25 ++++++++++++++++++++++--- 1 file changed, 22 insertions(+), 3 deletions(-) diff --git a/kernel/signal.c b/kernel/signal.c index 8cb28f1df294..605445fa27d4 100644 --- a/kernel/signal.c +++ b/kernel/signal.c @@ -1003,8 +1003,7 @@ static void complete_signal(int sig, struct task_struct *p, enum pid_type type) /* * Now find a thread we can wake up to take the signal off the queue. * - * If the main thread wants the signal, it gets first crack. - * Probably the least surprising to the average bear. + * Try the suggested task first (may or may not be the main thread). */ if (wants_signal(sig, p)) t = p; @@ -1970,8 +1969,23 @@ int send_sigqueue(struct sigqueue *q, struct pid *pid, enum pid_type type) ret = -1; rcu_read_lock(); + /* + * This function is used by POSIX timers to deliver a timer signal. + * Where type is PIDTYPE_PID (such as for timers with SIGEV_THREAD_ID + * set), the signal must be delivered to the specific thread (queues + * into t->pending). + * + * Where type is not PIDTYPE_PID, signals must just be delivered to the + * current process. In this case, prefer to deliver to current if it is + * in the same thread group as the target, as it avoids unnecessarily + * waking up a potentially idle task. + */ t = pid_task(pid, type); - if (!t || !likely(lock_task_sighand(t, &flags))) + if (!t) + goto ret; + if (type != PIDTYPE_PID && same_thread_group(t, current)) + t = current; + if (!likely(lock_task_sighand(t, &flags))) goto ret; ret = 1; /* the signal is ignored */ @@ -1993,6 +2007,11 @@ int send_sigqueue(struct sigqueue *q, struct pid *pid, enum pid_type type) q->info.si_overrun = 0; signalfd_notify(t, sig); + /* + * If the type is not PIDTYPE_PID, we just use shared_pending, which + * won't guarantee that the specified task will receive the signal, but + * is sufficient if t==current in the common case. + */ pending = (type != PIDTYPE_PID) ? &t->signal->shared_pending : &t->pending; list_add_tail(&q->list, &pending->list); sigaddset(&pending->signal, sig); -- 2.40.0.rc1.284.g88254d51c5-goog

1 month

9
50
0 0

[PATCH v3 0/7] Split a folio to any lower order folios

by Zi Yan

From: Zi Yan <ziy(a)nvidia.com> Hi all, File folio supports any order and people would like to support flexible orders for anonymous folio[1] too. Currently, split_huge_page() only splits a huge page to order-0 pages, but splitting to orders higher than 0 is also useful. This patchset adds support for splitting a huge page to any lower order pages and uses it during file folio truncate operations. The patchset is on top of mm-everything-2023-03-27-21-20. Changelog === Since v2 --- 1. Fixed an issue in __split_page_owner() introduced during my rebase Since v1 --- 1. Changed split_page_memcg() and split_page_owner() parameter to use order 2. Used folio_test_pmd_mappable() in place of the equivalent code Details === * Patch 1 changes split_page_memcg() to use order instead of nr_pages * Patch 2 changes split_page_owner() to use order instead of nr_pages * Patch 3 and 4 add new_order parameter split_page_memcg() and split_page_owner() and prepare for upcoming changes. * Patch 5 adds split_huge_page_to_list_to_order() to split a huge page to any lower order. The original split_huge_page_to_list() calls split_huge_page_to_list_to_order() with new_order = 0. * Patch 6 uses split_huge_page_to_list_to_order() in large pagecache folio truncation instead of split the large folio all the way down to order-0. * Patch 7 adds a test API to debugfs and test cases in split_huge_page_test selftests. Comments and/or suggestions are welcome. [1] https://lore.kernel.org/linux-mm/Y%2FblF0GIunm+pRIC@casper.infradead.org/ Zi Yan (7): mm/memcg: use order instead of nr in split_page_memcg() mm/page_owner: use order instead of nr in split_page_owner() mm: memcg: make memcg huge page split support any order split. mm: page_owner: add support for splitting to any order in split page_owner. mm: thp: split huge page to any lower order pages. mm: truncate: split huge page cache page to a non-zero order if possible. mm: huge_memory: enable debugfs to split huge pages to any order. include/linux/huge_mm.h | 10 +- include/linux/memcontrol.h | 4 +- include/linux/page_owner.h | 10 +- mm/huge_memory.c | 137 ++++++++--- mm/memcontrol.c | 10 +- mm/page_alloc.c | 8 +- mm/page_owner.c | 8 +- mm/truncate.c | 21 +- .../selftests/mm/split_huge_page_test.c | 225 +++++++++++++++++- 9 files changed, 365 insertions(+), 68 deletions(-) -- 2.39.2

3 months

6
22
0 0

[PATCH v3 00/11] A minor flurry of selftest/mm fixes

by John Hubbard

Hi, Changes since v2 [1]: * Added a new patch (sent separately earlier) at the end, to error out if "make headers" has not yet been run. * Reworked and simplified the uffd movement patch. Now it only moves some uffd*() routines, not all, and doesn't have to touch the Makefile at all. This lighter touch also allowed me to drop the "move psize(), pshift() into vm_utils.c" entirely. I expect Peter Xu will be a little happier with this new approach. * Fixed the commit description for the MADV_COLLAPSE patch. * Added more Reviewed-by tags from David Hildenbrand and Peter Xu. [1] https://lore.kernel.org/all/20230603021558.95299-1-jhubbard@nvidia.com/ John Hubbard (11): selftests/mm: fix uffd-stress unused function warning selftests/mm: fix unused variable warnings in hugetlb-madvise.c, migration.c selftests/mm: fix "warning: expression which evaluates to zero..." in mlock2-tests.c selftests/mm: fix invocation of tests that are run via shell scripts selftests/mm: .gitignore: add mkdirty, va_high_addr_switch selftests/mm: fix two -Wformat-security warnings in uffd builds selftests/mm: fix a "possibly uninitialized" warning in pkey-x86.h selftests/mm: fix build failures due to missing MADV_COLLAPSE selftests/mm: move certain uffd*() routines from vm_util.c to uffd-common.c Documentation: kselftest: "make headers" is a prerequisite selftests: error out if kernel header files are not yet built Documentation/dev-tools/kselftest.rst | 1 + tools/testing/selftests/lib.mk | 36 +++++++++++- tools/testing/selftests/mm/.gitignore | 2 + tools/testing/selftests/mm/cow.c | 7 --- tools/testing/selftests/mm/hugetlb-madvise.c | 8 ++- tools/testing/selftests/mm/khugepaged.c | 10 ---- tools/testing/selftests/mm/migration.c | 5 +- tools/testing/selftests/mm/mlock2-tests.c | 1 - tools/testing/selftests/mm/pkey-x86.h | 2 +- tools/testing/selftests/mm/run_vmtests.sh | 6 +- tools/testing/selftests/mm/uffd-common.c | 59 ++++++++++++++++++++ tools/testing/selftests/mm/uffd-common.h | 5 ++ tools/testing/selftests/mm/uffd-stress.c | 10 ---- tools/testing/selftests/mm/uffd-unit-tests.c | 16 ++---- tools/testing/selftests/mm/vm_util.c | 59 -------------------- tools/testing/selftests/mm/vm_util.h | 14 +++-- 16 files changed, 130 insertions(+), 111 deletions(-) base-commit: f8dba31b0a826e691949cd4fdfa5c30defaac8c5 -- 2.40.1

5 months, 1 week

6
38
0 0

[PATCH v1 0/9] x86/resctrl: Use soft RMIDs for reliable MBM on AMD

by Peter Newman

Hi Reinette, Fenghua, This series introduces a new mount option enabling an alternate mode for MBM to work around an issue on present AMD implementations and any other resctrl implementation where there are more RMIDs (or equivalent) than hardware counters. The L3 External Bandwidth Monitoring feature of the AMD PQoS extension[1] only guarantees that RMIDs currently assigned to a processor will be tracked by hardware. The counters of any other RMIDs which are no longer being tracked will be reset to zero. The MBM event counters return "Unavailable" to indicate when this has happened. An interval for effectively measuring memory bandwidth typically needs to be multiple seconds long. In Google's workloads, it is not feasible to bound the number of jobs with different RMIDs which will run in a cache domain over any period of time. Consequently, on a fully-committed system where all RMIDs are allocated, few groups' counters return non-zero values. To demonstrate the underlying issue, the first patch provides a test case in tools/testing/selftests/resctrl/test_rmids.sh. On an AMD EPYC 7B12 64-Core Processor with the default behavior: # ./test_rmids.sh Created 255 monitoring groups. g1: mbm_total_bytes: Unavailable -> Unavailable (FAIL) g2: mbm_total_bytes: Unavailable -> Unavailable (FAIL) g3: mbm_total_bytes: Unavailable -> Unavailable (FAIL) [..] g238: mbm_total_bytes: Unavailable -> Unavailable (FAIL) g239: mbm_total_bytes: Unavailable -> Unavailable (FAIL) g240: mbm_total_bytes: Unavailable -> Unavailable (FAIL) g241: mbm_total_bytes: Unavailable -> 660497472 g242: mbm_total_bytes: Unavailable -> 660793344 g243: mbm_total_bytes: Unavailable -> 660477312 g244: mbm_total_bytes: Unavailable -> 660495360 g245: mbm_total_bytes: Unavailable -> 660775360 g246: mbm_total_bytes: Unavailable -> 660645504 g247: mbm_total_bytes: Unavailable -> 660696128 g248: mbm_total_bytes: Unavailable -> 660605248 g249: mbm_total_bytes: Unavailable -> 660681280 g250: mbm_total_bytes: Unavailable -> 660834240 g251: mbm_total_bytes: Unavailable -> 660440064 g252: mbm_total_bytes: Unavailable -> 660501504 g253: mbm_total_bytes: Unavailable -> 660590720 g254: mbm_total_bytes: Unavailable -> 660548352 g255: mbm_total_bytes: Unavailable -> 660607296 255 groups, 0 returned counts in first pass, 15 in second successfully measured bandwidth from 15/255 groups To compare, here is the output from an Intel(R) Xeon(R) Platinum 8173M CPU: # ./test_rmids.sh Created 223 monitoring groups. g1: mbm_total_bytes: 0 -> 606126080 g2: mbm_total_bytes: 0 -> 613236736 g3: mbm_total_bytes: 0 -> 610254848 [..] g221: mbm_total_bytes: 0 -> 584679424 g222: mbm_total_bytes: 0 -> 588808192 g223: mbm_total_bytes: 0 -> 587317248 223 groups, 223 returned counts in first pass, 223 in second successfully measured bandwidth from 223/223 groups To make better use of the hardware in such a use case, this patchset introduces a "soft" RMID implementation, where each CPU is permanently assigned a "hard" RMID. On context switches which change the current soft RMID, the difference between each CPU's current event counts and most recent counts is added to the totals for the current or outgoing soft RMID. This technique does not work for cache occupancy counters, so this patch series disables cache occupancy events when soft RMIDs are enabled. This series adds the "mbm_soft_rmid" mount option to allow users to opt-in to the functionaltiy when they deem it helpful. When the same system from the earlier AMD example enables the mbm_soft_rmid mount option: # ./test_rmids.sh Created 255 monitoring groups. g1: mbm_total_bytes: 0 -> 686560576 g2: mbm_total_bytes: 0 -> 668204416 [..] g252: mbm_total_bytes: 0 -> 672651200 g253: mbm_total_bytes: 0 -> 666956800 g254: mbm_total_bytes: 0 -> 665917056 g255: mbm_total_bytes: 0 -> 671049600 255 groups, 255 returned counts in first pass, 255 in second successfully measured bandwidth from 255/255 groups (patches are based on tip/master) [1] https://www.amd.com/system/files/TechDocs/56375_1.03_PUB.pdf Peter Newman (8): selftests/resctrl: Verify all RMIDs count together x86/resctrl: Add resctrl_mbm_flush_cpu() to collect CPUs' MBM events x86/resctrl: Flush MBM event counts on soft RMID change x86/resctrl: Call mon_event_count() directly for soft RMIDs x86/resctrl: Create soft RMID version of __mon_event_count() x86/resctrl: Assign HW RMIDs to CPUs for soft RMID x86/resctrl: Use mbm_update() to push soft RMID counts x86/resctrl: Add mount option to enable soft RMID Stephane Eranian (1): x86/resctrl: Hold a spinlock in __rmid_read() on AMD arch/x86/include/asm/resctrl.h | 29 +++- arch/x86/kernel/cpu/resctrl/core.c | 80 ++++++++- arch/x86/kernel/cpu/resctrl/ctrlmondata.c | 9 +- arch/x86/kernel/cpu/resctrl/internal.h | 19 ++- arch/x86/kernel/cpu/resctrl/monitor.c | 158 +++++++++++++++++- arch/x86/kernel/cpu/resctrl/rdtgroup.c | 52 ++++++ tools/testing/selftests/resctrl/test_rmids.sh | 93 +++++++++++ 7 files changed, 425 insertions(+), 15 deletions(-) create mode 100755 tools/testing/selftests/resctrl/test_rmids.sh base-commit: dd806e2f030e57dd5bac973372aa252b6c175b73 -- 2.40.0.634.g4ca3ef3211-goog

5 months, 2 weeks

2
39
0 0

selftests: gpio: crash on arm64

by Naresh Kamboju

Following kernel warnings and crash notices on arm64 Rpi4 device while running selftests: gpio on Linux mainline 6.3.0-rc1 kernel and Linux next. Reported-by: Linux Kernel Functional Testing <lkft(a)linaro.org> Please refer to test log links for detailed test plan and kernel crash logs. It is reproducible on arm64 juno-r2, Rpi4 and Qualcomm dragonboard 410c and qemu-arm64. Test log: ----------- kselftest: Running tests in gpio TAP version 13 1..2 # selftests: gpio: gpio-mockup.sh # 1. Module load tests [ 61.176149] ============================================================================= [ 61.176802] [ 61.176807] ====================================================== [ 61.176809] WARNING: possible circular locking dependency detected [ 61.176811] 6.3.0-rc1-next-20230307 #1 Not tainted [ 61.176814] ------------------------------------------------------ [ 61.176816] modprobe/510 is trying to acquire lock: [ 61.176818] ffff80000b2284e8 (console_owner){..-.}-{0:0}, at: console_flush_all (kernel/printk/printk.c:2879 kernel/printk/printk.c:2942) [ 61.176846] [ 61.176846] but task is already holding lock: [ 61.176848] ffff000040000698 (&n->list_lock){-.-.}-{2:2}, at: get_partial_node.part.0 (mm/slub.c:2271) [ 61.176861] [ 61.176861] which lock already depends on the new lock. [ 61.176861] [ 61.176863] [ 61.176863] the existing dependency chain (in reverse order) is: [ 61.176864] [ 61.176864] -> #2 (&n->list_lock){-.-.}-{2:2}: [ 61.176871] lock_acquire (kernel/locking/lockdep.c:5673) [ 61.176879] _raw_spin_lock_irqsave (include/linux/spinlock_api_smp.h:111 kernel/locking/spinlock.c:162) [ 61.176885] get_partial_node.part.0 (mm/slub.c:2271) [ 61.176890] ___slab_alloc (mm/slub.c:2268 mm/slub.c:2386 mm/slub.c:3188) [ 61.176894] __slab_alloc.constprop.0 (mm/slub.c:3292) [ 61.176899] __kmem_cache_alloc_node (mm/slub.c:3345 mm/slub.c:3442 mm/slub.c:3491) [ 61.176903] __kmalloc (mm/slab_common.c:968 mm/slab_common.c:980) [ 61.176908] tty_buffer_alloc (drivers/tty/tty_buffer.c:182) [ 61.176914] __tty_buffer_request_room (drivers/tty/tty_buffer.c:279) [ 61.176919] __tty_insert_flip_char (drivers/tty/tty_buffer.c:398) [ 61.176924] uart_insert_char (drivers/tty/serial/serial_core.c:3341) [ 61.176929] pl011_fifo_to_tty.isra.0 (drivers/tty/serial/amba-pl011.c:314) [ 61.176934] pl011_int (include/linux/spinlock.h:390 drivers/tty/serial/amba-pl011.c:1396 drivers/tty/serial/amba-pl011.c:1571) [ 61.176937] __handle_irq_event_percpu (kernel/irq/handle.c:158) [ 61.176941] handle_irq_event (kernel/irq/handle.c:193 kernel/irq/handle.c:210) [ 61.176944] handle_fasteoi_irq (kernel/irq/chip.c:716) [ 61.176950] generic_handle_domain_irq (kernel/irq/irqdesc.c:652 kernel/irq/irqdesc.c:707) [ 61.176953] gic_handle_irq (arch/arm64/include/asm/io.h:75 include/asm-generic/io.h:335 drivers/irqchip/irq-gic.c:344) [ 61.176958] call_on_irq_stack (arch/arm64/kernel/entry.S:905) [ 61.176962] do_interrupt_handler (arch/arm64/kernel/entry-common.c:274) [ 61.176968] el1_interrupt (arch/arm64/kernel/entry-common.c:472 arch/arm64/kernel/entry-common.c:486) [ 61.176971] el1h_64_irq_handler (arch/arm64/kernel/entry-common.c:492) [ 61.176975] el1h_64_irq (arch/arm64/kernel/entry.S:587) [ 61.176978] __kmem_cache_alloc_node (mm/slub.c:3490) [ 61.176983] kmalloc_trace (mm/slab_common.c:1064 (discriminator 4)) [ 61.176986] inet6_dump_fib (net/ipv6/ip6_fib.c:657) [ 61.176991] rtnl_dump_all (net/core/rtnetlink.c:3964) [ 61.176997] netlink_dump (net/netlink/af_netlink.c:2296) [ 61.177004] netlink_recvmsg (net/netlink/af_netlink.c:2024) [ 61.177009] ____sys_recvmsg (net/socket.c:1015 net/socket.c:1036 net/socket.c:2723) [ 61.177014] ___sys_recvmsg (net/socket.c:2765) [ 61.177019] __sys_recvmsg (include/linux/file.h:31 net/socket.c:2797) [ 61.177025] __arm64_sys_recvmsg (net/socket.c:2802) [ 61.177030] invoke_syscall (arch/arm64/include/asm/current.h:19 arch/arm64/kernel/syscall.c:57) [ 61.177037] el0_svc_common.constprop.0 (arch/arm64/kernel/syscall.c:149) [ 61.177043] do_el0_svc (arch/arm64/kernel/syscall.c:194) [ 61.177049] el0_svc (arch/arm64/include/asm/daifflags.h:28 arch/arm64/kernel/entry-common.c:133 arch/arm64/kernel/entry-common.c:142 arch/arm64/kernel/entry-common.c:638) [ 61.177052] el0t_64_sync_handler (arch/arm64/kernel/entry-common.c:656) [ 61.177055] el0t_64_sync (arch/arm64/kernel/entry.S:591) [ 61.177058] [ 61.177058] -> #1 (&port_lock_key){-.-.}-{2:2}: [ 61.177065] lock_acquire (kernel/locking/lockdep.c:5673) [ 61.177071] _raw_spin_lock_irqsave (include/linux/spinlock_api_smp.h:111 kernel/locking/spinlock.c:162) [ 61.177074] serial8250_console_write (drivers/tty/serial/8250/8250_port.c:3394) [ 61.177082] univ8250_console_write (drivers/tty/serial/8250/8250_core.c:585) [ 61.177087] console_flush_all (kernel/printk/printk.c:2888 kernel/printk/printk.c:2942) [ 61.177093] console_unlock.part.0 (kernel/printk/printk.c:3017) [ 61.177098] vprintk_emit (kernel/printk/printk.c:2317) [ 61.177104] vprintk_default (kernel/printk/printk.c:2328) [ 61.177110] vprintk (kernel/printk/printk_safe.c:50) [ 61.177116] _printk (kernel/printk/printk.c:2341) [ 61.177121] register_console (kernel/printk/printk.c:3468) [ 61.177126] uart_add_one_port (drivers/tty/serial/serial_core.c:2579 drivers/tty/serial/serial_core.c:3100) [ 61.177130] serial8250_register_8250_port (drivers/tty/serial/8250/8250_core.c:1093) [ 61.177135] bcm2835aux_serial_probe (drivers/tty/serial/8250/8250_bcm2835aux.c:184) [ 61.177141] platform_probe (drivers/base/platform.c:1405) [ 61.177148] really_probe (drivers/base/dd.c:552 drivers/base/dd.c:631) [ 61.177152] __driver_probe_device (drivers/base/dd.c:768) [ 61.177157] driver_probe_device (drivers/base/dd.c:798) [ 61.177161] __driver_attach (drivers/base/dd.c:1185) [ 61.177166] bus_for_each_dev (drivers/base/bus.c:368) [ 61.177170] driver_attach (drivers/base/dd.c:1202) [ 61.177173] bus_add_driver (drivers/base/bus.c:673) [ 61.177177] driver_register (drivers/base/driver.c:246) [ 61.177182] __platform_driver_register (drivers/base/platform.c:868) [ 61.177188] bcm2835aux_serial_driver_init (drivers/tty/serial/8250/8250_bcm2835aux.c:233) [ 61.177195] do_one_initcall (init/main.c:1306) [ 61.177199] kernel_init_freeable (init/main.c:1378 init/main.c:1395 init/main.c:1414 init/main.c:1634) [ 61.177207] kernel_init (init/main.c:1524) [ 61.177212] ret_from_fork (arch/arm64/kernel/entry.S:871) [ 61.177216] [ 61.177216] -> #0 (console_owner){..-.}-{0:0}: [ 61.177222] __lock_acquire (kernel/locking/lockdep.c:3099 kernel/locking/lockdep.c:3217 kernel/locking/lockdep.c:3832 kernel/locking/lockdep.c:5056) [ 61.177228] lock_acquire.part.0 (arch/arm64/include/asm/percpu.h:40 kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5671) [ 61.177233] lock_acquire (kernel/locking/lockdep.c:5673) [ 61.177238] console_flush_all (kernel/printk/printk.c:2883 kernel/printk/printk.c:2942) [ 61.177244] console_unlock.part.0 (kernel/printk/printk.c:3017) [ 61.177250] vprintk_emit (kernel/printk/printk.c:2317) [ 61.177255] vprintk_default (kernel/printk/printk.c:2328) [ 61.177261] vprintk (kernel/printk/printk_safe.c:50) [ 61.177267] _printk (kernel/printk/printk.c:2341) [ 61.177271] slab_bug (mm/slub.c:892) [ 61.177274] check_bytes_and_report (mm/slub.c:1054) [ 61.177279] check_object (mm/slub.c:1196 (discriminator 2)) [ 61.177283] alloc_debug_processing (mm/slub.c:1415 mm/slub.c:1425) [ 61.177287] get_partial_node.part.0 (mm/slub.c:2146 mm/slub.c:2279) [ 61.177291] ___slab_alloc (mm/slub.c:2268 mm/slub.c:2386 mm/slub.c:3188) [ 61.177295] __slab_alloc.constprop.0 (mm/slub.c:3292) [ 61.177300] __kmem_cache_alloc_node (mm/slub.c:3345 mm/slub.c:3442 mm/slub.c:3491) [ 61.177304] kmalloc_trace (mm/slab_common.c:1064 (discriminator 4)) [ 61.177308] device_add (drivers/base/core.c:3436 drivers/base/core.c:3486) [ 61.177311] platform_device_add (drivers/base/platform.c:717) [ 61.177317] platform_device_register_full (drivers/base/platform.c:844) [ 61.177323] gpio_mockup_register_chip+0x1ec/0x2b8 gpio_mockup [ 61.177342] gpio_mockup_init+0xf0/0xd40 gpio_mockup [ 61.177352] do_one_initcall (init/main.c:1306) [ 61.177356] do_init_module (kernel/module/main.c:2457) [ 61.177363] load_module (kernel/module/main.c:2859) [ 61.177369] __do_sys_finit_module (kernel/module/main.c:2961) [ 61.177375] __arm64_sys_finit_module (kernel/module/main.c:2928) [ 61.177381] invoke_syscall (arch/arm64/include/asm/current.h:19 arch/arm64/kernel/syscall.c:57) [ 61.177387] el0_svc_common.constprop.0 (arch/arm64/kernel/syscall.c:149) [ 61.177393] do_el0_svc (arch/arm64/kernel/syscall.c:194) [ 61.177398] el0_svc (arch/arm64/include/asm/daifflags.h:28 arch/arm64/kernel/entry-common.c:133 arch/arm64/kernel/entry-common.c:142 arch/arm64/kernel/entry-common.c:638) [ 61.177402] el0t_64_sync_handler (arch/arm64/kernel/entry-common.c:656) [ 61.177405] el0t_64_sync (arch/arm64/kernel/entry.S:591) [ 61.177408] [ 61.177408] other info that might help us debug this: [ 61.177408] [ 61.177410] Chain exists of: [ 61.177410] console_owner --> &port_lock_key --> &n->list_lock [ 61.177410] [ 61.177417] Possible unsafe locking scenario: [ 61.177417] [ 61.177418] CPU0 CPU1 [ 61.177419] ---- ---- [ 61.177420] lock(&n->list_lock); [ 61.177423] lock(&port_lock_key); [ 61.177426] lock(&n->list_lock); [ 61.177429] lock(console_owner); [ 61.177432] [ 61.177432] *** DEADLOCK *** [ 61.177432] [ 61.177434] 3 locks held by modprobe/510: [ 61.177436] #0: ffff000040000698 (&n->list_lock){-.-.}-{2:2}, at: get_partial_node.part.0 (mm/slub.c:2271) [ 61.177448] #1: ffff80000b227f18 (console_lock){+.+.}-{0:0}, at: vprintk_emit (kernel/printk/printk.c:1936 kernel/printk/printk.c:2315) [ 61.177460] #2: ffff80000b228388 (console_srcu){....}-{0:0}, at: console_flush_all (include/linux/srcu.h:200 kernel/printk/printk.c:290 kernel/printk/printk.c:2934) [ 61.177471] [ 61.177471] stack backtrace: [ 61.177474] CPU: 3 PID: 510 Comm: modprobe Not tainted 6.3.0-rc1-next-20230307 #1 [ 61.177479] Hardware name: Raspberry Pi 4 Model B (DT) [ 61.177482] Call trace: [ 61.177483] dump_backtrace (arch/arm64/kernel/stacktrace.c:160) [ 61.177487] show_stack (arch/arm64/kernel/stacktrace.c:167) [ 61.177490] dump_stack_lvl (lib/dump_stack.c:107) [ 61.177498] dump_stack (lib/dump_stack.c:114) [ 61.177504] print_circular_bug (kernel/locking/lockdep.c:2057) [ 61.177509] check_noncircular (kernel/locking/lockdep.c:2181) [ 61.177514] __lock_acquire (kernel/locking/lockdep.c:3099 kernel/locking/lockdep.c:3217 kernel/locking/lockdep.c:3832 kernel/locking/lockdep.c:5056) [ 61.177520] lock_acquire.part.0 (arch/arm64/include/asm/percpu.h:40 kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5671) [ 61.177525] lock_acquire (kernel/locking/lockdep.c:5673) [ 61.177530] console_flush_all (kernel/printk/printk.c:2883 kernel/printk/printk.c:2942) [ 61.177536] console_unlock.part.0 (kernel/printk/printk.c:3017) [ 61.177542] vprintk_emit (kernel/printk/printk.c:2317) [ 61.177547] vprintk_default (kernel/printk/printk.c:2328) [ 61.177553] vprintk (kernel/printk/printk_safe.c:50) [ 61.177559] _printk (kernel/printk/printk.c:2341) [ 61.177564] slab_bug (mm/slub.c:892) [ 61.177567] check_bytes_and_report (mm/slub.c:1054) [ 61.177571] check_object (mm/slub.c:1196 (discriminator 2)) [ 61.177575] alloc_debug_processing (mm/slub.c:1415 mm/slub.c:1425) [ 61.177579] get_partial_node.part.0 (mm/slub.c:2146 mm/slub.c:2279) [ 61.177583] ___slab_alloc (mm/slub.c:2268 mm/slub.c:2386 mm/slub.c:3188) [ 61.177587] __slab_alloc.constprop.0 (mm/slub.c:3292) [ 61.177592] __kmem_cache_alloc_node (mm/slub.c:3345 mm/slub.c:3442 mm/slub.c:3491) [ 61.177596] kmalloc_trace (mm/slab_common.c:1064 (discriminator 4)) [ 61.177600] device_add (drivers/base/core.c:3436 drivers/base/core.c:3486) [ 61.177603] platform_device_add (drivers/base/platform.c:717) [ 61.177609] platform_device_register_full (drivers/base/platform.c:844) [ 61.177615] gpio_mockup_register_chip+0x1ec/0x2b8 gpio_mockup [ 61.177625] gpio_mockup_init+0xf0/0xd40 gpio_mockup [ 61.177634] do_one_initcall (init/main.c:1306) [ 61.177638] do_init_module (kernel/module/main.c:2457) [ 61.177644] load_module (kernel/module/main.c:2859) [ 61.177650] __do_sys_finit_module (kernel/module/main.c:2961) [ 61.177656] __arm64_sys_finit_module (kernel/module/main.c:2928) [ 61.177662] invoke_syscall (arch/arm64/include/asm/current.h:19 arch/arm64/kernel/syscall.c:57) [ 61.177668] el0_svc_common.constprop.0 (arch/arm64/kernel/syscall.c:149) [ 61.177674] do_el0_svc (arch/arm64/kernel/syscall.c:194) [ 61.177680] el0_svc (arch/arm64/include/asm/daifflags.h:28 arch/arm64/kernel/entry-common.c:133 arch/arm64/kernel/entry-common.c:142 arch/arm64/kernel/entry-common.c:638) [ 61.177683] el0t_64_sync_handler (arch/arm64/kernel/entry-common.c:656) [ 61.177686] el0t_64_sync (arch/arm64/kernel/entry.S:591) [ 62.011685] BUG kmalloc-512 (Not tainted): Poison overwritten [ 62.017513] ----------------------------------------------------------------------------- [ 62.017513] [ 62.027300] 0xffff00004ecb7a38-0xffff00004ecb7a47 @offset=31288. First byte 0x6a instead of 0x6b [ 62.036210] Allocated in swnode_register+0x40/0x218 age=808 cpu=3 pid=386 [ 62.043101] __kmem_cache_alloc_node (mm/slub.c:3345 mm/slub.c:3442 mm/slub.c:3491) [ 62.047784] kmalloc_trace (mm/slab_common.c:1064 (discriminator 4)) [ 62.051406] swnode_register (drivers/base/swnode.c:776) [ 62.055293] fwnode_create_software_node (drivers/base/swnode.c:934 (discriminator 4)) [ 62.060238] gpio_mockup_register_chip+0x1c4/0x2b8 gpio_mockup [ 62.066337] gpio_mockup_init+0xf0/0xd40 gpio_mockup [ 62.071551] do_one_initcall (init/main.c:1306) [ 62.075437] do_init_module (kernel/module/main.c:2457) [ 62.079238] load_module (kernel/module/main.c:2859) [ 62.083037] __do_sys_finit_module (kernel/module/main.c:2961) [ 62.087455] __arm64_sys_finit_module (kernel/module/main.c:2928) [ 62.092048] invoke_syscall (arch/arm64/include/asm/current.h:19 arch/arm64/kernel/syscall.c:57) [ 62.095848] el0_svc_common.constprop.0 (arch/arm64/kernel/syscall.c:149) [ 62.100793] do_el0_svc (arch/arm64/kernel/syscall.c:194) [ 62.104151] el0_svc (arch/arm64/include/asm/daifflags.h:28 arch/arm64/kernel/entry-common.c:133 arch/arm64/kernel/entry-common.c:142 arch/arm64/kernel/entry-common.c:638) [ 62.107244] el0t_64_sync_handler (arch/arm64/kernel/entry-common.c:656) [ 62.111570] Freed in software_node_release+0xdc/0x108 age=632 cpu=0 pid=428 [ 62.118633] __kmem_cache_free (mm/slub.c:3732 mm/slub.c:3788 mm/slub.c:3800) [ 62.122784] kfree (mm/slab_common.c:1020) [ 62.125788] software_node_release (drivers/base/swnode.c:761) [ 62.130204] kobject_put (lib/kobject.c:685 lib/kobject.c:712 include/linux/kref.h:65 lib/kobject.c:729) [ 62.133739] software_node_notify_remove (drivers/base/swnode.c:1093) [ 62.138597] device_del (drivers/base/core.c:2265 drivers/base/core.c:3778) [ 62.142134] platform_device_del.part.0 (drivers/base/platform.c:753) [ 62.146903] platform_device_unregister (drivers/base/platform.c:551 drivers/base/platform.c:794) [ 62.151672] gpio_mockup_exit+0x54/0x280 gpio_mockup [ 62.156888] __arm64_sys_delete_module (kernel/module/main.c:756 kernel/module/main.c:698 kernel/module/main.c:698) [ 62.161745] invoke_syscall (arch/arm64/include/asm/current.h:19 arch/arm64/kernel/syscall.c:57) [ 62.165545] el0_svc_common.constprop.0 (arch/arm64/kernel/syscall.c:149) [ 62.170490] do_el0_svc (arch/arm64/kernel/syscall.c:194) [ 62.173850] el0_svc (arch/arm64/include/asm/daifflags.h:28 arch/arm64/kernel/entry-common.c:133 arch/arm64/kernel/entry-common.c:142 arch/arm64/kernel/entry-common.c:638) [ 62.176941] el0t_64_sync_handler (arch/arm64/kernel/entry-common.c:656) [ 62.181267] el0t_64_sync (arch/arm64/kernel/entry.S:591) [ 62.184975] Slab 0xfffffc00013b2c00 objects=21 used=7 fp=0xffff00004ecb7400 flags=0x7fffc0000010200(slab|head|node=0|zone=1|lastcpupid=0xffff) [ 62.197943] Object 0xffff00004ecb7a00 @offset=31232 fp=0xffff00004ecb7400 [ 62.197943] [ 62.206325] Redzone ffff00004ecb7800: ... [ 63.089597] CPU: 3 PID: 510 Comm: modprobe Not tainted 6.3.0-rc1-next-20230307 #1 [ 63.097186] Hardware name: Raspberry Pi 4 Model B (DT) [ 63.102392] Call trace: [ 63.104865] dump_backtrace (arch/arm64/kernel/stacktrace.c:160) [ 63.108665] show_stack (arch/arm64/kernel/stacktrace.c:167) [ 63.112021] dump_stack_lvl (lib/dump_stack.c:107) [ 63.115734] dump_stack (lib/dump_stack.c:114) [ 63.119093] print_trailer (mm/slub.c:953) [ 63.122892] check_bytes_and_report (mm/slub.c:1058) [ 63.127395] check_object (mm/slub.c:1196 (discriminator 2)) [ 63.131104] alloc_debug_processing (mm/slub.c:1415 mm/slub.c:1425) [ 63.135606] get_partial_node.part.0 (mm/slub.c:2146 mm/slub.c:2279) [ 63.140286] ___slab_alloc (mm/slub.c:2268 mm/slub.c:2386 mm/slub.c:3188) [ 63.144084] __slab_alloc.constprop.0 (mm/slub.c:3292) [ 63.148674] __kmem_cache_alloc_node (mm/slub.c:3345 mm/slub.c:3442 mm/slub.c:3491) [ 63.153354] kmalloc_trace (mm/slab_common.c:1064 (discriminator 4)) [ 63.156974] device_add (drivers/base/core.c:3436 drivers/base/core.c:3486) [ 63.160508] platform_device_add (drivers/base/platform.c:717) [ 63.164837] platform_device_register_full (drivers/base/platform.c:844) [ 63.169959] gpio_mockup_register_chip+0x1ec/0x2b8 gpio_mockup [ 63.176057] gpio_mockup_init+0xf0/0xd40 gpio_mockup [ 63.181269] do_one_initcall (init/main.c:1306) [ 63.185155] do_init_module (kernel/module/main.c:2457) [ 63.188956] load_module (kernel/module/main.c:2859) [ 63.192755] __do_sys_finit_module (kernel/module/main.c:2961) [ 63.197171] __arm64_sys_finit_module (kernel/module/main.c:2928) [ 63.201765] invoke_syscall (arch/arm64/include/asm/current.h:19 arch/arm64/kernel/syscall.c:57) [ 63.205565] el0_svc_common.constprop.0 (arch/arm64/kernel/syscall.c:149) [ 63.210510] do_el0_svc (arch/arm64/kernel/syscall.c:194) [ 63.213869] el0_svc (arch/arm64/include/asm/daifflags.h:28 arch/arm64/kernel/entry-common.c:133 arch/arm64/kernel/entry-common.c:142 arch/arm64/kernel/entry-common.c:638) [ 63.216961] el0t_64_sync_handler (arch/arm64/kernel/entry-common.c:656) [ 63.221287] el0t_64_sync (arch/arm64/kernel/entry.S:591) [ 63.224998] FIX kmalloc-512: Restoring Poison 0xffff00004ecb7a38-0xffff00004ecb7a47=0x6b [ 63.233202] FIX kmalloc-512: Marking all objects used [ 63.399213] ============================================================================= links to the crash: - https://lkft.validation.linaro.org/scheduler/job/6224830#L1291 - https://lkft.validation.linaro.org/scheduler/job/6224742#L1202 - https://lkft.validation.linaro.org/scheduler/job/6224784#L3415 - https://lkft.validation.linaro.org/scheduler/job/6224810#L2029 metadata: git_ref: master git_repo: https://gitlab.com/Linaro/lkft/mirrors/next/linux-next git_sha: 709c6adf19dc558e44ab5c01659b09a16a2d3c82 git_describe: next-20230307 kernel_version: 6.3.0-rc1 kernel-config: https://storage.tuxsuite.com/public/linaro/lkft/builds/2MfXESbRAbSUj9oic6d8… build-url: https://gitlab.com/Linaro/lkft/mirrors/next/linux-next/-/pipelines/798095907 artifact-location: https://storage.tuxsuite.com/public/linaro/lkft/builds/2MfXESbRAbSUj9oic6d8… toolchain: gcc-11 -- Linaro LKFT https://lkft.linaro.org

6 months

5
8
0 0

[PATCH v6] selftests/clone3: Fix broken test under !CONFIG_TIME_NS

by Tiezhu Yang

When execute the following command to test clone3 under !CONFIG_TIME_NS: # make headers && cd tools/testing/selftests/clone3 && make && ./clone3 we can see the following error info: # [7538] Trying clone3() with flags 0x80 (size 0) # Invalid argument - Failed to create new process # [7538] clone3() with flags says: -22 expected 0 not ok 18 [7538] Result (-22) is different than expected (0) ... # Totals: pass:18 fail:1 xfail:0 xpass:0 skip:0 error:0 This is because if CONFIG_TIME_NS is not set, but the flag CLONE_NEWTIME (0x80) is used to clone a time namespace, it will return -EINVAL in copy_time_ns(). If kernel does not support CONFIG_TIME_NS, /proc/self/ns/time will be not exist, and then we should skip clone3() test with CLONE_NEWTIME. With this patch under !CONFIG_TIME_NS: # make headers && cd tools/testing/selftests/clone3 && make && ./clone3 ... # Time namespaces are not supported ok 18 # SKIP Skipping clone3() with CLONE_NEWTIME ... # Totals: pass:18 fail:0 xfail:0 xpass:0 skip:1 error:0 Fixes: 515bddf0ec41 ("selftests/clone3: test clone3 with CLONE_NEWTIME") Suggested-by: Thomas Gleixner <tglx(a)linutronix.de> Signed-off-by: Tiezhu Yang <yangtiezhu(a)loongson.cn> --- v6: Rebase on 6.5-rc1 and update the commit message tools/testing/selftests/clone3/clone3.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/tools/testing/selftests/clone3/clone3.c b/tools/testing/selftests/clone3/clone3.c index e60cf4d..1c61e3c 100644 --- a/tools/testing/selftests/clone3/clone3.c +++ b/tools/testing/selftests/clone3/clone3.c @@ -196,7 +196,12 @@ int main(int argc, char *argv[]) CLONE3_ARGS_NO_TEST); /* Do a clone3() in a new time namespace */ - test_clone3(CLONE_NEWTIME, 0, 0, CLONE3_ARGS_NO_TEST); + if (access("/proc/self/ns/time", F_OK) == 0) { + test_clone3(CLONE_NEWTIME, 0, 0, CLONE3_ARGS_NO_TEST); + } else { + ksft_print_msg("Time namespaces are not supported\n"); + ksft_test_result_skip("Skipping clone3() with CLONE_NEWTIME\n"); + } /* Do a clone3() with exit signal (SIGCHLD) in flags */ test_clone3(SIGCHLD, 0, -EINVAL, CLONE3_ARGS_NO_TEST); -- 2.1.0

7 months, 1 week

1
2
0 0

[PATCH v2 0/2] Modify vDSO selftests

by Tiezhu Yang

v2: Rebase on 6.5-rc1 and update the commit message Tiezhu Yang (2): selftests/vDSO: Add support for LoongArch selftests/vDSO: Get version and name for all archs tools/testing/selftests/vDSO/vdso_config.h | 6 ++++- tools/testing/selftests/vDSO/vdso_test_getcpu.c | 16 +++++-------- .../selftests/vDSO/vdso_test_gettimeofday.c | 26 ++++++---------------- 3 files changed, 18 insertions(+), 30 deletions(-) -- 2.1.0

7 months, 1 week

1
4
0 0

[RFC PATCH v2 00/20] context_tracking,x86: Defer some IPIs until a user->kernel transition

by Valentin Schneider

Context ======= We've observed within Red Hat that isolated, NOHZ_FULL CPUs running a pure-userspace application get regularly interrupted by IPIs sent from housekeeping CPUs. Those IPIs are caused by activity on the housekeeping CPUs leading to various on_each_cpu() calls, e.g.: 64359.052209596 NetworkManager 0 1405 smp_call_function_many_cond (cpu=0, func=do_kernel_range_flush) smp_call_function_many_cond+0x1 smp_call_function+0x39 on_each_cpu+0x2a flush_tlb_kernel_range+0x7b __purge_vmap_area_lazy+0x70 _vm_unmap_aliases.part.42+0xdf change_page_attr_set_clr+0x16a set_memory_ro+0x26 bpf_int_jit_compile+0x2f9 bpf_prog_select_runtime+0xc6 bpf_prepare_filter+0x523 sk_attach_filter+0x13 sock_setsockopt+0x92c __sys_setsockopt+0x16a __x64_sys_setsockopt+0x20 do_syscall_64+0x87 entry_SYSCALL_64_after_hwframe+0x65 The heart of this series is the thought that while we cannot remove NOHZ_FULL CPUs from the list of CPUs targeted by these IPIs, they may not have to execute the callbacks immediately. Anything that only affects kernelspace can wait until the next user->kernel transition, providing it can be executed "early enough" in the entry code. The original implementation is from Peter [1]. Nicolas then added kernel TLB invalidation deferral to that [2], and I picked it up from there. Deferral approach ================= Storing each and every callback, like a secondary call_single_queue turned out to be a no-go: the whole point of deferral is to keep NOHZ_FULL CPUs in userspace for as long as possible - no signal of any form would be sent when deferring an IPI. This means that any form of queuing for deferred callbacks would end up as a convoluted memory leak. Deferred IPIs must thus be coalesced, which this series achieves by assigning IPIs a "type" and having a mapping of IPI type to callback, leveraged upon kernel entry. What about IPIs whose callback take a parameter, you may ask? Peter suggested during OSPM23 [3] that since on_each_cpu() targets housekeeping CPUs *and* isolated CPUs, isolated CPUs can access either global or housekeeping-CPU-local state to "reconstruct" the data that would have been sent via the IPI. This series does not affect any IPI callback that requires an argument, but the approach would remain the same (one coalescable callback executed on kernel entry). Kernel entry vs execution of the deferred operation =================================================== There is a non-zero length of code that is executed upon kernel entry before the deferred operation can be itself executed (i.e. before we start getting into context_tracking.c proper). This means one must take extra care to what can happen in the early entry code, and that <bad things> cannot happen. For instance, we really don't want to hit instructions that have been modified by a remote text_poke() while we're on our way to execute a deferred sync_core(). Patches ======= o Patches 1-9 have been submitted separately and are included for the sake of testing o Patches 10-14 focus on having objtool detect problematic static key usage in early entry o Patch 15 adds the infrastructure for IPI deferral. o Patches 16-17 add some RCU testing infrastructure o Patch 18 adds text_poke() IPI deferral. o Patches 19-20 add vunmap() flush_tlb_kernel_range() IPI deferral These ones I'm a lot less confident about, mostly due to lacking instrumentation/verification. The actual deferred callback is also incomplete as it's not properly noinstr: vmlinux.o: warning: objtool: __flush_tlb_all_noinstr+0x19: call to native_write_cr4() leaves .noinstr.text section and it doesn't support PARAVIRT - it's going to need a pv_ops.mmu entry, but I have *no idea* what a sane implementation would be for Xen so I haven't touched that yet. Patches are also available at: https://gitlab.com/vschneid/linux.git -b redhat/isolirq/defer/v2 Testing ======= Note: this is a different machine than used for v1, because that machine decided to act difficult. Xeon E5-2699 system with SMToff, NOHZ_FULL, isolated CPUs. RHEL9 userspace. Workload is using rteval (kernel compilation + hackbench) on housekeeping CPUs and a dummy stay-in-userspace loop on the isolated CPUs. The main invocation is: $ trace-cmd record -e "csd_queue_cpu" -f "cpu & CPUS{$ISOL_CPUS}" \ -e "ipi_send_cpumask" -f "cpumask & CPUS{$ISOL_CPUS}" \ -e "ipi_send_cpu" -f "cpu & CPUS{$ISOL_CPUS}" \ rteval --onlyload --loads-cpulist=$HK_CPUS \ --hackbench-runlowmem=True --duration=$DURATION This only records IPIs sent to isolated CPUs, so any event there is interference (with a bit of fuzz at the start/end of the workload when spawning the processes). All tests were done with a duration of 30 minutes. v6.5-rc1 (+ cpumask filtering patches): # This is the actual IPI count $ trace-cmd report | grep callback | awk '{ print $(NF) }' | sort | uniq -c | sort -nr 338 callback=generic_smp_call_function_single_interrupt+0x0 # These are the different CSD's that caused IPIs $ trace-cmd report | grep csd_queue | awk '{ print $(NF-1) }' | sort | uniq -c | sort -nr 9207 func=do_flush_tlb_all 1116 func=do_sync_core 62 func=do_kernel_range_flush 3 func=nohz_full_kick_func v6.5-rc1 + patches: # This is the actual IPI count $ trace-cmd report | grep callback | awk '{ print $(NF) }' | sort | uniq -c | sort -nr 2 callback=generic_smp_call_function_single_interrupt+0x0 # These are the different CSD's that caused IPIs $ trace-cmd report | grep csd_queue | awk '{ print $(NF-1) }' | sort | uniq -c | sort -nr 2 func=nohz_full_kick_func The incriminating IPIs are all gone, but note that on the machine I used to test v1 there were still some do_flush_tlb_all() IPIs caused by pcpu_balance_workfn(), since only vmalloc is affected by the deferral mechanism. Acknowledgements ================ Special thanks to: o Clark Williams for listening to my ramblings about this and throwing ideas my way o Josh Poimboeuf for his guidance regarding objtool and hinting at the .data..ro_after_init section. Links ===== [1]: https://lore.kernel.org/all/20210929151723.162004989@infradead.org/ [2]: https://github.com/vianpl/linux.git -b ct-work-defer-wip [3]: https://youtu.be/0vjE6fjoVVE Revisions ========= RFCv1 -> RFCv2 ++++++++++++++ o Rebased onto v6.5-rc1 o Updated the trace filter patches (Steven) o Fixed __ro_after_init keys used in modules (Peter) o Dropped the extra context_tracking atomic, squashed the new bits in the existing .state field (Peter, Frederic) o Added an RCU_EXPERT config for the RCU dynticks counter size, and added an rcutorture case for a low-size counter (Paul) The new TREE11 case with a 2-bit dynticks counter seems to pass when ran against this series. o Fixed flush_tlb_kernel_range_deferrable() definition Peter Zijlstra (1): jump_label,module: Don't alloc static_key_mod for __ro_after_init keys Valentin Schneider (19): tracing/filters: Dynamically allocate filter_pred.regex tracing/filters: Enable filtering a cpumask field by another cpumask tracing/filters: Enable filtering a scalar field by a cpumask tracing/filters: Enable filtering the CPU common field by a cpumask tracing/filters: Optimise cpumask vs cpumask filtering when user mask is a single CPU tracing/filters: Optimise scalar vs cpumask filtering when the user mask is a single CPU tracing/filters: Optimise CPU vs cpumask filtering when the user mask is a single CPU tracing/filters: Further optimise scalar vs cpumask comparison tracing/filters: Document cpumask filtering objtool: Flesh out warning related to pv_ops[] calls objtool: Warn about non __ro_after_init static key usage in .noinstr context_tracking: Make context_tracking_key __ro_after_init x86/kvm: Make kvm_async_pf_enabled __ro_after_init context-tracking: Introduce work deferral infrastructure rcu: Make RCU dynticks counter size configurable rcutorture: Add a test config to torture test low RCU_DYNTICKS width context_tracking,x86: Defer kernel text patching IPIs context_tracking,x86: Add infrastructure to defer kernel TLBI x86/mm, mm/vmalloc: Defer flush_tlb_kernel_range() targeting NOHZ_FULL CPUs Documentation/trace/events.rst | 14 + arch/Kconfig | 9 + arch/x86/Kconfig | 1 + arch/x86/include/asm/context_tracking_work.h | 20 ++ arch/x86/include/asm/text-patching.h | 1 + arch/x86/include/asm/tlbflush.h | 2 + arch/x86/kernel/alternative.c | 24 +- arch/x86/kernel/kprobes/core.c | 4 +- arch/x86/kernel/kprobes/opt.c | 4 +- arch/x86/kernel/kvm.c | 2 +- arch/x86/kernel/module.c | 2 +- arch/x86/mm/tlb.c | 40 ++- include/asm-generic/sections.h | 5 + include/linux/context_tracking.h | 26 ++ include/linux/context_tracking_state.h | 65 +++- include/linux/context_tracking_work.h | 28 ++ include/linux/jump_label.h | 1 + include/linux/trace_events.h | 1 + init/main.c | 1 + kernel/context_tracking.c | 53 ++- kernel/jump_label.c | 49 +++ kernel/rcu/Kconfig | 33 ++ kernel/time/Kconfig | 5 + kernel/trace/trace_events_filter.c | 302 ++++++++++++++++-- mm/vmalloc.c | 19 +- tools/objtool/check.c | 22 +- tools/objtool/include/objtool/check.h | 1 + tools/objtool/include/objtool/special.h | 2 + tools/objtool/special.c | 3 + .../selftests/rcutorture/configs/rcu/TREE11 | 19 ++ .../rcutorture/configs/rcu/TREE11.boot | 1 + 31 files changed, 695 insertions(+), 64 deletions(-) create mode 100644 arch/x86/include/asm/context_tracking_work.h create mode 100644 include/linux/context_tracking_work.h create mode 100644 tools/testing/selftests/rcutorture/configs/rcu/TREE11 create mode 100644 tools/testing/selftests/rcutorture/configs/rcu/TREE11.boot -- 2.31.1

7 months, 1 week

12
75
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Linux-kselftest-mirror July 2023