Regressions noticed on arm64 devices while running LTP syscalls mmap16 test case on the Linux next-20250616..next-20250626 with the extra build config fragment CONFIG_ARM64_64K_PAGES=y the kernel warning noticed.
Not reproducible with 4K page size.
Test environments: - Dragonboard-410c - Juno-r2 - rk3399-rock-pi-4b - qemu-arm64
Regression Analysis: - New regression? Yes - Reproducibility? Yes
Test regression: next-20250626 LTP mmap16 WARNING fs jbd2 transaction.c start_this_handle
Reported-by: Linux Kernel Functional Testing lkft@linaro.org
## Test log <6>[ 89.498969] loop0: detected capacity change from 0 to 614400 <3>[ 89.609561] operation not supported error, dev loop0, sector 20352 op 0x9:(WRITE_ZEROES) flags 0x20000800 phys_seg 0 prio class 0 <6>[ 89.707795] EXT4-fs (loop0): mounted filesystem 6786a191-5e0d-472b-8bce-4714e1a4fb44 r/w with ordered data mode. Quota mode: none. <3>[ 90.023985] JBD2: kworker/u8:2 wants too many credits credits:416 rsv_credits:21 max:334 <4>[ 90.024973] ------------[ cut here ]------------ <4>[ 90.025062] WARNING: fs/jbd2/transaction.c:334 at start_this_handle+0x4c0/0x4e0, CPU#0: 2/42 <4>[ 90.026661] Modules linked in: btrfs blake2b_generic xor xor_neon raid6_pq zstd_compress sm3_ce sha3_ce fuse drm backlight ip_tables x_tables <4>[ 90.027952] CPU: 0 UID: 0 PID: 42 Comm: kworker/u8:2 Not tainted 6.16.0-rc3-next-20250626 #1 PREEMPT <4>[ 90.029043] Hardware name: linux,dummy-virt (DT) <4>[ 90.029524] Workqueue: writeback wb_workfn (flush-7:0) <4>[ 90.030050] pstate: 63402009 (nZCv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--) <4>[ 90.030311] pc : start_this_handle (fs/jbd2/transaction.c:334 (discriminator 1)) <4>[ 90.030481] lr : start_this_handle (fs/jbd2/transaction.c:334 (discriminator 1)) <4>[ 90.030656] sp : ffffc000805cb650 <4>[ 90.030785] x29: ffffc000805cb690 x28: fff00000dd1f5000 x27: ffffde2ec0272000 <4>[ 90.031097] x26: 00000000000001a0 x25: 0000000000000015 x24: 0000000000000002 <4>[ 90.031360] x23: 0000000000000015 x22: 0000000000000c40 x21: 0000000000000008 <4>[ 90.031618] x20: fff00000c231da78 x19: fff00000c231da78 x18: 0000000000000000 <4>[ 90.031875] x17: 0000000000000000 x16: 0000000000000000 x15: 0000000000000000 <4>[ 90.032859] x14: 0000000000000000 x13: 00000000ffffffff x12: 0000000000000000 <4>[ 90.033225] x11: 0000000000000000 x10: ffffde2ebfba8bd0 x9 : ffffde2ebd34e944 <4>[ 90.033607] x8 : ffffc000805cb278 x7 : 0000000000000000 x6 : 0000000000000001 <4>[ 90.033971] x5 : ffffde2ebfb29000 x4 : ffffde2ebfb293d0 x3 : 0000000000000000 <4>[ 90.034294] x2 : 0000000000000000 x1 : fff00000c04dc080 x0 : 000000000000004c <4>[ 90.034772] Call trace: <4>[ 90.035068] start_this_handle (fs/jbd2/transaction.c:334 (discriminator 1)) (P) <4>[ 90.035366] jbd2__journal_start (fs/jbd2/transaction.c:501) <4>[ 90.035586] __ext4_journal_start_sb (fs/ext4/ext4_jbd2.c:117) <4>[ 90.035807] ext4_do_writepages (fs/ext4/ext4_jbd2.h:242 fs/ext4/inode.c:2846) <4>[ 90.036004] ext4_writepages (fs/ext4/inode.c:2953) <4>[ 90.036233] do_writepages (mm/page-writeback.c:2636) <4>[ 90.036406] __writeback_single_inode (fs/fs-writeback.c:1680) <4>[ 90.036616] writeback_sb_inodes (fs/fs-writeback.c:1978) <4>[ 90.036891] wb_writeback (fs/fs-writeback.c:2156) <4>[ 90.037122] wb_workfn (fs/fs-writeback.c:2303 (discriminator 1) fs/fs-writeback.c:2343 (discriminator 1)) <4>[ 90.037318] process_one_work (kernel/workqueue.c:3244) <4>[ 90.037517] worker_thread (kernel/workqueue.c:3316 (discriminator 2) kernel/workqueue.c:3403 (discriminator 2)) <4>[ 90.037752] kthread (kernel/kthread.c:463) <4>[ 90.037903] ret_from_fork (arch/arm64/kernel/entry.S:863) <4>[ 90.038217] ---[ end trace 0000000000000000 ]--- <2>[ 90.039950] EXT4-fs (loop0): ext4_do_writepages: jbd2_start: 9223372036854775807 pages, ino 14; err -28 <3>[ 90.040291] JBD2: kworker/u8:2 wants too many credits credits:416 rsv_credits:21 max:334 <4>[ 90.040374] ------------[ cut here ]------------ <4>[ 90.040386] WARNING: fs/jbd2/transaction.c:334 at start_this_handle+0x4c0/0x4e0, CPU#1: 2/42
## Source * Kernel version: 6.16.0-rc3-next-20250626 * Git tree: https://kernel.googlesource.com/pub/scm/linux/kernel/git/next/linux-next.git * Git sha: ecb259c4f70dd5c83907809f45bf4dc6869961d7 * Git describe: 6.16.0-rc3-next-20250626 * Project details: https://qa-reports.linaro.org/lkft/linux-next-master/build/next-20250626/ * Architectures: arm64 * Toolchains: gcc-13 * Kconfigs: gcc-13-lkftconfig-64k_page_size
## Build arm64 * Test log: https://qa-reports.linaro.org/api/testruns/28894530/log_file/ * Test LAVA log 1: https://lkft.validation.linaro.org/scheduler/job/8331353#L6841 * Test LAVA log 2: https://lkft.validation.linaro.org/scheduler/job/8331352#L8854 * Test details: https://regressions.linaro.org/lkft/linux-next-master/next-20250626/log-pars... * Build link: https://storage.tuxsuite.com/public/linaro/lkft/builds/2z2V7LhiJecGzINkU7ObV... * Kernel config: https://storage.tuxsuite.com/public/linaro/lkft/builds/2z2V7LhiJecGzINkU7ObV...
-- Linaro LKFT https://lkft.linaro.org
Hi, Naresh!
On 2025/6/26 20:31, Naresh Kamboju wrote:
Regressions noticed on arm64 devices while running LTP syscalls mmap16 test case on the Linux next-20250616..next-20250626 with the extra build config fragment CONFIG_ARM64_64K_PAGES=y the kernel warning noticed.
Not reproducible with 4K page size.
Test environments:
- Dragonboard-410c
- Juno-r2
- rk3399-rock-pi-4b
- qemu-arm64
Regression Analysis:
- New regression? Yes
- Reproducibility? Yes
Test regression: next-20250626 LTP mmap16 WARNING fs jbd2 transaction.c start_this_handle
Reported-by: Linux Kernel Functional Testing lkft@linaro.org
Thank you for the report. The block size for this test is 1 KB, so I suspect this is the issue with insufficient journal credits that we are going to resolve.
https://lore.kernel.org/linux-ext4/20250611111625.1668035-1-yi.zhang@huaweic...
Thanks, Yi.
## Test log <6>[ 89.498969] loop0: detected capacity change from 0 to 614400 <3>[ 89.609561] operation not supported error, dev loop0, sector 20352 op 0x9:(WRITE_ZEROES) flags 0x20000800 phys_seg 0 prio class 0 <6>[ 89.707795] EXT4-fs (loop0): mounted filesystem 6786a191-5e0d-472b-8bce-4714e1a4fb44 r/w with ordered data mode. Quota mode: none. <3>[ 90.023985] JBD2: kworker/u8:2 wants too many credits credits:416 rsv_credits:21 max:334 <4>[ 90.024973] ------------[ cut here ]------------ <4>[ 90.025062] WARNING: fs/jbd2/transaction.c:334 at start_this_handle+0x4c0/0x4e0, CPU#0: 2/42 <4>[ 90.026661] Modules linked in: btrfs blake2b_generic xor xor_neon raid6_pq zstd_compress sm3_ce sha3_ce fuse drm backlight ip_tables x_tables <4>[ 90.027952] CPU: 0 UID: 0 PID: 42 Comm: kworker/u8:2 Not tainted 6.16.0-rc3-next-20250626 #1 PREEMPT <4>[ 90.029043] Hardware name: linux,dummy-virt (DT) <4>[ 90.029524] Workqueue: writeback wb_workfn (flush-7:0) <4>[ 90.030050] pstate: 63402009 (nZCv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--) <4>[ 90.030311] pc : start_this_handle (fs/jbd2/transaction.c:334 (discriminator 1)) <4>[ 90.030481] lr : start_this_handle (fs/jbd2/transaction.c:334 (discriminator 1)) <4>[ 90.030656] sp : ffffc000805cb650 <4>[ 90.030785] x29: ffffc000805cb690 x28: fff00000dd1f5000 x27: ffffde2ec0272000 <4>[ 90.031097] x26: 00000000000001a0 x25: 0000000000000015 x24: 0000000000000002 <4>[ 90.031360] x23: 0000000000000015 x22: 0000000000000c40 x21: 0000000000000008 <4>[ 90.031618] x20: fff00000c231da78 x19: fff00000c231da78 x18: 0000000000000000 <4>[ 90.031875] x17: 0000000000000000 x16: 0000000000000000 x15: 0000000000000000 <4>[ 90.032859] x14: 0000000000000000 x13: 00000000ffffffff x12: 0000000000000000 <4>[ 90.033225] x11: 0000000000000000 x10: ffffde2ebfba8bd0 x9 : ffffde2ebd34e944 <4>[ 90.033607] x8 : ffffc000805cb278 x7 : 0000000000000000 x6 : 0000000000000001 <4>[ 90.033971] x5 : ffffde2ebfb29000 x4 : ffffde2ebfb293d0 x3 : 0000000000000000 <4>[ 90.034294] x2 : 0000000000000000 x1 : fff00000c04dc080 x0 : 000000000000004c <4>[ 90.034772] Call trace: <4>[ 90.035068] start_this_handle (fs/jbd2/transaction.c:334 (discriminator 1)) (P) <4>[ 90.035366] jbd2__journal_start (fs/jbd2/transaction.c:501) <4>[ 90.035586] __ext4_journal_start_sb (fs/ext4/ext4_jbd2.c:117) <4>[ 90.035807] ext4_do_writepages (fs/ext4/ext4_jbd2.h:242 fs/ext4/inode.c:2846) <4>[ 90.036004] ext4_writepages (fs/ext4/inode.c:2953) <4>[ 90.036233] do_writepages (mm/page-writeback.c:2636) <4>[ 90.036406] __writeback_single_inode (fs/fs-writeback.c:1680) <4>[ 90.036616] writeback_sb_inodes (fs/fs-writeback.c:1978) <4>[ 90.036891] wb_writeback (fs/fs-writeback.c:2156) <4>[ 90.037122] wb_workfn (fs/fs-writeback.c:2303 (discriminator 1) fs/fs-writeback.c:2343 (discriminator 1)) <4>[ 90.037318] process_one_work (kernel/workqueue.c:3244) <4>[ 90.037517] worker_thread (kernel/workqueue.c:3316 (discriminator 2) kernel/workqueue.c:3403 (discriminator 2)) <4>[ 90.037752] kthread (kernel/kthread.c:463) <4>[ 90.037903] ret_from_fork (arch/arm64/kernel/entry.S:863) <4>[ 90.038217] ---[ end trace 0000000000000000 ]--- <2>[ 90.039950] EXT4-fs (loop0): ext4_do_writepages: jbd2_start: 9223372036854775807 pages, ino 14; err -28 <3>[ 90.040291] JBD2: kworker/u8:2 wants too many credits credits:416 rsv_credits:21 max:334 <4>[ 90.040374] ------------[ cut here ]------------ <4>[ 90.040386] WARNING: fs/jbd2/transaction.c:334 at start_this_handle+0x4c0/0x4e0, CPU#1: 2/42
## Source
- Kernel version: 6.16.0-rc3-next-20250626
- Git tree: https://kernel.googlesource.com/pub/scm/linux/kernel/git/next/linux-next.git
- Git sha: ecb259c4f70dd5c83907809f45bf4dc6869961d7
- Git describe: 6.16.0-rc3-next-20250626
- Project details:
https://qa-reports.linaro.org/lkft/linux-next-master/build/next-20250626/
- Architectures: arm64
- Toolchains: gcc-13
- Kconfigs: gcc-13-lkftconfig-64k_page_size
## Build arm64
- Test log: https://qa-reports.linaro.org/api/testruns/28894530/log_file/
- Test LAVA log 1:
https://lkft.validation.linaro.org/scheduler/job/8331353#L6841
- Test LAVA log 2:
https://lkft.validation.linaro.org/scheduler/job/8331352#L8854
- Test details:
https://regressions.linaro.org/lkft/linux-next-master/next-20250626/log-pars...
- Build link: https://storage.tuxsuite.com/public/linaro/lkft/builds/2z2V7LhiJecGzINkU7ObV...
- Kernel config:
https://storage.tuxsuite.com/public/linaro/lkft/builds/2z2V7LhiJecGzINkU7ObV...
-- Linaro LKFT https://lkft.linaro.org
-
Naresh Kamboju -
Zhang Yi