Hello, I found a potential bug titled " kernel BUG in write_dev_supers " with modified syzkaller in the Linux6.15-rc1. If you fix this issue, please add the following tag to the commit: Reported-by: Jianzhou Zhao luckd0g@163.com, xingwei lee xrivendell7@gmail.com The commit of the kernel is : 0af2f6be1b4281385b618cb86ad946eded089ac8 kernel config: https://syzkaller.appspot.com/text?tag=KernelConfig&x=4c918722cb7e3d7 compiler: gcc version 11.4.0
Unfortunately, we failed to generate the reproduction program of this bug.
------------[ cut here ]----------------------------------------- TITLE: kernel BUG in write_dev_supers ------------[ cut here ]------------ ================================================================== assertion failed: folio_order(folio) == 0, in fs/btrfs/disk-io.c:3856 ------------[ cut here ]------------ kernel BUG at fs/btrfs/disk-io.c:3856! Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI CPU: 0 UID: 0 PID: 9462 Comm: syz-executor Not tainted 6.15.0-rc1-dirty #9 PREEMPT(full) Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014 RIP: 0010:write_dev_supers+0x7f0/0x910 fs/btrfs/disk-io.c:3856 Code: e9 03 ff ff ff e8 70 a3 eb fd b9 10 0f 00 00 48 c7 c2 60 c0 d9 8b 48 c7 c6 60 c7 d9 8b 48 c7 c7 e0 c0 d9 8b e8 41 d4 ca fd 90 <0f> 0b 48 8b 7c 24 38 e8 04 f9 51 fe e9 3d f9 ff ff e8 3a f8 51 fe RSP: 0018:ffffc900053ff7c0 EFLAGS: 00010286 RAX: 0000000000000045 RBX: ffff888029e60000 RCX: ffffffff819a5929 RDX: 0000000000000000 RSI: ffff88801eb9bc80 RDI: 0000000000000002 RBP: ffffea0001560a00 R08: fffffbfff1c4bb00 R09: fffff52000a7feb1 R10: fffff52000a7feb0 R11: ffffc900053ff587 R12: dffffc0000000000 R13: 0000000000000000 R14: 0000000000000002 R15: 0000000001000000 FS: 000055556e3c5500(0000) GS:ffff888097b41000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f8af4976080 CR3: 0000000076248000 CR4: 0000000000752ef0 PKRU: 80000000 Call Trace: <TASK> write_all_supers+0x921/0x3680 fs/btrfs/disk-io.c:4153 btrfs_commit_transaction+0x2dad/0x4620 fs/btrfs/transaction.c:2541 btrfs_sync_fs+0x130/0x760 fs/btrfs/super.c:1040 sync_filesystem fs/sync.c:66 [inline] sync_filesystem+0x1d3/0x2a0 fs/sync.c:30 generic_shutdown_super+0x74/0x390 fs/super.c:621 kill_anon_super+0x3a/0x60 fs/super.c:1237 btrfs_kill_super+0x3c/0x50 fs/btrfs/super.c:2100 deactivate_locked_super+0xb8/0x130 fs/super.c:473 deactivate_super fs/super.c:506 [inline] deactivate_super+0xb1/0xd0 fs/super.c:502 cleanup_mnt+0x378/0x510 fs/namespace.c:1435 task_work_run+0x16f/0x280 kernel/task_work.c:227 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop kernel/entry/common.c:114 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0x29e/0x2a0 kernel/entry/common.c:218 do_syscall_64+0xdc/0x260 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fe31fbadfcb Code: a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 90 f3 0f 1e fa 31 f6 e9 05 00 00 00 0f 1f 44 00 00 f3 0f 1e fa b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 05 c3 0f 1f 40 00 48 c7 c2 a8 ff ff ff f7 d8 RSP: 002b:00007fff6eed1d98 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 00000000000000cf RCX: 00007fe31fbadfcb RDX: 00007fe31fa4eb30 RSI: 0000000000000009 RDI: 00007fff6eed1e50 RBP: 00007fff6eed1e50 R08: 0000000000000000 R09: 00007fff6eed1c20 R10: 000055556e3d8673 R11: 0000000000000246 R12: 00007fe31fc44135 R13: 00007fff6eed2f20 R14: 000055556e3d8600 R15: 000000000003644b </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:write_dev_supers+0x7f0/0x910 fs/btrfs/disk-io.c:3856 Code: e9 03 ff ff ff e8 70 a3 eb fd b9 10 0f 00 00 48 c7 c2 60 c0 d9 8b 48 c7 c6 60 c7 d9 8b 48 c7 c7 e0 c0 d9 8b e8 41 d4 ca fd 90 <0f> 0b 48 8b 7c 24 38 e8 04 f9 51 fe e9 3d f9 ff ff e8 3a f8 51 fe RSP: 0018:ffffc900053ff7c0 EFLAGS: 00010286 RAX: 0000000000000045 RBX: ffff888029e60000 RCX: ffffffff819a5929 RDX: 0000000000000000 RSI: ffff88801eb9bc80 RDI: 0000000000000002 RBP: ffffea0001560a00 R08: fffffbfff1c4bb00 R09: fffff52000a7feb1 R10: fffff52000a7feb0 R11: ffffc900053ff587 R12: dffffc0000000000 R13: 0000000000000000 R14: 0000000000000002 R15: 0000000001000000 FS: 000055556e3c5500(0000) GS:ffff8880eb341000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fa5b213e730 CR3: 0000000076248000 CR4: 0000000000752ef0 PKRU: 80000000 ==================================================================
I hope it helps. Best regards Jianzhou Zhao