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WARNING: ODEBUG bug in nilfs_detach_log_writer (2)

Status: upstream: reported C repro on 2025/10/27 21:18
Subsystems: nilfs
[Documentation on labels]
Reported-by: syzbot+24d8b70f039151f65590@syzkaller.appspotmail.com
First crash: 3d17h, last: 3d08h
▶ ▼ Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [nilfs?] WARNING: ODEBUG bug in nilfs_detach_log_writer (2) 4 (7) 2025/10/28 08:09
▶ ▼ Similar bugs (1)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream WARNING: ODEBUG bug in nilfs_detach_log_writer nilfs -1 1 389d 382d 0/29 auto-obsoleted due to no activity on 2025/01/12 07:22
▶ ▼ Last patch testing requests (3)
Created Duration User Patch Repo Result
2025/10/28 07:45 19m eadavis@qq.com patch git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci report log
2025/10/28 05:16 29m eadavis@qq.com patch git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci report log
2025/10/28 03:27 31m eadavis@qq.com patch git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci OK log

Sample crash report:
------------[ cut here ]------------
ODEBUG: free active (active state 0) object: 00000000dacb411a object type: timer_list hint: __ll_sc_atomic64_andnot arch/arm64/include/asm/atomic_ll_sc.h:-1 [inline]
ODEBUG: free active (active state 0) object: 00000000dacb411a object type: timer_list hint: arch_atomic64_andnot arch/arm64/include/asm/atomic.h:64 [inline]
ODEBUG: free active (active state 0) object: 00000000dacb411a object type: timer_list hint: raw_atomic64_andnot include/linux/atomic/atomic-arch-fallback.h:3675 [inline]
ODEBUG: free active (active state 0) object: 00000000dacb411a object type: timer_list hint: raw_atomic_long_andnot include/linux/atomic/atomic-long.h:964 [inline]
ODEBUG: free active (active state 0) object: 00000000dacb411a object type: timer_list hint: arch_clear_bit include/asm-generic/bitops/atomic.h:25 [inline]
ODEBUG: free active (active state 0) object: 00000000dacb411a object type: timer_list hint: clear_bit include/asm-generic/bitops/instrumented-atomic.h:42 [inline]
ODEBUG: free active (active state 0) object: 00000000dacb411a object type: timer_list hint: clear_nilfs_purging fs/nilfs2/the_nilfs.h:206 [inline]
ODEBUG: free active (active state 0) object: 00000000dacb411a object type: timer_list hint: nilfs_construction_timeout+0x0/0x50 fs/nilfs2/segment.c:2893
WARNING: CPU: 0 PID: 6673 at lib/debugobjects.c:615 debug_print_object lib/debugobjects.c:612 [inline]
WARNING: CPU: 0 PID: 6673 at lib/debugobjects.c:615 __debug_check_no_obj_freed lib/debugobjects.c:1099 [inline]
WARNING: CPU: 0 PID: 6673 at lib/debugobjects.c:615 debug_check_no_obj_freed+0x390/0x470 lib/debugobjects.c:1129
Modules linked in:
CPU: 0 UID: 0 PID: 6673 Comm: syz-executor Not tainted syzkaller #0 PREEMPT 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/30/2025
pstate: 63400005 (nZCv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--)
pc : debug_print_object lib/debugobjects.c:612 [inline]
pc : __debug_check_no_obj_freed lib/debugobjects.c:1099 [inline]
pc : debug_check_no_obj_freed+0x390/0x470 lib/debugobjects.c:1129
lr : debug_print_object lib/debugobjects.c:612 [inline]
lr : __debug_check_no_obj_freed lib/debugobjects.c:1099 [inline]
lr : debug_check_no_obj_freed+0x390/0x470 lib/debugobjects.c:1129
sp : ffff8000a1547910
x29: ffff8000a1547950 x28: ffff0000cf608400 x27: 0000000000000000
x26: ffff80008aed7f20 x25: ffff0000cf608270 x24: ffff800082080a4c
x23: ffff0000d8cabfc0 x22: ffff0000cf608000 x21: dfff800000000000
x20: 0000000000000000 x19: ffff0000cf608000 x18: 00000000ffffffff
x17: 626f206131313462 x16: ffff800082de9540 x15: 0000000000000001
x14: 1fffe000337db6fa x13: 0000000000000000 x12: 0000000000000000
x11: ffff6000337db6fb x10: 0000000000ff0100 x9 : c941407f25652900
x8 : c941407f25652900 x7 : ffff8000805638d4 x6 : 0000000000000000
x5 : 0000000000000000 x4 : 0000000000000000 x3 : ffff8000807d4f2c
x2 : 0000000000000001 x1 : 0000000100000000 x0 : 0000000000000000
Call trace:
 debug_print_object lib/debugobjects.c:612 [inline] (P)
 __debug_check_no_obj_freed lib/debugobjects.c:1099 [inline] (P)
 debug_check_no_obj_freed+0x390/0x470 lib/debugobjects.c:1129 (P)
 slab_free_hook mm/slub.c:2454 [inline]
 slab_free mm/slub.c:6611 [inline]
 kfree+0x120/0x600 mm/slub.c:6818
 nilfs_segctor_destroy fs/nilfs2/segment.c:2811 [inline]
 nilfs_detach_log_writer+0x668/0x8cc fs/nilfs2/segment.c:2877
 nilfs_put_super+0x4c/0x12c fs/nilfs2/super.c:509
 generic_shutdown_super+0x12c/0x2b8 fs/super.c:642
 kill_block_super+0x44/0x90 fs/super.c:1722
 deactivate_locked_super+0xc4/0x12c fs/super.c:473
 deactivate_super+0xe0/0x100 fs/super.c:506
 cleanup_mnt+0x31c/0x3ac fs/namespace.c:1327
 __cleanup_mnt+0x20/0x30 fs/namespace.c:1334
 task_work_run+0x1dc/0x260 kernel/task_work.c:227
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 exit_to_user_mode_loop+0xfc/0x178 kernel/entry/common.c:43
 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]
 arm64_exit_to_user_mode arch/arm64/kernel/entry-common.c:103 [inline]
 el0_svc+0x170/0x254 arch/arm64/kernel/entry-common.c:747
 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:765
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596
irq event stamp: 136662
hardirqs last  enabled at (136661): [<ffff800080559f90>] vprintk_store+0x898/0xac8 kernel/printk/printk.c:2329
hardirqs last disabled at (136662): [<ffff80008ade9670>] el1_brk64+0x20/0x54 arch/arm64/kernel/entry-common.c:434
softirqs last  enabled at (136170): [<ffff8000801f95fc>] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32
softirqs last disabled at (136168): [<ffff8000801f95c8>] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19
---[ end trace 0000000000000000 ]---
NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer
NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer
NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer
NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer
NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer
NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer
NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer
NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer
NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer
NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer
NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer
NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer
NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer
NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer
NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer
NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer
NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer
NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer
NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer
NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer
NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer
NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer
NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer
NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer
NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer
NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer
NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer
NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer
NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer
NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer
NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer
NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer
NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer
NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer
NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer
NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer
NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer
NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer
NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer
NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer
NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer
NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer
NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer
NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer
NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer
NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer
NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer
NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer
NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer
NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer
NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer
NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer
NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer
NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer
NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer
NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer
NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer
NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer
NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer
NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer
NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer
NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer
NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer
NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer
NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer
NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer
NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer
NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer
NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer
NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer
NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer
NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer
NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer
NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer
NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer
NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer
NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer

Crashes (4):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/10/25 09:50 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci b98c94eed4a9 c0460fcd .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-gce-arm64 WARNING: ODEBUG bug in nilfs_detach_log_writer
2025/10/25 02:36 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci b98c94eed4a9 c0460fcd .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-gce-arm64 WARNING: ODEBUG bug in nilfs_detach_log_writer
2025/10/25 06:29 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci b98c94eed4a9 c0460fcd .config console log report syz / log [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-gce-arm64 WARNING: ODEBUG bug in nilfs_detach_log_writer
2025/10/25 00:45 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci b98c94eed4a9 c0460fcd .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING: ODEBUG bug in nilfs_detach_log_writer
* Struck through repros no longer work on HEAD.