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Message-ID: <69007a22.050a0220.3344a1.03ab.GAE@google.com>
Date: Tue, 28 Oct 2025 01:09:06 -0700
From: syzbot <syzbot+24d8b70f039151f65590@...kaller.appspotmail.com>
To: eadavis@...com, linux-kernel@...r.kernel.org, 
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [nilfs?] WARNING: ODEBUG bug in nilfs_detach_log_writer (2)

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
WARNING: ODEBUG bug in nilfs_detach_log_writer

!!! sci 00000000654d1193 sctask 000000001d256998 nilfs_segctor_destroy
------------[ cut here ]------------
ODEBUG: free active (active state 0) object: 00000000cb289602 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: 00000000cb289602 object type: timer_list hint: arch_atomic64_andnot arch/arm64/include/asm/atomic.h:64 [inline]
ODEBUG: free active (active state 0) object: 00000000cb289602 object type: timer_list hint: raw_atomic64_andnot include/linux/atomic/atomic-arch-fallback.h:3675 [inline]
ODEBUG: free active (active state 0) object: 00000000cb289602 object type: timer_list hint: raw_atomic_long_andnot include/linux/atomic/atomic-long.h:964 [inline]
ODEBUG: free active (active state 0) object: 00000000cb289602 object type: timer_list hint: arch_clear_bit include/asm-generic/bitops/atomic.h:25 [inline]
ODEBUG: free active (active state 0) object: 00000000cb289602 object type: timer_list hint: clear_bit include/asm-generic/bitops/instrumented-atomic.h:42 [inline]
ODEBUG: free active (active state 0) object: 00000000cb289602 object type: timer_list hint: clear_nilfs_purging fs/nilfs2/the_nilfs.h:206 [inline]
ODEBUG: free active (active state 0) object: 00000000cb289602 object type: timer_list hint: nilfs_construction_timeout+0x0/0x50 fs/nilfs2/segment.c:2897
WARNING: CPU: 0 PID: 7171 at lib/debugobjects.c:615 debug_print_object lib/debugobjects.c:612 [inline]
WARNING: CPU: 0 PID: 7171 at lib/debugobjects.c:615 __debug_check_no_obj_freed lib/debugobjects.c:1099 [inline]
WARNING: CPU: 0 PID: 7171 at lib/debugobjects.c:615 debug_check_no_obj_freed+0x390/0x470 lib/debugobjects.c:1129
Modules linked in:
CPU: 0 UID: 0 PID: 7171 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 : ffff80009d0378f0
x29: ffff80009d037930 x28: ffff0000d5f63c00 x27: 0000000000000000
x26: ffff80008aed7f20 x25: ffff0000d5f63a70 x24: ffff800082080abc
x23: ffff0000c6402188 x22: ffff0000d5f63000 x21: dfff800000000000
x20: 0000000000000000 x19: ffff0000d5f63800 x18: 1fffe000337db690
x17: 626f203230363938 x16: ffff800082de95c0 x15: 0000000000000001
x14: 1fffe000337db6fa x13: 0000000000000000 x12: 0000000000000000
x11: ffff6000337db6fb x10: 0000000000ff0100 x9 : b75f7cbc17284200
x8 : b75f7cbc17284200 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:2815 [inline]
 nilfs_detach_log_writer+0x69c/0x93c fs/nilfs2/segment.c:2881
 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: 199786
hardirqs last  enabled at (199785): [<ffff800080559f90>] vprintk_store+0x898/0xac8 kernel/printk/printk.c:2329
hardirqs last disabled at (199786): [<ffff80008ade9700>] el1_brk64+0x20/0x54 arch/arm64/kernel/entry-common.c:434
softirqs last  enabled at (199286): [<ffff8000801f95fc>] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32
softirqs last disabled at (199284): [<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
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


Tested on:

commit:         b98c94ee arm64: mte: Do not warn if the page is alread..
git tree:       git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci
console output: https://syzkaller.appspot.com/x/log.txt?x=1554dd42580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=158bd6857eb7a550
dashboard link: https://syzkaller.appspot.com/bug?extid=24d8b70f039151f65590
compiler:       Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
userspace arch: arm64
patch:          https://syzkaller.appspot.com/x/patch.diff?x=178d832f980000

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