linux-kernel - [syzbot] [block?] WARNING: ODEBUG bug in disk

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Message-ID: <688d8708.050a0220.f0410.0135.GAE@google.com>
Date: Fri, 01 Aug 2025 20:33:28 -0700
From: syzbot <syzbot+1fe2f3ddc7f8f83fb196@...kaller.appspotmail.com>
To: axboe@...nel.dk, linux-block@...r.kernel.org, linux-kernel@...r.kernel.org, 
	syzkaller-bugs@...glegroups.com
Subject: [syzbot] [block?] WARNING: ODEBUG bug in disk_release

Hello,

syzbot found the following issue on:

HEAD commit:    89748acdf226 Merge tag 'drm-next-2025-08-01' of https://gi..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=151c12a2580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=ff858d5d4508232d
dashboard link: https://syzkaller.appspot.com/bug?extid=1fe2f3ddc7f8f83fb196
compiler:       gcc (Debian 12.2.0-14+deb12u1) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/4f34b67c9cfc/disk-89748acd.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/2f11bb9a095b/vmlinux-89748acd.xz
kernel image: https://storage.googleapis.com/syzbot-assets/3e15dbd303fb/bzImage-89748acd.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+1fe2f3ddc7f8f83fb196@...kaller.appspotmail.com

md: md2 stopped.
------------[ cut here ]------------
ODEBUG: free active (active state 0) object: ffff88801f3b4448 object type: work_struct hint: mddev_delayed_delete+0x0/0x20 drivers/md/md.c:721
WARNING: CPU: 0 PID: 11789 at lib/debugobjects.c:612 debug_print_object+0x1a2/0x2b0 lib/debugobjects.c:612
Modules linked in:
CPU: 0 UID: 0 PID: 11789 Comm: syz.5.1495 Not tainted 6.16.0-syzkaller-10499-g89748acdf226 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:debug_print_object+0x1a2/0x2b0 lib/debugobjects.c:612
Code: fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 75 54 41 56 48 8b 14 dd e0 0a 16 8c 4c 89 e6 48 c7 c7 60 ff 15 8c e8 bf 92 90 fc 90 <0f> 0b 90 90 58 83 05 b6 a5 bf 0b 01 48 83 c4 18 5b 5d 41 5c 41 5d
RSP: 0018:ffffc90004a6f928 EFLAGS: 00010286
RAX: 0000000000000000 RBX: 0000000000000003 RCX: ffffc9001b884000
RDX: 0000000000080000 RSI: ffffffff817a2815 RDI: 0000000000000001
RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: ffffffff8c160600
R13: ffffffff8bac16a0 R14: ffffffff8856a0a0 R15: ffffc90004a6fa28
FS:  00007f777160f6c0(0000) GS:ffff8881246fb000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000011a000 CR3: 000000005441a000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 __debug_check_no_obj_freed lib/debugobjects.c:1099 [inline]
 debug_check_no_obj_freed+0x4b7/0x600 lib/debugobjects.c:1129
 slab_free_hook mm/slub.c:2348 [inline]
 slab_free mm/slub.c:4680 [inline]
 kfree+0x28f/0x4d0 mm/slub.c:4879
 disk_release+0x2a1/0x410 block/genhd.c:1310
 device_release+0xa4/0x240 drivers/base/core.c:2565
 kobject_cleanup lib/kobject.c:689 [inline]
 kobject_release lib/kobject.c:720 [inline]
 kref_put include/linux/kref.h:65 [inline]
 kobject_put+0x1e7/0x5a0 lib/kobject.c:737
 put_device+0x1f/0x30 drivers/base/core.c:3797
 blkdev_release+0x15/0x20 block/fops.c:699
 __fput+0x3ff/0xb70 fs/file_table.c:468
 task_work_run+0x14d/0x240 kernel/task_work.c:227
 get_signal+0x1d1/0x26d0 kernel/signal.c:2807
 arch_do_signal_or_restart+0x8f/0x7d0 arch/x86/kernel/signal.c:337
 exit_to_user_mode_loop+0x84/0x110 kernel/entry/common.c:40
 exit_to_user_mode_prepare include/linux/irq-entry-common.h:224 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline]
 do_syscall_64+0x3f6/0x4c0 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f777078eb69
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f777160f038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: 0000000000000000 RBX: 00007f77709b6160 RCX: 00007f777078eb69
RDX: 0000000000000007 RSI: 0000000000000932 RDI: 0000000000000007
RBP: 00007f7770811df1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f77709b6160 R15: 00007ffcb194e248
 </TASK>


---
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