syzbot

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ODEBUG: free active (active state 0) object: ffff888052eb0448 object type: work_struct hint: mddev_delayed_delete+0x0/0x20 drivers/md/md.c:721
WARNING: CPU: 0 PID: 25432 at lib/debugobjects.c:612 debug_print_object+0x1a2/0x2b0 lib/debugobjects.c:612
Modules linked in:
CPU: 0 UID: 0 PID: 25432 Comm: syz.4.4817 Not tainted 6.16.0-syzkaller-11852-g479058002c32 #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 21 16 8c 4c 89 e6 48 c7 c7 60 16 16 8c e8 cf 43 90 fc 90 <0f> 0b 90 90 58 83 05 76 37 c1 0b 01 48 83 c4 18 5b 5d 41 5c 41 5d
RSP: 0018:ffffc9000c267b48 EFLAGS: 00010282
RAX: 0000000000000000 RBX: 0000000000000003 RCX: ffffffff817a3358
RDX: ffff88804f98c880 RSI: ffffffff817a3365 RDI: 0000000000000001
RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: fffffffffffc3b60 R12: ffffffff8c161d00
R13: ffffffff8bac1840 R14: ffffffff885747d0 R15: ffffc9000c267c48
FS:  00005555662be500(0000) GS:ffff8881246c6000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b321faff8 CR3: 0000000034024000 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+0x402/0xb70 fs/file_table.c:468
 task_work_run+0x150/0x240 kernel/task_work.c:227
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 exit_to_user_mode_loop+0xeb/0x110 kernel/entry/common.c:43
 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [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: 0033:0x7f7d2458ebe9
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:00007fff6ff16738 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007f7d247b7da0 RCX: 00007f7d2458ebe9
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007f7d247b7da0 R08: 00000000000275b0 R09: 0000001a6ff16a2f
R10: 00007f7d247b7cb0 R11: 0000000000000246 R12: 00000000001cf1b6
R13: 00007f7d247b6090 R14: ffffffffffffffff R15: 00007fff6ff16850
 </TASK>