------------[ cut here ]------------ ODEBUG: free active (active state 0) object: ffff888036e02448 object type: work_struct hint: mddev_delayed_delete+0x0/0x20 drivers/md/md.c:721 WARNING: CPU: 0 PID: 6535 at lib/debugobjects.c:612 debug_print_object+0x1a2/0x2b0 lib/debugobjects.c:612 Modules linked in: CPU: 0 UID: 0 PID: 6535 Comm: syz.1.167 Not tainted 6.16.0-syzkaller-06699-ge8d780dcd957 #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 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 60 1c 16 8c 4c 89 e6 48 c7 c7 e0 10 16 8c e8 af 3d 91 fc 90 <0f> 0b 90 90 58 83 05 36 11 bf 0b 01 48 83 c4 18 5b 5d 41 5c 41 5d RSP: 0018:ffffc9000611fb48 EFLAGS: 00010282 RAX: 0000000000000000 RBX: 0000000000000003 RCX: ffffffff817a3658 RDX: ffff888055c12440 RSI: ffffffff817a3665 RDI: 0000000000000001 RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000001 R12: ffffffff8c161780 R13: ffffffff8bac2160 R14: ffffffff8853a690 R15: ffffc9000611fc48 FS: 0000555591a87500(0000) GS:ffff8880d671e000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fffebf7ef00 CR3: 000000003b484000 CR4: 0000000000352ef0 Call Trace: __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:2347 [inline] slab_free mm/slub.c:4679 [inline] kfree+0x28f/0x4d0 mm/slub.c:4878 disk_release+0x2a4/0x410 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+0x14d/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:208 [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: 0033:0x7f116958e9a9 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:00007ffff598ef78 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4 RAX: 0000000000000000 RBX: 0000000000010bbf RCX: 00007f116958e9a9 RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003 RBP: 00007f11697b7ba0 R08: 0000000000000001 R09: 0000000ff598f26f R10: 00007f1169400000 R11: 0000000000000246 R12: 00007f11697b5fac R13: 00007f11697b5fa0 R14: ffffffffffffffff R15: 00007ffff598f090