------------[ cut here ]------------
ODEBUG: free active (active state 0) object: ffff88810a17ea38 object type: timer_list hint: delayed_sync_fs+0x0/0xf0 fs/hfsplus/super.c:-1
WARNING: lib/debugobjects.c:615 at 0x0, CPU#1: syz-executor/5946
Modules linked in:
CPU: 1 UID: 0 PID: 5946 Comm: syz-executor Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:debug_print_object lib/debugobjects.c:612 [inline]
RIP: 0010:__debug_check_no_obj_freed lib/debugobjects.c:1099 [inline]
RIP: 0010:debug_check_no_obj_freed+0x44a/0x550 lib/debugobjects.c:1129
Code: 89 44 24 20 e8 47 4a 92 fd 48 8b 44 24 20 4c 8b 4d 00 4c 89 ef 48 c7 c6 20 02 c0 8b 48 c7 c2 40 07 c0 8b 8b 0c 24 4d 89 f8 50 <67> 48 0f b9 3a 48 83 c4 08 4c 8b 6c 24 18 48 b9 00 00 00 00 00 fc
RSP: 0018:ffffc900032b7c18 EFLAGS: 00010246
RAX: ffffffff829ca540 RBX: ffffffff99a849a0 RCX: 0000000000000000
RDX: ffffffff8bc00740 RSI: ffffffff8bc00220 RDI: ffffffff8f8b7a70
RBP: ffffffff8b6d2540 R08: ffff88810a17ea38 R09: ffffffff8b6d36a0
R10: dffffc0000000000 R11: ffffffff81ae6210 R12: ffff88810a17ec00
R13: ffffffff8f8b7a70 R14: ffff88810a17e000 R15: ffff88810a17ea38
FS:  0000555587657500(0000) GS:ffff8882a9e8e000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055b55b316738 CR3: 0000000175d56000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 slab_free_hook mm/slub.c:2471 [inline]
 slab_free mm/slub.c:6663 [inline]
 kfree+0x13b/0x660 mm/slub.c:6871
 hfsplus_kill_sb+0x72/0xb0 fs/hfsplus/super.c:717
 deactivate_locked_super+0xbc/0x130 fs/super.c:474
 cleanup_mnt+0x425/0x4c0 fs/namespace.c:1318
 task_work_run+0x1d4/0x260 kernel/task_work.c:233
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 __exit_to_user_mode_loop kernel/entry/common.c:44 [inline]
 exit_to_user_mode_loop+0xff/0x4f0 kernel/entry/common.c:75
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:159 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:194 [inline]
 do_syscall_64+0x2e3/0xf80 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f540cf90af7
Code: a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 a8 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007ffc80b82ab8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f540cfee72f RCX: 00007f540cf90af7
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffc80b82b70
RBP: 00007ffc80b82b70 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffc80b83c00
R13: 00007f540cfee72f R14: 000000000001120e R15: 00007ffc80b83c40
 </TASK>
----------------
Code disassembly (best guess):
   0:	89 44 24 20          	mov    %eax,0x20(%rsp)
   4:	e8 47 4a 92 fd       	call   0xfd924a50
   9:	48 8b 44 24 20       	mov    0x20(%rsp),%rax
   e:	4c 8b 4d 00          	mov    0x0(%rbp),%r9
  12:	4c 89 ef             	mov    %r13,%rdi
  15:	48 c7 c6 20 02 c0 8b 	mov    $0xffffffff8bc00220,%rsi
  1c:	48 c7 c2 40 07 c0 8b 	mov    $0xffffffff8bc00740,%rdx
  23:	8b 0c 24             	mov    (%rsp),%ecx
  26:	4d 89 f8             	mov    %r15,%r8
  29:	50                   	push   %rax
* 2a:	67 48 0f b9 3a       	ud1    (%edx),%rdi <-- trapping instruction
  2f:	48 83 c4 08          	add    $0x8,%rsp
  33:	4c 8b 6c 24 18       	mov    0x18(%rsp),%r13
  38:	48                   	rex.W
  39:	b9 00 00 00 00       	mov    $0x0,%ecx
  3e:	00 fc                	add    %bh,%ah