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ODEBUG: free active (active state 0) object: ffff88803e6d1278 object type: timer_list hint: br_ip6_multicast_port_query_expired+0x0/0x20 net/bridge/br_private.h:1293
WARNING: lib/debugobjects.c:629 at debug_print_object+0x18e/0x2a0 lib/debugobjects.c:629, CPU#0: ksoftirqd/0/15
Modules linked in:
CPU: 0 UID: 0 PID: 15 Comm: ksoftirqd/0 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:debug_print_object+0x19b/0x2a0 lib/debugobjects.c:629
Code: b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 75 4f 48 8d 3d 32 fd df 0b 41 56 48 8b 14 dd 40 53 1c 8c 4c 89 e6 <67> 48 0f b9 3a 58 83 05 cc 99 d5 0b 01 48 83 c4 18 5b 5d 41 5c 41
RSP: 0018:ffffc90000127a08 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: 0000000000000003 RCX: 0000000000000000
RDX: ffffffff8c1c5280 RSI: ffffffff8c1c4ea0 RDI: ffffffff90e26d40
RBP: 0000000000000001 R08: ffff88803e6d1278 R09: ffffffff8bb2c760
R10: 0000000000000001 R11: 0000000000000000 R12: ffffffff8c1c4ea0
R13: ffffffff8bb2c7a0 R14: ffffffff8a654230 R15: ffffc90000127b08
FS:  0000000000000000(0000) GS:ffff8880d636d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00002000000044c0 CR3: 0000000030440000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 __debug_check_no_obj_freed lib/debugobjects.c:1116 [inline]
 debug_check_no_obj_freed+0x4da/0x630 lib/debugobjects.c:1146
 slab_free_hook mm/slub.c:2620 [inline]
 slab_free mm/slub.c:6250 [inline]
 kfree+0x3d0/0x6c0 mm/slub.c:6565
 kobject_cleanup lib/kobject.c:689 [inline]
 kobject_release lib/kobject.c:720 [inline]
 kref_put include/linux/kref.h:65 [inline]
 kobject_put+0x1f7/0x640 lib/kobject.c:737
 rcu_do_batch kernel/rcu/tree.c:2617 [inline]
 rcu_core+0x5a2/0x10d0 kernel/rcu/tree.c:2869
 handle_softirqs+0x1ea/0xa00 kernel/softirq.c:622
 run_ksoftirqd kernel/softirq.c:1076 [inline]
 run_ksoftirqd+0x38/0x60 kernel/softirq.c:1068
 smpboot_thread_fn+0x3d3/0xaa0 kernel/smpboot.c:160
 kthread+0x370/0x450 kernel/kthread.c:436
 ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
----------------
Code disassembly (best guess):
   0:	b8 00 00 00 00       	mov    $0x0,%eax
   5:	00 fc                	add    %bh,%ah
   7:	ff                   	lcall  (bad)
   8:	df 48 89             	fisttps -0x77(%rax)
   b:	fa                   	cli
   c:	48 c1 ea 03          	shr    $0x3,%rdx
  10:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1)
  14:	75 4f                	jne    0x65
  16:	48 8d 3d 32 fd df 0b 	lea    0xbdffd32(%rip),%rdi        # 0xbdffd4f
  1d:	41 56                	push   %r14
  1f:	48 8b 14 dd 40 53 1c 	mov    -0x73e3acc0(,%rbx,8),%rdx
  26:	8c
  27:	4c 89 e6             	mov    %r12,%rsi
* 2a:	67 48 0f b9 3a       	ud1    (%edx),%rdi <-- trapping instruction
  2f:	58                   	pop    %rax
  30:	83 05 cc 99 d5 0b 01 	addl   $0x1,0xbd599cc(%rip)        # 0xbd59a03
  37:	48 83 c4 18          	add    $0x18,%rsp
  3b:	5b                   	pop    %rbx
  3c:	5d                   	pop    %rbp
  3d:	41 5c                	pop    %r12
  3f:	41                   	rex.B