------------[ cut here ]------------
ODEBUG: free active (active state 0) object: ffff88810b803278 object type: timer_list hint: br_ip6_multicast_port_query_expired+0x0/0x380
WARNING: lib/debugobjects.c:632 at debug_check_no_obj_freed+0x405/0x550, CPU#1: kworker/1:2/797
Modules linked in:
CPU: 1 UID: 0 PID: 797 Comm: kworker/1:2 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
Workqueue: mld mld_ifc_work
RIP: 0010:debug_check_no_obj_freed+0x44a/0x550
Code: 89 44 24 20 e8 17 4e 74 fd 48 8b 44 24 20 4c 8b 4d 00 4c 89 ef 48 c7 c6 20 b4 28 8c 48 c7 c2 a0 b9 28 8c 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:ffffc90000a08c90 EFLAGS: 00010246

RAX: ffffffff8a7e2010 RBX: ffffffff9a69cb90 RCX: 0000000000000000
RDX: ffffffff8c28b9a0 RSI: ffffffff8c28b420 RDI: ffffffff903bc8a0
RBP: ffffffff8bcf3a20 R08: ffff88810b803278 R09: ffffffff8bcf4d80
R10: dffffc0000000000 R11: ffffffff81b21a20 R12: ffff88810b803400
R13: ffffffff903bc8a0 R14: ffff88810b803000 R15: ffff88810b803278
FS:  0000000000000000(0000) GS:ffff8882a9287000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000008 CR3: 00000001869f2000 CR4: 00000000000006f0
Call Trace:
 <IRQ>
 kfree+0x13e/0x640
 kobject_put+0x228/0x560
 rcu_core+0x7cd/0x1070
 handle_softirqs+0x22a/0x840
 do_softirq+0x76/0xd0
 </IRQ>
 <TASK>
 __local_bh_enable_ip+0xf8/0x130
 __alloc_skb+0x1aa/0x7d0
 mld_newpack+0x14c/0xc90
 add_grhead+0x5a/0x2a0
 add_grec+0x1452/0x1740
 mld_ifc_work+0x6e6/0xe70
 process_scheduled_works+0xb5d/0x1860
 worker_thread+0xa53/0xfc0
 kthread+0x388/0x470
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30
 </TASK>
