------------[ cut here ]------------
ODEBUG: assert_init not available (active state 0) object type: timer_list hint: addrconf_rs_timer+0x0/0x820 net/ipv6/addrconf.c:1868
WARNING: CPU: 1 PID: 10917 at lib/debugobjects.c:505 debug_print_object+0x16e/0x250 lib/debugobjects.c:505
Modules linked in:
CPU: 1 PID: 10917 Comm: kworker/u4:7 Not tainted 5.16.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: netns cleanup_net
RIP: 0010:debug_print_object+0x16e/0x250 lib/debugobjects.c:505
Code: ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 af 00 00 00 48 8b 14 dd 40 29 05 8a 4c 89 ee 48 c7 c7 40 1d 05 8a e8 ac b7 21 05 <0f> 0b 83 05 b5 a4 b2 09 01 48 83 c4 18 5b 5d 41 5c 41 5d 41 5e c3
RSP: 0018:ffffc900072ff6a0 EFLAGS: 00010282
RAX: 0000000000000000 RBX: 0000000000000005 RCX: 0000000000000000
RDX: ffff888017aeba00 RSI: ffffffff815f0c28 RDI: fffff52000e5fec6
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffff815ea9ce R11: 0000000000000000 R12: ffffffff89adf660
R13: ffffffff8a0523c0 R14: ffffffff81660140 R15: 1ffff92000e5fedf
FS:  0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005555569c8848 CR3: 000000000b88e000 CR4: 00000000003526e0
Call Trace:
 <TASK>
 debug_object_assert_init lib/debugobjects.c:895 [inline]
 debug_object_assert_init+0x1f4/0x2e0 lib/debugobjects.c:866
 debug_timer_assert_init kernel/time/timer.c:739 [inline]
 debug_assert_init kernel/time/timer.c:784 [inline]
 del_timer+0x6d/0x110 kernel/time/timer.c:1204
 addrconf_del_rs_timer net/ipv6/addrconf.c:315 [inline]
 addrconf_ifdown.isra.0+0x554/0x1630 net/ipv6/addrconf.c:3785
 addrconf_notify+0xeb/0x1bb0 net/ipv6/addrconf.c:3651
 notifier_call_chain+0xb5/0x200 kernel/notifier.c:83
 call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:2002
 call_netdevice_notifiers_extack net/core/dev.c:2014 [inline]
 call_netdevice_notifiers net/core/dev.c:2028 [inline]
 unregister_netdevice_many+0x94f/0x1790 net/core/dev.c:11077
 sit_exit_batch_net+0x530/0x750 net/ipv6/sit.c:1951
 ops_exit_list+0x10d/0x160 net/core/net_namespace.c:171
 cleanup_net+0x4ea/0xb00 net/core/net_namespace.c:593
 process_one_work+0x9b2/0x1690 kernel/workqueue.c:2298
 worker_thread+0x658/0x11f0 kernel/workqueue.c:2445
 kthread+0x405/0x4f0 kernel/kthread.c:327
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>