kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN NOPTI
Modules linked in:
CPU: 0 PID: 3436 Comm: kworker/u4:11 Not tainted 4.14.157-syzkaller #0
Workqueue: netns cleanup_net
task: 0000000044279597 task.stack: 000000003519df40
RIP: 0010:addrconf_rt_table+0x11f/0x290 net/ipv6/addrconf.c:2293
RSP: 0018:ffff8881a170f748 EFLAGS: 00010206
RAX: dffffc0000000000 RBX: ffff8881c5168000 RCX: 1ffff110334663f4
RDX: 000000000000004d RSI: 0000000000000005 RDI: 0000000000000268
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000004
R10: fffffbfff4946145 R11: ffffffffa4a30a2b R12: 00000000000000fe
R13: ffff8881c542c900 R14: 00000000000001b8 R15: ffff8881d6839d80
FS:  0000000000000000(0000) GS:ffff8881dba00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000718388 CR3: 000000007de26006 CR4: 00000000001606b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 addrconf_get_prefix_route+0x30/0x2d0 net/ipv6/addrconf.c:2347
 __ipv6_ifa_notify+0x6cb/0x940 net/ipv6/addrconf.c:5605
 addrconf_ifdown+0xa18/0x13b0 net/ipv6/addrconf.c:3722
 addrconf_notify+0x159/0x1b80 net/ipv6/addrconf.c:3526
 notifier_call_chain+0x10c/0x1a0 kernel/notifier.c:93
 call_netdevice_notifiers net/core/dev.c:1687 [inline]
 rollback_registered_many+0x6ac/0xab0 net/core/dev.c:7213
 unregister_netdevice_many.part.0+0x16/0x1d0 net/core/dev.c:8267
 unregister_netdevice_many+0x36/0x50 net/core/dev.c:8266
 ip_tunnel_delete_net+0x273/0x340 net/ipv4/ip_tunnel.c:1079
 ops_exit_list.isra.0+0xa8/0x150 net/core/net_namespace.c:142
 cleanup_net+0x3ce/0x870 net/core/net_namespace.c:484
 process_one_work+0x7f1/0x1580 kernel/workqueue.c:2134
 worker_thread+0xdd/0xdf0 kernel/workqueue.c:2271
 kthread+0x31f/0x430 kernel/kthread.c:232
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:404
Code: 91 a3 be 01 00 00 00 48 c7 c7 a0 52 6d a4 e8 c9 8b ae fe 48 8d bd 68 02 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e 34 01 00 00 44 8b ad 68 02 
RIP: addrconf_rt_table+0x11f/0x290 net/ipv6/addrconf.c:2293 RSP: ffff8881a170f748
---[ end trace 6232a5c2e3e19728 ]---