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
Modules linked in:
CPU: 1 PID: 635 Comm: kworker/u4:10 Not tainted 4.9.205-syzkaller #0
Workqueue: netns cleanup_net
task: 000000008eac5850 task.stack: 000000006361b119
RIP: 0010:[<ffffffff826c4c07>]  [<00000000436a8fca>] addrconf_rt_table+0x127/0x290 net/ipv6/addrconf.c:2226
RSP: 0018:ffff8801980f7508  EFLAGS: 00010206
RAX: dffffc0000000000 RBX: ffff88018256d500 RCX: 0000000000000004
RDX: 0000000000000056 RSI: 0000000000000000 RDI: 00000000000002b0
RBP: ffff8801980f7538 R08: 0000000000000000 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000001 R12: 00000000000000fe
R13: 0000000000000200 R14: 0000000000000000 R15: ffff8801cdd18000
FS:  0000000000000000(0000) GS:ffff8801db700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffe8549ed50 CR3: 00000001a9ae0000 CR4: 00000000001606b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffffffff826c4ae0 ffff880181610f00 ffff88018256d500 0000000000000000
 0000000000000080 ffff8801cdd18000 ffff8801980f7580 ffffffff826c59f4
 0000000000000000 ffff880181611090 ffff880181610f00 ffff880181611090
Call Trace:
 [<00000000c40124cb>] addrconf_get_prefix_route+0x34/0x270 net/ipv6/addrconf.c:2280
 [<00000000e5da9ca2>] __ipv6_ifa_notify+0x642/0x880 net/ipv6/addrconf.c:5520
 [<000000005be7852a>] addrconf_ifdown+0xa89/0x14d0 net/ipv6/addrconf.c:3692
 [<00000000a81cb00a>] addrconf_notify+0x7ac/0x1f50 net/ipv6/addrconf.c:3496
 [<00000000a954a6f8>] notifier_call_chain+0xb4/0x1d0 kernel/notifier.c:93
 [<000000008f2c90c8>] __raw_notifier_call_chain kernel/notifier.c:394 [inline]
 [<000000008f2c90c8>] raw_notifier_call_chain+0x2e/0x40 kernel/notifier.c:401
 [<00000000d4194a1c>] call_netdevice_notifiers_info+0x56/0x70 net/core/dev.c:1647
 [<0000000027f5fbca>] call_netdevice_notifiers net/core/dev.c:1663 [inline]
 [<0000000027f5fbca>] rollback_registered_many+0x6ef/0xb50 net/core/dev.c:6863
 [<0000000084756751>] unregister_netdevice_many.part.0+0x1b/0x1e0 net/core/dev.c:7912
 [<000000002e4318e0>] unregister_netdevice_many+0x3b/0x50 net/core/dev.c:7911
 [<0000000026a990ff>] ip_tunnel_delete_net+0x2b1/0x390 net/ipv4/ip_tunnel.c:1069
 [<000000007a6927a9>] vti_exit_net+0x129/0x1f0 net/ipv4/ip_vti.c:499
 [<00000000059514d9>] ops_exit_list.isra.0+0xb0/0x160 net/core/net_namespace.c:136
 [<00000000db263e71>] cleanup_net+0x3d6/0x8a0 net/core/net_namespace.c:474
 [<00000000c172e8e4>] process_one_work+0x88b/0x1600 kernel/workqueue.c:2114
 [<000000003aee7e0b>] worker_thread+0x5df/0x11d0 kernel/workqueue.c:2251
 [<0000000095d91e45>] kthread+0x278/0x310 kernel/kthread.c:211
 [<00000000bb799d03>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:375
Code: 6c 82 be 01 00 00 00 48 c7 c7 e0 59 0d 83 e8 81 da b4 fe 49 8d be b0 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 35 01 00 00 45 8b be b0 02 
RIP  [<00000000436a8fca>] addrconf_rt_table+0x127/0x290 net/ipv6/addrconf.c:2226
 RSP <ffff8801980f7508>
---[ end trace 73ce70cb350151c4 ]---