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: 14319 Comm: kworker/u4:8 Not tainted 4.9.205-syzkaller #0
Workqueue: netns cleanup_net
task: 00000000bd2d31bd task.stack: 00000000aad58c09
RIP: 0010:[<ffffffff826c4c07>]  [<00000000adfa7dd0>] addrconf_rt_table+0x127/0x290 net/ipv6/addrconf.c:2226
RSP: 0018:ffff8801ad85f508  EFLAGS: 00010206
RAX: dffffc0000000000 RBX: ffff88019faab300 RCX: 0000000000000004
RDX: 0000000000000056 RSI: 0000000000000000 RDI: 00000000000002b0
RBP: ffff8801ad85f538 R08: 0000000000000000 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000001 R12: 00000000000000fe
R13: 0000000000000200 R14: 0000000000000000 R15: ffff8801c9ec3d80
FS:  0000000000000000(0000) GS:ffff8801db700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000026291b0 CR3: 00000001d11d1000 CR4: 00000000001606b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffffffff826c4ae0 ffff8801aa062a00 ffff88019faab300 0000000000000000
 0000000000000080 ffff8801c9ec3d80 ffff8801ad85f580 ffffffff826c59f4
 0000000000000000 ffff8801aa062b90 ffff8801aa062a00 ffff8801aa062b90
Call Trace:
 [<00000000a14a99a1>] addrconf_get_prefix_route+0x34/0x270 net/ipv6/addrconf.c:2280
 [<000000003abefbf8>] __ipv6_ifa_notify+0x642/0x880 net/ipv6/addrconf.c:5520
 [<00000000b5566637>] addrconf_ifdown+0xa89/0x14d0 net/ipv6/addrconf.c:3692
 [<000000003a4f4237>] addrconf_notify+0x7ac/0x1f50 net/ipv6/addrconf.c:3496
 [<0000000098f09feb>] notifier_call_chain+0xb4/0x1d0 kernel/notifier.c:93
 [<0000000046938214>] __raw_notifier_call_chain kernel/notifier.c:394 [inline]
 [<0000000046938214>] raw_notifier_call_chain+0x2e/0x40 kernel/notifier.c:401
 [<0000000015eb6c7d>] call_netdevice_notifiers_info+0x56/0x70 net/core/dev.c:1647
 [<00000000de63fb38>] call_netdevice_notifiers net/core/dev.c:1663 [inline]
 [<00000000de63fb38>] rollback_registered_many+0x6ef/0xb50 net/core/dev.c:6863
 [<00000000987bd2ee>] unregister_netdevice_many.part.0+0x1b/0x1e0 net/core/dev.c:7912
 [<00000000ff9ae055>] unregister_netdevice_many+0x3b/0x50 net/core/dev.c:7911
 [<00000000dc390ec3>] ip_tunnel_delete_net+0x2b1/0x390 net/ipv4/ip_tunnel.c:1069
 [<000000009eb61ad4>] vti_exit_net+0x129/0x1f0 net/ipv4/ip_vti.c:499
 [<00000000ad73f3bb>] ops_exit_list.isra.0+0xb0/0x160 net/core/net_namespace.c:136
 [<000000008bef393f>] cleanup_net+0x3d6/0x8a0 net/core/net_namespace.c:474
 [<00000000c649ad61>] process_one_work+0x88b/0x1600 kernel/workqueue.c:2114
 [<00000000d1b8bbba>] worker_thread+0x5df/0x11d0 kernel/workqueue.c:2251
 [<00000000c143a319>] kthread+0x278/0x310 kernel/kthread.c:211
 [<000000008dea3c10>] 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  [<00000000adfa7dd0>] addrconf_rt_table+0x127/0x290 net/ipv6/addrconf.c:2226
 RSP <ffff8801ad85f508>
---[ end trace ef86f24d6fc979eb ]---