audit: type=1400 audit(2000000316.196:1902): avc:  denied  { write } for  pid=28560 comm="syz-executor.5" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_generic_socket permissive=1
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: 24118 Comm: kworker/u4:23 Not tainted 4.9.205-syzkaller #0
Workqueue: netns cleanup_net
task: 000000007761c4c6 task.stack: 00000000acc7eb9d
RIP: 0010:[<ffffffff826c4c07>]  [<000000009ac0ef42>] addrconf_rt_table+0x127/0x290 net/ipv6/addrconf.c:2226
RSP: 0018:ffff88019c9e7508  EFLAGS: 00010206
RAX: dffffc0000000000 RBX: ffff8801c524e600 RCX: 0000000000000004
RDX: 0000000000000056 RSI: 0000000000000000 RDI: 00000000000002b0
RBP: ffff88019c9e7538 R08: 0000000000000000 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000001 R12: 00000000000000fe
R13: 0000000000000200 R14: 0000000000000000 R15: ffff88019f800000
FS:  0000000000000000(0000) GS:ffff8801db700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c431e75000 CR3: 00000001d0134000 CR4: 00000000001606b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffffffff826c4ae0 ffff8801a7da9680 ffff8801c524e600 0000000000000000
 0000000000000080 ffff88019f800000 ffff88019c9e7580 ffffffff826c59f4
 0000000000000000 ffff8801a7da9810 ffff8801a7da9680 ffff8801a7da9810
Call Trace:
 [<000000004b4afa53>] addrconf_get_prefix_route+0x34/0x270 net/ipv6/addrconf.c:2280
 [<00000000ea2e76ae>] __ipv6_ifa_notify+0x642/0x880 net/ipv6/addrconf.c:5520
 [<000000005c5536ce>] addrconf_ifdown+0xa89/0x14d0 net/ipv6/addrconf.c:3692
 [<000000003ac05762>] addrconf_notify+0x7ac/0x1f50 net/ipv6/addrconf.c:3496
 [<00000000a759291c>] notifier_call_chain+0xb4/0x1d0 kernel/notifier.c:93
 [<0000000027c41f39>] __raw_notifier_call_chain kernel/notifier.c:394 [inline]
 [<0000000027c41f39>] raw_notifier_call_chain+0x2e/0x40 kernel/notifier.c:401
 [<000000003e343aab>] call_netdevice_notifiers_info+0x56/0x70 net/core/dev.c:1647
 [<00000000446b55d2>] call_netdevice_notifiers net/core/dev.c:1663 [inline]
 [<00000000446b55d2>] rollback_registered_many+0x6ef/0xb50 net/core/dev.c:6863
 [<00000000ed545225>] unregister_netdevice_many.part.0+0x1b/0x1e0 net/core/dev.c:7912
 [<00000000daa9b0c2>] unregister_netdevice_many+0x3b/0x50 net/core/dev.c:7911
 [<00000000832f037b>] ip_tunnel_delete_net+0x2b1/0x390 net/ipv4/ip_tunnel.c:1069
 [<00000000887d085e>] vti_exit_net+0x129/0x1f0 net/ipv4/ip_vti.c:499
 [<0000000054d70644>] ops_exit_list.isra.0+0xb0/0x160 net/core/net_namespace.c:136
 [<000000002670cfc4>] cleanup_net+0x3d6/0x8a0 net/core/net_namespace.c:474
 [<00000000ca290aa6>] process_one_work+0x88b/0x1600 kernel/workqueue.c:2114
 [<000000000931b68d>] worker_thread+0x5df/0x11d0 kernel/workqueue.c:2251
 [<0000000041406f6f>] kthread+0x278/0x310 kernel/kthread.c:211
 [<000000002af5aec7>] 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  [<000000009ac0ef42>] addrconf_rt_table+0x127/0x290 net/ipv6/addrconf.c:2226
 RSP <ffff88019c9e7508>
---[ end trace f6aa26fb20de5f09 ]---