syzbot

audit: type=1400 audit(1543078772.570:9): avc:  denied  { map } for  pid=1837 comm="syz-execprog" path="/root/syzkaller-shm822419332" dev="sda1" ino=16482 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:file_t:s0 tclass=file 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 NOPTI
Modules linked in:
CPU: 1 PID: 64 Comm: kworker/u4:1 Not tainted 4.14.83+ #9
Workqueue: netns cleanup_net
task: ffff8801d9125e00 task.stack: ffff8801d91a0000
RIP: 0010:addrconf_rt_table+0x126/0x2a0 net/ipv6/addrconf.c:2292
RSP: 0018:ffff8801d91a76b8 EFLAGS: 00010206
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 1ffff1003b224cc4
RDX: 000000000000004d RSI: 0000000000000005 RDI: 0000000000000268
RBP: ffff8801d91a76e0 R08: 0000000000000001 R09: 0000000000000000
R10: ffff8801d91266d0 R11: 0000000000000001 R12: ffff8801c7e75500
R13: ffff8801c89c4000 R14: 00000000000001b8 R15: 00000000000000fe
FS:  0000000000000000(0000) GS:ffff8801db900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000004d96d0 CR3: 0000000038022006 CR4: 00000000001606a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 addrconf_get_prefix_route+0x30/0x2f0 net/ipv6/addrconf.c:2346
 __ipv6_ifa_notify+0x6b6/0x860 net/ipv6/addrconf.c:5597
 addrconf_ifdown+0xa20/0x12e0 net/ipv6/addrconf.c:3721
 addrconf_notify+0x8f1/0x1b30 net/ipv6/addrconf.c:3525
 notifier_call_chain+0x114/0x1b0 kernel/notifier.c:93
 call_netdevice_notifiers net/core/dev.c:1687 [inline]
 rollback_registered_many+0x6b5/0xac0 net/core/dev.c:7210
 unregister_netdevice_many+0x43/0x210 net/core/dev.c:8259
 default_device_exit_batch+0x313/0x3d0 net/core/dev.c:8718
 ops_exit_list.isra.3+0xfd/0x150 net/core/net_namespace.c:145
 cleanup_net+0x3e9/0x880 net/core/net_namespace.c:483
 process_one_work+0x86e/0x1670 kernel/workqueue.c:2114
 worker_thread+0xdc/0x1000 kernel/workqueue.c:2248
 kthread+0x348/0x420 kernel/kthread.c:232
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:402
Code: 6d 8f be 01 00 00 00 48 c7 c7 a0 e8 4c 90 e8 12 91 b2 fe 48 8d bb 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 3f 01 00 00 44 8b ab 68 02 
RIP: addrconf_rt_table+0x126/0x2a0 net/ipv6/addrconf.c:2292 RSP: ffff8801d91a76b8
---[ end trace 800bd0a1576fd8e9 ]---