audit: type=1400 audit(1520026559.879:85): avc:  denied  { getopt } for  pid=24204 comm="syz-executor5" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_connector_socket permissive=1
Dead loop on virtual device tunl0, fix it urgently!
Kernel panic - not syncing: stack-protector: Kernel stack is corrupted in: 00000000808ef14e

CPU: 1 PID: 24234 Comm: syz-executor0 Not tainted 4.16.0-rc2+ #248
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x194/0x24d lib/dump_stack.c:53
 panic+0x1e4/0x41c kernel/panic.c:183
==================================================================
 __stack_chk_fail+0x22/0x30 kernel/panic.c:643
BUG: KASAN: use-after-free in memset include/linux/string.h:330 [inline]
BUG: KASAN: use-after-free in __unwind_start+0x2d/0x330 arch/x86/kernel/unwind_frame.c:389
 do_futex+0x1df8/0x22a0 kernel/futex.c:3552
Write of size 88 at addr ffff8801db1fe940 by task syz-executor4/24185

 SYSC_futex kernel/futex.c:3587 [inline]
 SyS_futex+0x260/0x390 kernel/futex.c:3555
 do_syscall_64+0x280/0x940 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x453d69
RSP: 002b:0000000000a3ea08 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 000000000002499e RCX: 0000000000453d69
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000000072becc
RBP: 000000000072becc R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000a3ea10 R11: 0000000000000246 R12: 0000000000000014
R13: ffffffffffffffff R14: 0000000000000000 R15: 0000000000000002
CPU: 0 PID: 24185 Comm: syz-executor4 Not tainted 4.16.0-rc2+ #248
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:

The buggy address belongs to the page:
page:ffffea00076c7f80 count:0 mapcount:0 mapping:0000000000000000 index:0x1
flags: 0x2fffc0000000000()
raw: 02fffc0000000000 0000000000000000 0000000000000001 00000000ffffffff
raw: dead000000000100 dead000000000200 0000000000000000 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801db1fe800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8801db1fe880: 00 00 00 00 00 ff ff ff ff ff ff ff ff ff ff ff
>ffff8801db1fe900: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                           ^
 ffff8801db1fe980: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8801db1fea00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..