TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies.  Check SNMP counters.
TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies.  Check SNMP counters.
TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies.  Check SNMP counters.
TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies.  Check SNMP counters.
==================================================================
BUG: KASAN: stack-out-of-bounds in schedule_debug kernel/sched/core.c:3285 [inline]
BUG: KASAN: stack-out-of-bounds in __schedule+0x1977/0x1df0 kernel/sched/core.c:3395
Read of size 8 at addr ffff8801c8e38000 by task syz-executor0/6738

CPU: 0 PID: 6738 Comm: syz-executor0 Not tainted 4.19.0-rc1-next-20180830+ #52
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:

The buggy address belongs to the page:
page:ffffea0007238e00 count:1 mapcount:-512 mapping:0000000000000000 index:0x0
flags: 0x2fffc0000000000()
raw: 02fffc0000000000 dead000000000100 dead000000000200 0000000000000000
raw: 0000000000000000 0000000000000000 00000001fffffdff ffff8801b41be400
page dumped because: kasan: bad access detected
page->mem_cgroup:ffff8801b41be400

Memory state around the buggy address:
 ffff8801c8e37f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8801c8e37f80: 00 00 00 00 00 00 f1 f1 f1 f1 00 f2 f2 f2 f2 f2
>ffff8801c8e38000: f2 f2 04 f2 f2 f2 f2 f2 f2 f2 00 f2 f2 f2 00 00
                   ^
 ffff8801c8e38080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8801c8e38100: 00 00 00 00 f1 f1 f1 f1 00 f2 f2 f2 f2 f2 f2 f2
==================================================================
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 6738 Comm: syz-executor0 Tainted: G    B             4.19.0-rc1-next-20180830+ #52
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..