TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies.  Check SNMP counters.
WARNING: CPU: 0 PID: 3670 at net/core/stream.c:206 sk_stream_kill_queues+0x3c5/0x520 net/core/stream.c:206
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 3670 Comm: syzkaller826509 Not tainted 4.15.0-rc7-next-20180115+ #97
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+0x194/0x257 lib/dump_stack.c:53
 panic+0x1e4/0x41c kernel/panic.c:183
 __warn+0x1dc/0x200 kernel/panic.c:547
 report_bug+0x211/0x2d0 lib/bug.c:184
 fixup_bug.part.11+0x37/0x80 arch/x86/kernel/traps.c:178
 fixup_bug arch/x86/kernel/traps.c:247 [inline]
 do_error_trap+0x2d7/0x3e0 arch/x86/kernel/traps.c:296
 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:315
 invalid_op+0x22/0x40 arch/x86/entry/entry_64.S:1085
RIP: 0010:sk_stream_kill_queues+0x3c5/0x520 net/core/stream.c:206
RSP: 0018:ffff8801bb61f5e0 EFLAGS: 00010293
RAX: ffff8801bbf242c0 RBX: ffff8801bd4e8040 RCX: ffffffff8439e2c5
RDX: 0000000000000000 RSI: 1ffff100376c3ea3 RDI: ffff8801bd4e8278
RBP: ffff8801bb61f620 R08: 1ffff100376c3e35 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000b00
R13: ffff8801bd4e8230 R14: ffffffff888cdca0 R15: ffff8801bd4e8178
 inet_csk_destroy_sock+0x175/0x3f0 net/ipv4/inet_connection_sock.c:834
 tcp_close+0x8ad/0xfc0 net/ipv4/tcp.c:2312
 tls_sk_proto_close+0x4f8/0x800 net/tls/tls_main.c:260
 inet_release+0xed/0x1c0 net/ipv4/af_inet.c:427
 inet6_release+0x50/0x70 net/ipv6/af_inet6.c:432
 sock_release+0x8d/0x1e0 net/socket.c:595
 sock_close+0x16/0x20 net/socket.c:1123
 __fput+0x327/0x7e0 fs/file_table.c:209
 ____fput+0x15/0x20 fs/file_table.c:243
 task_work_run+0x199/0x270 kernel/task_work.c:113
 exit_task_work include/linux/task_work.h:22 [inline]
 do_exit+0x9bb/0x1ad0 kernel/exit.c:869
 do_group_exit+0x149/0x400 kernel/exit.c:972
 SYSC_exit_group kernel/exit.c:983 [inline]
 SyS_exit_group+0x1d/0x20 kernel/exit.c:981
 entry_SYSCALL_64_fastpath+0x29/0xa0
RIP: 0033:0x43eef8
RSP: 002b:00007ffc5342cc88 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: ffffffffffffffff RCX: 000000000043eef8
RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000
RBP: 00000000006ca018 R08: 00000000000000e7 R09: ffffffffffffffd0
R10: 0000000020b0cffc R11: 0000000000000246 R12: 0000000000401c20
R13: 0000000000401cb0 R14: 0000000000000000 R15: 0000000000000000
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..