TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies.  Check SNMP counters.
WARNING: CPU: 1 PID: 30337 at lib/iov_iter.c:857 iov_iter_revert+0x2ee/0xaa0 lib/iov_iter.c:857
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 30337 Comm: syz-executor2 Not tainted 4.17.0-rc7+ #79
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1b9/0x294 lib/dump_stack.c:113
 panic+0x22f/0x4de kernel/panic.c:184
 __warn.cold.8+0x163/0x1b3 kernel/panic.c:536
 report_bug+0x252/0x2d0 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:178 [inline]
 do_error_trap+0x1de/0x490 arch/x86/kernel/traps.c:296
 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:315
 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:992
RIP: 0010:iov_iter_revert+0x2ee/0xaa0 lib/iov_iter.c:857
RSP: 0018:ffff880191c87788 EFLAGS: 00010216
RAX: 0000000000040000 RBX: 00000000ffffffff RCX: ffffc900030a9000
RDX: 0000000000000328 RSI: ffffffff8351b35e RDI: 0000000000000007
RBP: ffff880191c877e8 R08: ffff8801917fe4c0 R09: ffffed003b5e46d2
R10: 0000000000000003 R11: 0000000000000001 R12: 0000000000000001
R13: ffff880191c87ad0 R14: 0000000000003fff R15: ffff8801af540c80
 tls_sw_sendmsg+0xefc/0x12b0 net/tls/tls_sw.c:448
 inet_sendmsg+0x19f/0x690 net/ipv4/af_inet.c:798
 sock_sendmsg_nosec net/socket.c:629 [inline]
 sock_sendmsg+0xd5/0x120 net/socket.c:639
 sock_write_iter+0x35a/0x5a0 net/socket.c:908
 call_write_iter include/linux/fs.h:1784 [inline]
 new_sync_write fs/read_write.c:474 [inline]
 __vfs_write+0x64d/0x960 fs/read_write.c:487
 vfs_write+0x1f8/0x560 fs/read_write.c:549
 ksys_write+0xf9/0x250 fs/read_write.c:598
 __do_sys_write fs/read_write.c:610 [inline]
 __se_sys_write fs/read_write.c:607 [inline]
 __x64_sys_write+0x73/0xb0 fs/read_write.c:607
 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x455a09
RSP: 002b:00007f7fddda5c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f7fddda66d4 RCX: 0000000000455a09
RDX: 000000000000fe41 RSI: 00000000200001c0 RDI: 0000000000000013
RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000000007ab R14: 00000000007008a8 R15: 0000000000000000
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..