------------[ cut here ]------------
WARNING: CPU: 0 PID: 21176 at net/ipv4/tcp_input.c:890 tcp_update_reordering+0x224/0x280 net/ipv4/tcp_input.c:890
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 21176 Comm: syz-executor3 Not tainted 4.14.0-rc5+ #94
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:16 [inline]
 dump_stack+0x194/0x257 lib/dump_stack.c:52
 panic+0x1e4/0x417 kernel/panic.c:181
 __warn+0x1c4/0x1d9 kernel/panic.c:542
 report_bug+0x211/0x2d0 lib/bug.c:183
 fixup_bug+0x40/0x90 arch/x86/kernel/traps.c:178
 do_trap_no_signal arch/x86/kernel/traps.c:212 [inline]
 do_trap+0x260/0x390 arch/x86/kernel/traps.c:261
 do_error_trap+0x120/0x390 arch/x86/kernel/traps.c:298
 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:311
 invalid_op+0x18/0x20 arch/x86/entry/entry_64.S:905
RIP: 0010:tcp_update_reordering+0x224/0x280 net/ipv4/tcp_input.c:890
RSP: 0018:ffff8801d54df630 EFLAGS: 00010212
RAX: 0000000000010000 RBX: ffff8801c7090000 RCX: ffffc90004016000
RDX: 0000000000001041 RSI: ffffffff840ca7c4 RDI: ffff8801c7090000
RBP: ffff8801d54df648 R08: 0000000000000001 R09: 0000000000000002
R10: ffff8801c709096c R11: 00000000cf01b12b R12: 00000000fffffffd
R13: 0000000000000000 R14: dffffc0000000000 R15: ffff8801c7090000
 tcp_sacktag_write_queue+0x1760/0x2240 net/ipv4/tcp_input.c:1863
 tcp_ack+0x281b/0x5100 net/ipv4/tcp_input.c:3642
 tcp_rcv_state_process+0xc19/0x4850 net/ipv4/tcp_input.c:5903
 tcp_v4_do_rcv+0x55c/0x7d0 net/ipv4/tcp_ipv4.c:1490
 sk_backlog_rcv include/net/sock.h:912 [inline]
 __release_sock+0x124/0x360 net/core/sock.c:2266
 release_sock+0xa4/0x2a0 net/core/sock.c:2778
 inet_shutdown+0x1a8/0x350 net/ipv4/af_inet.c:853
 SYSC_shutdown net/socket.c:1904 [inline]
 SyS_shutdown+0x137/0x290 net/socket.c:1895
 entry_SYSCALL_64_fastpath+0x1f/0xbe
RIP: 0033:0x452869
RSP: 002b:00007f1ce6a63be8 EFLAGS: 00000212 ORIG_RAX: 0000000000000030
RAX: ffffffffffffffda RBX: 0000000000758020 RCX: 0000000000452869
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000014
RBP: 000000000000049a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f4f10
R13: 00000000ffffffff R14: 00007f1ce6a646d4 R15: 0000000000000000
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..