------------[ cut here ]------------
WARNING: CPU: 1 PID: 15336 at net/ipv4/tcp_input.c:889 tcp_update_reordering+0x224/0x280 net/ipv4/tcp_input.c:889
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 15336 Comm: syz-executor5 Not tainted 4.14.0-rc5-mm1+ #20
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+0x1e4/0x41c kernel/panic.c:183
 __warn+0x1c4/0x1e0 kernel/panic.c:546
 report_bug+0x211/0x2d0 lib/bug.c:183
 fixup_bug+0x40/0x90 arch/x86/kernel/traps.c:177
 do_trap_no_signal arch/x86/kernel/traps.c:211 [inline]
 do_trap+0x260/0x390 arch/x86/kernel/traps.c:260
 do_error_trap+0x120/0x390 arch/x86/kernel/traps.c:297
 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:310
 invalid_op+0x18/0x20 arch/x86/entry/entry_64.S:905
RIP: 0010:tcp_update_reordering+0x224/0x280 net/ipv4/tcp_input.c:889
RSP: 0018:ffff88019b24f630 EFLAGS: 00010212
RAX: 0000000000010000 RBX: ffff8801c64df500 RCX: ffffffff841965c4
RDX: 0000000000000ed1 RSI: ffffc900027de000 RDI: ffff8801c64df500
RBP: ffff88019b24f648 R08: 0000000000000001 R09: 0000000000000002
R10: ffff8801c64dfe64 R11: 000000007126dc65 R12: 00000000fffffffd
R13: 0000000000000000 R14: dffffc0000000000 R15: ffff8801c64df500
 tcp_sacktag_write_queue+0x1760/0x2240 net/ipv4/tcp_input.c:1862
 tcp_ack+0x281b/0x5100 net/ipv4/tcp_input.c:3640
 tcp_rcv_state_process+0xc19/0x4850 net/ipv4/tcp_input.c:5899
 tcp_v4_do_rcv+0x55c/0x7d0 net/ipv4/tcp_ipv4.c:1482
 sk_backlog_rcv include/net/sock.h:909 [inline]
 __release_sock+0x124/0x360 net/core/sock.c:2264
 release_sock+0xa4/0x2a0 net/core/sock.c:2776
 inet_shutdown+0x1a8/0x350 net/ipv4/af_inet.c:852
 SYSC_shutdown net/socket.c:1903 [inline]
 SyS_shutdown+0x137/0x290 net/socket.c:1894
 entry_SYSCALL_64_fastpath+0x1f/0xbe
RIP: 0033:0x452869
RSP: 002b:00007fe3a684bbe8 EFLAGS: 00000212 ORIG_RAX: 0000000000000030
RAX: ffffffffffffffda RBX: 0000000000758020 RCX: 0000000000452869
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000013
RBP: 0000000000000082 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f7a78
R13: 00000000ffffffff R14: 00007fe3a684c6d4 R15: 0000000000000000
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..