------------[ cut here ]------------
WARNING: CPU: 3 PID: 12092 at net/ipv4/tcp_input.c:867 tcp_update_reordering+0x257/0x2c0 net/ipv4/tcp_input.c:867
Kernel panic - not syncing: panic_on_warn set ...

CPU: 3 PID: 12092 Comm: syz-executor1 Not tainted 4.14.0-rc7-next-20171103+ #10
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 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+0x1c4/0x1e0 kernel/panic.c:546
 report_bug+0x211/0x2d0 lib/bug.c:184
 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:906
RIP: 0010:tcp_update_reordering+0x257/0x2c0 net/ipv4/tcp_input.c:867
RSP: 0018:ffff880056f4f600 EFLAGS: 00010212
RAX: 0000000000010000 RBX: ffff880057f76080 RCX: ffffffff843b7bf7
rfkill: input handler disabled
RDX: 0000000000001dfe RSI: ffffc900011c8000 RDI: ffff880057f76080
RBP: ffff880056f4f628 R08: 0000000000000001 R09: 1ffff1000ade9e69
R10: ffff880057f76a4c R11: 000000003439db32 R12: 00000000fffffff9
R13: 0000000000000001 R14: 0000000000000000 R15: ffff880057f76080
 tcp_sacktag_write_queue+0x1760/0x2240 net/ipv4/tcp_input.c:1840
device gre0 entered promiscuous mode
 tcp_ack+0x2837/0x5130 net/ipv4/tcp_input.c:3620
 tcp_rcv_state_process+0xcbd/0x48c0 net/ipv4/tcp_input.c:5911
 tcp_v6_do_rcv+0x739/0x11b0 net/ipv6/tcp_ipv6.c:1331
 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:853
 SYSC_shutdown net/socket.c:1903 [inline]
 SyS_shutdown+0x137/0x290 net/socket.c:1894
 entry_SYSCALL_64_fastpath+0x1f/0xbe
RIP: 0033:0x447c89
RSP: 002b:00007fdf53582bd8 EFLAGS: 00000246 ORIG_RAX: 0000000000000030
RAX: ffffffffffffffda RBX: 00007fdf535836cc RCX: 0000000000447c89
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 000000000000001e
RBP: 0000000000000086 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000000090d8 R14: 00000000006ed178 R15: 00007fdf53583700
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..