TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies.  Check SNMP counters.
invalid inflight: 1 state 5 cwnd 10 mss 21845
------------[ cut here ]------------
WARNING: CPU: 1 PID: 7635 at net/ipv4/tcp_output.c:2507 tcp_send_loss_probe.cold+0x83/0xa2 net/ipv4/tcp_output.c:2507
Kernel panic - not syncing: panic_on_warn set ...

kobject: 'loop5' (ffff8880a4b64160): kobject_uevent_env
CPU: 1 PID: 7635 Comm: syz-executor.0 Not tainted 4.14.145 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x138/0x197 lib/dump_stack.c:53
 panic+0x1f2/0x426 kernel/panic.c:182
 __warn.cold+0x2f/0x36 kernel/panic.c:546
 report_bug+0x216/0x254 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:177 [inline]
 fixup_bug arch/x86/kernel/traps.c:172 [inline]
 do_error_trap+0x1bb/0x310 arch/x86/kernel/traps.c:295
kobject: 'loop5' (ffff8880a4b64160): fill_kobj_path: path = '/devices/virtual/block/loop5'
 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:314
 invalid_op+0x1b/0x40 arch/x86/entry/entry_64.S:963
RIP: 0010:tcp_send_loss_probe.cold+0x83/0xa2 net/ipv4/tcp_output.c:2507
RSP: 0018:ffff8880aef07cb8 EFLAGS: 00010282
RAX: 000000000000002d RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000100 RSI: ffffffff866d10e0 RDI: ffffed1015de0f8d
RBP: ffff8880aef07ce8 R08: 000000000000002d R09: ffff888099cacf88
TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies.  Check SNMP counters.
R10: 0000000000000000 R11: 0000000000000000 R12: ffff88806d274240
R13: 0000000000000001 R14: 0000000000005555 R15: 000000000000000a
 tcp_write_timer_handler+0x4a8/0x7e0 net/ipv4/tcp_timer.c:575
 tcp_write_timer+0xd8/0x180 net/ipv4/tcp_timer.c:597
 call_timer_fn+0x161/0x670 kernel/time/timer.c:1279
 expire_timers kernel/time/timer.c:1318 [inline]
 __run_timers kernel/time/timer.c:1634 [inline]
 __run_timers kernel/time/timer.c:1602 [inline]
 run_timer_softirq+0x5b4/0x1570 kernel/time/timer.c:1647
 __do_softirq+0x244/0x9a0 kernel/softirq.c:288
 invoke_softirq kernel/softirq.c:368 [inline]
 irq_exit+0x160/0x1b0 kernel/softirq.c:409
 exiting_irq arch/x86/include/asm/apic.h:648 [inline]
 smp_apic_timer_interrupt+0x146/0x5e0 arch/x86/kernel/apic/apic.c:1102
 apic_timer_interrupt+0x96/0xa0 arch/x86/entry/entry_64.S:792
 </IRQ>
RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:169 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x54/0x90 kernel/locking/spinlock.c:200
RSP: 0018:ffff88806cc478a0 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff10
RAX: 1ffffffff0ee2a83 RBX: ffff888099cac6c0 RCX: 0000000000000000
RDX: dffffc0000000000 RSI: 0000000000000001 RDI: ffff888099cacf3c
RBP: ffff88806cc478a8 R08: ffff888099cac6c0 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880aef2c500
R13: ffff88809f708140 R14: ffff888095e5cc80 R15: ffff8880aef2ce58
 finish_lock_switch kernel/sched/sched.h:1350 [inline]
 finish_task_switch+0x178/0x650 kernel/sched/core.c:2674
 context_switch kernel/sched/core.c:2810 [inline]
 __schedule+0x7c0/0x1cd0 kernel/sched/core.c:3383
 schedule+0x92/0x1c0 kernel/sched/core.c:3427
 freezable_schedule include/linux/freezer.h:172 [inline]
 futex_wait_queue_me+0x2ec/0x5a0 kernel/futex.c:2625
 futex_wait+0x1f9/0x580 kernel/futex.c:2740
 do_futex+0x14a/0x19e0 kernel/futex.c:3663
 SYSC_futex kernel/futex.c:3723 [inline]
 SyS_futex+0x215/0x302 kernel/futex.c:3691
 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x459a09
RSP: 002b:00007ffee7acd9b8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00000000000003e8 RCX: 0000000000459a09
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000075bf2c
RBP: 000000000000002d R08: ffffffffffffffff R09: ffffffffffffffff
R10: 00007ffee7acda90 R11: 0000000000000246 R12: 000000000075bf20
R13: 00000000000238c4 R14: 00000000000238f1 R15: 000000000075bf2c
Kernel Offset: disabled
Rebooting in 86400 seconds..