invalid inflight: 1 state 4 cwnd 10 mss 21888
------------[ cut here ]------------
WARNING: CPU: 0 PID: 23345 at net/ipv4/tcp_output.c:2507 tcp_send_loss_probe.cold+0x7e/0x94 net/ipv4/tcp_output.c:2507
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 23345 Comm: kworker/u4:7 Not tainted 4.14.143+ #0
Workqueue: events_unbound flush_to_ldisc
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0xca/0x134 lib/dump_stack.c:53
 panic+0x1ea/0x3d3 kernel/panic.c:182
 __warn.cold+0x2f/0x3a kernel/panic.c:546
 report_bug+0x20a/0x248 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+0x1bf/0x2d0 arch/x86/kernel/traps.c:295
 invalid_op+0x18/0x40 arch/x86/entry/entry_64.S:963
RIP: 0010:tcp_send_loss_probe.cold+0x7e/0x94 net/ipv4/tcp_output.c:2507
RSP: 0018:ffff8881d7607ca8 EFLAGS: 00010286
RAX: 000000000000002d RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff8da69f80 RDI: ffffed103aec0f87
RBP: ffff8881a8cb8000 R08: 000000000000002d R09: ffffed103aec4ce9
R10: ffffed103aec4ce8 R11: ffff8881d7626747 R12: 0000000000005580
R13: 0000000000000001 R14: 000000000000000a R15: ffff8881a8cb8000
 tcp_write_timer_handler+0x46b/0x780 net/ipv4/tcp_timer.c:575
 tcp_write_timer+0xc9/0x170 net/ipv4/tcp_timer.c:597
 call_timer_fn+0x15b/0x6a0 kernel/time/timer.c:1279
 expire_timers+0x227/0x4c0 kernel/time/timer.c:1318
 __run_timers kernel/time/timer.c:1634 [inline]
 run_timer_softirq+0x1eb/0x5d0 kernel/time/timer.c:1647
 __do_softirq+0x234/0x9ec kernel/softirq.c:288
 invoke_softirq kernel/softirq.c:368 [inline]
 irq_exit+0x114/0x150 kernel/softirq.c:409
 exiting_irq arch/x86/include/asm/apic.h:648 [inline]
 smp_apic_timer_interrupt+0x1a7/0x650 arch/x86/kernel/apic/apic.c:1102
 apic_timer_interrupt+0x8c/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+0x2b/0x50 kernel/locking/spinlock.c:200
RSP: 0018:ffff88819b7bf860 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff10
RAX: 0000000000000007 RBX: 0000000000000402 RCX: 1ffff11038037703
RDX: 0000000000000000 RSI: ffff8881c01bb7f8 RDI: ffff8881c01bb72c
RBP: ffff8881d762a240 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8881d762a240
R13: ffff88819bfcc680 R14: ffff8881aa59bc80 R15: ffff8881c01baf00
 finish_lock_switch kernel/sched/sched.h:1491 [inline]
 finish_task_switch+0x204/0x660 kernel/sched/core.c:2733
 context_switch kernel/sched/core.c:2869 [inline]
 __schedule+0x894/0x1f80 kernel/sched/core.c:3454
 preempt_schedule_common+0x4f/0xd0 kernel/sched/core.c:3578
 ___preempt_schedule+0x16/0x18
 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:161 [inline]
 _raw_spin_unlock_irqrestore+0x65/0x70 kernel/locking/spinlock.c:192
 spin_unlock_irqrestore include/linux/spinlock.h:372 [inline]
 pty_write+0x146/0x1c0 drivers/tty/pty.c:125
 tty_put_char+0x129/0x150 drivers/tty/tty_io.c:2880
 __process_echoes+0x495/0x8c0 drivers/tty/n_tty.c:729
 flush_echoes drivers/tty/n_tty.c:829 [inline]
 __receive_buf drivers/tty/n_tty.c:1648 [inline]
 n_tty_receive_buf_common+0x923/0x2330 drivers/tty/n_tty.c:1742
 tty_ldisc_receive_buf+0xa0/0x170 drivers/tty/tty_buffer.c:455
 tty_port_default_receive_buf+0x6e/0xa0 drivers/tty/tty_port.c:37
 receive_buf drivers/tty/tty_buffer.c:475 [inline]
 flush_to_ldisc+0x1f9/0x3a0 drivers/tty/tty_buffer.c:527
 process_one_work+0x7f1/0x1580 kernel/workqueue.c:2134
 worker_thread+0xdd/0xdf0 kernel/workqueue.c:2271
 kthread+0x31f/0x430 kernel/kthread.c:232
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:404
Kernel Offset: 0xac00000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff)
Rebooting in 86400 seconds..