invalid inflight: 1 state 4 cwnd 10 mss 1448
------------[ cut here ]------------
WARNING: CPU: 1 PID: 19009 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: 1 PID: 19009 Comm: syz-executor.1 Not tainted 4.14.143+ #0
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:ffff8881dbb07ca8 EFLAGS: 00010286
RAX: 000000000000002c RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff9c269f80 RDI: ffffed103b760f87
RBP: ffff8881b08a5e80 R08: 000000000000002c R09: ffffed103b764ce9
R10: ffffed103b764ce8 R11: ffff8881dbb26747 R12: 00000000000005a8
R13: 0000000000000001 R14: 000000000000000a R15: ffff8881b08a5e80
 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:__sanitizer_cov_trace_pc+0x29/0x60 kernel/kcov.c:74
RSP: 0018:ffff8881ca63f110 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff10
RAX: ffff8881afda5e00 RBX: 1ffff110394c7e29 RCX: 0000000000040000
RDX: 0000000000000001 RSI: ffffc90002147000 RDI: 00003ffffffff000
RBP: ffffffff9c88dec0 R08: 0000000000000001 R09: 0000000000000004
R10: fffffbfff3985ba5 R11: ffffffff9cc2dd2b R12: ffff8881c3856810
R13: ffff8881d5a124d8 R14: 00003ffffffff000 R15: ffff8881d5a12528
 do_anonymous_page mm/memory.c:3111 [inline]
 handle_pte_fault mm/memory.c:3987 [inline]
 __handle_mm_fault+0xb11/0x2700 mm/memory.c:4113
 handle_mm_fault+0x3c3/0x6da mm/memory.c:4150
 faultin_page mm/gup.c:514 [inline]
 __get_user_pages+0x348/0xe80 mm/gup.c:714
 __get_user_pages_locked mm/gup.c:885 [inline]
 __get_user_pages_unlocked mm/gup.c:999 [inline]
 get_user_pages_unlocked+0x1f5/0x310 mm/gup.c:1024
 get_user_pages_fast+0x1d7/0x240 mm/gup.c:1883
 iov_iter_get_pages+0x219/0xce0 lib/iov_iter.c:1081
 dio_refill_pages fs/direct-io.c:170 [inline]
 dio_get_page fs/direct-io.c:214 [inline]
 do_direct_IO fs/direct-io.c:982 [inline]
 do_blockdev_direct_IO fs/direct-io.c:1336 [inline]
 __blockdev_direct_IO+0x48fc/0xe24e fs/direct-io.c:1422
 ext4_direct_IO_write fs/ext4/inode.c:3716 [inline]
 ext4_direct_IO+0xa4f/0x2820 fs/ext4/inode.c:3869
 generic_file_direct_write+0x1e4/0x430 mm/filemap.c:3035
 __generic_file_write_iter+0x209/0x550 mm/filemap.c:3214
 ext4_file_write_iter+0x58f/0xdb0 fs/ext4/file.c:268
 call_write_iter include/linux/fs.h:1788 [inline]
 new_sync_write fs/read_write.c:471 [inline]
 __vfs_write+0x401/0x5a0 fs/read_write.c:484
 vfs_write+0x17f/0x4d0 fs/read_write.c:546
 SYSC_write fs/read_write.c:594 [inline]
 SyS_write+0x102/0x250 fs/read_write.c:586
 do_syscall_64+0x19b/0x520 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x4598e9
RSP: 002b:00007f47f8823c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000004598e9
RDX: 000000010000000d RSI: 0000000020000000 RDI: 0000000000000005
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f47f88246d4
R13: 00000000004c9a63 R14: 00000000004e1160 R15: 00000000ffffffff
Kernel Offset: 0x19400000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff)
Rebooting in 86400 seconds..