------------[ cut here ]------------
WARNING: CPU: 1 PID: 21438 at net/ipv4/tcp_timer.c:429 tcp_retransmit_timer+0x1a66/0x2590 net/ipv4/tcp_timer.c:429
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 21438 Comm: syz-executor.5 Not tainted 4.14.145+ #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_retransmit_timer+0x1a66/0x2590 net/ipv4/tcp_timer.c:429
RSP: 0018:ffff8881db907c78 EFLAGS: 00010206
RAX: ffff8881ad130000 RBX: ffff8881a9eed880 RCX: 0000000000000001
RDX: 0000000000000100 RSI: 0000000000000000 RDI: ffff8881a33756c8
RBP: ffff8881a3374d00 R08: ffff88821ffff05c R09: ffff88821ffff048
R10: ffff88821ffff057 R11: ffff88821ffff050 R12: ffff8881a337539a
R13: ffff8881a3374d30 R14: 0000000000000000 R15: ffff8881a337550c
 tcp_write_timer_handler+0x43d/0x780 net/ipv4/tcp_timer.c:579
 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:__blk_mq_get_tag+0x218/0x2e0 block/blk-mq-tag.c:99
RSP: 0018:ffff8881a653f690 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff10
RAX: 0000000000000000 RBX: ffff8881a653f8d8 RCX: 1ffffffff1e8227e
RDX: 1ffff11034ca7f1c RSI: ffff8881d70c7010 RDI: ffff8881a653f8e0
RBP: ffff8881d70c7010 R08: 0000000000000001 R09: 0000000000000003
R10: fffffbfff1ec5b9d R11: ffffffff8f62dceb R12: ffff8881d70c7010
R13: 0000000000000004 R14: ffff8881a653f8f0 R15: ffff8881d8dced00
 blk_mq_get_tag+0x1b3/0xa60 block/blk-mq-tag.c:127
 blk_mq_get_request+0x423/0x1350 block/blk-mq.c:382
 blk_mq_make_request+0x2d3/0x19c0 block/blk-mq.c:1669
 generic_make_request block/blk-core.c:2227 [inline]
 generic_make_request+0x212/0x880 block/blk-core.c:2171
 submit_bio+0xa7/0x390 block/blk-core.c:2301
 submit_bh_wbc.isra.0+0x45c/0x600 fs/buffer.c:3152
 submit_bh fs/buffer.c:3158 [inline]
 __sync_dirty_buffer+0xda/0x1e0 fs/buffer.c:3244
 __ext4_handle_dirty_metadata+0x169/0x480 fs/ext4/ext4_jbd2.c:300
 ext4_delete_entry+0x2fe/0x460 fs/ext4/namei.c:2418
 ext4_unlink+0x5ea/0xfd0 fs/ext4/namei.c:3091
 vfs_unlink2+0x23c/0x470 fs/namei.c:4157
 do_unlinkat+0x327/0x5e0 fs/namei.c:4228
 do_syscall_64+0x19b/0x520 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x459757
RSP: 002b:00007ffc84ec4288 EFLAGS: 00000246 ORIG_RAX: 0000000000000057
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000459757
RDX: 00007ffc84ec42a0 RSI: 00007ffc84ec42a0 RDI: 00007ffc84ec4330
RBP: 0000000000000227 R08: 0000000000000000 R09: 0000000000000010
R10: 000000000000000a R11: 0000000000000246 R12: 00007ffc84ec53c0
R13: 0000000002898940 R14: 0000000000000000 R15: 00007ffc84ec53c0
Kernel Offset: 0xbe00000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff)
Rebooting in 86400 seconds..