[  719.308911] irq 52: nobody cared (try booting with the "irqpoll" option)
[  719.308978] CPU: 2 UID: 0 PID: 10550 Comm: perl Not tainted 7.3.0-rc5-virtme #1 PREEMPT(lazy) 
[  719.308980] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  719.308982] Call Trace:
[  719.308985]  <IRQ>
[  719.308987]  dump_stack_lvl+0x4d/0x70
[  719.308993]  __report_bad_irq+0x35/0xaa
[  719.308995]  note_interrupt.cold+0x1a/0x58
[  719.308996]  ? add_interrupt_randomness+0x53/0xe0
[  719.309000]  handle_irq_event+0x6e/0x70
[  719.309003]  handle_edge_irq+0xbf/0x180
[  719.309005]  __common_interrupt+0x40/0xd0
[  719.309008]  ? __sysvec_apic_timer_interrupt+0x52/0x100
[  719.309010]  common_interrupt+0x7a/0x90
[  719.309014]  </IRQ>
[  719.309014]  <TASK>
[  719.309015]  asm_common_interrupt+0x26/0x40
[  719.309017] RIP: 0010:_raw_spin_unlock_irqrestore+0x1d/0x30
[  719.309020] Code: 00 90 66 66 2e 0f 1f 84 00 00 00 00 00 f3 0f 1e fa 0f 1f 44 00 00 c6 07 00 f7 c6 00 02 00 00 74 01 fb 65 48 ff 0d db a8 2c 01 <74> 01 c3 e8 4b c1 32 ff c3 66 2e 0f 1f 84 00 00 00 00 00 f3 0f 1e
[  719.309022] RSP: 0018:ff6a193f0822fd40 EFLAGS: 00000286
[  719.309023] RAX: 00000000ffffffff RBX: ff16aad1c1fa4000 RCX: 0000000000000017
[  719.309024] RDX: ffffffff8e2c8dc3 RSI: 0000000000000282 RDI: ffffffff8fa9f920
[  719.309025] RBP: 0000000000000001 R08: 000000a75e884395 R09: 000000000015f142
[  719.309025] R10: ff6a193f0822fe68 R11: 0000000000000001 R12: ffffffff8fa9f920
[  719.309026] R13: ff6a193f003372a0 R14: ff16aad1c106d000 R15: 0000000000000282
[  719.309026]  ? rpm_suspend+0x153/0x610
[  719.309030]  uart_write+0xc8/0x2a0
[  719.309032]  n_tty_write+0x163/0x4f0
[  719.309034]  ? swake_up_all+0xf0/0xf0
[  719.309037]  file_tty_write.isra.0+0x14f/0x2f0
[  719.309038]  vfs_write+0x257/0x5b0
[  719.309042]  ksys_write+0x7b/0x110
[  719.309043]  do_syscall_64+0xcf/0x4a0
[  719.309045]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[  719.309046] RIP: 0033:0x7f6560e3156e
[  719.309047] Code: 4d 89 d8 e8 d4 bd 00 00 4c 8b 5d f8 41 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 11 c9 c3 0f 1f 80 00 00 00 00 48 8b 45 10 0f 05 <c9> c3 83 e2 39 83 fa 08 75 e7 e8 03 ff ff ff 0f 1f 00 f3 0f 1e fa
[  719.309048] RSP: 002b:00007ffee7ad5400 EFLAGS: 00000202 ORIG_RAX: 0000000000000001
[  719.309049] RAX: ffffffffffffffda RBX: 00005562fa2be670 RCX: 00007f6560e3156e
[  719.309049] RDX: 0000000000000001 RSI: 00005562fa2be670 RDI: 0000000000000001
[  719.309050] RBP: 00007ffee7ad5410 R08: 0000000000000000 R09: 0000000000000000
[  719.309050] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000001
[  719.309050] R13: 00005562fa285010 R14: 0000000000000001 R15: 00005562fa2be670
[  719.309051]  </TASK>
[  719.309052] handlers:
[  719.310417] [<00000000a5756672>] serial8250_interrupt
[  719.310449] Disabling IRQ #52