[  671.990945] irq 52: nobody cared (try booting with the "irqpoll" option)
[  671.991020] CPU: 2 UID: 0 PID: 10238 Comm: perl Not tainted 7.3.0-rc5-virtme #1 PREEMPT(lazy) 
[  671.991023] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  671.991024] Call Trace:
[  671.991028]  <IRQ>
[  671.991030]  dump_stack_lvl+0x4d/0x70
[  671.991037]  __report_bad_irq+0x35/0xaa
[  671.991040]  note_interrupt.cold+0x1a/0x58
[  671.991042]  ? add_interrupt_randomness+0x53/0xe0
[  671.991046]  handle_irq_event+0x6e/0x70
[  671.991050]  handle_edge_irq+0xbf/0x180
[  671.991052]  __common_interrupt+0x40/0xd0
[  671.991056]  ? __sysvec_apic_timer_interrupt+0x52/0x100
[  671.991059]  common_interrupt+0x7a/0x90
[  671.991063]  </IRQ>
[  671.991063]  <TASK>
[  671.991064]  asm_common_interrupt+0x26/0x40
[  671.991066] RIP: 0010:_raw_spin_unlock_irqrestore+0x1d/0x30
[  671.991069] 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 b8 2c 01 <74> 01 c3 e8 4b c1 32 ff c3 66 2e 0f 1f 84 00 00 00 00 00 f3 0f 1e
[  671.991071] RSP: 0018:ff4175b00748bd40 EFLAGS: 00000286
[  671.991073] RAX: 00000000ffffffff RBX: ff30a13f02010000 RCX: 0000000000000017
[  671.991074] RDX: ffffffffa38c8d83 RSI: 0000000000000282 RDI: ffffffffa50a0920
[  671.991075] RBP: 0000000000000001 R08: 0000009c6fff5ee1 R09: 0000000000148006
[  671.991076] R10: ff4175b00748be68 R11: 0000000000000001 R12: ffffffffa50a0920
[  671.991076] R13: ff4175b00032f2a0 R14: ff30a13f0106c400 R15: 0000000000000282
[  671.991077]  ? rpm_suspend+0x153/0x610
[  671.991082]  uart_write+0xc8/0x2a0
[  671.991084]  n_tty_write+0x163/0x4f0
[  671.991087]  ? swake_up_all+0xf0/0xf0
[  671.991099]  file_tty_write.isra.0+0x14f/0x2f0
[  671.991101]  vfs_write+0x257/0x5b0
[  671.991106]  ksys_write+0x7b/0x110
[  671.991108]  do_syscall_64+0xcf/0x4a0
[  671.991110]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[  671.991112] RIP: 0033:0x7f672eb4c56e
[  671.991114] 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
[  671.991115] RSP: 002b:00007ffcbb24c870 EFLAGS: 00000202 ORIG_RAX: 0000000000000001
[  671.991117] RAX: ffffffffffffffda RBX: 000055d2e82e7550 RCX: 00007f672eb4c56e
[  671.991117] RDX: 0000000000000001 RSI: 000055d2e82e7550 RDI: 0000000000000001
[  671.991118] RBP: 00007ffcbb24c880 R08: 0000000000000000 R09: 0000000000000000
[  671.991118] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000001
[  671.991119] R13: 000055d2e82ae010 R14: 0000000000000001 R15: 000055d2e82e7550
[  671.991120]  </TASK>
[  671.991121] handlers:
[  671.992541] [<0000000096c5e9cb>] serial8250_interrupt
[  671.992573] Disabling IRQ #52