[  500.758968] tc (9908) used greatest stack depth: 11672 bytes left
[  511.631491] clocksource: Long readout interval, skipping watchdog check: cs_nsec: 1463904181 wd_nsec: 1463903639
[  545.264659] irq 51: nobody cared (try booting with the "irqpoll" option)
[  545.264742] CPU: 0 UID: 0 PID: 9819 Comm: perl Not tainted 6.19.0-rc3-virtme #1 PREEMPT(voluntary) 
[  545.264744] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  545.264746] Call Trace:
[  545.264749]  <IRQ>
[  545.264752]  dump_stack_lvl+0x4d/0x70
[  545.264759]  __report_bad_irq+0x35/0xb8
[  545.264761]  note_interrupt.cold+0x28/0x66
[  545.264762]  handle_irq_event+0x6e/0x80
[  545.264766]  handle_edge_irq+0xbc/0x180
[  545.264768]  __common_interrupt+0x40/0xd0
[  545.264770]  ? __sysvec_apic_timer_interrupt+0x52/0xf0
[  545.264772]  common_interrupt+0x7a/0x90
[  545.264776]  </IRQ>
[  545.264776]  <TASK>
[  545.264777]  asm_common_interrupt+0x26/0x40
[  545.264780] RIP: 0010:_raw_spin_unlock_irqrestore+0x1c/0x30
[  545.264783] Code: 00 66 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 ff 0d e4 c2 e8 00 <74> 01 c3 0f 1f 44 00 00 c3 66 66 2e 0f 1f 84 00 00 00 00 00 f3 0f
[  545.264784] RSP: 0018:ff54c0c74107bd38 EFLAGS: 00000286
[  545.264786] RAX: 00000000ffffffff RBX: ff1889ae41f68000 RCX: 0000000000000017
[  545.264787] RDX: ffffffff921ce8f5 RSI: 0000000000000282 RDI: ffffffff934c1680
[  545.264788] RBP: 0000000000000001 R08: 0000000000000001 R09: ff1889ae42fdd800
[  545.264788] R10: ff54c0c74107be68 R11: 0000000000000001 R12: ffffffff934c1680
[  545.264789] R13: ff54c0c740355000 R14: ff1889ae42fdd800 R15: 0000000000000282
[  545.264790]  ? rpm_suspend+0x185/0x5e0
[  545.264795]  uart_write+0xb4/0x270
[  545.264799]  n_tty_write+0x155/0x560
[  545.264801]  ? swake_up_all+0xd0/0xd0
[  545.264804]  file_tty_write.isra.0+0x15b/0x2a0
[  545.264805]  vfs_write+0x258/0x4d0
[  545.264809]  ? __hrtimer_run_queues+0x161/0x2a0
[  545.264812]  ksys_write+0x73/0xe0
[  545.264813]  do_syscall_64+0xa4/0xfc0
[  545.264815]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[  545.264816] RIP: 0033:0x7fd1c04bac5e
[  545.264818] Code: 4d 89 d8 e8 14 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 13 ff ff ff 0f 1f 00 f3 0f 1e fa
[  545.264818] RSP: 002b:00007ffc3898a530 EFLAGS: 00000202 ORIG_RAX: 0000000000000001
[  545.264820] RAX: ffffffffffffffda RBX: 0000555e90351140 RCX: 00007fd1c04bac5e
[  545.264820] RDX: 0000000000000001 RSI: 0000555e90351140 RDI: 0000000000000001
[  545.264820] RBP: 00007ffc3898a540 R08: 0000000000000000 R09: 0000000000000000
[  545.264821] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000001
[  545.264821] R13: 0000555e90312010 R14: 0000000000000001 R15: 0000555e90351140
[  545.264822]  </TASK>
[  545.264822] handlers:
[  545.266116] [<00000000ce0f4c5f>] serial8250_interrupt
[  545.266145] Disabling IRQ #51