[  878.510366][    C3] irq 4: nobody cared (try booting with the "irqpoll" option)
[  878.510720][    C3] CPU: 3 PID: 3683 Comm: perl Not tainted 6.8.0-virtme #1
[  878.510942][    C3] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[  878.511298][    C3] Call Trace:
[  878.511420][    C3]  <IRQ>
[  878.511506][    C3]  dump_stack_lvl+0x64/0xb0
[  878.511676][    C3]  __report_bad_irq+0x5f/0x180
[  878.511840][    C3]  note_interrupt+0x6b3/0x860
[  878.512000][    C3]  handle_irq_event+0x16d/0x1c0
[  878.512159][    C3]  handle_edge_irq+0x1fa/0xb60
[  878.512319][    C3]  __common_interrupt+0x7c/0x180
[  878.512477][    C3]  common_interrupt+0x7e/0x90
[  878.512638][    C3]  </IRQ>
[  878.512722][    C3]  <TASK>
[  878.512805][    C3]  asm_common_interrupt+0x26/0x40
[  878.512963][    C3] RIP: 0010:_raw_spin_unlock_irqrestore+0x43/0x70
[  878.513163][    C3] Code: 10 e8 31 9f a0 fd 48 89 ef e8 59 0b a1 fd 81 e3 00 02 00 00 75 1d 9c 58 f6 c4 02 75 29 48 85 db 74 01 fb 65 ff 0d 15 8a 15 61 <74> 0e 5b 5d c3 cc cc cc cc e8 af cc c3 fd eb dc 0f 1f 44 00 00 5b
[  878.513718][    C3] RSP: 0018:ffffc900017afa80 EFLAGS: 00000286
[  878.513924][    C3] RAX: 0000000000000006 RBX: 0000000000000200 RCX: 1ffffffff441cb22
[  878.514164][    C3] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff9eee3a81
[  878.514397][    C3] RBP: ffffffffa29c3f60 R08: 0000000000000001 R09: fffffbfff4417cb0
[  878.514668][    C3] R10: ffffffffa20be587 R11: 0000000000000000 R12: 00000000000002a7
[  878.514922][    C3] R13: ffffffffa29c4068 R14: ffffffffa29c3f60 R15: ffff8880049a0000
[  878.515178][    C3]  ? _raw_spin_unlock_irqrestore+0x51/0x70
[  878.515395][    C3]  uart_write+0x224/0x450
[  878.515532][    C3]  process_output_block+0x13e/0x790
[  878.515703][    C3]  ? lockdep_hardirqs_on_prepare.part.0+0x1af/0x370
[  878.515913][    C3]  n_tty_write+0x412/0x7a0
[  878.516091][    C3]  ? __pfx_n_tty_write+0x10/0x10
[  878.516256][    C3]  ? __pfx_woken_wake_function+0x10/0x10
[  878.516426][    C3]  ? lock_acquire+0x1c1/0x220
[  878.516589][    C3]  ? iterate_tty_write+0x95/0x540
[  878.516759][    C3]  iterate_tty_write+0x228/0x540
[  878.516933][    C3]  ? tty_ldisc_ref_wait+0x28/0x80
[  878.517111][    C3]  file_tty_write.constprop.0+0x1db/0x370
[  878.517283][    C3]  vfs_write+0x9e5/0x10a0
[  878.517410][    C3]  ? __pfx___lock_release+0x10/0x10
[  878.517579][    C3]  ? __pfx_lock_acquire.part.0+0x10/0x10
[  878.517744][    C3]  ? __pfx_vfs_write+0x10/0x10
[  878.517913][    C3]  ? clockevents_program_event+0xf6/0x300
[  878.518085][    C3]  ? ktime_get+0xb3/0x190
[  878.518219][    C3]  ? __fget_light+0x53/0x1e0
[  878.518398][    C3]  ? clockevents_program_event+0x1ea/0x300
[  878.518606][    C3]  ksys_write+0xf5/0x1e0
[  878.518733][    C3]  ? __pfx_ksys_write+0x10/0x10
[  878.518906][    C3]  do_syscall_64+0xc6/0x1e0
[  878.519075][    C3]  entry_SYSCALL_64_after_hwframe+0x6d/0x75
[  878.519279][    C3] RIP: 0033:0x7f07ac052957
[  878.519450][    C3] Code: 0b 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b7 0f 1f 00 f3 0f 1e fa 64 8b 04 25 18 00 00 00 85 c0 75 10 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 51 c3 48 83 ec 28 48 89 54 24 18 48 89 74 24
[  878.520050][    C3] RSP: 002b:00007fffbda6aaf8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
[  878.520305][    C3] RAX: ffffffffffffffda RBX: 00005595971e71b0 RCX: 00007f07ac052957
[  878.520567][    C3] RDX: 0000000000000001 RSI: 00005595971e71b0 RDI: 0000000000000001
[  878.520811][    C3] RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000002000
[  878.521057][    C3] R10: 0000000000000001 R11: 0000000000000246 R12: 00005595971d3590
[  878.521314][    C3] R13: 00005595971b42a0 R14: 0000000000000001 R15: 00005595971d3590
[  878.521571][    C3]  </TASK>
[  878.521696][    C3] handlers:
[  878.521823][    C3] [<ffffffff9d8ac2e0>] serial8250_interrupt
[  878.522405][    C3] Disabling IRQ #4

WAIT TIMEOUT stderr

Ctrl-C stderr

Ctrl-C stderr

WAIT TIMEOUT stderr