[ 1721.489511][    C3] irq 4: nobody cared (try booting with the "irqpoll" option)
[ 1721.489980][    C3] CPU: 3 UID: 0 PID: 8236 Comm: perl Not tainted 6.11.0-rc1-virtme #1
[ 1721.490217][    C3] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[ 1721.490565][    C3] Call Trace:
[ 1721.490687][    C3]  <IRQ>
[ 1721.490775][    C3]  dump_stack_lvl+0x82/0xd0
[ 1721.490960][    C3]  __report_bad_irq+0x5f/0x180
[ 1721.491124][    C3]  note_interrupt+0x6b3/0x860
[ 1721.491288][    C3]  handle_irq_event+0x16d/0x1c0
[ 1721.491447][    C3]  handle_edge_irq+0x1fa/0xb60
[ 1721.491619][    C3]  __common_interrupt+0x82/0x170
[ 1721.491784][    C3]  common_interrupt+0x7e/0x90
[ 1721.491950][    C3]  </IRQ>
[ 1721.492056][    C3]  <TASK>
[ 1721.492143][    C3]  asm_common_interrupt+0x26/0x40
[ 1721.492313][    C3] RIP: 0010:_raw_spin_unlock_irqrestore+0x43/0x70
[ 1721.492530][    C3] Code: 10 e8 31 9a 8d fd 48 89 ef e8 d9 0a 8e 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 d5 d8 c1 46 <74> 0e 5b 5d c3 cc cc cc cc e8 4f c2 b1 fd eb dc 0f 1f 44 00 00 5b
[ 1721.493092][    C3] RSP: 0018:ffffc900008afab8 EFLAGS: 00000286
[ 1721.493300][    C3] RAX: 0000000000000006 RBX: 0000000000000200 RCX: 1ffffffff78f7610
[ 1721.493541][    C3] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffffb941efc1
[ 1721.493780][    C3] RBP: ffffffffbd07c320 R08: 0000000000000001 R09: fffffbfff78f2708
[ 1721.494013][    C3] R10: ffffffffbc793847 R11: 0000000000000000 R12: ffffffffbd07c428
[ 1721.494257][    C3] R13: ffff888007b45800 R14: ffffffffbd07c320 R15: 0000000000000282
[ 1721.494506][    C3]  ? _raw_spin_unlock_irqrestore+0x51/0x70
[ 1721.494714][    C3]  uart_write+0x13e/0x320
[ 1721.494851][    C3]  process_output_block+0x13e/0x790
[ 1721.495011][    C3]  ? lockdep_hardirqs_on_prepare+0x275/0x410
[ 1721.495211][    C3]  n_tty_write+0x412/0x7a0
[ 1721.495382][    C3]  ? __pfx_n_tty_write+0x10/0x10
[ 1721.495554][    C3]  ? trace_lock_acquire+0x14d/0x1f0
[ 1721.495715][    C3]  ? __pfx_woken_wake_function+0x10/0x10
[ 1721.495880][    C3]  ? iterate_tty_write+0x95/0x540
[ 1721.496040][    C3]  ? lock_acquire+0x32/0xc0
[ 1721.496196][    C3]  ? iterate_tty_write+0x95/0x540
[ 1721.496361][    C3]  iterate_tty_write+0x228/0x540
[ 1721.496519][    C3]  ? tty_ldisc_ref_wait+0x28/0x80
[ 1721.496682][    C3]  file_tty_write.constprop.0+0x1db/0x370
[ 1721.496847][    C3]  vfs_write+0xa1b/0x10b0
[ 1721.496975][    C3]  ? __pfx_lock_acquire.part.0+0x10/0x10
[ 1721.497135][    C3]  ? __pfx_vfs_write+0x10/0x10
[ 1721.497298][    C3]  ? clockevents_program_event+0xf6/0x300
[ 1721.497464][    C3]  ? __fget_light+0x53/0x1e0
[ 1721.497630][    C3]  ksys_write+0xf5/0x1e0
[ 1721.497751][    C3]  ? __pfx_ksys_write+0x10/0x10
[ 1721.497920][    C3]  do_syscall_64+0xc1/0x1d0
[ 1721.498077][    C3]  entry_SYSCALL_64_after_hwframe+0x77/0x7f
[ 1721.498270][    C3] RIP: 0033:0x7f3c11dc1957
[ 1721.498431][    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
[ 1721.498978][    C3] RSP: 002b:00007ffe503fb6e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
[ 1721.499216][    C3] RAX: ffffffffffffffda RBX: 000055d9390f51d0 RCX: 00007f3c11dc1957
[ 1721.499458][    C3] RDX: 0000000000000001 RSI: 000055d9390f51d0 RDI: 0000000000000001
[ 1721.499700][    C3] RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000002000
[ 1721.499928][    C3] R10: 0000000000000001 R11: 0000000000000246 R12: 000055d9390e15c0
[ 1721.500165][    C3] R13: 000055d9390c22a0 R14: 0000000000000001 R15: 000055d9390e15c0
[ 1721.500421][    C3]  </TASK>
[ 1721.500585][    C3] handlers:
[ 1721.500703][    C3] [<ffffffffb7d1db60>] serial8250_interrupt
[ 1721.501096][    C3] Disabling IRQ #4