[ 1265.668531][    C3] irq 4: nobody cared (try booting with the "irqpoll" option)
[ 1265.668926][    C3] CPU: 3 UID: 0 PID: 10687 Comm: perl Not tainted 6.12.0-rc3-virtme #1
[ 1265.669213][    C3] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[ 1265.669575][    C3] Call Trace:
[ 1265.669704][    C3]  <IRQ>
[ 1265.669804][    C3]  dump_stack_lvl+0x82/0xd0
[ 1265.669977][    C3]  __report_bad_irq+0x5f/0x180
[ 1265.670149][    C3]  note_interrupt+0x6b3/0x860
[ 1265.670331][    C3]  handle_irq_event+0x16d/0x1c0
[ 1265.670516][    C3]  handle_edge_irq+0x1fa/0xb60
[ 1265.670692][    C3]  __common_interrupt+0x82/0x170
[ 1265.670862][    C3]  common_interrupt+0x81/0xa0
[ 1265.671027][    C3]  </IRQ>
[ 1265.671110][    C3]  <TASK>
[ 1265.671194][    C3]  asm_common_interrupt+0x26/0x40
[ 1265.671383][    C3] RIP: 0010:_raw_spin_unlock_irqrestore+0x43/0x70
[ 1265.671589][    C3] Code: 10 e8 31 89 87 fd 48 89 ef e8 49 fa 87 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 c5 f6 fa 4e <74> 0e 5b 5d c3 cc cc cc cc e8 ff cb ac fd eb dc 0f 1f 44 00 00 5b
[ 1265.672164][    C3] RSP: 0018:ffffc900009bfaa0 EFLAGS: 00000286
[ 1265.672378][    C3] RAX: 0000000000000006 RBX: 0000000000000200 RCX: 1ffffffff687e90a
[ 1265.672617][    C3] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffffb108d211
[ 1265.672865][    C3] RBP: ffffffffb4cb83e0 R08: 0000000000000001 R09: fffffbfff68799d0
[ 1265.673112][    C3] R10: ffffffffb43cce87 R11: 0000000000000000 R12: 00000000ffffffff
[ 1265.673363][    C3] R13: 0000000000000001 R14: ffffffffb4cb84e8 R15: 00000000ffffffff
[ 1265.673621][    C3]  ? _raw_spin_unlock_irqrestore+0x51/0x70
[ 1265.673831][    C3]  uart_write+0x220/0x920
[ 1265.673964][    C3]  process_output_block+0x13e/0x790
[ 1265.674137][    C3]  ? lockdep_hardirqs_on_prepare+0x275/0x410
[ 1265.674340][    C3]  n_tty_write+0x40c/0x790
[ 1265.674508][    C3]  ? __pfx_n_tty_write+0x10/0x10
[ 1265.674671][    C3]  ? trace_lock_acquire+0x14d/0x1f0
[ 1265.674832][    C3]  ? __pfx_woken_wake_function+0x10/0x10
[ 1265.675009][    C3]  ? iterate_tty_write+0x8f/0x540
[ 1265.675169][    C3]  ? lock_acquire+0x32/0xc0
[ 1265.675329][    C3]  ? iterate_tty_write+0x8f/0x540
[ 1265.675502][    C3]  iterate_tty_write+0x222/0x540
[ 1265.675669][    C3]  ? tty_ldisc_ref_wait+0x28/0x80
[ 1265.675841][    C3]  file_tty_write.constprop.0+0x1cf/0x360
[ 1265.676003][    C3]  vfs_write+0xa77/0x11d0
[ 1265.676130][    C3]  ? __pfx___lock_release+0x10/0x10
[ 1265.676287][    C3]  ? trace_lock_acquire+0x14d/0x1f0
[ 1265.676448][    C3]  ? __might_fault+0xc3/0x170
[ 1265.676614][    C3]  ? lock_acquire+0x32/0xc0
[ 1265.676788][    C3]  ? __pfx_vfs_write+0x10/0x10
[ 1265.676954][    C3]  ? __might_fault+0x11b/0x170
[ 1265.677124][    C3]  ? lockdep_hardirqs_on_prepare+0x275/0x410
[ 1265.677335][    C3]  ksys_write+0xf5/0x1e0
[ 1265.677458][    C3]  ? __pfx_ksys_write+0x10/0x10
[ 1265.677626][    C3]  do_syscall_64+0xc1/0x1d0
[ 1265.677786][    C3]  entry_SYSCALL_64_after_hwframe+0x77/0x7f
[ 1265.677989][    C3] RIP: 0033:0x7f70f8c57957
[ 1265.678176][    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
[ 1265.678720][    C3] RSP: 002b:00007ffe5c00f268 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
[ 1265.678959][    C3] RAX: ffffffffffffffda RBX: 000055cf984be3f0 RCX: 00007f70f8c57957
[ 1265.679193][    C3] RDX: 0000000000000001 RSI: 000055cf984be3f0 RDI: 0000000000000001
[ 1265.679428][    C3] RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000002000
[ 1265.679657][    C3] R10: 0000000000000001 R11: 0000000000000246 R12: 000055cf984a95e0
[ 1265.679893][    C3] R13: 000055cf9848a2a0 R14: 0000000000000001 R15: 000055cf984a95e0
[ 1265.680143][    C3]  </TASK>
[ 1265.680264][    C3] handlers:
[ 1265.680385][    C3] [<ffffffffaf96e4f0>] serial8250_interrupt
[ 1265.680965][    C3] Disabling IRQ #4