[ 1285.256036][    C3] irq 4: nobody cared (try booting with the "irqpoll" option)
[ 1285.256423][    C3] CPU: 3 UID: 0 PID: 4984 Comm: perl Not tainted 6.11.0-virtme #1
[ 1285.256676][    C3] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[ 1285.257060][    C3] Call Trace:
[ 1285.257465][    C3]  <IRQ>
[ 1285.257557][    C3]  dump_stack_lvl+0x82/0xd0
[ 1285.257740][    C3]  __report_bad_irq+0x5f/0x180
[ 1285.257916][    C3]  note_interrupt+0x6b3/0x860
[ 1285.258089][    C3]  handle_irq_event+0x16d/0x1c0
[ 1285.258259][    C3]  handle_edge_irq+0x1fa/0xb60
[ 1285.258435][    C3]  __common_interrupt+0x82/0x170
[ 1285.258607][    C3]  common_interrupt+0x81/0xa0
[ 1285.258780][    C3]  </IRQ>
[ 1285.258868][    C3]  <TASK>
[ 1285.258954][    C3]  asm_common_interrupt+0x26/0x40
[ 1285.259132][    C3] RIP: 0010:_raw_spin_unlock_irqrestore+0x43/0x70
[ 1285.259346][    C3] Code: 10 e8 01 ea 87 fd 48 89 ef e8 b9 5a 88 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 cc 3b 64 <74> 0e 5b 5d c3 cc cc cc cc e8 7f 3f ad fd eb dc 0f 1f 44 00 00 5b
[ 1285.259931][    C3] RSP: 0018:ffffc900010efaa0 EFLAGS: 00000286
[ 1285.260154][    C3] RAX: 0000000000000006 RBX: 0000000000000200 RCX: 1ffffffff3dfe0bf
[ 1285.260416][    C3] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff9bc7fd01
[ 1285.260673][    C3] RBP: ffffffff9f8b43e0 R08: 0000000000000001 R09: fffffbfff3df91d0
[ 1285.260931][    C3] R10: ffffffff9efc8e87 R11: 0000000000000000 R12: 00000000ffffffff
[ 1285.261173][    C3] R13: 0000000000000001 R14: ffffffff9f8b44e8 R15: 00000000ffffffff
[ 1285.261418][    C3]  ? _raw_spin_unlock_irqrestore+0x51/0x70
[ 1285.261622][    C3]  uart_write+0x220/0x920
[ 1285.261746][    C3]  process_output_block+0x13e/0x790
[ 1285.261903][    C3]  ? lockdep_hardirqs_on_prepare+0x275/0x410
[ 1285.262099][    C3]  n_tty_write+0x40c/0x790
[ 1285.262265][    C3]  ? __pfx_n_tty_write+0x10/0x10
[ 1285.262418][    C3]  ? trace_lock_acquire+0x14d/0x1f0
[ 1285.262574][    C3]  ? __pfx_woken_wake_function+0x10/0x10
[ 1285.262735][    C3]  ? iterate_tty_write+0x8f/0x540
[ 1285.262893][    C3]  ? lock_acquire+0x32/0xc0
[ 1285.263051][    C3]  ? iterate_tty_write+0x8f/0x540
[ 1285.263214][    C3]  iterate_tty_write+0x222/0x540
[ 1285.263373][    C3]  ? tty_ldisc_ref_wait+0x28/0x80
[ 1285.263546][    C3]  file_tty_write.constprop.0+0x1cf/0x360
[ 1285.263712][    C3]  vfs_write+0xa77/0x11d0
[ 1285.263838][    C3]  ? __pfx_do_raw_spin_lock+0x10/0x10
[ 1285.263993][    C3]  ? __pfx_vfs_write+0x10/0x10
[ 1285.264153][    C3]  ? _raw_spin_unlock_irq+0x28/0x50
[ 1285.264310][    C3]  ? tmigr_handle_remote+0x301/0x3f0
[ 1285.264471][    C3]  ? spin_bug+0x170/0x1d0
[ 1285.264598][    C3]  ksys_write+0xf5/0x1e0
[ 1285.264720][    C3]  ? __pfx_ksys_write+0x10/0x10
[ 1285.264873][    C3]  ? __local_bh_enable+0x80/0x90
[ 1285.265030][    C3]  ? handle_softirqs+0x32e/0x5c0
[ 1285.265191][    C3]  do_syscall_64+0xc1/0x1d0
[ 1285.265348][    C3]  entry_SYSCALL_64_after_hwframe+0x77/0x7f
[ 1285.265549][    C3] RIP: 0033:0x7fe296373957
[ 1285.265712][    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
[ 1285.266244][    C3] RSP: 002b:00007ffc394eaf58 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
[ 1285.266485][    C3] RAX: ffffffffffffffda RBX: 000055c635c232b0 RCX: 00007fe296373957
[ 1285.266718][    C3] RDX: 0000000000000001 RSI: 000055c635c232b0 RDI: 0000000000000001
[ 1285.266958][    C3] RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000002000
[ 1285.267203][    C3] R10: 0000000000000001 R11: 0000000000000246 R12: 000055c635c0e5e0
[ 1285.267430][    C3] R13: 000055c635bef2a0 R14: 0000000000000001 R15: 000055c635c0e5e0
[ 1285.267670][    C3]  </TASK>
[ 1285.267839][    C3] handlers:
[ 1285.267975][    C3] [<ffffffff9a567bf0>] serial8250_interrupt
[ 1285.268330][    C3] Disabling IRQ #4