======================================
| xx__-> echo $?
| 0
| xx__-> [ 1192.288758][ T6165] Mirror/redirect action on
| [ 1306.740785][    C3] irq 4: nobody cared (try booting with the "irqpoll" option)
[ 1306.741377][    C3] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[ 1306.741732][    C3] Call Trace:
[ 1306.741878][    C3]  <IRQ>
[ 1306.741961][ C3] dump_stack_lvl (lib/dump_stack.c:123) 
[ 1306.742138][ C3] __report_bad_irq (kernel/irq/spurious.c:214) 
[ 1306.742303][ C3] note_interrupt (kernel/irq/spurious.c:423) 
[ 1306.742465][ C3] handle_irq_event (kernel/irq/handle.c:198 kernel/irq/handle.c:210) 
[ 1306.742632][ C3] handle_edge_irq (kernel/irq/chip.c:833) 
[ 1306.742795][ C3] __common_interrupt (./include/linux/irqdesc.h:173 arch/x86/kernel/irq.c:247 arch/x86/kernel/irq.c:259 arch/x86/kernel/irq.c:285) 
[ 1306.742957][ C3] common_interrupt (arch/x86/kernel/irq.c:278 (discriminator 14)) 
[ 1306.743130][    C3]  </IRQ>
[ 1306.743213][    C3]  <TASK>
[ 1306.743298][ C3] asm_common_interrupt (./arch/x86/include/asm/idtentry.h:693) 
[ 1306.743473][ C3] RIP: 0010:_raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 1306.743680][ C3] Code: 10 e8 11 0b 88 fd 48 89 ef e8 29 7c 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 65 77 1b 6f <74> 0e 5b 5d c3 cc cc cc cc e8 5f 4c ad fd eb dc 0f 1f 44 00 00 5b
All code
========
   0:	10 e8                	adc    %ch,%al
   2:	11 0b                	adc    %ecx,(%rbx)
   4:	88 fd                	mov    %bh,%ch
   6:	48 89 ef             	mov    %rbp,%rdi
   9:	e8 29 7c 88 fd       	call   0xfffffffffd887c37
   e:	81 e3 00 02 00 00    	and    $0x200,%ebx
  14:	75 1d                	jne    0x33
  16:	9c                   	pushf
  17:	58                   	pop    %rax
  18:	f6 c4 02             	test   $0x2,%ah
  1b:	75 29                	jne    0x46
  1d:	48 85 db             	test   %rbx,%rbx
  20:	74 01                	je     0x23
  22:	fb                   	sti
  23:	65 ff 0d 65 77 1b 6f 	decl   %gs:0x6f1b7765(%rip)        # 0x6f1b778f
  2a:*	74 0e                	je     0x3a		<-- trapping instruction
  2c:	5b                   	pop    %rbx
  2d:	5d                   	pop    %rbp
  2e:	c3                   	ret
  2f:	cc                   	int3
  30:	cc                   	int3
  31:	cc                   	int3
  32:	cc                   	int3
  33:	e8 5f 4c ad fd       	call   0xfffffffffdad4c97
  38:	eb dc                	jmp    0x16
  3a:	0f 1f 44 00 00       	nopl   0x0(%rax,%rax,1)
  3f:	5b                   	pop    %rbx

Code starting with the faulting instruction
===========================================
   0:	74 0e                	je     0x10
   2:	5b                   	pop    %rbx
   3:	5d                   	pop    %rbp
   4:	c3                   	ret
   5:	cc                   	int3
   6:	cc                   	int3
   7:	cc                   	int3
   8:	cc                   	int3
   9:	e8 5f 4c ad fd       	call   0xfffffffffdad4c6d
   e:	eb dc                	jmp    0xffffffffffffffec
  10:	0f 1f 44 00 00       	nopl   0x0(%rax,%rax,1)
  15:	5b                   	pop    %rbx
[ 1306.744246][    C3] RSP: 0018:ffffc90000e5faa0 EFLAGS: 00000286
[ 1306.744461][    C3] RAX: 0000000000000006 RBX: 0000000000000200 RCX: 1ffffffff283e2bf
[ 1306.744693][    C3] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff90e851b1
[ 1306.744926][    C3] RBP: ffffffff94ab5420 R08: 0000000000000001 R09: fffffbfff28393d0
[ 1306.745173][    C3] R10: ffffffff941c9e87 R11: 0000000000000000 R12: 00000000ffffffff
[ 1306.745428][    C3] R13: 0000000000000001 R14: ffffffff94ab5528 R15: 00000000ffffffff
[ 1306.745686][ C3] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 1306.745890][ C3] uart_write (drivers/tty/serial/serial_core.c:74 drivers/tty/serial/serial_core.c:636) 
[ 1306.746015][ C3] process_output_block (drivers/tty/n_tty.c:574) 
[ 1306.746175][ C3] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406) 
[ 1306.746381][ C3] n_tty_write (drivers/tty/n_tty.c:2390) 
[ 1306.746559][ C3] ? __pfx_n_tty_write (drivers/tty/n_tty.c:2360) 
[ 1306.746720][ C3] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) 
[ 1306.746891][ C3] ? __pfx_woken_wake_function (kernel/sched/wait.c:439) 
[ 1306.747053][ C3] ? iterate_tty_write (drivers/tty/tty_io.c:948 drivers/tty/tty_io.c:967) 
[ 1306.747214][ C3] ? lock_acquire (kernel/locking/lockdep.c:5798) 
[ 1306.747383][ C3] ? iterate_tty_write (drivers/tty/tty_io.c:948 drivers/tty/tty_io.c:967) 
[ 1306.747547][ C3] iterate_tty_write (drivers/tty/tty_io.c:1015) 
[ 1306.747706][ C3] ? tty_ldisc_ref_wait (drivers/tty/tty_ldisc.c:244) 
[ 1306.747874][ C3] file_tty_write.constprop.0 (drivers/tty/tty_io.c:1090) 
[ 1306.748040][ C3] vfs_write (fs/read_write.c:590 fs/read_write.c:683) 
[ 1306.748177][ C3] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5790) 
[ 1306.748342][ C3] ? __pfx_vfs_write (fs/read_write.c:664) 
[ 1306.748506][ C3] ? clockevents_program_event (kernel/time/clockevents.c:326) 
[ 1306.748681][ C3] ? clockevents_program_event (kernel/time/clockevents.c:334 (discriminator 3)) 
[ 1306.748905][ C3] ksys_write (fs/read_write.c:736) 
[ 1306.749027][ C3] ? __pfx_ksys_write (fs/read_write.c:726) 
[ 1306.749193][ C3] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 1306.749363][ C3] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[ 1306.749557][    C3] RIP: 0033:0x7f45229c0957
[ 1306.749717][ 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
All code
========
   0:	0b 00                	or     (%rax),%eax
   2:	f7 d8                	neg    %eax
   4:	64 89 02             	mov    %eax,%fs:(%rdx)
   7:	48 c7 c0 ff ff ff ff 	mov    $0xffffffffffffffff,%rax
   e:	eb b7                	jmp    0xffffffffffffffc7
  10:	0f 1f 00             	nopl   (%rax)
  13:	f3 0f 1e fa          	endbr64
  17:	64 8b 04 25 18 00 00 	mov    %fs:0x18,%eax
  1e:	00 
  1f:	85 c0                	test   %eax,%eax
  21:	75 10                	jne    0x33
  23:	b8 01 00 00 00       	mov    $0x1,%eax
  28:	0f 05                	syscall
  2a:*	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax		<-- trapping instruction
  30:	77 51                	ja     0x83
  32:	c3                   	ret
  33:	48 83 ec 28          	sub    $0x28,%rsp
  37:	48 89 54 24 18       	mov    %rdx,0x18(%rsp)
  3c:	48                   	rex.W
  3d:	89                   	.byte 0x89
  3e:	74 24                	je     0x64

Code starting with the faulting instruction
===========================================
   0:	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax
   6:	77 51                	ja     0x59
   8:	c3                   	ret
   9:	48 83 ec 28          	sub    $0x28,%rsp
   d:	48 89 54 24 18       	mov    %rdx,0x18(%rsp)
  12:	48                   	rex.W
  13:	89                   	.byte 0x89
  14:	74 24                	je     0x3a
[ 1306.750273][    C3] RSP: 002b:00007fff7cebdb98 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
[ 1306.750527][    C3] RAX: ffffffffffffffda RBX: 000055dffbf442b0 RCX: 00007f45229c0957
[ 1306.750767][    C3] RDX: 0000000000000001 RSI: 000055dffbf442b0 RDI: 0000000000000001
[ 1306.751002][    C3] RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000002000
[ 1306.751231][    C3] R10: 0000000000000001 R11: 0000000000000246 R12: 000055dffbf2f5e0


Finger prints:
__report_bad_irq:note_interrupt:handle_irq_event:handle_edge_irq:__common_interrupt