======================================
| xx__-> echo $?
| 0
| xx__-> [  859.216203][T16914] Mirror/redirect action on
| [  902.878226][    C0] irq 51: nobody cared (try booting with the "irqpoll" option)
[  902.878850][    C0] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  902.878856][    C0] Call Trace:
[  902.878860][    C0]  <IRQ>
[ 902.878862][ C0] dump_stack_lvl (lib/dump_stack.c:123) 
[ 902.878892][ C0] __report_bad_irq (kernel/irq/spurious.c:170) 
[ 902.878908][ C0] note_interrupt (kernel/irq/spurious.c:372) 
[ 902.878916][ C0] handle_irq_event (kernel/irq/handle.c:198 kernel/irq/handle.c:210) 
[ 902.878925][ C0] handle_edge_irq (kernel/irq/chip.c:857) 
[ 902.878934][ C0] __common_interrupt (./include/asm-generic/irq_regs.h:28 arch/x86/kernel/irq.c:328) 
[ 902.878947][ C0] common_interrupt (arch/x86/kernel/irq.c:318 (discriminator 14)) 
[  902.878953][    C0]  </IRQ>
[  902.878954][    C0]  <TASK>
[ 902.878958][ C0] asm_common_interrupt (./arch/x86/include/asm/idtentry.h:693) 
[ 902.878967][ C0] RIP: 0010:_raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 902.878983][ C0] Code: 74 24 10 e8 71 2d 03 fe 48 89 ef e8 99 7c 03 fe 81 e3 00 02 00 00 75 25 9c 58 f6 c4 02 75 2d 48 85 db 74 01 fb bf 01 00 00 00 <e8> fa af f7 fd 65 8b 05 43 0e 0b 02 85 c0 74 0a 5b 5d c3 e8 f7 2f
All code
========
   0:	74 24                	je     0x26
   2:	10 e8                	adc    %ch,%al
   4:	71 2d                	jno    0x33
   6:	03 fe                	add    %esi,%edi
   8:	48 89 ef             	mov    %rbp,%rdi
   b:	e8 99 7c 03 fe       	call   0xfffffffffe037ca9
  10:	81 e3 00 02 00 00    	and    $0x200,%ebx
  16:	75 25                	jne    0x3d
  18:	9c                   	pushf
  19:	58                   	pop    %rax
  1a:	f6 c4 02             	test   $0x2,%ah
  1d:	75 2d                	jne    0x4c
  1f:	48 85 db             	test   %rbx,%rbx
  22:	74 01                	je     0x25
  24:	fb                   	sti
  25:	bf 01 00 00 00       	mov    $0x1,%edi
  2a:*	e8 fa af f7 fd       	call   0xfffffffffdf7b029		<-- trapping instruction
  2f:	65 8b 05 43 0e 0b 02 	mov    %gs:0x20b0e43(%rip),%eax        # 0x20b0e79
  36:	85 c0                	test   %eax,%eax
  38:	74 0a                	je     0x44
  3a:	5b                   	pop    %rbx
  3b:	5d                   	pop    %rbp
  3c:	c3                   	ret
  3d:	e8                   	.byte 0xe8
  3e:	f7 2f                	imull  (%rdi)

Code starting with the faulting instruction
===========================================
   0:	e8 fa af f7 fd       	call   0xfffffffffdf7afff
   5:	65 8b 05 43 0e 0b 02 	mov    %gs:0x20b0e43(%rip),%eax        # 0x20b0e4f
   c:	85 c0                	test   %eax,%eax
   e:	74 0a                	je     0x1a
  10:	5b                   	pop    %rbx
  11:	5d                   	pop    %rbp
  12:	c3                   	ret
  13:	e8                   	.byte 0xe8
  14:	f7 2f                	imull  (%rdi)
[  902.878986][    C0] RSP: 0018:ffffc900023a7a98 EFLAGS: 00000206
[  902.878992][    C0] RAX: 0000000000000002 RBX: 0000000000000200 RCX: 0000000000000040
[  902.878994][    C0] RDX: 0000000000000000 RSI: ffffffffa59c6264 RDI: 0000000000000001
[  902.878996][    C0] RBP: ffffffffa824b380 R08: 0000000000000001 R09: 0000000000000001
[  902.878998][    C0] R10: ffffffffa6812e17 R11: ffff888005fa8970 R12: 00000000ffffffff
[  902.878999][    C0] R13: 0000000000000001 R14: ffffffffa824b488 R15: 00000000ffffffff
[ 902.879016][ C0] uart_write (drivers/tty/serial/serial_core.c:74 drivers/tty/serial/serial_core.c:92 drivers/tty/serial/serial_core.c:88 drivers/tty/serial/serial_core.c:637) 
[ 902.879034][ C0] process_output_block (drivers/tty/n_tty.c:561) 
[ 902.879043][ C0] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 902.879050][ C0] n_tty_write (drivers/tty/n_tty.c:2378) 
[ 902.879052][ C0] ? _copy_from_iter (./arch/x86/include/asm/uaccess_64.h:126 ./arch/x86/include/asm/uaccess_64.h:141 lib/iov_iter.c:55 ./include/linux/iov_iter.h:30 ./include/linux/iov_iter.h:302 ./include/linux/iov_iter.h:330 lib/iov_iter.c:249 lib/iov_iter.c:260) 
[ 902.879069][ C0] ? n_tty_receive_signal_char (drivers/tty/n_tty.c:2348) 
[ 902.879075][ C0] ? __init_waitqueue_head (kernel/sched/wait.c:458) 
[ 902.879084][ C0] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5831) 
[ 902.879087][ C0] ? iterate_tty_write (drivers/tty/tty_io.c:939 drivers/tty/tty_io.c:958) 
[ 902.879101][ C0] iterate_tty_write (drivers/tty/tty_io.c:1007) 
[ 902.879108][ C0] ? tty_ldisc_ref_wait (drivers/tty/tty_ldisc.c:244) 
[ 902.879114][ C0] file_tty_write.constprop.0 (drivers/tty/tty_io.c:1081) 
[ 902.879122][ C0] vfs_write (fs/read_write.c:594 fs/read_write.c:686) 
[ 902.879134][ C0] ? find_held_lock (kernel/locking/lockdep.c:5350) 
[ 902.879139][ C0] ? kernel_write (fs/read_write.c:667) 
[ 902.879146][ C0] ? clockevents_program_event (kernel/time/clockevents.c:326) 
[ 902.879162][ C0] ? clockevents_program_event (kernel/time/clockevents.c:336 (discriminator 3)) 
[ 902.879169][ C0] ksys_write (fs/read_write.c:738) 
[ 902.879173][ C0] ? __ia32_sys_read (fs/read_write.c:728) 
[ 902.879184][ C0] do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94) 
[ 902.879189][ C0] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[  902.879192][    C0] RIP: 0033:0x7f8610996337
[ 902.879197][ C0] Code: 0f 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:	0f 00                	(bad)
   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
[  902.879199][    C0] RSP: 002b:00007ffecdecc578 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
[  902.879202][    C0] RAX: ffffffffffffffda RBX: 000055ed872162e0 RCX: 00007f8610996337
[  902.879203][    C0] RDX: 0000000000000001 RSI: 000055ed872162e0 RDI: 0000000000000001
[  902.879205][    C0] RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000002000
[  902.879206][    C0] R10: 0000000000000001 R11: 0000000000000246 R12: 000055ed87201600


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