STABLE kernel panic: privileged instruction fault

[Alexey Tarasov]

Hello Kostik!

On Aug 16, 2010, at 10:48 PM, Kostik Belousov wrote:

>> 
> The backtrace make absolutely no sense. I would not trust kgdb anyway.
> 
> Compile ddb in and do backtrace in console on the panic. Also, disassemble
> the kernel at the fault address. I am very curious which instruction causes
> this. This is stock GENERIC on the bare metal booted, right ?

Yes, stock GENERIC.

Please, check this out:

Dump of assembler code from 0xffffff0060c0b700 to 0xffffff0060c0b780:
0xffffff0060c0b700:	add    %al,(%rax)
0xffffff0060c0b702:	add    %al,(%rax)
0xffffff0060c0b704:	add    %al,(%rax)
0xffffff0060c0b706:	add    %al,(%rax)
0xffffff0060c0b708:	add    %al,(%rax)
0xffffff0060c0b70a:	add    %al,(%rax)
0xffffff0060c0b70c:	add    %al,(%rax)
0xffffff0060c0b70e:	add    %al,(%rax)
0xffffff0060c0b710:	or     %dh,0xffffffffffffffc2(%rax)
0xffffff0060c0b713:	cmp    $0xff,%bh
0xffffff0060c0b716:	(bad)  
0xffffff0060c0b717:	incl   (%rax)
0xffffff0060c0b719:	add    %al,(%rcx)
0xffffff0060c0b71b:	add    %cl,%bh
0xffffff0060c0b71d:	pop    %rsp
0xffffff0060c0b71e:	out    %al,(%dx)
0xffffff0060c0b71f:	pop    %rdx
0xffffff0060c0b720:	or     $0x0,%al
0xffffff0060c0b722:	add    %al,(%rax)
0xffffff0060c0b724:	or     %al,%fs:(%rax)
0xffffff0060c0b727:	add    %ah,%bl
0xffffff0060c0b729:	int3   
0xffffff0060c0b72a:	(bad)  
0xffffff0060c0b72b:	add    %cl,%bh
0xffffff0060c0b72d:	pop    %rsp
0xffffff0060c0b72e:	out    %al,(%dx)
0xffffff0060c0b72f:	pop    %rdx
0xffffff0060c0b730:	iret   
0xffffff0060c0b731:	pop    %rsp
0xffffff0060c0b732:	out    %al,(%dx)
0xffffff0060c0b733:	pop    %rdx
0xffffff0060c0b734:	rex xor    $0x9f105aee,%eax
0xffffff0060c0b73a:	add    %al,(%rax)
0xffffff0060c0b73c:	add    %al,(%rax)
0xffffff0060c0b73e:	add    %al,(%rax)
0xffffff0060c0b740:	rex pop    %rdi
0xffffff0060c0b742:	retq   $0xff80
0xffffff0060c0b745:	(bad)  
0xffffff0060c0b746:	(bad)  
0xffffff0060c0b747:	incl   (%rax)
0xffffff0060c0b749:	push   %rax
0xffffff0060c0b74a:	loop   0xffffff0060c0b78e
0xffffff0060c0b74c:	add    %bh,%bh
0xffffff0060c0b74e:	(bad)  
0xffffff0060c0b74f:	incl   (%rax)
0xffffff0060c0b751:	add    %al,(%rax)
0xffffff0060c0b753:	add    %al,(%rax)
0xffffff0060c0b755:	add    %al,(%rax)
0xffffff0060c0b757:	add    %dl,(%rax)
0xffffff0060c0b759:	push   %rax
0xffffff0060c0b75a:	loop   0xffffff0060c0b79e
0xffffff0060c0b75c:	add    %bh,%bh
0xffffff0060c0b75e:	(bad)  
0xffffff0060c0b75f:	incl   (%rax)
0xffffff0060c0b761:	add    %al,(%rax)
0xffffff0060c0b763:	add    %al,(%rax)
0xffffff0060c0b765:	add    %al,(%rax)
0xffffff0060c0b767:	add    %bl,%al
0xffffff0060c0b769:	pop    %rdi
0xffffff0060c0b76a:	retq   $0xff80
0xffffff0060c0b76d:	(bad)  
0xffffff0060c0b76e:	(bad)  
0xffffff0060c0b76f:	incl   (%rax)
0xffffff0060c0b771:	add    %al,(%rax)
0xffffff0060c0b773:	add    %al,(%rax)
0xffffff0060c0b775:	add    %al,(%rax)
0xffffff0060c0b777:	add    %al,0x290c55(%rax)
0xffffff0060c0b77d:	(bad)  
0xffffff0060c0b77e:	(bad)  
0xffffff0060c0b77f:	incl   (%rax)


--
Alexey Tarasov

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