Re: kernel bug in kvm_intel

[Avi Kivity <avi@redhat.com>]

On 10/12/2009 08:42 PM, Andrew Theurer wrote:
> On Sun, 2009-10-11 at 07:19 +0200, Avi Kivity wrote:
>    
>> On 10/09/2009 10:04 PM, Andrew Theurer wrote:
>>      
>>> This is on latest master branch on kvm.git and qemu-kvm.git, running
>>> 12 Windows Server2008 VMs, and using oprofile.  I ran again without
>>> oprofile and did not get the BUG.  I am wondering if anyone else is
>>> seeing this.
>>>
>>> Thanks,
>>>
>>> -Andrew
>>>
>>>        
>>>> Oct  9 11:55:13 virtvictory-eth0 kernel: BUG: unable to handle kernel
>>>> paging request at ffffffff9fe9a2b4
>>>> Oct  9 11:55:13 virtvictory-eth0 kernel: IP: [<ffffffffa02e1af1>]
>>>> vmx_vcpu_run+0x26d/0x64f [kvm_intel]
>>>>          
>> Can you run this through objdump or gdb to see what source this
>> corresponds to?
>>
>>      
> Somewhere here I think (?)
>
> objdump -d
>    


Look at the address where vmx_vcpu_run starts, add 0x26d, and show the 
surrounding code.

Thinking about it, it probably _is_ what you showed, due to module page 
alignment.  But please verify this; I can't reconcile the fault address 
(ffffffff9fe9a2b) with %rsp at the time of the fault.

-- 
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.