Core dump: exception 12 or 13

Core dump: exception 12 or 13

[Ed Schofield]

Hi all,

I'm trying out kvm and running into problems reported as "exception
12" and "exception 13" and segfaults. I'm using a HP Compaq dc7700p
system with an Intel Q965 chipset running x86_64 Ubuntu Feisty.

When I try to run either kvm-16 included with Feisty or my own kvm-19
compiled from source, I get an exception like:

exception 13 (0)
rax 000000000000001f rbx 000000000006bffa rcx 0000000000033c25 rdx
0000000000000000
rsi 000000000006bffa rdi 000000000004ebf3 rsp 0000000000007bd6 rbp
000000000006bfe4
r8  0000000000000000 r9  0000000000000000 r10 0000000000000000 r11
0000000000000000
r12 0000000000000000 r13 0000000000000000 r14 0000000000000000 r15
0000000000000000
rip 000000000000145f rflags 00033046
cs 4004 (00040040/0000ffff p 1 dpl 3 db 0 s 1 type 3 l 0 g 0 avl 0)
ds 4004 (00040040/0000ffff p 1 dpl 3 db 0 s 1 type 3 l 0 g 0 avl 0)
es 0000 (00000000/0000ffff p 1 dpl 3 db 0 s 1 type 3 l 0 g 0 avl 0)
ss 0000 (00000000/0000ffff p 1 dpl 3 db 0 s 1 type 3 l 0 g 0 avl 0)
fs 0080 (00000800/0000ffff p 1 dpl 3 db 0 s 1 type 3 l 0 g 0 avl 0)
gs 0000 (00000000/0000ffff p 1 dpl 3 db 0 s 1 type 3 l 0 g 0 avl 0)
tr 0000 (18850000/00002088 p 1 dpl 0 db 0 s 0 type b l 0 g 0 avl 0)
ldt 0000 (00000000/0000ffff p 1 dpl 0 db 0 s 0 type 2 l 0 g 0 avl 0)
gdt 40620/f
idt 0/3ff
cr0 60000010 cr2 0 cr3 0 cr4 0 cr8 0 efer 0
Aborted (core dumped)

and lots of messages such as:
[77221.746966] rtc: lost some interrupts at 1024Hz.
in my syslog.

Similar symptoms have been reported by others as:
https://bugs.launchpad.net/ubuntu/+source/kvm/+bug/103665
and
https://bugs.launchpad.net/ubuntu/+source/kvm/+bug/107172

I should mention that kernels 2.6.19 and 2.6.20 seem to have a bug
that causes this machine (and 3 other identical machines) to lose
clock ticks at the rate of 3 seconds per minute. (This problem seems
to have been resolved in 2.6.21-rc5.) This may or may not be related
to the kvm problems.

I couldn't see any simple switch to configure to compile with debug
symbols, but if someone can tell me how to do this, I'll use gdb to
post a backtrace.

Is there anything else I can report to pinpoint the problem?

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Re: Core dump: exception 12 or 13

[Avi Kivity]

Ed Schofield wrote:
> Hi all,
>
> I'm trying out kvm and running into problems reported as "exception
> 12" and "exception 13" and segfaults. I'm using a HP Compaq dc7700p
> system with an Intel Q965 chipset running x86_64 Ubuntu Feisty.
>
> When I try to run either kvm-16 included with Feisty or my own kvm-19
> compiled from source, I get an exception like:
>
> exception 13 (0)
> rip 000000000000145f rflags 00033046
> cs 4004 (00040040/0000ffff p 1 dpl 3 db 0 s 1 type 3 l 0 g 0 avl 0)
> ds 4004 (00040040/0000ffff p 1 dpl 3 db 0 s 1 type 3 l 0 g 0 avl 0)
>
>   

[...]

> Is there anything else I can report to pinpoint the problem?
>
>   

This looks like our usual real-mode trouble.  What guest are you running?

-- 
error compiling committee.c: too many arguments to function


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Re: Core dump: exception 12 or 13

[Ed Schofield]

On 4/19/07, Avi Kivity <avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org> wrote:
> Ed Schofield wrote:
> > Hi all,
> >
> > I'm trying out kvm and running into problems reported as "exception
> > 12" and "exception 13" and segfaults. I'm using a HP Compaq dc7700p
> > system with an Intel Q965 chipset running x86_64 Ubuntu Feisty.
> >
> > When I try to run either kvm-16 included with Feisty or my own kvm-19
> > compiled from source, I get an exception like:
> >
> > exception 13 (0)
> > rip 000000000000145f rflags 00033046
> > cs 4004 (00040040/0000ffff p 1 dpl 3 db 0 s 1 type 3 l 0 g 0 avl 0)
> > ds 4004 (00040040/0000ffff p 1 dpl 3 db 0 s 1 type 3 l 0 g 0 avl 0)
> >
> >
>
> [...]
>
> > Is there anything else I can report to pinpoint the problem?
> >
> >
>
> This looks like our usual real-mode trouble.  What guest are you running?

Linux x86_64 (a Ubuntu Feisty prerelease boot CD from a few months
ago). I could try some other guests too if it would help.

Could you point to any links to useful info on this real-mode trouble?

-- Ed

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Re: Core dump: exception 12 or 13

[Avi Kivity]

Ed Schofield wrote:
>>
>> This looks like our usual real-mode trouble.  What guest are you 
>> running?
>
> Linux x86_64 (a Ubuntu Feisty prerelease boot CD from a few months
> ago). I could try some other guests too if it would help.
>
> Could you point to any links to useful info on this real-mode trouble?
>
> -- Ed

As it's a FAQ I added a page on the wiki:

  http://kvm.qumranet.com/kvmwiki/Intel_Real_Mode_Emulation_Problems

if anyone has more specific instructions for various guests, please add 
them there.

-- 
error compiling committee.c: too many arguments to function


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Re: Core dump: exception 12 or 13

[Ed Schofield]

On 4/19/07, Avi Kivity <avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org> wrote:
> Ed Schofield wrote:
> >>
> >> This looks like our usual real-mode trouble.  What guest are you
> >> running?
> >
> > Linux x86_64 (a Ubuntu Feisty prerelease boot CD from a few months
> > ago). I could try some other guests too if it would help.
> >
> > Could you point to any links to useful info on this real-mode trouble?
> >
> > -- Ed
>
> As it's a FAQ I added a page on the wiki:
>
>   http://kvm.qumranet.com/kvmwiki/Intel_Real_Mode_Emulation_Problems
>
> if anyone has more specific instructions for various guests, please add
> them there.

Ah, I'd missed that. Thanks a lot!

-- Ed

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Re: Core dump: exception 12 or 13

[Avi Kivity]

Ed Schofield wrote:
>>
>> As it's a FAQ I added a page on the wiki:
>>
>>   http://kvm.qumranet.com/kvmwiki/Intel_Real_Mode_Emulation_Problems
>>
>> if anyone has more specific instructions for various guests, please add
>> them there.
>
> Ah, I'd missed that. Thanks a lot!
>

It's new :)


-- 
error compiling committee.c: too many arguments to function


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