RE: [Xen-devel] Re: Reproducable data corruption on xen-unstable

["Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx>]

The vm86 'Oops' should now be fixed, although it's not Robin's real
problem.

Ian 

> -----Original Message-----
> From: Rik van Riel [mailto:riel@xxxxxxxxxx] 
> Sent: 04 February 2005 02:27
> To: Ian Pratt
> Cc: Robin Green; xen-devel@xxxxxxxxxxxxxxxxxxxxx
> Subject: RE: [Xen-devel] Re: Reproducable data corruption on 
> xen-unstable
> 
> On Fri, 4 Feb 2005, Ian Pratt wrote:
> 
> > (vm86 is not widely used, so I can belive we could have 
> lurking bugs on 
> > that path).
> 
> Confirmed, by running Dave Jones's scrashme program, inside a
> xenU domain with 32 virtual CPUs:
> 
> vm86: could not access userspace vm86_info
> Unable to handle kernel paging request at virtual address 000171d3
>   printing eip:
> 0000ec83
> *pde = ma 308ac067 pa 01709067
> *pte = ma 00000000 pa 55555000
>   [<c0108d4b>] syscall_call+0x7/0xb
> Oops: 0000 [#2]
> SMP
> Modules linked in: nfs lockd md5 ipv6 autofs4 sunrpc dm_mod
> CPU:    0
> EIP:    0855:[<0000ec83>]    Not tainted VLI
> EFLAGS: 00030f42   (2.6.10-1.1121_FC4xenU)
> EIP is at 0xec83
> eax: 64e9000b   ebx: 0038cc83   ecx: 2cd0e800   edx: 1ee9000b
> esi: 8dffffff   edi: 0038cc83   ebp: 2cc0e800   esp: c62fdf24
> ds: 0000   es: 0000   ss: 0069
> Process scrashme (pid: 19875, threadinfo=c62fc000 task=c82fd020)
> Stack: 104613c3 00008d00 00000003 00000fc2 00000001 00006693 
> 31ff31ff f05589f6
>         0026b48d 8d000000 000027bc fe830000 8b187406 448b084d 
> 453b40b1 890c74f0
>         07e82404 8d00047f 4601387c 7e0cfe83 74778ddd e8243489 
> ffff4162 c789c085
> Call Trace:
>   [<c0108d4b>] syscall_call+0x7/0xb
> Code:  Bad EIP value.
> 
> -- 
> "Debugging is twice as hard as writing the code in the first place.
> Therefore, if you write the code as cleverly as possible, you are,
> by definition, not smart enough to debug it." - Brian W. Kernighan
> 


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