Re: [Xen-devel] null pointer in domU

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 28 Apr 2005, at 03:27, Tupshin Harper wrote:

> After a couple weeks of uptime, my domU router (routing between 3 nics)
> crashed with the following (hand copied as it was locked up hard.
>
> The dom0 was fine, and no problems with the other domUs.
>
> Dom0 running 2.6.11-ac1-xen0 and domU running 2.6.11-ac1-xenU
> Both are basically 2.6.11-xen + alan's ac patch to get additional
> network driver support.
domU got a response from dom0 containing an unexpected request id. domU 
tried to lookup the skbuff corresponding to the id, but read garbage 
(because the id was not currently in use). It crashed when it tried to 
dereference the garbage skbuff pointer.
This is rather nasty -- it's not clear whether dom0 or domU is at fault 
(dom0 may have forgotten about the id, or corrupted its own state, or 
the response from dom0 could be at fault). And it must be hard to 
trigger as we have had no other reports of this. :-(
 -- Keir


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