Re: segfault in VM

[Chris Andrews <chris@nodnol.org>]

Derek Glidden wrote:
> 
> On Jul 19, 2004, at 9:01 PM, Derek Glidden wrote:
> 
>> (XEN) (file=x86_32/emulate.c, line=228) Bailing: not a -ve offset into 
>> 4GB segment.
>> (XEN) (file=x86_32/emulate.c, line=235) !!!! DISALLOWING UNSAFE ACCESS 
>> !!!!
> 
> 
> After pounding on that box pretty much all evening with "nosmp", I 
> wasn't able to make it crash, either in dom0 or a VM, like I had been 
> able to do in SMP mode.

Which revision of the code were you running there? I'd like to give it a 
go...

> I had some weirdness in dom0 when I woke up and checked on it this 
> morning - a compile had failed that shouldn't have, but there were no 
> log messages either from Xen or dom0, so I'm not really sure what that was.
> 
> Tonight I'll pull the latest changes and rebuild everything, reboot it 
> without "nosmp" (make it SMP again) and see what happens.

I've been trying various old revisions as far back as 1.1068[*] (so 
far), and I can't find one that doesn't blow up.

My test is to run James' 'compare' script in domain0 on two large 
identical files of randomness, and compile various things continuously 
in a 2.4.26 domain1. It usually takes only a few minutes to start 
showing differences, and if I leave it I'll get segfaults in domain0, 
then (with at least one revision) a panic in domain0 and reboot.

Just now I tried the latest code (post Keir's 1.1116/1.1117 csets) and 
I'm seeing much the same results.

Hardware is a Dell 1650, single CPU, 1G RAM, aacraid controller. I've 
got rid of the devicemapper stuff I was running before, and domain1's 
root is on an ordinary disk partition.


Chris.


[*] is this a suitably precise way of specifying revision? 1.1068 is 
based on the list from:
http://xen.bkbits.net:8080/xeno-unstable.bk/ChangeSet@-2w?nav=index.html


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