Re: Linux 2.6 guest BUG(). (was: Re: Re: [Xen-changelog] Fix VCPU locking in sched_adjdom for multi-VCPU guests)

[Matt Ayres <matta@tektonic.net>]

Keir Fraser wrote:
> 
> On 31 Jan 2006, at 22:42, Matt Ayres wrote:
> 
>> <puts on dunce hat>
>>
>> I've created a comment with the BUG. I remember I was going to have 
>> xen-bugtool include /var/log/messages, but later decided I didn't want 
>> so many system details put out in public.
> 
> How tight on memory are you running the system? The BUG is probably 
> happening because the guest is failing to allocate a page of memory 
> below 4GB. Since Xen tries to give out memory below 4GB last, that 
> probably means there is very little available memory.
>

I can provide dozens of BUG()'s if required.  It just happened again on 
a host in dom0 to the sshd daemon and now that port is locked (netstat 
-nlp reports "-" as the process name).  I am able to access the server 
via the console.

I assume you mean Xen's memory usage. I am showing 141MB free out of 
8112MB total.  Our scripts to add accounts don't allow adding more 
accounts then there is memory for, we actually leave about 128MB as a 
buffer.

> Obviously we need a better fallback strategy than BUG(). :-)
> 

Alright captain, what do I need to do on my end? Grepping 
/var/log/messages for "syscall" grants about 20+ results so something is 
going very wrong.

Thank you,
Matt Ayres