[libvirt] Xen and out of memory stuff, blocks libvirtd

[Stefan de Konink]

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Daniel P. Berrange schreef:
> On Wed, Oct 08, 2008 at 07:32:21PM +0200, Stefan de Konink wrote:
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>> [2008-10-08 19:14:05 13001] ERROR (XendCheckpoint:157) Save failed on
>> domain klant1_monetdb (17) - resuming.
>> Traceback (most recent call last):
>>   File "usr/lib64/python2.5/site-packages/xen/xend/XendCheckpoint.py",
>> line 125, in save
>>     forkHelper(cmd, fd, saveInputHandler, False)
>>   File "usr/lib64/python2.5/site-packages/xen/xend/XendCheckpoint.py",
>> line 358, in forkHelper
>>     child = xPopen3(cmd, True, -1, [fd, xc.handle()])
>>   File "usr/lib64/python2.5/site-packages/xen/util/xpopen.py", line 100,
>> in __init__
>>     self.pid = os.fork()
>> OSError: [Errno 12] Cannot allocate memory
>> [2008-10-08 19:14:05 13001] DEBUG (XendDomainInfo:2456)
>> XendDomainInfo.resumeDomain(17)
>>
>> After this point, I am unable to contact the libvird daemon.
> 
> Well your host OS has run out of memory, so pretty much everything
> will be fubar at this point. If it can't even fork() then there's
> not much libvirt until this is resolved. libvirt tries to handle
> OOM scenario but there's some places we might have missed, but
> even so, the best libvirt can do is to drop all further requests
> as gracefully as possible. 

Not quite right, the host OS still has 32MB of memory at this point. But
I agree strange things, even with later saves. If there is anything that
is able to remove that painful xend stuff... I'm happy to give it a shot.


Stefan
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