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

[Daniel P. Berrange]

On Wed, Oct 08, 2008 at 07:32:21PM +0200, Stefan de Konink wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA512
> 
> [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. 

Daniel
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