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https://issues.apache.org/jira/browse/CLOUDSTACK-4623?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13760137#comment-13760137
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Sten Spans commented on CLOUDSTACK-4623:
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There seemed to be plenty of memory available in general, but seemingly a
sudden slab exhaustion led to the unfortunate series of oom-killer events.
> systemvm 2.6.32-5-xen kernel has oom-killer issues
> --------------------------------------------------
>
> Key: CLOUDSTACK-4623
> URL: https://issues.apache.org/jira/browse/CLOUDSTACK-4623
> Project: CloudStack
> Issue Type: Bug
> Security Level: Public(Anyone can view this level - this is the
> default.)
> Components: SystemVM
> Affects Versions: 4.0.2
> Reporter: Sten Spans
> Fix For: 4.2.0
>
>
> During regular operation with haproxy active on of the router-vm's we
> encountered an oom situation which resulted in the kernel killing off
> haproxy. The end-result was unavailability of services hosted behind this
> routervm.
> We believe this was caused by a defect in the kernel supplied with the 4.0.2
> system vm image.
> The issues we encountered were identical to the ones described here:
> http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=700755
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