[ClusterLabs] Antw: Re: corosync eats the whole CPU core in epoll_wait() on one node in cluster

[Vladislav Bogdanov]

02.06.2015 09:17, Ulrich Windl wrote:
>>>> Jan Friesse <jfriesse at redhat.com> schrieb am 01.06.2015 um 16:20 in Nachricht
> <556C6A19.5080007 at redhat.com>:
>
> [...you cut the part where it seems like polling an invalid file descriptor...]
>
>> strace of pacemakerd shows absolutely normal.
>
> [...]
>
> If you wait for I/O on an invalid file dewcriptior, you can busy the CPU quite easily. Usually this is the case where querying ERRNO to quit a loop helps ;-)
>

Yep, invalid/disabled fd could be the root of the issue, but I'd like to 
make sure that either I hit #147 (pe->state == QB_POLL_ENTRY_DELETED) or 
it is completely different issue.

There is no reproducer code/path available in #147, so I'm unable to 
compare strace outputs with it.

> Not saying I diagnosed the proplem correctly, but that was my first impression.
>
> Regards,
> Ulrich
>
>
>
>
>
> _______________________________________________
> Users mailing list: Users at clusterlabs.org
> http://clusterlabs.org/mailman/listinfo/users
>
> Project Home: http://www.clusterlabs.org
> Getting started: http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf
> Bugs: http://bugs.clusterlabs.org
>