[ClusterLabs] libqb 0.17.1 - segfault at 1b8

[Radoslaw Garbacz]

Thank you,

On Mon, May 2, 2016 at 4:05 PM, Ken Gaillot <kgaillot at redhat.com> wrote:

> On 05/02/2016 03:45 PM, Jan Pokorný wrote:
> > Hello Radoslaw,
> >
> > On 02/05/16 11:47 -0500, Radoslaw Garbacz wrote:
> >> When testing pacemaker I encountered a start error, which seems to be
> >> related to reported libqb segmentation fault.
> >> - cluster started and acquired quorum
> >> - some nodes failed to connect to CIB, and lost membership as a result
> >> - restart solved the problem
> >>
> >> Segmentation fault reports libqb library in version 0.17.1, a standard
> >> package provided for CentOS.6.
> >
> > Chances are that you are running into this nasty bug:
> > https://bugzilla.redhat.com/show_bug.cgi?id=1114852
> >
> >> Please let me know if the problem is known, and if  there is a remedy
> (e.g.
> >> using the latest libqb).
> >
> > Try libqb >= 0.17.2.
> >
> > [...]
> >
> >> Logs from /var/log/messages:
> >>
> >> Apr 22 15:46:41 (...) pacemakerd[111190]:   notice: Additional logging
> >> available in /var/log/pacemaker.log
> >> Apr 22 15:46:41 (...) pacemakerd[111190]:   notice: Configured corosync
> to
> >> accept connections from group 498: Library error (2)
> >
> > IIRC, that last line ^ was one of the symptoms.
>
> Yes, that does look like the culprit. The root cause is libqb being
> unable to handle 6-digit PIDs, which we can see in the above logs --
> "[111190]".
>
> As a workaround, you can lower /proc/sys/kernel/pid_max (aka
> kernel.pid_max sysctl variable), if you don't want to install a newer
> libqb before CentOS 6.8 is released, which will have the fix.
>
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-- 
Best Regards,

Radoslaw Garbacz
XtremeData Incorporation
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