[Yum] Strange hang...

Garrick Staples garrick at usc.edu
Wed Nov 1 16:43:59 UTC 2006

On Wed, Nov 01, 2006 at 11:27:25AM -0500, Brian Long alleged:
> On Wed, 2006-11-01 at 08:58 -0500, Robert G. Brown wrote:
> > On Wed, 1 Nov 2006, seth vidal wrote:
> > 
> > > rm -f /var/lib/rpm/__db*
> > > rpm --rebuilddb
> > 
> > Yes this was exactly it.  yum -d 10 showed the hang was at the rpmdb
> > read, so I could figure it out.
> Robert, Seth,
> We've had so many issues with the futex issue that our auto-update
> script has a ton of logic in it before calling yum update.
> We run "/usr/lib/rpm/rpmdb_stat -c -h /var/lib/rpm | grep 'current
> locks' | cut -f 1" and if the number is not 0, we remove
> the /var/lib/rpm/__db* files and rebuild the RPM database.
> It's surprising the number of rpm --rebuilddb's we run on a daily basis
> across 7,000+ RHEL 3 and 4 hosts.  A bunch of fixes were put into place
> on RHEL 3 Update 5's rpm, so we've pushed it to all RHEL 3 boxes
> (including those not yet running Update 5+).  It reduced the issue, but
> we still have a few hundred rebuilds a day and we've haven't been able
> to track it down.

Just to show that it isn't always that bad, I have near 2000 RHEL3 hosts
and I've only had to rebuilddb a few times.  

I think the only real cause I've seen is an OOM condition that kills
yum at exactly the wrong point.

Garrick Staples, Linux/HPCC Administrator
University of Southern California
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