On Wed, Jul 16, 2014 at 04:50:22PM +0530, Hrishikesh Barua wrote: > We use XFS on Amazon EBS on Ubuntu 12.04.3, kernel "3.2.0-54-virtual". > > Our backup scripts invoke "xfs_freeze -f" before taking a snapshot to > ensure filesystem consistency. After the snapshot is taken, we invoke > "xfs_freeze -u". > > Recently, we have observed that some of these unfreeze calls exit with code > 255. This results in a frozen filesystem, processes queuing up and us > having to reboot the EC2 instance. Invoking freeze -u manually results in > multiple processes like this - > > 17628 ? D 0:00 /usr/sbin/xfs_io -F -r -p xfs_freeze -x -c > thaw /mysql-vol-a > 17694 ? D 0:00 /usr/sbin/xfs_io -F -r -p xfs_freeze -x -c > thaw /mysql-vol-a > > A search on this list reveals at least one other instance of this problem - > http://oss.sgi.com/archives/xfs/2013-01/msg00437.html That one looks like a freeze hang whereas you see an unfreeze hang. Perhaps similar to this: https://bugzilla.redhat.com/show_bug.cgi?id=1052004 > > No resolution seems to have happened there. Is this a known bug, or has it > been fixed since (I'm running xfsprogs 3.1.7) ? > Do you have the hung task output for when this occurs (echo w > /proc/sysrq-trigger)? Brian > Regards > Hrish > _______________________________________________ > xfs mailing list > xfs@xxxxxxxxxxx > http://oss.sgi.com/mailman/listinfo/xfs _______________________________________________ xfs mailing list xfs@xxxxxxxxxxx http://oss.sgi.com/mailman/listinfo/xfs
