Occassional problems with unfreeze

Hrishikesh Barua <talonx@xxxxxxxxx> · Wed, 16 Jul 2014 16:50:22 +0530

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 

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) ?

Regards
Hrish

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