SQLVDI error - attempt to release mutex not owned by caller

Posted by Chris W on Server Fault See other posts from Server Fault or by Chris W
Published on 2009-07-13T08:14:03Z Indexed on 2012/04/14 5:31 UTC
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I've started getting some errors in the App event log of one of our database servers (Windows 2003 & SQL Server 2005). The nightly full database backups are completing successfully however immediately after the job success is written to the event log there is a run of entries that say:

SQLVDI: Loc=CVDS. Desc=Release(ClientAliveMutex). ErrorCode=(288)Attempt to release mutex not owned by caller.

There's five of these logged - the server itself has more than 20 databases on it which are all backed up successfully.

The server is backed up by Bacula using a VSS backup.

Has anyone got any ideas what would be causing the errors? They seem to have started after a re-boot on Friday to install some patches which included KB960089.

Edit:

After getting the errors for a few days they've now stopped without any action on my part other than letting the backups continue as they were. It may be a coincidence but they stopped after Bacula completed its weekly full rather than the daily incremental backup.

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