Troubleshooting an Active Hang

A hang is active if the top or vmstat 1 output show CPU levels of over 95%.

This section describes the causes of an active hang, how to collect information about an active hang, and out to analyze this data.

Possible Causes of an Active Hang

Possible causes of an active hang include the following:

• An infinite loop

• Retry of an unsuccessful operation, such as a replication operation or a bad commit

Collecting and Analyzing Data About an Active Hang

On a Solaris system, collect several traces of the Directory Server process stack that is hanging, using the Solaris pstack utility. You should also collect statistics about the active process using the Solaris prstat -L utility. You must collect this information while the server is hanging.

The consecutive pstack and prstat data should be collected every second.