Last modified: 2013-05-06 19:20:43 UTC
See https://integration.wikimedia.org/ci/job/mediawiki-core-doxygen-publish/362/console
It was causing it to fail for REL1_19,20,21 and master. Something was likely interrupted. Doesn't workspace cleanup prevent this? I've manually rm'ed the index.lock for now. Jobs are working again.
Most probably related to a git process that crashed. I will investigate the build logs to find out if that occurred on other repositories.
I could not find any other occurrences of 'index.lock' in the April logs. The job most probably got triggered when Jenkins was getting mad or restarting and git got unproperly killed leaving the lock behind.