The Atlassian JIRA team announces the release of JIRA 4.4.4.

This point release contains several updates and fixes, plus an important bug fix (JRA-26172). This bug lead to a database lock, which typically occurred when custom plugins create issues in a high-load environment (specifically inside the same thread where another issue is being updated).

JIRA 4.4.4 is of course free to all customers with active JIRA software maintenance.
The release notes are here.