Our development has been struggling with jenkins hang issue since a week.
Our problem is best describe by the option no.2 from link https://wiki.jenkins-ci.org/display/JENKINS/Jenkins+is+hanging

2. Jenkins is not picking up HTTP requests, so all attempts to connect hang and no page is ever rendered.

Tried many options as disabled diskusage plugins, increase JVM memory options, removed all offline nodes etc.
But problem still exist, request you to please provide a suggestion to solve it.

As given in above link we have generated thread dump and heap dump and attached here for further analysis.
Please inform in further information required.

Thanks,
Umesh Soni