Unlike other issues about hangs at startup, mine hangs after all jobs are loaded and happens all the time. I tried resetting jobs with no luck.
I am attaching the log file, a jmap dump and thread dump.
Jenkins was working well with version 1.529, but somehow, my server was restarted (it's a virtual machine which host is not administered by me) and the hang problem appeared. I upgraded it to 1.533 with an intermediate stop to 1.531 but no luck either.