In that dump I can not see which thread is blocking the others, the jstack output has a reference on each thread that said what thread is the blocker on each thread (- locked <0x00000000> a java.lang.Object), you can try to analyze those thread dump with https://fastthread.io/index.jsp or other online tools to see if you see something relevant, it looks like there is a deadlock.
https://dzone.com/articles/how-to-read-a-thread-dump -- You received this message because you are subscribed to the Google Groups "Jenkins Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/jenkinsci-users/be4b2df4-3d8e-4eef-a988-f96ec7fbe38b%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
