threads/78660: Java hangs unkillably in STOP state after fork()

Thomas Lange thomas.lange at
Thu Mar 10 06:30:04 GMT 2005

>Number:         78660
>Category:       threads
>Synopsis:       Java hangs unkillably in STOP state after fork()
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    freebsd-threads
>State:          open
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Thu Mar 10 06:30:03 GMT 2005
>Originator:     Thomas Lange
>Release:        5.3 Release
FreeBSD 5.3-RELEASE-p5 FreeBSD 5.3-RELEASE-p5 #2: Fri Feb 18 17:19:29 CET 2005     root at  i386

After many calls of Runtime.getRuntime().exec(), which starts an external process, Java hangs reproducably in a STOP state and cannot be killed. (Not even with kill -9)

Run any Java application, which makes extensive use of Runtime.getRuntime().exec().
With my application, I can reproduce the problem within an hour or so - on two different machines.
Apply David Xu's patch to kern_thread.c as described in

That change is also commited to 5.3-stable.

However, maybe someone with a thorough understanding of the internal kernel structure should have a look at it.

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