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

[Thomas Lange]

>Number:         78660
>Category:       threads
>Synopsis:       Java hangs unkillably in STOP state after fork()
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    freebsd-threads
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Thu Mar 10 06:30:03 GMT 2005
>Closed-Date:
>Last-Modified:
>Originator:     Thomas Lange
>Release:        5.3 Release
>Organization:
>Environment:
FreeBSD hellraiser.smega.com 5.3-RELEASE-p5 FreeBSD 5.3-RELEASE-p5 #2: Fri Feb 18 17:19:29 CET 2005     root at hellraiser.smega.com:/usr/obj/usr/src/sys/HELLRAISER-05-02-02  i386

>Description:
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)

>How-To-Repeat:
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.
>Fix:
Apply David Xu's patch to kern_thread.c as described in 

http://lists.freebsd.org/pipermail/freebsd-current/2004-November/042407.html

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.
>Release-Note:
>Audit-Trail:
>Unformatted: