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https://bugzilla.redhat.com/show_bug.cgi?id=683587
--- Comment #5 from Jim Basney jbasney@ncsa.uiuc.edu 2011-07-07 09:52:30 EDT --- The zombie process issue is caused by the Globus pthr libraries blocking SIGCHLD:
https://bugzilla.mcs.anl.gov/globus/show_bug.cgi?id=7105
It is fixed in the Globus Toolkit v5.1.0 libraries. The problem does not occur with earlier non-pthr Globus libraries.