Problematic Thread error at runtime - Linux only

Using JDK 1.3.0_02, RedHat Linux 6.2 and Forte for Java 2.0, we're seeing an issue that only occurs using Linux, not Solaris. They've got a Forte for Java module with special startup script that sets the necessary environment then calls the FFJ executable. After startup, when FFJ is exited, the following error occurs:

# # An unexpected exception has been detected in native code outside the
VM.
# Program counter=0x4b992cd0
#
# Problematic Thread: prio=1 tid=0x814a478 nid=0x67b9 runnable
#
# # An unexpected exception has been detected in native code outside the
VM.
# Program counter=0x4041f1a3
#
# Problematic Thread: prio=1077805912 tid=0x814a478 nid=0x67b9 runnable
#
# # An unexpected exception has been detected in native code outside the
VM.
# Program counter=0x4b9a8c47
# Problematic Thread: prio=1 tid=0x81989a0 nid=0x67ee runnable
# HotSpot Virtual Machine Error, Unexpected Signal 11
# Please report this error at
# http://java.sun.com/cgi-bin/bugreport.cgi
#
# Error ID: 4F533F4C494E55580E43505005BC
#
# Problematic Thread: prio=1 tid=0x8222438 nid=0x67f2 runnable

I have successfully reproduced this with the listed configuration, but they are unable to provide a simple test case, as this involves FFJ, MainWin, etc.

Bug #4343002 is a similar bug, but we are using glibc 2.1.3, not 2.1.2