qsort() isn't thread safe - Red Hat Customer Portal

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Issue

In RHEL5, a multi-threaded application using the qsort() function may dump core with a floating point exception. We found out that RHEL6 has the same problem.
The qsort() function is not listed as "need not be thread-safe" functions in POSIX.1-2008, "2.9.1 Thread-Safety". So it shall be thread-safe and be safely available in the multi-threaded application.
This problem is already fixed in the latest upstream glibc(<= 2.12.2).
http://sourceware.org/bugzilla/show_bug.cgi?id=11655

Environment

Red Hat Enterprise Linux 5.8
glibc-2.5-81(RHEL5.8)
Red Hat Enterprise Linux 6.3
glibc-2.12-1.80(RHEL6.3)

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