Abstract: dlopen() and related functions are not thread safe Description: glibc 2.0.7 dlopen() may yield unpredictable results when used in a highly theaded environment. Users see various faults and other unpredicatable results. glibc 2.1.1 does not exhibit this behavior. Examination of source for dlopen() shows that in glibc 2.1.1 that dlopen() and related functions are thread-safe.