summary: Test for bz549813 (dl_close() race with C++ destructor) description: | Bug summary: dl_close() race with C++ destructor Bugzilla link: https://bugzilla.redhat.com/show_bug.cgi?id=549813 Description: This looks like a dup of http://sources.redhat.com/bugzilla/show_bug.cgi?id=654 Create a pthread in the library init. In fini, cancel the pthread and then join. If the main thread does a dlclose(), the program hangs at pthread_join(). It is stuck in a futex. I tried the testcase from http://sources.redhat.com/bugzilla/show_bug.cgi?id=654 and that fails too. One thing that may be relevant is that if dlopen is called with RTLD_NODELETE, pthread_join will not hang. main program-> #include #include int main(int argc, char *argv[]) { void *handle; handle = dlopen("tiny.so",RTLD_NOW); if (handle) printf("loaded shared library\n"); else { printf("could not load shared library\n"); return (-1); } sleep(1); dlclose(handle); } the lib -> #include #include #include #include #include pthread_t t; void *F(void *arg) { int old; if (pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, &old) == 0) { printf("> cancelability enabled.\n"); } else { printf("> could not set cancelability\n"); return (0); } sleep(2); } /*end F */ int _init_rick (void) { printf("in init\n"); if (pthread_create(&t, NULL, (void *(*)(void *)) F, NULL) == 0) printf("started thread\n"); else printf("could not start thread\n"); } /* end _init_rick */ int _fini_rick (void) { printf("in fini\n"); printf("canceling thread\n"); if (pthread_cancel(t) == 0) printf("canceled thread\n"); else printf("could not cancel thread \n"); printf("joining thread\n"); if (pthread_join(t, NULL) == 0) printf("joined with thread\n"); else printf("could not join with thread\n"); } /* end _fini_rick */ contact: Petr Muller component: - glibc test: ./runtest.sh framework: beakerlib recommend: - glibc duration: 30m link: - relates: https://bugzilla.redhat.com/show_bug.cgi?id=549813 extra-summary: /tools/glibc/Regression/bz549813-dl-close-race-with-C-destructor extra-task: /tools/glibc/Regression/bz549813-dl-close-race-with-C-destructor