Description: There is a bug in glibc, that cuse segfault when short-live threads are created with detached state. See:
https://sourceware.org/bugzilla/show_bug.cgi?id=20511
and
https://sourceware.org/bugzilla/show_bug.cgi?id=20116


Additional info:
* package version(s)
* config and/or log files etc.


Steps to reproduce:
Compile and run in loop test program:

#include <unistd.h>
#include <stdio.h>
#include <pthread.h>

#define QSIZE 64
pthread_mutex_t lock;
int active = QSIZE;
pthread_t ptr[QSIZE];
pthread_attr_t attr[QSIZE];

static void *threadapp(void *o)
{
pthread_mutex_lock(&lock);
active--;
pthread_mutex_unlock(&lock);
pthread_exit(NULL);
}

int main(int argc, char *argv[])
{
int j;
if(pthread_mutex_init(&lock, NULL) != 0) {
perror("mutex init");
return 1;
}
printf("Start");
fflush(stdout);
active = QSIZE;
for(j=0; j<QSIZE; ++j) {
int status;
do {
if(pthread_attr_init(&attr[j]) != 0) {
perror("attr init");
return 1;
}
pthread_attr_setdetachstate(&attr[j], PTHREAD_CREATE_DETACHED);
status = pthread_create(&ptr[j], &attr[j], &threadapp, NULL);
if(pthread_attr_destroy(&attr[j]) != 0) {
perror("attr destroy");
return 1;
}
}
while(status != 0);
}
for(;;) {
pthread_mutex_lock(&lock);
if(active == 0) {
pthread_mutex_unlock(&lock);
break;
}
pthread_mutex_unlock(&lock);
}
printf("...Done\n");
return 0;
}

Run it with:
while ./multitest; do sleep 0; done
In few minuts it will segfault.