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From: "siddhesh at redhat dot com" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug nptl/15988] New: tst-mutexpi8 test case failure on non-x86 systems
Date: Tue, 01 Oct 2013 09:24:00 -0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=15988

            Bug ID: 15988
           Summary: tst-mutexpi8 test case failure on non-x86 systems
           Product: glibc
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: nptl
          Assignee: siddhesh at redhat dot com
          Reporter: siddhesh at redhat dot com
                CC: drepper.fsp at gmail dot com

tst-mutexpi8 test case fails on non-x86 boxes (tested s390 and got a similar
report for ppc) for recursive mutexes.  Here's a reproducer that produces the
same failure.

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

pthread_mutex_t mutex;
pthread_mutexattr_t attr;
pthread_cond_t cond;
pthread_t tid;

void *callback(void *arg){
        for (;;){
                sleep(2);
                pthread_mutex_lock(&mutex);
                printf("Wake up!\n");
                pthread_cond_broadcast(&cond);
                pthread_mutex_unlock(&mutex);
        }
}

int main(){
        pthread_mutexattr_init(&attr);
        pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
        pthread_mutexattr_setprotocol(&attr, PTHREAD_PRIO_INHERIT);
        pthread_mutex_init(&mutex, &attr);
        pthread_cond_init(&cond, NULL);

        pthread_mutex_lock(&mutex);
        pthread_create(&tid, NULL, callback, &cond);

        printf("Going to sleep\n");
        for(;;){
                pthread_cond_wait(&cond, &mutex);
                printf("OK\n");
                exit(0);
        }
}

Actual results:

Going to sleep
Wake up!
Wake up!
Wake up!
Wake up!
Wake up!
Wake up!
Wake up!
Wake up!
Wake up!
Wake up!
Wake up!
Wake up!
...

Expected Result:

Going to sleep
Wake up!
OK

Patch coming soon.

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