[Bug nptl/454] New: pthread_key_create does not reset key's value to NULL

["gmorin1 at bloomberg dot net" <sourceware-bugzilla at sources dot redhat dot com>]

Hi,

In some cases, linuxthreads/nptl do not reset the key value to NULL. If you create a key, set a value 
delete it, then create a new one, the value of the newly created key will be the one you set for the 
former one. This behavior violates POSIX : "Upon key creation, the value NULL is associated with the 
new key in all active threads.  Upon thread creation, the value NULL is associated with all defined keys 
in the new thread."

Here is a simple program to reproduce the problem:

#include <pthread.h>
#include <stdio.h>
#include <string.h>
#include <assert.h>

int main(void) {
        pthread_key_t k1,k2;
        int ret;

        ret = pthread_key_create(&k1, NULL);
        if (ret) {
                printf("pthread_key_create: %s\n", strerror(ret));
                        return -1;
        }
        assert(NULL == pthread_getspecific(k1));
        ret = pthread_setspecific(k1, (void *) 0xdeafbeefUL);
        if (ret) {
                printf("pthread_setspecific: %s\n", strerror(ret));
                return -2;
        }
        assert((void *) 0xdeafbeefUL == pthread_getspecific(k1));
        ret = pthread_key_delete(k1);
        if (ret) {
                printf("pthread_key_delete: %s\n", strerror(ret));
                return -4;
        }
        ret = pthread_key_create(&k2, NULL);
        if (ret) {
                printf("pthread_key_create: %s\n", strerror(ret));
                return -5;
        }
        assert(NULL == pthread_getspecific(k2));
        return 0;
}

The last assert fails. I reproduced the problems on different glibc 2.3.{2,3} installations on SuSE and 
Debian. Older versions also have the bug. I can reproduce it on a venerable Debian stable.

Guillaume.

-- 
           Summary: pthread_key_create does not reset key's value to NULL
           Product: glibc
           Version: 2.3.2
            Status: NEW
          Severity: normal
          Priority: P2
         Component: nptl
        AssignedTo: drepper at redhat dot com
        ReportedBy: gmorin1 at bloomberg dot net
                CC: glibc-bugs at sources dot redhat dot com


http://sources.redhat.com/bugzilla/show_bug.cgi?id=454

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