Hi,

Yesterday, I compiled a small mutex program on a Debian lenny AMD64
using GCC 4.2.x. The compilation went through successfully, but
running the application caused errors randomly.

Sometimes, the application aborted with the following:
tst_app: pthread_mutex_lock.c:87: __pthread_mutex_lock: Assertion
`mutex->__data.__owner == 0' failed.
Aborted

Sometimes, the function pthread_mutex_init(...) returned an error code
95, which is not a possible return code based on the manual page (man
3 pthread_mutex_init).

Both errors didn't not happen when compiled on a Debian etch Intel
using GCC 4.1.2.

Can anyone help me on this? Thanks in advance.

Regards,
wenlong (boon leong)

The test application source code:

#include
#include

int main()
{
pthread_mutex_t m_;

pthread_mutexattr_t ptype;
int rc = pthread_mutexattr_settype(&ptype,
PTHREAD_MUTEX_RECURSIVE);
if (rc != 0)
{
printf("pthread_mutexattr_settype failed. rc=%d \n", rc);
return 1;
}
rc = pthread_mutex_init(&m_, &ptype); // rc=95 randomly.
if (rc != 0)
{
printf("pthread_mutex_init failed. rc=%d \n", rc);
return 1;
}

rc = pthread_mutex_lock(&m_); // Aborts here randomly.
if (0 == rc)
{
printf("lock: ok \n");
}
else
{
printf("lock failed. rc=%d \n", rc);
}
rc = pthread_mutex_unlock(&m_);
if (0 != rc)
{
printf("unlock failed. rc=%d \n", rc);
}

rc = pthread_mutex_destroy(&m_);
if (rc != 0)
{
printf("Fail to destroy a mutex. rc=%d \n", rc);
return 1;
}
return 0;
}