[pthread] Unkillable thread

[Adek336]

After reducing the testcase a lot, I ended up with

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

pthread_cond_t ptcond;
pthread_mutex_t *ptmux;

void* fun(void*)
{
    pthread_mutex_lock(ptmux);

    while (true)
        pthread_cond_wait(&ptcond,ptmux);
    for(;;) sleep(1000);
}

int
main(int argc, char *argv[])
{
    pthread_mutex_t ptm;
    pthread_mutex_init(&ptm,__null);
    pthread_cond_init(&ptcond,__null);
    ptmux = &ptm;
    pthread_t pt;
    pthread_create(&pt, 0, fun, 0);
    for(;;) sleep(100);
}

The main thread for this process is unkillable. Interestingly, sending SIGTERM, SIGINT or SIGKILL to the other thread kills the process.

[Adek336]

hrev37286, VBox 3.1, gcc4+2 hybrid

[Adek336]

When ptm is made global, the thread is no longer unkillable.

[Adek336]

Reproducible in hrev36937, gcc4+2 hybrid, VBox 3.1; not reproducible in hrev36005, gcc4+2 hybrid, VBox 3.1.

[bonefish]

Fixed in hrev37509.