[Bug 66316] httpd hung at __lll_lock_wait / pthread_mutex_lock

[bugzilla]

https://bz.apache.org/bugzilla/show_bug.cgi?id=66316

--- Comment #5 from Seann Herdejurgen <se...@herdejurgen.com> ---

I located the source code for the modperl_tipool_pop() method. If the XXX: code
below is executed, the method returns before releasing the
modperl_tipool_lock(tipool) lock.

modperl_list_t *modperl_tipool_pop(modperl_tipool_t *tipool)
{
    modperl_list_t *head;

    modperl_tipool_lock(tipool);

    if (tipool->size == tipool->in_use) {
        if (tipool->size < tipool->cfg->max) {
            MP_TRACE_i(MP_FUNC,
                       "no idle items, size %d < %d max\n",
                       tipool->size, tipool->cfg->max);
            if (tipool->func->tipool_rgrow) {
                void * item =
                    (*tipool->func->tipool_rgrow)(tipool, tipool->data);

                modperl_tipool_add(tipool, item);
            }
        }
        /* block until an item becomes available */
        modperl_tipool_wait(tipool);
    }

    head = tipool->idle;

    tipool->idle = modperl_list_remove(tipool->idle, head);
    tipool->busy = modperl_list_append(tipool->busy, head);

    tipool->in_use++;

    /* XXX: this should never happen */
    if (!head) {
        MP_TRACE_i(MP_FUNC, "PANIC: no items available, %d of %d in use\n", 
                   tipool->in_use, tipool->size);
        abort();
    }

    modperl_tipool_unlock(tipool);

    return head;
}

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