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From: "Andre Meiser" <ortadur@web.de>
To: freebsd-stable@freebsd.org
Subject: Many core dumps in pthread_getspecific.
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Date: Wed, 3 Jun 2015 13:34:04 +0200
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Hi,

I'm new to FreeBSD and I'm running into a lot of core dumps (mainly from Xorg, but also from vim, firefox, ...).
That's why I asked on freebsd-questions:

https://lists.freebsd.org/pipermail/freebsd-questions/2015-June/266138.html
https://lists.freebsd.org/pipermail/freebsd-questions/2015-June/266141.html

The last Xorg crash was less than 2h ago. :(

It looks like that there is a missing check for NULL in lib/libkse/thread/thr_spec.c (line 211-214):

    pthread = _get_curthread();

    /* Check if there is specific data: */
    if (pthread->specific != NULL && (unsigned int)key < PTHREAD_KEYS_MAX) {

If pthread is NULL it will core dump. So maybe something like this would help:

    if (pthread != NULL && pthread->specific != NULL && (unsigned int)key < PTHREAD_KEYS_MAX) {

But as I'm said, I'm new to FreeBSD I can't evaluate it yet.

I'm running the most recent stable:

% uname -a
FreeBSD andre 10.1-RELEASE-p10 FreeBSD 10.1-RELEASE-p10 #0: Wed May 13 06:54:13 UTC 2015

I haven't compiled the base system so far. Maybe a more experienced FreeBSD guy can verify this and decide if it makes any sense or if I have to dig any deeper into it.

Sincerely yours Andre.