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Date: Sun, 17 Aug 2014 12:11:57 +0200
From: Szabolcs Nagy <>
Subject: Re: Test case for 'false ownership' of mutex via TID reuse

* Rich Felker <> [2014-08-16 19:06:11 -0400]:
> Sadly it's rather slow and impractical to add to libc-test. I'm not
> sure if it's possible to run it in a container with a smaller pid/tid
> space to get the reuse to happen sooner. It can also have false
> negatives if some other process claims the tid before it gets reused
> for a new thread in the test process. Ideas to make the test more
> practical and reliable would be nice.

i already had a test for this, but did not commit it because of the

i could speed up the test by increasing the max user process limit
(RLIMIT_NPROC) and creating a lot of zombies, but that's probably
not practical

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