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Re: [PATCH] Test case for BZ 19329

From: Florian Weimer <fweimer at redhat dot com>
To: Szabolcs Nagy <szabolcs dot nagy at arm dot com>, GNU C Library <libc-alpha at sourceware dot org>
Cc: nd at arm dot com
Date: Thu, 24 Nov 2016 12:40:36 +0100
Subject: Re: [PATCH] Test case for BZ 19329
Authentication-results: sourceware.org; auth=none
References: <5836CC80.9070101@arm.com>

On 11/24/2016 12:18 PM, Szabolcs Nagy wrote:

Test concurrent dlopen and pthread_create when the loaded
modules have TLS.  This triggers dl-tls assertion failures
more reliably than the tst-stack4 test.

The dlopened module has 100 DT_NEEDED dependencies and
for me about 4000 concurrent thread creations are needed
to see failures on x86_64.

2016-11-24  Szabolcs Nagy  <szabolcs.nagy@arm.com>

	[BZ #19329]
	* nptl/Makefile (tests): Add tst-tls7.
	(modules-names): Add tst-tls7mod, tst-tls7mod-dep.
	* nptl/tst-tls7.c: New file.
	* nptl/tst-tls7mod-dep.c: New file.
	* nptl/tst-tls7mod.c: New file.

Please do not use assert in tests. Use the xpthread_* functions intest-skeleton.c instead.

This test will fail on large SMP machines due to timeouts because threadcreation is rather expensive there. A less resource-intense way ofwriting this test would be to iterate multiple times and try to hit therace each time, with a smaller number of threads created in parallel.


Florian

Follow-Ups:
- Re: [PATCH] Test case for BZ 19329
  - From: Szabolcs Nagy

References:
- [PATCH] Test case for BZ 19329
  - From: Szabolcs Nagy

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