linux-kernel - Re: [Bugme-new] [Bug 9906] New: Weird hang with NPTL and SIGPROF.

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Message-ID: <alpine.LRH.1.00.0802062148480.7445@mini.warudkars.net>
Date:	Wed, 6 Feb 2008 21:57:38 -0500 (EST)
From:	Parag Warudkar <parag.warudkar@...il.com>
To:	Frank Mayhar <fmayhar@...gle.com>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	bugme-daemon@...zilla.kernel.org, linux-kernel@...r.kernel.org,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Roland McGrath <roland@...hat.com>,
	Jakub Jelinek <jakub@...hat.com>
Subject: Re: [Bugme-new] [Bug 9906] New: Weird hang with NPTL and SIGPROF.



On Wed, 6 Feb 2008, Frank Mayhar wrote:

> On Wed, 2008-02-06 at 16:50 -0800, Andrew Morton wrote:
> > It's probably better to handle this one via email, so please send that
> > testcase vie reply-to-all to this email, thanks.
> 
> Testcase attached.
> 
> Build with
>         gcc -D_GNU_SOURCE -c hangc-2.c -o hangc-2.o
>         gcc -lpthread -o hangc-2 hangc-2.o
> 
> Run with
>         hangc-2 4500 4500

FWIW this is not reproducible on 2.6.24/x86/CentOS-51. (I tried running 
it nearly 1500 times in a loop.) Assuming those many tries are sufficient 
to reproduce this bug, there seems to be something specific to the 
environment/architecture/configuration that's necessary to trigger it. 

It might be helpful to provide full details like glibc version, compiler 
version, .config etc.

Parag
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