From: Tomasz Grobelny <tomasz@grobelny.oswiecenia.net>
To: Roland McGrath <roland@redhat.com>
Subject: Re: [PATCH] x86 tls prevent_tail_call
Date: Wed, 27 Feb 2008 20:59:40 +0100
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Cc: Ingo Molnar <mingo@elte.hu>, Thomas Gleixner <tglx@linutronix.de>,
       Andrew Morton <akpm@linux-foundation.org>,
       Linus Torvalds <torvalds@linux-foundation.org>,
       linux-kernel@vger.kernel.org
References: <20080226210018.A031B26F9A4@magilla.localdomain> <20080227072617.GB4638@elte.hu> <20080227073821.0C34C2700FD@magilla.localdomain>
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Dnia Wednesday 27 of February 2008, Roland McGrath napisa?:
> > i'm wondering, have you seen this happen in practice? We use
> > sys_set_thread_area() for every new task started up. I guess we havent
> > seen problems in the field yet because this early during startup tasks
> > do not normally receive signals? (or if they do they are fatal and no
> > user signal context is used.)
>
> Tomasz saw it.  I don't know what compiler or exact options to it he used.
>
VMware image from http://student.agh.edu.pl/~grobelny/linux/BUG.tar 
demonstrates the problem. I didn't play with compiler options myself but used
http://cvs.pld-linux.org/cgi-bin/cvsweb.cgi/SPECS/kernel-vanilla.spec (rev. 
1.129) as basis for my build.
-- 
Regards,
Tomasz Grobelny
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