linux-kernel - Re: [PATCH] x86 tls prevent_tail

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Message-Id: <200802272059.40567.tomasz@grobelny.oswiecenia.net>
Date:	Wed, 27 Feb 2008 20:59:40 +0100
From:	Tomasz Grobelny <tomasz@...belny.oswiecenia.net>
To:	Roland McGrath <roland@...hat.com>
Cc:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86 tls prevent_tail_call

Dnia Wednesday 27 of February 2008, Roland McGrath napisał:
> > 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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