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Date: Thu, 14 Nov 2002 20:26:45 +0100
From: Willy Tarreau <willy@w.ods.org>
To: "Richard B. Johnson" <root@chaos.analogic.com>
Cc: Thorsten Mika <tmika@t-online.de>, "Randy.Dunlap" <rddunlap@osdl.org>,
       linux-kernel@vger.kernel.org
Subject: Re: system lockups and shutdowns fo running processes
Message-ID: <20021114192645.GA553@alpha.home.local>
References: <20021114180807.20f1578f.tmika@t-online.de> <Pine.LNX.3.95.1021114132125.13043A-100000@chaos.analogic.com>
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Hi !

On Thu, Nov 14, 2002 at 01:27:50PM -0500, Richard B. Johnson wrote:
> On Thu, 14 Nov 2002, Thorsten Mika wrote:
> > Call Trace: [<c012f5b4>] [<c0131c47>] [<c0131eb5>] [<c010546c>]
> > Code: 07 20 07 20 07 20 07 20 07 20 07 20 07 20 07 20 07 20 07 20
> Yawn.  It's trying to execute data...
> <TAB><SPC><TAB><SPC><TAB><SPC>..........
> Possible stack overflow.
 
It's not <TAB> <SPC>, it's a copy from a text video memory buffer of an empty
portion of the screen. 07 is the attribute (=color), and 20 the <SPC> which
fills empty space. So this does not look like a buffer overflow, but a use of
a bad pointer somewhere. Perhaps a race during a text scroll or something ?

BTW, <TAB> is 9 :-)

Cheers,
Willy