linux-kernel - Re: [PATCH] i386 - Fix regression, endless loop in ptrace singlestep over an int80

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Message-ID: <46897642.9030407@redhat.com>
Date:	Mon, 02 Jul 2007 18:03:46 -0400
From:	Chuck Ebbert <cebbert@...hat.com>
To:	Jason Wessel <jason.wessel@...driver.com>
CC:	lkml <linux-kernel@...r.kernel.org>, stable@...nel.org
Subject: Re: [PATCH] i386 - Fix regression, endless loop in ptrace singlestep
 over an int80

On 07/02/2007 04:53 PM, Jason Wessel wrote:
> 
> Attached is a patch with a complete test case to fix the regression
> introduced by the commit: 635cf99a80f4ebee59d70eb64bb85ce829e4591f.
> 
> This patch is against kernel 2.6.21 but the fix is applicable to 2.6.21
> and up.  Prior to the commit that introduced the regression the ltp
> ptrace tests would complete correctly.  I augmented the test case from
> the original patch header to include the problem case that shows up in
> the lpt tests.
> 
> The brief summary is that the the TIF_SINGLESTEP state needs to be
> altered on the exit path and not the entry path to a syscall, else it
> can loop forever on the same instruction right after the syscall is
> executed in certain cases.

Where does it loop?

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