From: Chuck Ebbert <cebbert@redhat.com>
To: Jason Wessel <jason.wessel@windriver.com>
Cc: lkml <linux-kernel@vger.kernel.org>, stable@kernel.org
Subject: Re: [PATCH] i386 - Fix regression, endless loop in ptrace singlestep over an int80
Date: Mon, 02 Jul 2007 18:03:46 -0400 [thread overview]
Message-ID: <46897642.9030407@redhat.com> (raw)
In-Reply-To: <468965D8.7020405@windriver.com>
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?
next prev parent reply other threads:[~2007-07-02 22:03 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-07-02 20:53 [PATCH] i386 - Fix regression, endless loop in ptrace singlestep over an int80 Jason Wessel
2007-07-02 21:07 ` Jeremy Fitzhardinge
2007-07-02 22:03 ` Chuck Ebbert [this message]
2007-07-02 22:20 ` Jason Wessel
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