linux-kernel - Re: [PATCH 0/2] kgdb: x86: fix breakpoint removal problems

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Message-ID: <d5c8fdfbdfa096c9c1215a2ccd1cabefc63f1ec8.camel@florommel.de>
Date: Wed, 14 Aug 2024 02:33:29 +0200
From: Florian Rommel <mail@...rommel.de>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, 
 Borislav Petkov <bp@...en8.de>, Dave Hansen <dave.hansen@...ux.intel.com>,
 "H . Peter Anvin" <hpa@...or.com>, Jason Wessel
 <jason.wessel@...driver.com>, Daniel Thompson <daniel.thompson@...aro.org>,
 Douglas Anderson <dianders@...omium.org>,  Lorena Kretzschmar
 <qy15sije@....cs.fau.de>, Stefan Saecherl <stefan.saecherl@....de>, Peter
 Zijlstra <peterz@...radead.org>, Christophe JAILLET
 <christophe.jaillet@...adoo.fr>,  Randy Dunlap <rdunlap@...radead.org>,
 Masami Hiramatsu <mhiramat@...nel.org>, Christophe Leroy
 <christophe.leroy@...roup.eu>, Geert Uytterhoeven
 <geert+renesas@...der.be>,  kgdb-bugreport@...ts.sourceforge.net,
 x86@...nel.org,  linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/2] kgdb: x86: fix breakpoint removal problems

On Tue, 2024-08-13 at 17:10 -0700, Andrew Morton wrote:
> On Mon, 12 Aug 2024 01:22:06 +0200 Florian Rommel <mail@...rommel.de> wrote:
> 
> > This series fixes two problems with KGDB on x86 concerning the removal
> > of breakpoints, causing the kernel to hang.  Note that breakpoint
> > removal is not only performed when explicitly deleting a breakpoint,
> > but also happens before continuing execution or single stepping.
> 
> Neat.  It would be nice to fix earlier kernels; for that it is
> desirable to identify a Fixes: target.  From a quick look it appears
> this issue is more than a decade old, in which case I don't believe a
> Fixes: is needed - our request becomes "please backport to everything".
> 

Thanks. There is already a v2 (due to my negligence on the details) and
a bit of discussion:
https://lore.kernel.org/all/20240812174338.363838-1-mail@florommel.de/

Rgeards,
Florian