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Tue, 25 Aug 2026 02:55:31 -0700 (PDT) Date: Tue, 25 Aug 2026 11:55:29 +0200 From: Petr Mladek To: Bradley Morgan Cc: Andrew Morton , Jinchao Wang , Feng Tang , Rio , Pnina Feder , Petr Pavlu , Sergey Senozhatsky , linux-kernel@vger.kernel.org, Sashiko , stable@vger.kernel.org Subject: Re: [PATCH v6 0/6] panic: fix panic_force_cpu= redirect races and NMI bypass Message-ID: References: <20260818163806.17460-1-include@grrlz.net> <20260818114158.cc20b0cfcbe730a30597b466@linux-foundation.org> <0EBA4DAD-7B63-4AD6-B1E7-523D09E1305D@grrlz.net> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <0EBA4DAD-7B63-4AD6-B1E7-523D09E1305D@grrlz.net> On Tue 2026-08-18 19:45:47, Bradley Morgan wrote: > On 18 August 2026 19:41:58 BST, Andrew Morton > wrote: > >On Tue, 18 Aug 2026 16:38:00 +0000 Bradley Morgan > >wrote: > > > >> The panic_force_cpu= parameter redirects a panic to a specific CPU so > >> the crash kernel runs there. The redirect code in panic_try_force_cpu() > >> had two races and an NMI bypass, all found by Sashiko. This series > >> closes them and kills one more hack that the rework turned up. > > > >Thanks. Sashiko had more to say: > > https://sashiko.dev/#/patchset/20260818163806.17460-1-include@grrlz.net > > > >In the first one it suggests va_copy(), but perhaps this would be > >better addressed with va_end/va_start. > > > > Sashiko said there was ANOTHER bug, I might just screammm, at this point, > some sort of superhero needs to come by and suggest the fix that sashiko > likes :sob: We are all still learning how to deal with Sashiko. It is quite good at finding problems. We always have to decide/agree on what is worth fixing and what is not worth it. I described my opinion in replies to the particular patches. Anyway, we are getting close. I believe that v7 will be final ;-) Best Regards, Petr