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Received: from authenticated user by stravinsky.debian.org with esmtpsa (TLS1.3:ECDHE_SECP256R1__RSA_PSS_RSAE_SHA256__AES_256_GCM:256) (Exim 4.94.2) (envelope-from ) id 1vkd56-00GoQC-W4; Tue, 27 Jan 2026 07:01:45 +0000 Message-ID: <8f8a478ba50bd43d30704f0d74e02058810f2795.camel@debian.org> Subject: Re: BUG: kernel NULL pointer dereference, address: 0000000000000000 From: Giuseppe Sacco To: Sudip Mukherjee , Salvatore Bonaccorso Cc: Paul Menzel , Sudip Mukherjee , linux-kernel@vger.kernel.org, Andrew Morton , linux-mm@kvack.org, regressions@lists.linux.dev, Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, Hans de Goede , Ilpo =?ISO-8859-1?Q?J=E4rvinen?= Date: Tue, 27 Jan 2026 08:01:43 +0100 In-Reply-To: References: <6ba903ad-9897-42bb-8c2d-337385cc3746@molgen.mpg.de> <49cdd663-bcbd-48b4-ac38-77ce94ef0c8d@molgen.mpg.de> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.56.2-8 MIME-Version: 1.0 X-Debian-User: eppesuig X-Rspamd-Server: rspam12 X-Stat-Signature: rq6d6xbedmsoccsaidbqcurccyctk7t7 X-Rspamd-Queue-Id: D893540008 X-Rspam-User: X-HE-Tag: 1769497321-453272 X-HE-Meta: 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Hello Sudip, Il giorno lun, 26/01/2026 alle 18.56 +0000, Sudip Mukherjee ha scritto: [...] > I was going to post the patch today but since you have asked the > reporter of the last bug to test it so lets wait for few more days. >=20 > About the problem showing on the first boot, does that mean that its > only seen on a cold boot ? and not seen on reboots (reboots without > power cycle) ? > Can it be reproduced if the system is powered-off and then powering > it on ? I am that reporter. The problem appeared only once, on a laptop that is never just rebooted, i.e., it is always completely powered off and started again after a few hours. I've built the kernel with your patch but I would not use it until I would find a way to reproduce the error. Sadly I was unable to see the problem again. The only hint I may provide is that the day the problem showed up, I was working in the wild, at about 10=C2=B0C. Maybe this has influenced the hardware response timeing. Bye, Giuseppe