From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from stravinsky.debian.org (stravinsky.debian.org [82.195.75.108]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id BFF783EBF05; Tue, 27 Jan 2026 07:02:01 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=82.195.75.108 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769497323; cv=none; b=tIUXP8AKB0d4uY4VP6/smp5GXU0VLK+ZoDkLdv4iu7mHUNrjWy328f1jD+c9m3h8PzG9IathX/0H3lJtIEbLeK4/Oas93+P2A2UKEFob9EWOxEvVxt3/NbvuUTQ4MJAu5mbn2zh6APdFn3/m2F76knRURJv82EtZodok73Ltirw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769497323; c=relaxed/simple; bh=E/eYheXWIcYmrXyOOF2pOYIDtvsZl08ZnA+sCoFz/7Y=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=gq6hiZSHAEKLOWZzk8F9/8mBauRc/4QCTZ1QvOhvcNqp2NmSHuxcSIQK5zrUiBGD8Zdi3jftW3GHqzpXKivHFWmEx/5GOwTNSsLiPkWUtEP/knbg1PH7QkzCuIfkZRNyP3BxNOJP48f8BdB6aCEJn0eSpIus1DYluEdi/LEVP0s= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=debian.org; spf=none smtp.mailfrom=debian.org; dkim=pass (2048-bit key) header.d=debian.org header.i=@debian.org header.b=U7MC0Eee; arc=none smtp.client-ip=82.195.75.108 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=debian.org Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=debian.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=debian.org header.i=@debian.org header.b="U7MC0Eee" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=debian.org; s=smtpauto.stravinsky; h=X-Debian-User:MIME-Version:Content-Transfer-Encoding :Content-Type:References:In-Reply-To:Date:Cc:To:From:Subject:Message-ID: Reply-To:Content-ID:Content-Description; bh=E/eYheXWIcYmrXyOOF2pOYIDtvsZl08ZnA+sCoFz/7Y=; b=U7MC0EeeyatJCV4yWkPw0hKXNB mXO2Ofo0sddgWVbAc4w2tfSBHHCEdOzuH2WijgrlLIzBcVjbXWhFHHEvYEFEzgeX4NLMibAQq28ng ZtOZUFOWCP+OvlAbTeZIv23xJ0Z8hf9qujCT1eo8CmE0ejdkInGhrwT/51WrSnnZINoDPVD/FWL2x rq5txjppgBH5e/zaRq7qC1DD8lMl7kdoji0d60thsnfuNtmh/l2wPkS4zHucEuSa/wkDrApq5SLsF xar3VWMaz76M+qqbwZBX1HDKg+qs/e+m3TbELrH/3uiqJUWs8K3maT3YILWB5INpTrZEr29XuI4PR wzgOCLsw==; 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 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Debian-User: eppesuig 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