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Fri, 26 Sep 2025 03:36:37 -0700 (PDT) Received: from localhost ([196.207.164.177]) by smtp.gmail.com with UTF8SMTPSA id 5b1f17b1804b1-46e2ab31f62sm112597515e9.15.2025.09.26.03.36.36 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 26 Sep 2025 03:36:37 -0700 (PDT) Date: Fri, 26 Sep 2025 13:36:34 +0300 From: Dan Carpenter To: Will Deacon Cc: Emanuele Rocca , Mark Rutland , linux-arm-kernel@lists.infradead.org Subject: Re: [BUG] ARM64 regression: NULL pointer dereference in arm_smccc_version_init+0x90/0x1ac Message-ID: References: <20250131124103.GA29766@willie-the-truck> <20250204100014.GA777@willie-the-truck> <20250206131154.GD3204@willie-the-truck> <20250313220835.GD8101@willie-the-truck> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20250313220835.GD8101@willie-the-truck> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250926_033639_886065_40D1B81B X-CRM114-Status: GOOD ( 15.97 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Thu, Mar 13, 2025 at 10:08:36PM +0000, Will Deacon wrote: > On Thu, Feb 06, 2025 at 05:57:41PM +0100, Emanuele Rocca wrote: > > On 2025-02-06 01:11, Will Deacon wrote: > > > In your screenshot, x6 looks like it's retained its poison value, but > > > that was the register being corrupted in the initial report. Maybe you > > > could share the diff you made? > > > > Sure, please see [1]. A kernel built with that patch crashes and all > > registers retain their poison values. > > Okey doke, at least it sounds like the firmware isn't taking advantage > of the broken spec, then. > > In any case, I think the right way forward here is to use the > out-of-line 1.2 helpers whenever we can (the spectre mitigations can > stay as they are). > > Will > Any updates on this? I guess it only affects gcc13? Clang seems to boot okay. regards, dan carpenter