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[83.28.84.110]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-b70acf84c51sm573083166b.30.2025.11.03.09.37.15 (version=TLS1_2 cipher=AES128-SHA bits=128/128); Mon, 03 Nov 2025 09:37:19 -0800 (PST) Date: Mon, 3 Nov 2025 18:37:13 +0100 From: Michal Pecio To: Sebastian Andrzej Siewior Cc: bp@alien8.de, da.gomez@samsung.com, dave.hansen@linux.intel.com, hpa@zytor.com, jpoimboe@kernel.org, linux-kernel@vger.kernel.org, linux-modules@vger.kernel.org, mcgrof@kernel.org, mingo@redhat.com, paulmck@kernel.org, peterz@infradead.org, petr.pavlu@suse.com, samitolvanen@google.com, tglx@linutronix.de, x86@kernel.org Subject: Re: [PATCH v3 22/28] x86: Use RCU in all users of __module_address(). Message-ID: <20251103182917.74ecb8a6.michal.pecio@gmail.com> In-Reply-To: <20251103113750.qam3KIkT@linutronix.de> References: <20250108090457.512198-23-bigeasy@linutronix.de> <20251103110835.1dca378c.michal.pecio@gmail.com> <20251103103434.D6m23Iud@linutronix.de> <20251103113907.4e647f33.michal.pecio@gmail.com> <20251103113750.qam3KIkT@linutronix.de> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit On Mon, 3 Nov 2025 12:37:50 +0100, Sebastian Andrzej Siewior wrote: > Now, get_stack_info() where the warning originates: It starts with a > check to see if the stack pointer belongs to the current task's stack > frame which it does not. Then it checks if the task found is the > currently running task. That it does. So in that case, we must be > serving an exception (such as an IRQ) because the stack does not > belong to the current task. However preemption is not disabled which > indicates that we do not do this. > This in turn suggests that nvidia replaced the stack from while > entering the syscall probably in _nv003168kms() or the binary blob > which invokes the kernel function does not have a proper ORC entry > which leads to a wrong turn in the process. OK, I see, preemption should only be enabled in the first case, so others are free to assume it's disabled. No bug. Thank you.