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[130.111.218.23]) by smtp.gmail.com with ESMTPSA id p12sm15764423qtw.27.2021.03.03.12.23.01 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 03 Mar 2021 12:23:02 -0800 (PST) From: Vince Weaver X-Google-Original-From: Vince Weaver Date: Wed, 3 Mar 2021 15:22:57 -0500 (EST) To: "Liang, Kan" cc: Stephane Eranian , Vince Weaver , LKML , Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Mark Rutland , Alexander Shishkin , Jiri Olsa , Namhyung Kim Subject: Re: [perf] perf_fuzzer causes unchecked MSR access error In-Reply-To: <9df5f72d-a959-fe46-400a-7dca6c596478@linux.intel.com> Message-ID: References: <61a56699-aab4-ef6-ed8d-a22b6bf532d@maine.edu> <7170d3b-c17f-1ded-52aa-cc6d9ae999f4@maine.edu> <32888c33-c286-c600-66cb-8b1b03beeb8b@linux.intel.com> <6c1f8e-f81-a781-e594-368e7adef0c0@maine.edu> <9df5f72d-a959-fe46-400a-7dca6c596478@linux.intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, 3 Mar 2021, Liang, Kan wrote: > We never use bit 58. It should be a new issue. > Is it repeatable? yes, it's repeatable. (which I'm glad to see because it looks suspiciously like a memory bit flip) Though since it's a WARN_ONCE I have to reboot each time I want to test. If I get a chance I'll try to come up with a reduced test case but probably won't have time for that today. Vince