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[130.111.218.23]) by smtp.gmail.com with ESMTPSA id a20sm7656595qkj.28.2019.02.01.08.27.29 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Fri, 01 Feb 2019 08:27:29 -0800 (PST) From: Vince Weaver X-Google-Original-From: Vince Weaver Date: Fri, 1 Feb 2019 11:27:28 -0500 (EST) X-X-Sender: vince@macbook-air To: Jiri Olsa cc: Ravi Bangoria , lkml , Peter Zijlstra , linux-perf-users@vger.kernel.org, Arnaldo Carvalho de Melo , Andi Kleen , eranian@google.com, vincent.weaver@maine.edu, "Naveen N. Rao" Subject: Re: System crash with perf_fuzzer (kernel: 5.0.0-rc3) In-Reply-To: <20190201074353.GA8778@krava> Message-ID: References: <7c7ec3d9-9af6-8a1d-515d-64dcf8e89b78@linux.ibm.com> <20190130183648.GA24233@krava> <20190131082711.GC24233@krava> <20190201074353.GA8778@krava> User-Agent: Alpine 2.21 (DEB 202 2017-01-01) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, 1 Feb 2019, Jiri Olsa wrote: > with attached patch I did not trigger the fuzzer crash > for over a day now, could you guys try? I've just started fuzzing with the patch applied. Often it takes a few hours to trigger the bug. Added question about this bug. It appeared that the crash was triggered by the BTS driver over-writing kernel memory. The data being written, was this user controllable? Meaning, is this a security issue being fixed, or just a crashing issue? Vince Weaver vincent.weaver@maine.edu