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Fri, 17 Jul 2020 15:39:07 +0000 (UTC) Subject: Re: [PATCH] gitlab-ci.yml: Add oss-fuzz build tests To: Alexander Bulekov References: <20200716163330.29141-1-alxndr@bu.edu> <75839163-5e7c-3ff4-6d89-870d69ea5979@redhat.com> <9ddec0a1-d106-e36a-b25e-d54235bf75b5@redhat.com> <20200717132007.bux2neofbktbl522@mozz.bu.edu> From: Thomas Huth Openpgp: preference=signencrypt Message-ID: Date: Fri, 17 Jul 2020 17:39:05 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.9.0 MIME-Version: 1.0 In-Reply-To: <20200717132007.bux2neofbktbl522@mozz.bu.edu> Content-Language: en-US X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Received-SPF: pass client-ip=207.211.31.81; envelope-from=thuth@redhat.com; helo=us-smtp-delivery-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/07/17 05:27:47 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -30 X-Spam_score: -3.1 X-Spam_bar: --- X-Spam_report: (-3.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-1, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: =?UTF-8?Q?Alex_Benn=c3=a9e?= , qemu-devel@nongnu.org, Wainer dos Santos Moschetta , darren.kenny@oracle.com, bsd@redhat.com, stefanha@redhat.com, pbonzini@redhat.com, philmd@redhat.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 17/07/2020 15.20, Alexander Bulekov wrote: > On 200717 0951, Thomas Huth wrote: >> On 17/07/2020 07.40, Thomas Huth wrote: [...] >> I think I've got it basically working like this: >> >> build-oss-fuzz: >> <<: *native_build_job_definition >> variables: >> IMAGE: fedora >> script: >> - mkdir build-oss-fuzz >> - CC="clang" CXX="clang++" CFLAGS="-fsanitize=address" >> ./scripts/oss-fuzz/build.sh >> - for fuzzer in $(find build-oss-fuzz/DEST_DIR/ -executable -type f >> | grep -v slirp); do >> grep "LLVMFuzzerTestOneInput" ${fuzzer} > /dev/null 2>&1 || >> continue ; >> echo Testing ${fuzzer} ... ; >> "${fuzzer}" -runs=1000 || exit 1 ; >> done >> >> However, it still triggered a memory leak and thus the pipeline failed: >> >> https://gitlab.com/huth/qemu/-/jobs/643472695 >> >> ... and this was with all the other "leak fix" patches already applied. >> Is there an easy way to debug that issue? That information from the >> LeakSanitizer looks pretty sparse... > > Strange... Especially since Philippe didn't get the same error. We > should probably add -seed=1 after -runs=1000, to make sure the fuzzer is > using the same rng seed. That said, I just ran the fuzzer for 50k > iterations, and still could not reproduce the leak... > > This environment variable should fix the partial stacktrace, so we don't > have to guess next time: > ASAN_OPTIONS="fast_unwind_on_malloc=0" Thanks, that did the trick: https://gitlab.com/huth/qemu/-/jobs/644354706#L3616 ... that also explains why I haven't seen it in my other tests where I am using the --fuzz-target parameter : The leak only happens if the fuzz-target is encoded in the program name - looks like we have to free the memory returned by g_path_get_dirname() there... Thomas