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MemorySanitizer is a compile-time instrumentation layer in clang and GCC. Together with AddressSanitizer mostly makes the run-time instrumentation of Valgrind redundant. It is a little more tricky to set up, because running with uninstrumented libraries will lead into false positives. You will need an instrumented libc++, and you should use -stdlib=libc++ instead of the default libstdc++. To build the instrumented library, you can refer to https://github.com/google/sanitizers/wiki/MemorySanitizerLibcxxHowTo or you can adapt these steps that worked for me, for clang-8 version 8.0.1: cd /mariadb sudo apt source libc++-8-dev cd llvm-toolchain-8-8.0.1 mkdir libc++msan; cd libc++msan cmake ../libcxx -DCMAKE_BUILD_TYPE=Release -DLLVM_USE_SANITIZER=Memory \ -DCMAKE_C_COMPILER=clang-8 -DCMAKE_CXX_COMPILER=clang++-8 Then, in your MariaDB build directory, you have to compile with libc++ and bundled libraries, such as WITH_SSL=bundled, WITH_ZLIB=bundled. For uninstrumented system libraries, you will get false positives for uninitialized values. Like this: cmake -DWITH_MSAN=ON -DWITH_SSL=bundled -DWITH_ZLIB=bundled \ -DCMAKE_CXX_FLAGS='-stdlib=libc++' .. Note: you should also add -O2 to the compiler options, or you may get crashes due to stack overflow. Finally, to run tests, you must replace libc++ with the instrumented one: LD_LIBRARY_PATH=/mariadb/llvm-toolchain-8-8.0.1/libc++msan/lib \ MSAN_OPTIONS=abort_on_error=1 \ ./mtr --big-test --parallel=auto --force --retry=0 Failure to do so will report numerous false positives related to operations on std::string and the like. This is work in progress. Some issues will still have to be fixed for WITH_MSAN to be usable. See MDEV-20377 for details. |
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| .. | ||
| build_configurations | ||
| Internal/CPack | ||
| os | ||
| abi_check.cmake | ||
| bison.cmake | ||
| build_depends.cmake | ||
| character_sets.cmake | ||
| check_compiler_flag.cmake | ||
| compile_flags.cmake | ||
| configurable_file_content.in | ||
| configure.pl | ||
| cpack_deb.cmake | ||
| cpack_rpm.cmake | ||
| cpack_source_ignore_files.cmake | ||
| cpu_info.cmake | ||
| crc32-vpmsum.cmake | ||
| create_initial_db.cmake.in | ||
| ctest.cmake | ||
| do_abi_check.cmake | ||
| dtrace.cmake | ||
| dtrace_prelink.cmake | ||
| FindJava.cmake | ||
| FindJNI.cmake | ||
| FindLZ4.cmake | ||
| FindZSTD.cmake | ||
| for_clients.cmake | ||
| info_bin.cmake | ||
| info_macros.cmake.in | ||
| info_src.cmake | ||
| install_layout.cmake | ||
| install_macros.cmake | ||
| jemalloc.cmake | ||
| libutils.cmake | ||
| maintainer.cmake | ||
| make_dist.cmake.in | ||
| mariadb_connector_c.cmake | ||
| merge_archives_unix.cmake.in | ||
| misc.cmake | ||
| mysql_add_executable.cmake | ||
| mysql_version.cmake | ||
| numa.cmake | ||
| package_name.cmake | ||
| pcre.cmake | ||
| plugin.cmake | ||
| readline.cmake | ||
| sign.cmake.in | ||
| ssl.cmake | ||
| stack_direction.c | ||
| submodules.cmake | ||
| systemd.cmake | ||
| tags.cmake | ||
| versioninfo.rc.in | ||
| win_compatibility.manifest | ||
| wsrep.cmake | ||
| zlib.cmake | ||