[llvm-dev] msan test failures

Fri Sep 21 01:28:39 PDT 2018

I'm seeing some test failures for unit tests for msan (check-msan)
happening in googletest, which I find weird. I'm on Arch Linux, with
r342711. Below is one type of error that I see. The full log is 416MB (!)
big. My guess is that those errors are related, but if anyone needs the
full log, I'll provide it. Here is a reduced log from the end:
https://drive.google.com/file/d/1R5bLcCvgmgojkbDo6lB3jYBTBxweJP3v/view?usp=sharing

What could be the problem? Thanks! :)

SUMMARY: MemorySanitizer: use-of-uninitialized-value
/home/blitz/projects/llvm/utils/unittest/googletest/src/gtest.cc:474:31 in
testing::internal::UnitTestOptions::PatternMatchesString(char const*, char
const*)
==15959==WARNING: MemorySanitizer: use-of-uninitialized-value
    #0 0x739054 in
testing::internal::UnitTestOptions::PatternMatchesString(char const*, char
const*)
/home/blitz/projects/llvm/utils/unittest/googletest/src/gtest.cc:474:31
    #1 0x738fc7 in
testing::internal::UnitTestOptions::PatternMatchesString(char const*, char
const*)
/home/blitz/projects/llvm/utils/unittest/googletest/src/gtest.cc:471:31
    #2 0x738fc7 in
testing::internal::UnitTestOptions::PatternMatchesString(char const*, char
const*)
/home/blitz/projects/llvm/utils/unittest/googletest/src/gtest.cc:471:31
    #3 0x738fc7 in
testing::internal::UnitTestOptions::PatternMatchesString(char const*, char
const*)
/home/blitz/projects/llvm/utils/unittest/googletest/src/gtest.cc:471:31
    #4 0x738fc7 in
testing::internal::UnitTestOptions::PatternMatchesString(char const*, char
const*)
/home/blitz/projects/llvm/utils/unittest/googletest/src/gtest.cc:471:31
    #5 0x7aaeb8 in
testing::internal::UnitTestOptions::MatchesFilter(std::__1::basic_string<char,
std::__1::char_traits<char>, std::__1::allocator<char> > const&, char
const*)
/home/blitz/projects/llvm/utils/unittest/googletest/src/gtest.cc:483:9
    #6 0x7aaeb8 in testing::internal::UnitTestImpl::GetTestCase(char
const*, char const*, void (*)(), void (*)())
/home/blitz/projects/llvm/utils/unittest/googletest/src/gtest.cc:4519
    #7 0x77250b in testing::internal::UnitTestImpl::AddTestInfo(void (*)(),
void (*)(), testing::TestInfo*)
/home/blitz/projects/llvm/utils/unittest/googletest/src/gtest-internal-inl.h:661:5
    #8 0x771e64 in testing::internal::MakeAndRegisterTestInfo(char const*,
char const*, char const*, char const*, testing::internal::CodeLocation,
void const*, void (*)(), void (*)(), testing::internal::TestFactoryBase*)
/home/blitz/projects/llvm/utils/unittest/googletest/src/gtest.cc:2556:22
    #9 0x715f10 in
testing::internal::ParameterizedTestCaseInfo<MemorySanitizerIpTest>::RegisterTests()
/home/blitz/projects/llvm/utils/unittest/googletest/include/gtest/internal/gtest-param-util.h:586:11
    #10 0x7b8899 in
testing::internal::ParameterizedTestCaseRegistry::RegisterTests()
/home/blitz/projects/llvm/utils/unittest/googletest/include/gtest/internal/gtest-param-util.h:714:14
    #11 0x7b8899 in
testing::internal::UnitTestImpl::RegisterParameterizedTests()
/home/blitz/projects/llvm/utils/unittest/googletest/src/gtest.cc:2620
    #12 0x7b8899 in testing::internal::UnitTestImpl::PostFlagParsingInit()
/home/blitz/projects/llvm/utils/unittest/googletest/src/gtest.cc:4454
    #13 0x7b8899 in void testing::internal::InitGoogleTestImpl<char>(int*,
char**)
/home/blitz/projects/llvm/utils/unittest/googletest/src/gtest.cc:5356
    #14 0x73080b in main
/home/blitz/projects/llvm/projects/compiler-rt/lib/msan/tests/msan_test_main.cc:19:3
    #15 0x7fd75b533222 in __libc_start_main (/usr/lib/libc.so.6+0x24222)
    #16 0x46740d in _start
(/home/blitz/projects/bllvm/projects/compiler-rt/lib/msan/tests/Msan-x86_64-with-call-Test+0x46740d)

  Uninitialized value was stored to memory at
    #0 0x470553 in __msan_memcpy.part.350
/home/blitz/projects/llvm/projects/compiler-rt/lib/msan/msan_interceptors.cc:1488:3
    #1 0x7aadab in std::__1::char_traits<char>::copy(char*, char const*,
unsigned long)
/home/blitz/projects/llvm/projects/libcxx/include/__string:225:50
    #2 0x7aadab in std::__1::basic_string<char,
std::__1::char_traits<char>, std::__1::allocator<char> >::__init(char
const*, unsigned long)
/home/blitz/projects/llvm/projects/libcxx/include/string:1779
    #3 0x7aadab in std::__1::basic_string<char,
std::__1::char_traits<char>, std::__1::allocator<char>
>::basic_string<std::nullptr_t>(char const*)
/home/blitz/projects/llvm/projects/libcxx/include/string:814
    #4 0x7aadab in testing::internal::UnitTestImpl::GetTestCase(char
const*, char const*, void (*)(), void (*)())
/home/blitz/projects/llvm/utils/unittest/googletest/src/gtest.cc:4519
    #5 0x77250b in testing::internal::UnitTestImpl::AddTestInfo(void (*)(),
void (*)(), testing::TestInfo*)
/home/blitz/projects/llvm/utils/unittest/googletest/src/gtest-internal-inl.h:661:5
    #6 0x771e64 in testing::internal::MakeAndRegisterTestInfo(char const*,
char const*, char const*, char const*, testing::internal::CodeLocation,
void const*, void (*)(), void (*)(), testing::internal::TestFactoryBase*)
/home/blitz/projects/llvm/utils/unittest/googletest/src/gtest.cc:2556:22
    #7 0x715f10 in
testing::internal::ParameterizedTestCaseInfo<MemorySanitizerIpTest>::RegisterTests()
/home/blitz/projects/llvm/utils/unittest/googletest/include/gtest/internal/gtest-param-util.h:586:11
    #8 0x7b8899 in
testing::internal::ParameterizedTestCaseRegistry::RegisterTests()
/home/blitz/projects/llvm/utils/unittest/googletest/include/gtest/internal/gtest-param-util.h:714:14
    #9 0x7b8899 in
testing::internal::UnitTestImpl::RegisterParameterizedTests()
/home/blitz/projects/llvm/utils/unittest/googletest/src/gtest.cc:2620
    #10 0x7b8899 in testing::internal::UnitTestImpl::PostFlagParsingInit()
/home/blitz/projects/llvm/utils/unittest/googletest/src/gtest.cc:4454
    #11 0x7b8899 in void testing::internal::InitGoogleTestImpl<char>(int*,
char**)
/home/blitz/projects/llvm/utils/unittest/googletest/src/gtest.cc:5356
    #12 0x73080b in main
/home/blitz/projects/llvm/projects/compiler-rt/lib/msan/tests/msan_test_main.cc:19:3
    #13 0x7fd75b533222 in __libc_start_main (/usr/lib/libc.so.6+0x24222)

  Uninitialized value was stored to memory at
    #0 0x470553 in __msan_memcpy.part.350
/home/blitz/projects/llvm/projects/compiler-rt/lib/msan/msan_interceptors.cc:1488:3
    #1 0x7fd75baf9acf in std::__1::basic_string<char,
std::__1::char_traits<char>, std::__1::allocator<char>
>::basic_string(std::__1::basic_string<char, std::__1::char_traits<char>,
std::__1::allocator<char> > const&) (/usr/local/lib/libc++.so.1+0x92acf)

  Uninitialized value was stored to memory at
    #0 0x470553 in __msan_memcpy.part.350
/home/blitz/projects/llvm/projects/compiler-rt/lib/msan/msan_interceptors.cc:1488:3
    #1 0x7718eb in std::__1::char_traits<char>::copy(char*, char const*,
unsigned long)
/home/blitz/projects/llvm/projects/libcxx/include/__string:225:50
    #2 0x7718eb in std::__1::basic_string<char,
std::__1::char_traits<char>, std::__1::allocator<char> >::__init(char
const*, unsigned long)
/home/blitz/projects/llvm/projects/libcxx/include/string:1779
    #3 0x7718eb in std::__1::basic_string<char,
std::__1::char_traits<char>, std::__1::allocator<char>
>::basic_string<std::nullptr_t>(char const*)
/home/blitz/projects/llvm/projects/libcxx/include/string:814
    #4 0x7718eb in testing::internal::MakeAndRegisterTestInfo(char const*,
char const*, char const*, char const*, testing::internal::CodeLocation,
void const*, void (*)(), void (*)(), testing::internal::TestFactoryBase*)
/home/blitz/projects/llvm/utils/unittest/googletest/src/gtest.cc:2554
    #5 0x715f10 in
testing::internal::ParameterizedTestCaseInfo<MemorySanitizerIpTest>::RegisterTests()
/home/blitz/projects/llvm/utils/unittest/googletest/include/gtest/internal/gtest-param-util.h:586:11
    #6 0x7b8899 in
testing::internal::ParameterizedTestCaseRegistry::RegisterTests()
/home/blitz/projects/llvm/utils/unittest/googletest/include/gtest/internal/gtest-param-util.h:714:14
    #7 0x7b8899 in
testing::internal::UnitTestImpl::RegisterParameterizedTests()
/home/blitz/projects/llvm/utils/unittest/googletest/src/gtest.cc:2620
    #8 0x7b8899 in testing::internal::UnitTestImpl::PostFlagParsingInit()
/home/blitz/projects/llvm/utils/unittest/googletest/src/gtest.cc:4454
    #9 0x7b8899 in void testing::internal::InitGoogleTestImpl<char>(int*,
char**)
/home/blitz/projects/llvm/utils/unittest/googletest/src/gtest.cc:5356
    #10 0x73080b in main
/home/blitz/projects/llvm/projects/compiler-rt/lib/msan/tests/msan_test_main.cc:19:3
    #11 0x7fd75b533222 in __libc_start_main (/usr/lib/libc.so.6+0x24222)

  Uninitialized value was created by a heap allocation
    #0 0x4709ec in __interceptor_malloc
/home/blitz/projects/llvm/projects/compiler-rt/lib/msan/msan_interceptors.cc:910:3
    #1 0x7fd75baf8b0b in operator new(unsigned long)
(/usr/local/lib/libc++.so.1+0x91b0b)
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