Runner Example Segfaults

[jwillikers]

Expected Behavior

The runner example should build and run successfully.

Actual Behavior

The runner example program segfaults.

Steps to Reproduce the Problem

1. mkdir build
2. cmake ..
3. cmake --build .

Specifications

• Version: Current master (commit hash 35ac252)
• Platform: macOS 10.15 Catalina
• Toolchain: CMake 3.16.2 / Ninja / XCode / MacPorts LLVM Clang 9.0.0

[kris-jusiak]

@athrun22 can you provide call stack/core file or something to be able to track it down, please?

[jwillikers]

Does this stack trace of the segfault from LLDB work?

* thread #1, queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS (code=1, address=0x0)
  * frame #0: 0x00007fff65e0bc92 libsystem_platform.dylib`_platform_strlen + 18
    frame #1: 0x00007fff62d33a87 libc++.1.dylib`std::runtime_error::runtime_error(char const*) + 39
    frame #2: 0x00000001000017a9 runner`main::$_0::operator(this=0x00007ffeefbff410)() const::'lambda'()::operator()() const at runner.cpp:39:30
    frame #3: 0x0000000100001738 runner`boost::ut::v1_1_5::detail::throws_<main::$_0::operator()() const::'lambda'(), void>::throws_(this=0x00007ffeefbff318)() const::'lambda'() const&)::'lambda'()::operator()() const at ut.hpp:802:13
    frame #4: 0x0000000100001709 runner`boost::ut::v1_1_5::detail::throws_<main::$_0::operator()() const::'lambda'(), void>::throws_(this=0x00007ffeefbff368, expr=0x00007ffeefbff410)() const::'lambda'() const&) at ut.hpp:800:16
    frame #5: 0x00000001000016cd runner`boost::ut::v1_1_5::detail::throws_<main::$_0::operator()() const::'lambda'(), void>::throws_(this=0x00007ffeefbff368, expr=0x00007ffeefbff410)() const::'lambda'() const&) at ut.hpp:807:14
    frame #6: 0x0000000100001449 runner`auto boost::ut::v1_1_5::throws<main::$_0::operator()() const::'lambda'()>(expr=0x00007ffeefbff410)() const::'lambda'() const&) at ut.hpp:1900:10
    frame #7: 0x00000001000012a8 runner`main::$_0::operator(this=0x0000000100001280)() const at runner.cpp:39:12
    frame #8: 0x0000000100001289 runner`main::$_0::__invoke() at runner.cpp:38:30
    frame #9: 0x0000000100001d93 runner`boost::ut::v1_1_5::events::test<void (*)(), boost::ut::v1_1_5::none>::run_impl(test=(runner`main::$_0::__invoke() at runner.cpp:38), (null)=0x00007ffeefbff4e0)(), boost::ut::v1_1_5::none const&) at ut.hpp:878:60
    frame #10: 0x0000000100001d72 runner`boost::ut::v1_1_5::events::test<void (*)(), boost::ut::v1_1_5::none>::operator(this=0x00007ffeefbff4b0)() at ut.hpp:874:33
    frame #11: 0x0000000100001d48 runner`auto cfg::runner::on<void (*)(), boost::ut::v1_1_5::none>(this=0x0000000100003120, test=test<void (*)(), boost::ut::v1_1_5::none> @ 0x00007ffeefbff4b0)(), boost::ut::v1_1_5::none>) at runner.cpp:17:5
    frame #12: 0x0000000100001d25 runner`decltype(event=0x00007ffeefbff558) boost::ut::v1_1_5::detail::on<boost::ut::v1_1_5::events::test<void (*)(), boost::ut::v1_1_5::none> >(boost::ut::v1_1_5::events::test<void (*)(), boost::ut::v1_1_5::none>&&) at ut.hpp:1485:73
    frame #13: 0x00000001000011b5 runner`auto boost::ut::v1_1_5::detail::test::operator=<>(this=0x00007ffeefbff5d0, test=test_location<void (*)()> @ 0x00007ffeefbff5b0)()>) at ut.hpp:1507:5
    frame #14: 0x0000000100001088 runner`main at runner.cpp:38:28
    frame #15: 0x00007fff65c157fd libdyld.dylib`start + 1```

[kris-jusiak]

Thanks @athrun22, can you please check whether the following fix works for you 🤔 -> #272

[jwillikers]

@krzysztof-jusiak, the runner example no longer segfaults. Again, thank you for the speedy response! 🏎

[kris-jusiak]

Perfect, thank you @athrun22, I'll try to add mac/clang to the CI matrix to be able to track these issues.