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  1. Core Server
  2. SERVER-101114

Installed v5 toolchain ASAN can't compile passing a local array to a function

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    • Type: Icon: Bug Bug
    • Resolution: Fixed
    • Priority: Icon: Major - P3 Major - P3
    • 8.2.0-rc0
    • Affects Version/s: None
    • Component/s: None
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    • Server Programmability
    • Fully Compatible
    • ALL
    • Programmability 2025-03-03, Programmability 2025-03-17
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      Compiling the following file with the installed v5 toolchain's clang (or clang++) segfaults:

      void f(char *buf) { }

int main() {
    char _buf[8];
    f(_buf);
    return 0;
}

      Compile with /opt/mongodbtoolchain/v5/bin/clang -fsanitize=address minimal.c and you'll observe the crash. Any other clang or clang++ seems to work, including the functionally similar v5 bazel toolchain clang. This happens on all revisions of the v5 toolchain.

            Assignee:
            ryan.berryhill@mongodb.com Ryan Berryhill
            Reporter:
            ryan.berryhill@mongodb.com Ryan Berryhill
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              Created:
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