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The leak sanitizer has a bug [1] where, if it detects a leak, it forks something, and before that, it closes all files (instead of using close_range like a good citizen). Docker tends to create containers with the NOFILE limit (number of open files) set to 1 billion. The resulting 1 billion close() system calls is incredibly slow. Work around that problem by passing the host NOFILE limit. [1] https://github.com/llvm/llvm-project/issues/59112 Closes #12638