LLDB Stuck in llvm::vfs:: Loop

We’re experiencing an issue where LLDB freezes when debugging certain AST contexts. The sampled stack trace suggests that LLDB is stuck in an infinite loop with the following calls involved:

• llvm::vfs::RedirectingFileSystem::status()
• llvm::vfs::RedirectingFileSystem::getExternalStatus()
• clang::FileSystemStatCache::get()

1. Unfortunately, I don’t have a simple reproducer. The types log doesn’t have information populated, possibly because of the loop.
2. swift-healthcheck is not an option, as we didn't type any expression.

FB: Feedback Assistant

Questions:

1. Any recommendations for additional logging or debugging techniques to help diagnose the root cause?
2. How can we configure a timeout in ~/.lldbInit-Xcode (e.g., some internally decided reasonable threshold X seconds) so that the loop/expr-eval terminates if the timeout is reached?

2 posts - 1 participant

Read full topic