manmanren added a comment. In this testing case, the first clang invocation builds a system module X and a non-system module Y (X imports Y). At the second clang invocation, the parent thread validates the existing module X and module Y. Because X is a system module, we don't diagnose the differences in diagnostic options. When building module Z in the child thread, since Z is not a system module, we will spot the diagnostic differences and invalidate module Y. But the parent thread will continue accessing the deleted FileEntry for module Y.
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