[PATCH] D138846: MC/DC in LLVM Source-Based Code Coverage: LLVM back-end and compiler-rt

[Alan Phipps via Phabricator via cfe-commits]

alanphipps added a comment.

In D138846#4656594 <https://reviews.llvm.org/D138846#4656594>, @hans wrote:

> Just a heads up that we're seeing crashes in the Rust compiler which bisects to this change. Investigating in https://bugs.chromium.org/p/chromium/issues/detail?id=1500558

Thank you for the repro!  This was a very straightforward fix; effectively the inlining of an instrumented function into multiple functions led to the creation of duplicate data variables, ultimately leading to a segfault in emitNamedata() when eraseFromParent() was called multiple times from the same NamePtr.  Prior to my change to abstract the creation of the data variable, there was no explicit check for this, but it was inadvertently avoided by checking that multiple counter sections were not created.

I created a pull request for the fix here: https://github.com/llvm/llvm-project/pull/71998


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