Record ongoing backtrack attempts (Cherry-pick of #16075) #16080
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A race condition was possible in backtracking where if a `Node` which produced a particular `Digest` had already been invalidated by one consumer, a second consumer would fail to find a source for the `Digest`, and would report "Could not identify a process to backtrack to". Fixes pantsbuild#15995. [ci skip-build-wheels]
tdyas
approved these changes
Jul 7, 2022
# Building wheels and fs_util will be skipped. Delete if not intended. [ci skip-build-wheels]
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A race condition was possible in backtracking where if a
Nodewhich produced a particularDigesthad already been invalidated by one consumer, a second consumer would fail to find a source for theDigest, and would report "Could not identify a process to backtrack to".Fixes #15995.