The prod engine LUCI builder has failed the licenses check in the Linux Unopt build for 3 of the past 7 commits. The failures all involve a mismatch in the licenses_third_party signature.

This failure occurred even though these commits passed the licenses check on the try bots. Some of these commits did not change the dependencies used to generate licenses_third_party and therefore should not have altered the licenses_third_party signature.

The licenses script generates the signature by crawling and hashing a subset of the files in the src/third_party tree. A mismatch could happen if some of the LUCI bot filesystems contain files covered by the crawl that are missing or out of sync on other bots.