Built executable crashes with "17254 Illegal instruction"


#1

It started to happen today in docker-based builds. There is high chance that an executable built with GCC6 or clang5 will be invalid it will crash on startup with exception “17254 Illegal instruction”.

See this branch: https://circleci.com/gh/ethereum/cpp-ethereum/tree/circleci-mac

Rebuilding sometimes helps, so the issue might be with the host machine. E.g.:
The failing build: https://circleci.com/gh/ethereum/cpp-ethereum/521
The rebuild of the previous one: https://circleci.com/gh/ethereum/cpp-ethereum/523

It looks the crash happens on host with arch: arch1-linux-amd64-6_62 but not on arch1-linux-amd64-6_63.


#2

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