Python source dist and wheels differ in behavior #13906
Description
For example, installing on Ubuntu via:
pip install 'grpcio==1.8.2'
the spinlock bug fixed by #13665 is still present, but building from the source dist
pip install 'grpcio==1.8.2' --no-binary=grpcio
the bug is resolved.
(I realize #13665 will be reverted has been reverted, but this issue is just reporting that your process of building wheels may be broken.)