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Abort trap: 6 when using pip3 search

The issue is due to to pyopenssl using old dependencies. It can be fixed by removing the Python package cryptography package and then upgrading cryptography to version 2.8.

1. Find the location of the Python package cryptography.

   pip3 show cryptograph
   

2. Remove the whole package directory.

   sudo rm -rf /path/to/cryptograph
   

3. Reinstall the latest version of cryptograph.

   pip3 install cryptograph
   

https://github.com/pypa/pip/issues/7254