Race condition in cachetools causing cache to stuck in error

[Dor-Shwartz]

We are using cachetools to wrap access to our db. From a certain point, we started receiving the following error consistently.

File "/usr/local/lib/python3.10/site-packages/cachetools/init.py", line 739, in wrapper cache[k] = v File "/usr/local/lib/python3.10/site-packages/cachetools/init.py", line 422, in setitem self.expire(time) File "/usr/local/lib/python3.10/site-packages/cachetools/init.py", line 476, in expire cache_delitem(self, curr.key) File "/usr/local/lib/python3.10/site-packages/cachetools/init.py", line 90, in delitem del self.__data[key] KeyError: ()

[tkem]

You are probably using a shared cache in a threaded environment without proper locking. See also

• https://github.com/tkem/cachetools/issues?q=is%3Aissue+KeyError
• https://cachetools.readthedocs.io/en/latest/#cachetools.cached