multithreaded access to the same ccache

[Greg Hudson]

Is this hypothesis correct?

I think your hypothesis is correct, and this is a bug in the memory
ccache implementation. I will file an issue.

Is there something I could do at
application-level in order to avoid this situation? I'm thinking of
either protecting all calls to GSSAPI/Kerberos by mutexes or using
thread-level ccaches, though both approaches would decrease the performance.

Either of those seems like it should work.
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