I have no problem on Linux using pcsc-lite 1.6.5 and your Python sample.

$ ./SCardCancel2.py Context established!
context canceled
Exception: Failed to release context: Command cancelled.


PCSC-Lite 1.5.3 is an old version. You should at least try with version 1.5.5.

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safesign (libaetpkss.so) hangs the process which uses it
https://bugs.launchpad.net/bugs/647545
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