[issue3661] sys.call_tracing segfaults

[Christian Heimes]

Christian Heimes <lists at cheimes.de> added the comment:

The function call fails much earlier in debug builds. sys_call_tracing()
doesn't check the type of the second argument. It must be a tuple
because it's directly passed to the PyObject_Call() API.

Suggestion: Add an explicit type check for PyTupleType the
sys_call_tracing() function

Check 2.6, too

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nosy: +christian.heimes
priority:  -> release blocker
versions: +Python 2.6

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