[issue5614] Malloc errors in test_io

[Ronald Oussoren]

Ronald Oussoren <ronaldoussoren at mac.com> added the comment:

Buffer_size is set to 0x7fffffffffffffff in BufferedWriter_init at the end 
of test_constructor.

I have no idea why this happens, but this definitly seems wrong to me. 
Debugging is rather hard at the moment because the issue goes away in the 
debugger.

Setting this as a release blocker because arguments of a wrong magnitude 
to memory allocation functions are scary.

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priority:  -> release blocker
stage:  -> needs patch
type:  -> crash

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