Raymond Hettinger added the comment:

Serhiy contends that calling newblock() can mutate the deque (its only external 
call is PyMem_Malloc()).  I'm trying understand how that could be possible if 
it is just a thin wrapper around malloc.

Before gumming-up the code in an effort to avoid calling newblock(), I want to 
understand whether there is an actual issue here and if so whether 
PyMem_RawMalloc() would solve the problem directly.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue25135>
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