re-ran it with python-dbg, if it helps:

$ python-dbg
Python 2.7.9 (default, Apr  2 2015, 15:43:03) 
[GCC 4.9.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> from wand.image import Image
[79988 refs]
>>> a = Image(width=4,height=3)
Debug memory block at address p=0xb6f35618: API 'm'
    64 bytes originally requested
    The 3 pad bytes at p-3 are FORBIDDENBYTE, as expected.
    The 4 pad bytes at tail=0xb6f35658 are not all FORBIDDENBYTE (0xfb):
        at tail+0: 0x00 *** OUCH
        at tail+1: 0x00 *** OUCH
        at tail+2: 0xff *** OUCH
        at tail+3: 0xff *** OUCH
    The block was made by call #239078408 to debug malloc/realloc.
    Data at p: 01 00 00 00 0d 00 00 00 ... 00 00 e2 bf 00 00 00 00
Fatal Python error: bad trailing pad byte
Aborted (core dumped)

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https://bugs.launchpad.net/bugs/1460358

Title:
  double free or corruption

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