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==17448==ERROR: AddressSanitizer: heap-use-after-free on address 0x625000025900 at pc 0x0000008342d4 bp 0x7ffcc27c57c0 sp 0x7ffcc27c57b8
READ of size 1 at 0x625000025900 thread T0
    #0 0x8342d3  (/home/brian/src/3.5/cpython/python+0x8342d3)
    #1 0x82eae7  (/home/brian/src/3.5/cpython/python+0x82eae7)
    #2 0x82e188  (/home/brian/src/3.5/cpython/python+0x82e188)
    #3 0x82a605  (/home/brian/src/3.5/cpython/python+0x82a605)
    #4 0x72d0c0  (/home/brian/src/3.5/cpython/python+0x72d0c0)
    #5 0x72da44  (/home/brian/src/3.5/cpython/python+0x72da44)
    #6 0x72c2e2  (/home/brian/src/3.5/cpython/python+0x72c2e2)
    #7 0x4fb16d  (/home/brian/src/3.5/cpython/python+0x4fb16d)
    #8 0x4f4b26  (/home/brian/src/3.5/cpython/python+0x4f4b26)
    #9 0x7fe129a19a3f  (/lib/x86_64-linux-gnu/libc.so.6+0x20a3f)
    #10 0x44e5f8  (/home/brian/src/3.5/cpython/python+0x44e5f8)

0x625000025900 is located 0 bytes inside of 8192-byte region [0x625000025900,0x625000027900)
freed by thread T0 here:
    #0 0x4d5905  (/home/brian/src/3.5/cpython/python+0x4d5905)
    #1 0x8338b7  (/home/brian/src/3.5/cpython/python+0x8338b7)

previously allocated by thread T0 here:
    #0 0x4d55c2  (/home/brian/src/3.5/cpython/python+0x4d55c2)
    #1 0x82dc12  (/home/brian/src/3.5/cpython/python+0x82dc12)

Shadow bytes around the buggy address:
  0x0c4a7fffcad0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c4a7fffcae0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c4a7fffcaf0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c4a7fffcb00: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c4a7fffcb10: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
=>0x0c4a7fffcb20:[fd]fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
  0x0c4a7fffcb30: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
  0x0c4a7fffcb40: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
  0x0c4a7fffcb50: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
  0x0c4a7fffcb60: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
  0x0c4a7fffcb70: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
Shadow byte legend (one shadow byte represents 8 application bytes):
  Addressable:           00
  Partially addressable: 01 02 03 04 05 06 07 
  Heap left redzone:       fa
  Heap right redzone:      fb
  Freed heap region:       fd
  Stack left redzone:      f1
  Stack mid redzone:       f2
  Stack right redzone:     f3
  Stack partial redzone:   f4
  Stack after return:      f5
  Stack use after scope:   f8
  Global redzone:          f9
  Global init order:       f6
  Poisoned by user:        f7
  Container overflow:      fc
  Array cookie:            ac
  Intra object redzone:    bb
  ASan internal:           fe
  Left alloca redzone:     ca
  Right alloca redzone:    cb
==17448==ABORTING