Martin Mokrejs added the comment:
Grr, forgot to look into a file where I recorded STDERR.
Debug memory block at address p=0x449e6900: API 'o'
80 bytes originally requested
The 7 pad bytes at p-7 are not all FORBIDDENBYTE (0xfb):
at p-7: 0xfb
at p-6: 0xfb
at p-5: 0xfa *** OUCH
at p-4: 0xfb
at p-3: 0xfb
at p-2: 0xfb
at p-1: 0xfb
Because memory is corrupted at the start, the count of bytes requested
may be bogus, and checking the trailing pad bytes may segfault.
The 8 pad bytes at tail=0x449e6950 are FORBIDDENBYTE, as expected.
The block was made by call #8155854715 to debug malloc/realloc.
Data at p: 00 00 00 00 00 00 00 00 ... 20 af 5b 3b 0e 7f 00 00
Fatal Python error: bad leading pad byte
Fatal Python error: Aborted
Current thread 0x00007f0e3b7ec700:
File "/usr/lib64/python2.7/site-packages/matplotlib/axes.py", line 932 in cla
File "/usr/lib64/python2.7/site-packages/matplotlib/figure.py", line 906 in
clf
File "/usr/lib64/python2.7/site-packages/matplotlib/figure.py", line 926 in
clear
File "blah.py", line 12513 in draw_hist2d_plot
In that function I call:
del(_series)
del(_ax1)
_figure.clear() # 12513
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<http://bugs.python.org/issue18843>
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