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Description
Bug report
Bug summary
Callingpyplot.show() with TkAgg backend on x86 machine raisesOverflowError.
The format provided toPyArg_ParseTuple inmpl_tk_blit() in file _tkagg.cpp ("ns(iin)(iiii)(iiii):blit") causes the third element in the third argument toblit() (dataptr[2]) to convert to aPy_ssize_t. A 32-bitPy_ssize_t will not accommodate a value greater than or equal to 2^31. I consistently see values outside this range for the third element indataptr (see PDB output below).
Changingiin in the format toiik (dataptr[2] tounsigned long) fixes this problem for me but it may cause problems under other conditions or architectures.
Code for reproduction
frommatplotlibimportpyplotaspltx= [1,2,3,4]y= [1,4,9,16]plt.plot(x,y)plt.show()
Actual outcome
Exception in Tkinter callbackTraceback (most recent call last): File "/usr/local/lib/python3.7/tkinter/__init__.py", line 1702, in __call__ return self.func(*args) File "/usr/local/lib/python3.7/site-packages/matplotlib/backends/_backend_tk.py", line 267, in resize self.draw() File "/usr/local/lib/python3.7/site-packages/matplotlib/backends/backend_tkagg.py", line 10, in draw _backend_tk.blit(self._tkphoto, self.renderer._renderer, (0, 1, 2, 3)) File "/usr/local/lib/python3.7/site-packages/matplotlib/backends/_backend_tk.py", line 91, in blit photoimage.tk.interpaddr(), str(photoimage), dataptr, offsets, bboxptr)OverflowError: Python int too large to convert to C ssize_tException in Tkinter callbackTraceback (most recent call last): File "/usr/local/lib/python3.7/tkinter/__init__.py", line 1702, in __call__ return self.func(*args) File "/usr/local/lib/python3.7/tkinter/__init__.py", line 746, in callit func(*args) File "/usr/local/lib/python3.7/site-packages/matplotlib/backends/_backend_tk.py", line 346, in idle_draw self.draw() File "/usr/local/lib/python3.7/site-packages/matplotlib/backends/backend_tkagg.py", line 10, in draw _backend_tk.blit(self._tkphoto, self.renderer._renderer, (0, 1, 2, 3)) File "/usr/local/lib/python3.7/site-packages/matplotlib/backends/_backend_tk.py", line 91, in blit photoimage.tk.interpaddr(), str(photoimage), dataptr, offsets, bboxptr)OverflowError: Python int too large to convert to C ssize_tArguments to blit() from PDB:
> /usr/local/lib/python3.7/site-packages/matplotlib/backends/_backend_tk.py(91)blit()-> photoimage.tk.interpaddr(), str(photoimage), dataptr, offsets, bboxptr)(Pdb) p photoimage.tk.interpaddr()170396608(Pdb) p str(photoimage)'pyimage10'(Pdb) p dataptr(480, 640, 2990080008)(Pdb) p offsets(0, 1, 2, 3)(Pdb) p bboxptr(0, 640, 0, 480)Expected outcome
A graph mapping [1, 2, 3, 4] to [1, 4, 9, 16].
Matplotlib version
- Operating system: Slackware Linux 14.2, kernel 4.4.157
- Matplotlib version: 3.0.0 (via pip)
- Matplotlib backend (
print(matplotlib.get_backend())): TkAgg - Python version: 3.7.0 (from source, compiled with gcc)
- Jupyter version (if applicable):
- Other libraries: numpy 1.15.2