Re: [Matplotlib-users] segmentation fault and / or bus error with script that cranks out plots with TkAgg backend

[Phil E. <pel...@gm...>]

This is a bit of a surprise. Sounds like it could have something to do with
matplotlib's build, or that of some of its dependencies, so may need
reporting to Gentoo once we've dug a little further. It could be a really
tricky one to diagnose without being able to reproduce locally, but - is
the loop significant? Does the number of figures matter? Essentially, try
to boil it down to as little code as possible (do you need to produce a
line plot to reproduce etc.).

Cheers,


On 6 January 2014 22:18, tenspd137 . <dcd...@gm...> wrote:

> Hi all,
>
> I am running a script that cranks out multiple plots in a loop.  The
> script has plt.show() as the very last line as I think you are supposed to
> do.  All plots show up, but I get a seg fault (sometimes a bus error - I
> haven't figured why it occasionally does that) when I close the last plot
> and the script exits.  I was wondering if someone could help me figure out
> what info to grab to determine what is causing it.  I use gentoo and
> recently did an upgrade world, so I am guessing some new library is not
> playing nicely as this always seemed to work before.  Also, when I switch
> to Qt4Agg backend,
> everything works as expected, but if I can help iron out a bug, I would
> like to - I really think that matplotlib is an excellent piece of software.
>
> Pertinent info:
>
> uname -a:
> Linux dayd 3.10.15-gentoo #6 SMP Sat Dec 14 15:53:47 MST 2013 x86_64
> Intel(R) Xeon(R) CPU E5-2620 0 @ 2.00GHz GenuineIntel GNU/Linux
>
> Matplotlib version - 1.3.1
>
> matplotlibrc:
> backend: TkAgg (Qt4Agg works as expected)
> interactive: False
>
> because it segfaults
>  python3.3 testplot.py --verbose-helpful > output.txt
> outputs nothing
>
> gcc --version:
> gcc (Gentoo 4.8.2 p1.0, pie-0.5.8) 4.8.2
> Copyright (C) 2013 Free Software Foundation, Inc.
> This is free software; see the source for copying conditions.  There is NO
> warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
>
> script to reproduce the problem:
>
> import sys
> import matplotlib.pyplot as plt
>
> def main():
>     for x in range(6):
>         plt.figure()
>         plt.title(x)
>         plt.plot([1,1],[1,1],'r.')
>     plt.show()
>
> if __name__ == "__main__":
>     sys.exit(main())
>
> I found some instructions on how to get debug info when you install a
> package in gentoo.  If anyone else can recreate this or need some more info
> from me - please let me know.  I will do what I can.
>
> Thanks!
>
>
>
>
>
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