Re: [Matplotlib-users] segfault using cx-freeze or bbfreeze with matplotlib TkAgg backend on ubuntu 8.04

[Michael D. <md...@st...>]

I assume you're using the matplotlib 0.91.2 that's distributed with 
Ubuntu 8.04.

There was a recent fix for segfaulting in the exact same place (outside 
of any sort of freezing apparatus).  Since it was related to the 
interpretation of a pointer, it's possible that you would see this 
inside of cx-freeze and not outside on the same machine, just because 
things get loaded into different parts of memory.  I would try that fix 
first, and then look at problems related to freezing.

We should have a new release out shortly, but it's unclear how long that 
will take to trickle down into Ubuntu repositories.

You can check out the SVN maintenance branch from here (which has this 
bugfix):

  svn co 
https://matplotlib.svn.sf.net/svnroot/matplotlib/branches/v0_91_maint 
matplotlib-0.91.x

Let us know how that works for you.

Cheers,
Mike

Jonathan Wright wrote:
> Hello,
>
> I am getting segmentation faults when I try to freeze a script which 
> uses the TkAgg backend, on python2.5.2, gcc 4.2.3 (ubuntu 8.04, hardy 
> heron).  A trial script is:
>
> import matplotlib
> matplotlib.use("TkAgg")  # unless you have it in matplotlibrc
> import matplotlib.backends.backend_tkagg # explicit for freezer
> from matplotlib.pylab import plot, show
> plot(range(10), range(10), "+")
> show()
>
> Is anyone already familiar with the problem? Things seem to work with 
> the GTkAgg backend, but sadly many years ago I decided to use Tk as I 
> thought it'd be easier to distribute. In order to reproduce the problem 
> with bbfreeze you should just need this freezing script:
>
> from bbfreeze import Freezer
> f = Freezer("dist",
>            includes=("matplotlib",
>                      "matplotlib.numerix.fft",
>                      "matplotlib.numerix.linear_algebra",
>                      "matplotlib.numerix.ma",
>                      "matplotlib.numerix.mlab",
>                      "matplotlib.numerix.random_array"))
> f.addScript("t.py")
> f()
>
> For reproducing the problem with cx-freeze you need to (a) install it by 
> patching the cx-freeze setup.py [so that (2, 5) -> (2, 6)] and (b) add 
> an import for numpy.linalg.lapack_lite and edit your numpy.__init__ to 
> remove numpy.test.
>
> Thanks for any advice,
>
> Jon
> ---
>
> PS: gdb  says
> Program received signal SIGSEGV, Segmentation fault.
> [Switching to Thread 0xb7c806b0 (LWP 8158)]
> 0xb6e145a0 in ?? () from 
> /home/wright/testcx/build/exe.linux-i686-2.5/matplotlib.backends._tkagg.so
> (gdb) bt
> #0  0xb6e145a0 in ?? () from 
> /home/wright/testcx/build/exe.linux-i686-2.5/matplotlib.backends._tkagg.so
> #1  0xb6badb6e in TclInvokeStringCommand () from /usr/lib/libtcl8.4.so.0
> #2  0xb6baee56 in TclEvalObjvInternal () from /usr/lib/libtcl8.4.so.0
> #3  0xb6baf0db in Tcl_EvalObjv () from /usr/lib/libtcl8.4.so.0
> #4  0xb6ef96c6 in ?? () from 
> /home/wright/testcx/build/exe.linux-i686-2.5/_tkinter.so
> #5  0x0827a0c8 in ?? ()
> #6  0x00000005 in ?? ()
> ...
>
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-- 
Michael Droettboom
Science Software Branch
Operations and Engineering Division
Space Telescope Science Institute
Operated by AURA for NASA