Re: [Matplotlib-users] segfaults in ipython

[Charles M. <cm...@in...>]

I get segfaults with ipython -pylab (and without the flag) quite a bit as well. 
  They usually seem pretty random and frequent, but I found one way to reproduce.

gentoo-linux
ipython-0.6.15
matplotlib-cvs

plot(rand(10))
a = gca()
a.bbox<return>
Segmentation fault

This may not be a practical example, but it is the only consistent one I can 
find right now.

- Charlie

John Hunter wrote:
>>>>>>"Steve" == Steve Schmerler <el...@gm...> writes:
> 
> 
>     Steve> Hi I recently posted something about segfaults I get when
>     Steve> plotting. Now here is a little update and I really hope
>     Steve> someone has an idea how I can solve this problem.
> 
>     Steve> I'm running IPython 0.6.13 on a Debian box, installed the
>     Steve> recent mpl 0.83.2 from source, GTKAgg backend.
> 
>     Steve> 1)
> 
>     Steve> When I start ipython (as normal user) with the -pylab
>     Steve> option and then say
> 
>     Steve> 	plot([1,2,3])
> 
>     Steve> I get
> 
>     Steve> In [1]: plot([1,2,3])
>     Steve> ---------------------------------------------------------------------------
>     Steve> exceptions.SystemError Traceback (most recent call last)
> 
> 
>     Steve> SystemError: ../Objects/moduleobject.c:48: bad argument to
>     Steve> internal function
> 
> You say this is a segfault, but it looks like an exception.  Does this
> actually kill the ipython shell?  Is this a full posting of the
> traceback?
> 
> What happens if you run the following script outside of ipython
> 
>     from pylab import plot, show
>     plot([1,2,3])
>     show()
> 
> with 
> 
>   > python test.py --verbose-helpful 
> 
> Does this create a proper figure window -- please post all output from
> the script.
> 
> 
>     Steve> 2)
> 
>     Steve> However when I change to root
> 
>     Steve> 	su <pwd>
> 
>     Steve> 	ipython -pylab
> 
>     Steve> then plotting works fine!?
> 
> Perhaps this has something to do with having permission to connect to
> the X11 server?  As a normal user, can you launch graphical apps from
> the shell, eg 
> 
>  > gedit&
> 
> 
> Have you done anything unusual with your system, changed the default
> permission bits, done a chroot, etc?  What linux distro are you
> running?
> 
> 
>     Steve> I have no idea where this moduleobject.c lives or to which
>     Steve> application it belongs.
> 
>     Steve> 2)
> 
>     Steve> If I try the same with the normal python interpreter
> 
>     Steve> 	python
> 
>     Steve> 	from pylab import *; ion() plot([1,2,3])
> 
>     Steve> a plot window pops up but shows no picture (no matter if
>     Steve> I'm root or not).
> 
> 
> GTKAgg is not expected to work unless you are in a special threaded
> environment like ipython with -gthread or -pylab.  Try the same with
> the TkAgg backend (edit your rc file) and let me know what happens.
> 
> The last thing I'd advise is upgrading your ipython to the latest.
> 
> I've never seen this one before so I'm flying by the seat of my pants.
> 
> 
> JDH
> 
> 
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