[IPython-user] Re: [IPython-dev] A plea for help with a threading bug...

Fernando Perez Fernando.Perez at colorado.edu
Sat Mar 19 13:39:47 CST 2005

Fernando Perez wrote:

> down to readline.  In particular, I find this to be noteworthy from the 2.3.5 
> release notes at http://www.python.org/2.3.5/NEWS.html:
> Fixed broken threadstate swap in readline that could cause fatal errors when a 
> readline hook was being invoked while a background thread was active. (SF bugs 
> #660476 and #513033.)
> This sounds remarkably similar to our situation.  If this is the case, then we 
> have a closed case.  Yariv, do you have an easy way to test 2.3.5?  I can do 
> it, but probably not today.

OOPS, sorry for the noise.  I misread the above, and that was an entry from 
early on in the 2.3 series, not specific to 2.3.5.  And since Yariv tested 
gentoo with 2.4, we probably still have a readline bug.  Sorry for the 

Yariv, I saw your last entry at


Perhaps you could file these as bugs against readline at the SF tracker? 
Since you want a small self-contained test case, I'm attaching a little gtk 
threaded interactive console which I wrote a while back, based on someone 
else's code, for matplotlib.  You can rip out the matplotlib-specific code, 
but this is small enough that it should be possible to use it to cause the 
crash in a self-contained way, without needing ipython at all.


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