[Bf-committers] Python context internal state bug

[Jacques Lucke]

Ahh thanks a lot Campbell. That was helpful! 

Am 2015-09-10 14:30, schrieb Campbell Barton: 

> Hi Jacques,
> 
> There are reports about this already, (search for the error message).
> When manipulating Blender's state while rendering this can happen [1 [2]]
> 
> If you're not doing that, best narrow down the test-case and report a
> bug in our tracker: https://developer.blender.org [4]
> 
> [1]: https://twitter.com/tonroosendaal/status/370851236930539520 [5]
> 
> On Thu, Sep 10, 2015 at 9:17 PM, Jacques Lucke <mail at jlucke.com> wrote: 
> 
>> Hi all,
>> 
>> while developing the animation nodes I get a specific error message
>> quite often in the console: "ERROR: Python context internal state bug.
>> this should not happen!"
>> 
>> In the Blender source code this print statement is here:
>> https://developer.blender.org/diffusion/B/browse/master/source/blender/python/intern/bpy_interface.c$152 [1]
>> 
>> What wonders me the most is that everything keeps working I just get
>> this error message in the console. And not only one time but many
>> hundred times.
>> Unfortunally I didn't found a reliable way to reproduce this yet (I try
>> to find one for weeks already...) but I have some ideas:
>> 
>> 1. The error message always appears first while I was rendering. After
>> the rendering finishes the message is still printed in the console many
>> times per second.
>> 2. Until now the error only came when I was doing a mesh animation. That
>> means my node setup calculates a vertices, edges and polygons and
>> replaces the mesh data on an existing mesh object in blender with that.
>> 3. Obviusly I use some of the handlers in bpy.app.handlers. All
>> calculations are done in the scene_update_post event.
>> 4. Just noticed after loading factory settings that the error always
>> raises when the UI redraws.
>> 
>> I use Windows 7 64 bit and the error appeared in all of the last Blender
>> releases. Currently I use 282811f.
>> 
>> I know that it can be quite hard to find out what raises this error
>> because I don't have steps to reproduce. Especially because sometimes it
>> renders all frames fine and sometimes 100 were rendered and then the
>> error appears although the same code is executed as before.
>> 
>> Therefor my main question is what triggers this error and why doesn't it
>> stop when I load factory settings? And if you have an idea what I/you
>> can do against it.. even better.
>> 
>> Here is an image showing the error in the console:
>> http://www.pasteall.org/pic/show.php?id=92952 [2] [1 [2]]
>> 
>> Thanks in advance
>> Jacques Lucke
>> 
>> Links:
>> ------
>> [1] http://www.pasteall.org/pic/show.php?id=92952 [2]
>> _______________________________________________
>> Bf-committers mailing list
>> Bf-committers at blender.org
>> http://lists.blender.org/mailman/listinfo/bf-committers [3]

 

Links:
------
[1]
https://developer.blender.org/diffusion/B/browse/master/source/blender/python/intern/bpy_interface.c$152
[2] http://www.pasteall.org/pic/show.php?id=92952
[3] http://lists.blender.org/mailman/listinfo/bf-committers
[4] https://developer.blender.org
[5] https://twitter.com/tonroosendaal/status/370851236930539520