Segfault when running touch tracer app

[girivs]

Kivy segfaults when running the touchtracer app. This happens in Mac OS X Snow Leopard with the Kivy development stream from github as well as the stable versions. Looks like a memory leak.

http://paste.pocoo.org/show/441545/

[geekynils]

Seems to happen when you put a lot of fingers on the touchpad here are the error messages from the terminal:

[ERROR ] [OSC ] Address 0.0.0.0:3333 already in use, retry in 2 second
* Recognized (0x62) family* (20 cols X 12 rows) using raw16bitRange= 460, thresh8bits= 3, zsignal_per_pixelsum= 46
[ERROR ] [OSC ] Address 0.0.0.0:3333 already in use, retry in 2 second
[ERROR ] [OSC ] Address 0.0.0.0:3333 already in use, retry in 2 second
[ERROR ] [OSC ] Address 0.0.0.0:3333 already in use, retry in 2 second
[ERROR ] [OSC ] Address 0.0.0.0:3333 already in use, retry in 2 second
[ERROR ] [OSC ] Address 0.0.0.0:3333 already in use, retry in 2 second
[ERROR ] [OSC ] Address 0.0.0.0:3333 already in use, retry in 2 second
[ERROR ] [OSC ] Address 0.0.0.0:3333 already in use, retry in 2 second
[ERROR ] [OSC ] Address 0.0.0.0:3333 already in use, retry in 2 second
[ERROR ] [OSC ] Address 0.0.0.0:3333 already in use, retry in 2 second
[ERROR ] [OSC ] Address 0.0.0.0:3333 already in use, retry in 2 second
2011-07-18 22:59:41.631 Python[465:5f03] *** __NSAutoreleaseNoPool(): Object 0x1018a9ae0 of class SDL_QuartzWindow autoreleased with no pool in place - just leaking
2011-07-18 22:59:41.633 Python[465:5f03] *** __NSAutoreleaseNoPool(): Object 0x101bf2fb0 of class NSCFNumber autoreleased with no pool in place - just leaking
2011-07-18 22:59:41.634 Python[465:5f03] *** __NSAutoreleaseNoPool(): Object 0x1002f8f60 of class NSConcreteValue autoreleased with no pool in place - just leaking
2011-07-18 22:59:41.634 Python[465:5f03] *** __NSAutoreleaseNoPool(): Object 0x101886b10 of class NSCFNumber autoreleased with no pool in place - just leaking
2011-07-18 22:59:41.635 Python[465:5f03] *** __NSAutoreleaseNoPool(): Object 0x1018cfc20 of class NSConcreteValue autoreleased with no pool in place - just leaking
2011-07-18 22:59:41.635 Python[465:5f03] *** __NSAutoreleaseNoPool(): Object 0x119b55790 of class NSCFDictionary autoreleased with no pool in place - just leaking
Fatal Python error: (pygame parachute) Segmentation Fault
Abort trap
examples > [ERROR ] [OSC ] Address 0.0.0.0:3333 already in use, retry in 2 second
[ERROR ] [OSC ] Address 0.0.0.0:3333 already in use, retry in 2 second
[ERROR ] [OSC ] Address 0.0.0.0:3333 already in use, retry in 2 second
examples >
examples > [ERROR ] [OSC ] Address 0.0.0.0:3333 already in use, retry in 2 second

examples > [ERROR ] [OSC ] Address 0.0.0.0:3333 already in use, retry in 2 second
[ERROR ] [OSC ] Address 0.0.0.0:3333 already in use, retry in 2 second

examples > [ERROR ] [OSC ] Address 0.0.0.0:3333 already in use, retry in 2 second
jobs
examples > [ERROR ] [OSC ] Address 0.0.0.0:3333 already in use, retry in 2 second
[ERROR ] [OSC ] Address 0.0.0.0:3333 already in use, retry in 2 second
[ERROR ] [OSC ] Address 0.0.0.0:3333 already in use, retry in 2 second
[ERROR ] [OSC ] Address 0.0.0.0:3333 already in use, retry in 2 second
[ERROR ] [OSC ] Address 0.0.0.0:3333 already in use, retry in 2 second
[ERROR ] [OSC ] Address 0.0.0.0:3333 already in use, retry in 2 second
[ERROR ] [OSC ] Address 0.0.0.0:3333 already in use, retry in 2 second
[ERROR ] [OSC ] Address 0.0.0.0:3333 already in use, retry in 2 second
[ERROR ] [OSC ] Address 0.0.0.0:3333 already in use, retry in 2 second
[ERROR ] [OSC ] Address 0.0.0.0:3333 already in use, retry in 2 second

[tito]

1. First, if you have taken the upstream (master) version, ensure that everything is compiled by doing:

   make distclean && make

2. Change the log level to debug (and comment TUIO line in the config file). Edit ~/.kivy/config.ini and change log_level to debug. Add # in the "default = tuio, ..." line.

3. Use the kivy package to have a clean kivy environment (you should have used make-symlinks before):

   kivy

4. Extend the PYTHONPATH to use your latest compiled Kivy:

   export PYTHONPATH=~/path/to/your/upstream/kivy:$PYTHONPATH

5. Ensure that the PYTHONPATH is ok by testing the import of kivy. It should show the 1.0.8-dev version too. If the path if not good, back to 4. point:

   python -c 'import kivy; print kivy.file'

6. Try to remake the crash:

   python /path/to/touchtracer/main.py

7. If you still got the crash, try with gdb:

   gdb --args python /path/to/touchtracer/main.py
   run

8. When the crash have happened, show the backtrace:

   bt

9. Send the complete output from the 1. to 9. in your console to paste.pocoo.org. Everything is important, please don't try to cut the output :)

Thanks !

[geekynils]

Well I just downloaded the (binary?) osx Version from the kivy website. Maybe I'll check it out from github later. Do you not have access to a Mac yourself?

[dennda]

We do.

Your log is not complete, however. Please paste everything from start to finish.

[geekynils]

Here it is:

Kivy > kivy examples/demo/touchtracer/main.py
[INFO ] Kivy v1.0.7
[WARNING] [Config ] Older configuration version detected (0 instead of 3)
[WARNING] [Config ] Upgrading configuration in progress.
[DEBUG ] [Config ] Upgrading from 0 to 1
[DEBUG ] [Config ] Upgrading from 1 to 2
[DEBUG ] [Config ] Upgrading from 2 to 3
[INFO ] [Logger ] Record log in /Users/nils/.kivy/logs/kivy_11-07-19_5.txt
[INFO ] [Factory ] 95 symbols loaded
[WARNING] [Image ] Unable to use as loader!
[INFO ] [Text ] using as text provider
[INFO ] [Window ] using as window provider
[INFO ] [GL ] OpenGL version <2.1 NVIDIA-1.6.36>
[INFO ] [GL ] OpenGL vendor
[INFO ] [GL ] OpenGL renderer <NVIDIA GeForce 9600M GT OpenGL Engine>
[INFO ] [GL ] Shading version <1.20>
[INFO ] [GL ] Texture max size <8192>
[INFO ] [GL ] Texture max units <16>
[INFO ] [Shader ] fragment compiled successfully
[INFO ] [Shader ] vertex compiled successfully
[INFO ] [GL ] NPOT texture support is available
[INFO ] [Loader ] using as thread loader
[INFO ] [OSC ] using for socket
[INFO ] [Base ] Start application main loop
* Recognized (0x62) family* (20 cols X 12 rows) using raw16bitRange= 460, thresh8bits= 3, zsignal_per_pixelsum= 46
[INFO ] [OSC ] listening for Tuio on 0.0.0.0:3333
2011-07-19 14:12:34.187 Python[2263:5f03] *** __NSAutoreleaseNoPool(): Object 0x101d261f0 of class SDL_QuartzWindow autoreleased with no pool in place - just leaking
2011-07-19 14:12:34.189 Python[2263:5f03] *** __NSAutoreleaseNoPool(): Object 0x1018d7cd0 of class NSCFNumber autoreleased with no pool in place - just leaking
2011-07-19 14:12:34.190 Python[2263:5f03] *** __NSAutoreleaseNoPool(): Object 0x1018618c0 of class NSConcreteValue autoreleased with no pool in place - just leaking
2011-07-19 14:12:34.191 Python[2263:5f03] *** __NSAutoreleaseNoPool(): Object 0x101d09450 of class NSCFNumber autoreleased with no pool in place - just leaking
2011-07-19 14:12:34.192 Python[2263:5f03] *** __NSAutoreleaseNoPool(): Object 0x101d33810 of class NSConcreteValue autoreleased with no pool in place - just leaking
2011-07-19 14:12:34.192 Python[2263:5f03] *** __NSAutoreleaseNoPool(): Object 0x119c2eab0 of class NSCFDictionary autoreleased with no pool in place - just leaking
Fatal Python error: (pygame parachute) Segmentation Fault
Abort trap

[a-zb]

I would like to add that a crash also is reproducible in touchtracer on my OSX 10.6.8. I downloaded the 1.0.7 dmg image
from Kivy website and run the demos by running Kivy in terminal and passing the main.py as an argument.

Complete stacktrace: http://paste.pocoo.org/show/444275/

It seems to happen in the vbo.so module.

Edit: In addition, the error is triggered by the drawing routines since, when I take out code from from all 4 on_* handlers in Touchtracer class , it doesn't happen: http://paste.pocoo.org/show/444278/

2nd edit: If I only take out the code that draws the label, it does not crash anymore. So that's good news that narrows it down a bit: http://paste.pocoo.org/show/444282/

3rd edit: The crash seems to be caused by the three lines of code inside on_touch_up handler. If that code is executed, the app doesn't crash. http://paste.pocoo.org/show/444431/

That code only removes the group and the widget so that the drawn lines and labels disappear when a user raises their finger.

4th edit: this line causes the crash
self.remove_widget(ud['label'])
without it, the demo doesn't crash

[tito]

Thanks a lot for the analysis. I still doesn't understand how to trigger it :/ Can you tell me if it's as soon as your using it ?
Or after some times ?

One test i would like you to do too, is to check how many times the on_touch_up is called ?

[tito]

Ow ow ow ow ow ! I see why it's crashing. I don't think it's an issue about remove_widget (is it random or not ?)
In another thread, it's written:

The 6 libGL.dylib 0x00007fff8769b022 glDeleteBuffers + 18

Never do gl command in another thread than main thread... Now why it's happening, i've absolutly no fucking idea >_<

[tito]

That's very weird. I'll do the same approach than texture: put the vbo deletion in a list, and trigger the list in a Clock, from the main thread. Thanks a lot for reporting !

[a-zb]

I don't think it's an issue about remove_widget (is it random or not ?)

Happens randomly - yes, but always on touch_up . If the remove_widget is commented out, it works forever - it does not crash. Also, if I keep my finger on the touchpad the whole time and don't lift it up, it runs forever as well. ...
I wish I knew more about kivy to help out with the fix, so that's all that I know for now.

[tito]

areksb, can you pull the master version, recompile, and test if it's works better for your case ? Since i didn't be able to trigger it, i want to ensure that this fix will do the job. Thanks !