Linux App hangs on right mouse button drag

[kellerkindt]

On Linux, when dragging the mouse over any widget, the app just hangs and can only be closed by sending a SIGKILL.

Accurate steps to reproduce:

• Hover with the mouse over a widget
• Press the right mousebutton
• Move the mouse

(A transparent, red circle will appear where the button was pressed)

The following code is able to reproduce the problem:

import kivy
kivy.require('1.0.7')

from kivy.app import App
from kivy.uix.button import Button

class TestApp(App):
    def build(self):
        return Button(text="Button 1")

if __name__ == '__main__':
    TestApp().run()

The output of the program:

[INFO   ] Kivy v1.7.2
[INFO   ] [Logger      ] Record log in /share/home/michael/.kivy/logs/kivy_15-07-23_52.txt
[INFO   ] [Factory     ] 144 symbols loaded
[DEBUG  ] [Cache       ] register <kv.lang> with limit=None, timeout=Nones
[DEBUG  ] [Cache       ] register <kv.image> with limit=None, timeout=60s
[DEBUG  ] [Cache       ] register <kv.atlas> with limit=None, timeout=Nones
3
3.1415926
Python
358315791
(2+3j)
[INFO   ] [Image       ] Providers: img_tex, img_dds, img_pygame, img_pil, img_gif 
[DEBUG  ] [Cache       ] register <kv.texture> with limit=1000, timeout=60s
[DEBUG  ] [Cache       ] register <kv.shader> with limit=1000, timeout=3600s
[INFO   ] [Text        ] Provider: pygame
[DEBUG  ] [App         ] Loading kv <./test.kv>
[DEBUG  ] [Window      ] Ignored <egl_rpi> (import error)
[INFO   ] [Window      ] Provider: pygame(['window_egl_rpi'] ignored)
[DEBUG  ] [Window      ] Display driver x11
[DEBUG  ] [Window      ] Actual window size: 800x600
[DEBUG  ] [Window      ] Actual color bits r8 g8 b8 a0
[DEBUG  ] [Window      ] Actual depth bits: 24
[DEBUG  ] [Window      ] Actual stencil bits: 8
[DEBUG  ] [Window      ] Actual multisampling samples: 4
[INFO   ] [GL          ] OpenGL version <3.0 Mesa 10.6.2>
[INFO   ] [GL          ] OpenGL vendor <Intel Open Source Technology Center>
[INFO   ] [GL          ] OpenGL renderer <Mesa DRI Intel(R) Ivybridge Mobile >
[INFO   ] [GL          ] OpenGL parsed version: 3, 0
[INFO   ] [GL          ] Shading version <1.30>
[INFO   ] [GL          ] Texture max size <8192>
[INFO   ] [GL          ] Texture max units <16>
[DEBUG  ] [Shader      ] Fragment compiled successfully
[DEBUG  ] [Shader      ] Vertex compiled successfully
[DEBUG  ] [ImagePygame ] Load </usr/lib/python2.7/dist-packages/kivy/data/glsl/default.png>
[INFO   ] [Window      ] virtual keyboard not allowed, single mode, not docked
[DEBUG  ] [Atlas       ] Load </usr/lib/python2.7/dist-packages/kivy/data/../data/images/defaulttheme.atlas>
[DEBUG  ] [Atlas       ] Need to load 1 images
[DEBUG  ] [Atlas       ] Load </usr/lib/python2.7/dist-packages/kivy/data/../data/images/defaulttheme-0.png>
[DEBUG  ] [ImagePygame ] Load </usr/lib/python2.7/dist-packages/kivy/data/../data/images/defaulttheme-0.png>
[INFO   ] [OSC         ] using <multiprocessing> for socket
[DEBUG  ] [Base        ] Create provider from mouse
[DEBUG  ] [Base        ] Create provider from probesysfs
[DEBUG  ] [ProbeSysfs  ] using probsysfs!
[DEBUG  ] [ProbeSysfs  ] found device: ETPS/2 Elantech Touchpad at /dev/input/event4
[INFO   ] [ProbeSysfs  ] device match: /dev/input/event4
[INFO   ] [MTD         ] Read event from </dev/input/event4>
[INFO   ] [Base        ] Start application main loop
[INFO   ] [GL          ] NPOT texture support is available
 Exception in thread Thread-1:
 Traceback (most recent call last):
   File "/usr/lib/python2.7/threading.py", line 810, in __bootstrap_inner
     self.run()
   File "/usr/lib/python2.7/threading.py", line 763, in run
     self.__target(*self.__args, **self.__kwargs)
   File "/usr/lib/python2.7/dist-packages/kivy/input/providers/mtdev.py", line 192, in _thread_run
     _device = Device(_fn)
   File "/usr/lib/python2.7/dist-packages/kivy/lib/mtdev.py", line 131, in __init__
     self._fd = os.open(filename, os.O_NONBLOCK | os.O_RDONLY)
 OSError: [Errno 13] Permission denied: '/dev/input/event4'

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[inclement]

I haven't been able to reproduce this in master, but your version of kivy is quite old. Could you try with 1.9, the current version?

[kellerkindt]

Still happens with 1.9.0

[INFO   ] [Logger      ] Record log in /share/home/michael/.kivy/logs/kivy_15-07-23_54.txt
[INFO   ] [Kivy        ] v1.9.0
[INFO   ] [Python      ] v2.7.6 (default, Jun 22 2015, 17:58:13) 
[GCC 4.8.2]
[INFO   ] [Factory     ] 173 symbols loaded
3
3.1415926
Python
358315791
(2+3j)
[INFO   ] [Image       ] Providers: img_tex, img_dds, img_gif, img_sdl2, img_pil (img_ffpyplayer ignored)
[INFO   ] [Text        ] Provider: sdl2
[INFO   ] [OSC         ] using <multiprocessing> for socket
[INFO   ] [Window      ] Provider: sdl2(['window_egl_rpi'] ignored)
[INFO   ] [GL          ] OpenGL version <3.0 Mesa 10.6.2>
[INFO   ] [GL          ] OpenGL vendor <Intel Open Source Technology Center>
[INFO   ] [GL          ] OpenGL renderer <Mesa DRI Intel(R) Ivybridge Mobile >
[INFO   ] [GL          ] OpenGL parsed version: 3, 0
[INFO   ] [GL          ] Shading version <1.30>
[INFO   ] [GL          ] Texture max size <8192>
[INFO   ] [GL          ] Texture max units <16>
[INFO   ] [Window      ] auto add sdl2 input provider
[INFO   ] [Window      ] virtual keyboard not allowed, single mode, not docked
[INFO   ] [ProbeSysfs  ] device match: /dev/input/event4
[INFO   ] [MTD         ] Read event from </dev/input/event4>
[INFO   ] [Base        ] Start application main loop
[INFO   ] [GL          ] NPOT texture support is available
 Exception in thread Thread-1:
 Traceback (most recent call last):
   File "/usr/lib/python2.7/threading.py", line 810, in __bootstrap_inner
     self.run()
   File "/usr/lib/python2.7/threading.py", line 763, in run
     self.__target(*self.__args, **self.__kwargs)
   File "/usr/lib/python2.7/dist-packages/kivy/input/providers/mtdev.py", line 197, in _thread_run
     _device = Device(_fn)
   File "/usr/lib/python2.7/dist-packages/kivy/lib/mtdev.py", line 131, in __init__
     self._fd = os.open(filename, os.O_NONBLOCK | os.O_RDONLY)
 OSError: [Errno 13] Permission denied: '/dev/input/event4'

[kived]

This is not an error, unless you have a multitouch touchscreen which is not set up as a core pointer (mouse) in X and you intend to use it fullscreen with Kivy.

Kivy is trying to open a device to which it does not have access - this is almost always due to a laptop touchpad, which you do not want to use as an absolute multitouch device anyway. This can be safely ignored, as it doesn't cause any issues in any app.

 Exception in thread Thread-1:
 Traceback (most recent call last):
   File "/usr/lib/python2.7/threading.py", line 810, in __bootstrap_inner
     self.run()
   File "/usr/lib/python2.7/threading.py", line 763, in run
     self.__target(*self.__args, **self.__kwargs)
   File "/usr/lib/python2.7/dist-packages/kivy/input/providers/mtdev.py", line 197, in _thread_run
     _device = Device(_fn)
   File "/usr/lib/python2.7/dist-packages/kivy/lib/mtdev.py", line 131, in __init__
     self._fd = os.open(filename, os.O_NONBLOCK | os.O_RDONLY)
 OSError: [Errno 13] Permission denied: '/dev/input/event4'

[kived]

As for the freeze, I cannot duplicate this either, nor have I ever seen this issue (and I've been working with Kivy on Linux since 1.7.2).

Demo Video:

Also, where does this come from in the log output:

3
3.1415926
Python
358315791
(2+3j)

[akshayaurora]

@kellerkindt please add steps to reproduce and re-open

[akshayaurora]

Though it's not reproducible this issue could arise cause of buggy drivers please enable trace in the logs so we can see more on what's going on and post the log.

In config.ini set log_level to trace then run your app.

[kellerkindt]

Does now work, output for the same hardware (but now Linux Mint 17.3 4.4.0-14-generic):

[INFO   ] Kivy v1.7.2
[INFO   ] [Logger      ] Record log in /share/home/michael/.kivy/logs/kivy_16-04-24_2.txt
[INFO   ] [Factory     ] 144 symbols loaded
[DEBUG  ] [Cache       ] register <kv.lang> with limit=None, timeout=Nones
[DEBUG  ] [Cache       ] register <kv.image> with limit=None, timeout=60s
[DEBUG  ] [Cache       ] register <kv.atlas> with limit=None, timeout=Nones
[INFO   ] [Image       ] Providers: img_tex, img_dds, img_pygame, img_pil, img_gif 
[DEBUG  ] [Cache       ] register <kv.texture> with limit=1000, timeout=60s
[DEBUG  ] [Cache       ] register <kv.shader> with limit=1000, timeout=3600s
[INFO   ] [Text        ] Provider: pygame
[DEBUG  ] [App         ] Loading kv <./test.kv>
[DEBUG  ] [App         ] kv <./test.kv> not found
[DEBUG  ] [Window      ] Ignored <egl_rpi> (import error)
[INFO   ] [Window      ] Provider: pygame(['window_egl_rpi'] ignored)
[DEBUG  ] [Window      ] Display driver x11
[DEBUG  ] [Window      ] Actual window size: 800x600
[DEBUG  ] [Window      ] Actual color bits r8 g8 b8 a8
[DEBUG  ] [Window      ] Actual depth bits: 24
[DEBUG  ] [Window      ] Actual stencil bits: 8
[DEBUG  ] [Window      ] Actual multisampling samples: 4
[INFO   ] [GL          ] OpenGL version <3.0 Mesa 10.1.3>
[INFO   ] [GL          ] OpenGL vendor <Intel Open Source Technology Center>
[INFO   ] [GL          ] OpenGL renderer <Mesa DRI Intel(R) Ivybridge Mobile >
[INFO   ] [GL          ] OpenGL parsed version: 3, 0
[INFO   ] [GL          ] Shading version <1.30>
[INFO   ] [GL          ] Texture max size <8192>
[INFO   ] [GL          ] Texture max units <16>
[DEBUG  ] [Shader      ] Fragment compiled successfully
[DEBUG  ] [Shader      ] Vertex compiled successfully
[DEBUG  ] [ImagePygame ] Load </usr/lib/python2.7/dist-packages/kivy/data/glsl/default.png>
[INFO   ] [Window      ] virtual keyboard not allowed, single mode, not docked
[DEBUG  ] [Atlas       ] Load </usr/lib/python2.7/dist-packages/kivy/data/../data/images/defaulttheme.atlas>
[DEBUG  ] [Atlas       ] Need to load 1 images
[DEBUG  ] [Atlas       ] Load </usr/lib/python2.7/dist-packages/kivy/data/../data/images/defaulttheme-0.png>
[DEBUG  ] [ImagePygame ] Load </usr/lib/python2.7/dist-packages/kivy/data/../data/images/defaulttheme-0.png>
[INFO   ] [OSC         ] using <multiprocessing> for socket
[DEBUG  ] [Base        ] Create provider from mouse
[DEBUG  ] [Base        ] Create provider from probesysfs
[DEBUG  ] [ProbeSysfs  ] using probsysfs!
[DEBUG  ] [ProbeSysfs  ] found device: ETPS/2 Elantech Touchpad at /dev/input/event6
[INFO   ] [ProbeSysfs  ] device match: /dev/input/event6
[INFO   ] [MTD         ] Read event from </dev/input/event6>
[INFO   ] [Base        ] Start application main loop
[INFO   ] [GL          ] NPOT texture support is available
 Exception in thread Thread-1:
 Traceback (most recent call last):
   File "/usr/lib/python2.7/threading.py", line 810, in __bootstrap_inner
     self.run()
   File "/usr/lib/python2.7/threading.py", line 763, in run
     self.__target(*self.__args, **self.__kwargs)
   File "/usr/lib/python2.7/dist-packages/kivy/input/providers/mtdev.py", line 192, in _thread_run
     _device = Device(_fn)
   File "/usr/lib/python2.7/dist-packages/kivy/lib/mtdev.py", line 131, in __init__
     self._fd = os.open(filename, os.O_NONBLOCK | os.O_RDONLY)
 OSError: [Errno 13] Permission denied: '/dev/input/event6'

[INFO   ] [Base        ] Leaving application in progress... 

Probably a driver issue (looking at you, retarded amd mobile gpu that always causes issues somehow)

[dessant]

@kellerkindt, the Kivy version you're running was released 3 years ago. Reopen if the issue is still there after you've uninstalled all the other versions and installed the latest release.