Tuve un problema similar con él. Por alguna razón, se llama sdl2 lugar de gl para Backend. No sé si hay una solución permanente para esto, pero después de un tiempo tratando de encontrar una solución, la única solución que se me ocurrió es agregar 2 líneas en la parte superior de su aplicación, antes de importar Kivy. Debería verse así:

import os
os.environ['KIVY_GL_BACKEND'] = 'gl'
import kivy

Espero que te ayude. ¡Buena suerte!

Ps Si desea ejecutar su aplicación en Windows, es posible que desee comentar os.environ['KIVY_GL_BACKEND'] = 'gl' contrario, no se ejecutará.

Recibo el mismo error en el Zero W. La sugerencia de @goadik arregló el 3B + para mí, todavía no he probado el Zero.

¡También confirmo que la solución de @goadik funciona! Y también señalo que como es un problema de variable de entorno, simplemente puede exportar la variable de la siguiente manera:

export KIVY_GL_BACKEND=gl

Y luego ejecuta el script.

SDL2 se utiliza para buscar dinámicamente el símbolo.
Sería bueno tener un seguimiento para comprender y solucionar el problema.
El cambio al backend GL para rpi podría implementarse dependiendo de la plataforma, pero prefiero solucionar el problema subyacente.

Utilice gdb --args python main.py , escriba r , luego, cuando se bloquee, haga bt all . Publica todas las cosas.

Bueno. Esta es la salida para gdb --args python main.py :

GNU gdb (Raspbian 7.12-6) 7.12.0.20161007-git
Copyright (C) 2016 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "arm-linux-gnueabihf".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
<http://www.gnu.org/software/gdb/documentation/>.
For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from python3...(no debugging symbols found)...done.
(gdb) r
Starting program: /usr/bin/python3 main.py
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/arm-linux-gnueabihf/libthread_db.so.1".
[INFO   ] [Logger      ] Record log in /home/pi/.kivy/logs/kivy_18-10-27_0.txt
[INFO   ] [Image       ] Providers: img_tex, img_dds, img_sdl2, img_pil, img_gif (img_ffpyplayer ignored)
[INFO   ] [Kivy        ] v1.11.0.dev0, git-916b77b, 20181022
[INFO   ] [Python      ] v3.5.3 (default, Sep 27 2018, 17:25:39) 
[GCC 6.3.0 20170516]
[INFO   ] [Factory     ] 184 symbols loaded
[DEBUG  ] [App         ] Loading kv <./main.kv>
[DEBUG  ] [App         ] kv <./main.kv> not found
[INFO   ] [Window      ] Provider: egl_rpi
[New Thread 0x74758470 (LWP 973)]
[New Thread 0x73dff470 (LWP 974)]
[New Thread 0x735ff470 (LWP 975)]
[New Thread 0x72dff470 (LWP 976)]
[DEBUG  ] [Window      ] Actual display size: 800x480
[INFO   ] [GL          ] Using the "OpenGL ES 2" graphics system
[DEBUG  ] [GL          ] glActiveTexture is not available
[DEBUG  ] [GL          ] glAttachShader is not available
[DEBUG  ] [GL          ] glBindAttribLocation is not available
[DEBUG  ] [GL          ] glBindBuffer is not available
[DEBUG  ] [GL          ] glBindFramebuffer is not available
[DEBUG  ] [GL          ] glBindRenderbuffer is not available
[DEBUG  ] [GL          ] glBindTexture is not available
[DEBUG  ] [GL          ] glBlendColor is not available
[DEBUG  ] [GL          ] glBlendEquation is not available
[DEBUG  ] [GL          ] glBlendEquationSeparate is not available
[DEBUG  ] [GL          ] glBlendFunc is not available
[DEBUG  ] [GL          ] glBlendFuncSeparate is not available
[DEBUG  ] [GL          ] glBufferData is not available
[DEBUG  ] [GL          ] glBufferSubData is not available
[DEBUG  ] [GL          ] glCheckFramebufferStatus is not available
[DEBUG  ] [GL          ] glClear is not available
[DEBUG  ] [GL          ] glClearColor is not available
[DEBUG  ] [GL          ] glClearStencil is not available
[DEBUG  ] [GL          ] glColorMask is not available
[DEBUG  ] [GL          ] glCompileShader is not available
[DEBUG  ] [GL          ] glCompressedTexImage2D is not available
[DEBUG  ] [GL          ] glCompressedTexSubImage2D is not available
[DEBUG  ] [GL          ] glCopyTexImage2D is not available
[DEBUG  ] [GL          ] glCopyTexSubImage2D is not available
[DEBUG  ] [GL          ] glCreateProgram is not available
[DEBUG  ] [GL          ] glCreateShader is not available
[DEBUG  ] [GL          ] glCullFace is not available
[DEBUG  ] [GL          ] glDeleteBuffers is not available
[DEBUG  ] [GL          ] glDeleteFramebuffers is not available
[DEBUG  ] [GL          ] glDeleteProgram is not available
[DEBUG  ] [GL          ] glDeleteRenderbuffers is not available
[DEBUG  ] [GL          ] glDeleteShader is not available
[DEBUG  ] [GL          ] glDeleteTextures is not available
[DEBUG  ] [GL          ] glDepthFunc is not available
[DEBUG  ] [GL          ] glDepthMask is not available
[DEBUG  ] [GL          ] glDetachShader is not available
[DEBUG  ] [GL          ] glDisable is not available
[DEBUG  ] [GL          ] glDisableVertexAttribArray is not available
[DEBUG  ] [GL          ] glDrawArrays is not available
[DEBUG  ] [GL          ] glDrawElements is not available
[DEBUG  ] [GL          ] glEnable is not available
[DEBUG  ] [GL          ] glEnableVertexAttribArray is not available
[DEBUG  ] [GL          ] glFinish is not available
[DEBUG  ] [GL          ] glFlush is not available
[DEBUG  ] [GL          ] glFramebufferRenderbuffer is not available
[DEBUG  ] [GL          ] glFramebufferTexture2D is not available
[DEBUG  ] [GL          ] glFrontFace is not available
[DEBUG  ] [GL          ] glGenBuffers is not available
[DEBUG  ] [GL          ] glGenerateMipmap is not available
[DEBUG  ] [GL          ] glGenFramebuffers is not available
[DEBUG  ] [GL          ] glGenRenderbuffers is not available
[DEBUG  ] [GL          ] glGenTextures is not available
[DEBUG  ] [GL          ] glGetActiveAttrib is not available
[DEBUG  ] [GL          ] glGetActiveUniform is not available
[DEBUG  ] [GL          ] glGetAttachedShaders is not available
[DEBUG  ] [GL          ] glGetAttribLocation is not available
[DEBUG  ] [GL          ] glGetBooleanv is not available
[DEBUG  ] [GL          ] glGetBufferParameteriv is not available
[DEBUG  ] [GL          ] glGetError is not available
[DEBUG  ] [GL          ] glGetFloatv is not available
[DEBUG  ] [GL          ] glGetFramebufferAttachmentParameteriv is not available
[DEBUG  ] [GL          ] glGetIntegerv is not available
[DEBUG  ] [GL          ] glGetProgramInfoLog is not available
[DEBUG  ] [GL          ] glGetProgramiv is not available
[DEBUG  ] [GL          ] glGetRenderbufferParameteriv is not available
[DEBUG  ] [GL          ] glGetShaderInfoLog is not available
[DEBUG  ] [GL          ] glGetShaderiv is not available
[DEBUG  ] [GL          ] glGetShaderSource is not available
[DEBUG  ] [GL          ] glGetString is not available
[DEBUG  ] [GL          ] glGetTexParameterfv is not available
[DEBUG  ] [GL          ] glGetTexParameteriv is not available
[DEBUG  ] [GL          ] glGetUniformfv is not available
[DEBUG  ] [GL          ] glGetUniformiv is not available
[DEBUG  ] [GL          ] glGetUniformLocation is not available
[DEBUG  ] [GL          ] glGetVertexAttribfv is not available
[DEBUG  ] [GL          ] glGetVertexAttribiv is not available
[DEBUG  ] [GL          ] glHint is not available
[DEBUG  ] [GL          ] glIsBuffer is not available
[DEBUG  ] [GL          ] glIsEnabled is not available
[DEBUG  ] [GL          ] glIsFramebuffer is not available
[DEBUG  ] [GL          ] glIsProgram is not available
[DEBUG  ] [GL          ] glIsRenderbuffer is not available
[DEBUG  ] [GL          ] glIsShader is not available
[DEBUG  ] [GL          ] glIsTexture is not available
[DEBUG  ] [GL          ] glLineWidth is not available
[DEBUG  ] [GL          ] glLinkProgram is not available
[DEBUG  ] [GL          ] glPixelStorei is not available
[DEBUG  ] [GL          ] glPolygonOffset is not available
[DEBUG  ] [GL          ] glReadPixels is not available
[DEBUG  ] [GL          ] glRenderbufferStorage is not available
[DEBUG  ] [GL          ] glSampleCoverage is not available
[DEBUG  ] [GL          ] glScissor is not available
[DEBUG  ] [GL          ] glShaderBinary is not available
[DEBUG  ] [GL          ] glShaderSource is not available
[DEBUG  ] [GL          ] glStencilFunc is not available
[DEBUG  ] [GL          ] glStencilFuncSeparate is not available
[DEBUG  ] [GL          ] glStencilMask is not available
[DEBUG  ] [GL          ] glStencilMaskSeparate is not available
[DEBUG  ] [GL          ] glStencilOp is not available
[DEBUG  ] [GL          ] glStencilOpSeparate is not available
[DEBUG  ] [GL          ] glTexImage2D is not available
[DEBUG  ] [GL          ] glTexParameterf is not available
[DEBUG  ] [GL          ] glTexParameteri is not available
[DEBUG  ] [GL          ] glTexSubImage2D is not available
[DEBUG  ] [GL          ] glUniform1f is not available
[DEBUG  ] [GL          ] glUniform1fv is not available
[DEBUG  ] [GL          ] glUniform1i is not available
[DEBUG  ] [GL          ] glUniform1iv is not available
[DEBUG  ] [GL          ] glUniform2f is not available
[DEBUG  ] [GL          ] glUniform2fv is not available
[DEBUG  ] [GL          ] glUniform2i is not available
[DEBUG  ] [GL          ] glUniform2iv is not available
[DEBUG  ] [GL          ] glUniform3f is not available
[DEBUG  ] [GL          ] glUniform3fv is not available
[DEBUG  ] [GL          ] glUniform3i is not available
[DEBUG  ] [GL          ] glUniform3iv is not available
[DEBUG  ] [GL          ] glUniform4f is not available
[DEBUG  ] [GL          ] glUniform4fv is not available
[DEBUG  ] [GL          ] glUniform4i is not available
[DEBUG  ] [GL          ] glUniform4iv is not available
[DEBUG  ] [GL          ] glUniformMatrix4fv is not available
[DEBUG  ] [GL          ] glUseProgram is not available
[DEBUG  ] [GL          ] glValidateProgram is not available
[DEBUG  ] [GL          ] glVertexAttrib1f is not available
[DEBUG  ] [GL          ] glVertexAttrib2f is not available
[DEBUG  ] [GL          ] glVertexAttrib3f is not available
[DEBUG  ] [GL          ] glVertexAttrib4f is not available
[DEBUG  ] [GL          ] glVertexAttribPointer is not available
[DEBUG  ] [GL          ] glViewport is not available
[INFO   ] [GL          ] Backend used <sdl2>

Thread 1 "python3" received signal SIGSEGV, Segmentation fault.
0x00000000 in ?? ()

Además, como bt all ha arrojado un "Sin símbolo" todo "en el contexto actual". mensaje, tengo la salida de thread apply all bt , que es la siguiente:

Thread 5 (Thread 0x72dff470 (LWP 976)):
#0  0x76f88014 in futex_abstimed_wait_cancelable (private=0, abstime=0x0, 
    expected=1, futex_word=0x748885ec <cecservice_notify_available_event+24>)
    at ../sysdeps/unix/sysv/linux/futex-internal.h:205
#1  do_futex_wait (sem=sem@entry=0x748885ec <cecservice_notify_available_event+24>, 
    abstime=0x0) at sem_waitcommon.c:115
#2  0x76f88158 in __new_sem_wait_slow (
    sem=0x748885ec <cecservice_notify_available_event+24>, abstime=0x0)
    at sem_waitcommon.c:282
#3  0x7486ec44 in cecservice_notify_func () from /opt/vc/lib/libbcm_host.so
#4  0x747d7cc4 in vcos_thread_entry (arg=0x74888600 <cecservice_notify_task>)
    at /home/dc4/projects/staging/userland/interface/vcos/pthreads/vcos_pthreads.c:144
#5  0x76f7efc4 in start_thread (arg=0x72dff470) at pthread_create.c:335
#6  0x76e0cbc8 in ?? () at ../sysdeps/unix/sysv/linux/arm/clone.S:76
   from /lib/arm-linux-gnueabihf/libc.so.6
Backtrace stopped: previous frame identical to this frame (corrupt stack?)

Thread 4 (Thread 0x735ff470 (LWP 975)):
#0  0x76f88014 in futex_abstimed_wait_cancelable (private=0, abstime=0x0, 
    expected=1, futex_word=0x74887864 <tvservice_notify_available_event+24>)
    at ../sysdeps/unix/sysv/linux/futex-internal.h:205
#1  do_futex_wait (sem=sem@entry=0x74887864 <tvservice_notify_available_event+24>, 
    abstime=0x0) at sem_waitcommon.c:115
#2  0x76f88158 in __new_sem_wait_slow (
    sem=0x74887864 <tvservice_notify_available_event+24>, abstime=0x0)
---Type <return> to continue, or q <return> to quit---
    at sem_waitcommon.c:282
#3  0x7486e084 in tvservice_notify_func () from /opt/vc/lib/libbcm_host.so
#4  0x747d7cc4 in vcos_thread_entry (arg=0x74887878 <tvservice_notify_task>)
    at /home/dc4/projects/staging/userland/interface/vcos/pthreads/vcos_pthreads.c:144
#5  0x76f7efc4 in start_thread (arg=0x735ff470) at pthread_create.c:335
#6  0x76e0cbc8 in ?? () at ../sysdeps/unix/sysv/linux/arm/clone.S:76
   from /lib/arm-linux-gnueabihf/libc.so.6
Backtrace stopped: previous frame identical to this frame (corrupt stack?)

Thread 3 (Thread 0x73dff470 (LWP 974)):
#0  0x76f88014 in futex_abstimed_wait_cancelable (private=0, abstime=0x0, 
    expected=1, futex_word=0x748886e8 <dispmanx_notify_available_event+24>)
    at ../sysdeps/unix/sysv/linux/futex-internal.h:205
#1  do_futex_wait (sem=sem@entry=0x748886e8 <dispmanx_notify_available_event+24>, 
    abstime=0x0) at sem_waitcommon.c:115
#2  0x76f88158 in __new_sem_wait_slow (
    sem=0x748886e8 <dispmanx_notify_available_event+24>, abstime=0x0)
    at sem_waitcommon.c:282
#3  0x74872150 in dispmanx_notify_func () from /opt/vc/lib/libbcm_host.so
#4  0x747d7cc4 in vcos_thread_entry (arg=0x74889428 <dispmanx_notify_task>)
    at /home/dc4/projects/staging/userland/interface/vcos/pthreads/vcos_pthreads.c:144
#5  0x76f7efc4 in start_thread (arg=0x73dff470) at pthread_create.c:335
#6  0x76e0cbc8 in ?? () at ../sysdeps/unix/sysv/linux/arm/clone.S:76
   from /lib/arm-linux-gnueabihf/libc.so.6
Backtrace stopped: previous frame identical to this frame (corrupt stack?)
---Type <return> to continue, or q <return> to quit---

Thread 2 (Thread 0x74758470 (LWP 973)):
#0  0x76e0580c in ioctl () at ../sysdeps/unix/syscall-template.S:84
#1  0x747f1010 in completion_thread () from /opt/vc/lib/libvchiq_arm.so
#2  0x747d7cc4 in vcos_thread_entry (arg=0x74804318 <vchiq_instance+16>)
    at /home/dc4/projects/staging/userland/interface/vcos/pthreads/vcos_pthreads.c:144
#3  0x76f7efc4 in start_thread (arg=0x74758470) at pthread_create.c:335
#4  0x76e0cbc8 in ?? () at ../sysdeps/unix/sysv/linux/arm/clone.S:76
   from /lib/arm-linux-gnueabihf/libc.so.6
Backtrace stopped: previous frame identical to this frame (corrupt stack?)

Thread 1 (Thread 0x76ff7010 (LWP 967)):
#0  0x00000000 in ?? ()

#1  0x74bb28d0 in __pyx_pf_4kivy_8graphics_6opengl_138glGetString (
    __pyx_self=<optimized out>, __pyx_v_name=<optimized out>)
    at /tmp/pip-bp1kpwjd-build/kivy/graphics/opengl.c:12436
#2  __pyx_pw_4kivy_8graphics_6opengl_139glGetString (__pyx_self=<optimized out>, 
    __pyx_arg_name=<optimized out>)
    at /tmp/pip-bp1kpwjd-build/kivy/graphics/opengl.c:12415
#3  0x000b1df8 in PyEval_EvalFrameEx ()
#4  0x000b1a7c in PyEval_EvalFrameEx ()
#5  0x000b1a7c in PyEval_EvalFrameEx ()
#6  0x001985c8 in ?? ()
Backtrace stopped: previous frame identical to this frame (corrupt stack?)

OK, parece que SDL_GL_GetProcAddress no puede encontrar nada :( Lo entiendo ahora.
Nuestro método para detectar y cargar opengl está vinculado al proveedor de Windows utilizado.
Pero en este caso, se usa egl_rpi , no SDL2, por lo que la función SDL2 no funcionará.

Requiere una solución, ¡gracias por informar!

No estoy seguro de si es relevante agregarlo aquí, pero creo que tiene algo que ver con la nueva versión de Raspbian. Probé el más viejo (tengo una imagen) y funcionó a las mil maravillas.

El problema con la falla de segmentación al iniciar la aplicación se puede solucionar con una variable de entorno, pero también, se bloquea con la misma falla de segmentación cada vez que cargo el gráfico con muchos datos para mostrar.

El problema con GDB es que si trato de usarlo así gdb --args python main.py y replicar el bloqueo, el RPI simplemente se congela y lo único que queda por hacer en este punto es reiniciarlo. Cuando reviso los registros, están vacíos.

Quería agregarlo aquí.

Tuve el mismo problema y, como dijo @goadik , podría ser un error de la nueva versión de raspbian porque en mi imagen anterior (Raspberry3, kivy v1.11.0.dev0, python v3.4.2) la aplicación kivy está funcionando bien. Mi problema se describe aquí: https://stackoverflow.com/questions/53122908/kivy-opengl-segmentation-fault-on-raspberry

@krrrambambuli

en mi imagen anterior (Raspberry3, kivy v1.11.0.dev0, python v3.4.2) la aplicación kivy está funcionando bien

Entonces, ¿por qué no usas la imagen anterior?

Los desarrolladores de RPi son conocidos por lanzar nuevas "actualizaciones" que están rompiendo todo tipo de cosas. He tenido una experiencia tan desagradable con estos que he desactivado por completo todas las actualizaciones relacionadas con el sistema operativo que provienen de RPi org.

@ E3V3A

Entonces, ¿por qué no usas la imagen anterior?

Porque tenía un RPI que ya estaba configurado con la última actualización de raspbian. Y me preguntaba por qué kivy no se está ejecutando aunque yo estaba haciendo exactamente las mismas cosas que antes. ¡Ahora cambié a la imagen anterior y está funcionando bien!

A partir de ahora me ocuparé de las actualizaciones apresuradas;)

Quizás no tenga ninguna relación, pero a menos que me equivoque: Kivy depende de SDL2 y SDL2 depende de cffi y / o Cairo, y cffi es difícil de construir independientemente de la arquitectura. Pero me encontré con el siguiente paquete de pip, ¿quizás intentarlo?

# pip3 search cairocffi 
cairotft (0.1.2)   - UI library for small tft screens using cairocffi

@ E3V3A
Ya cambié a la imagen anterior. Tal vez sea bueno saberlo para el futuro

¿Puedo preguntarte qué imagen estás usando y dónde puedo encontrarla? Estoy usando Rpi 3 B + y kivy 1.11.0.dev0, ¿qué imagen debo usar?

@ E3V3A
Ya cambié a la imagen anterior. Tal vez sea bueno saberlo para el futuro

Estoy usando raspbian jessie, la última vez que actualicé el 11-6-18 sin actualizaciones. Rpi3, Kivy v1.10.1 y Python 3.4.2
Mi registro:

[INFO] Logger: registro de inicio de sesión /home/pi/.kivy/logs/kivy_18-11-14_11.txt
[INFORMACIÓN] Kivy: v1.10.1
[INFO] Python: v3.4.2 (predeterminado, 19 de octubre de 2014, 13:31:11)
[CGC 4.9.1]
[INFO] KivyMD: Versión de KivyMD: 0.1.2
[INFO] Fábrica: 194 símbolos cargados
[INFO] Imagen: Proveedores: img_tex, img_dds, img_sdl2, img_pil, img_gif (img_ffpyplayer ignorado)
[INFO] Ventana: Proveedor: egl_rpi
[INFO] GL: Uso del sistema de gráficos "OpenGL ES 2"
[INFO] GL: Backend usado
[INFO] GL: versión OpenGL [INFO] GL: proveedor de OpenGL [INFO] GL: renderizador OpenGL
[INFO] GL: Versión analizada de OpenGL: 2, 0
[INFO] GL: versión sombreada
[INFO] GL: Tamaño máximo de textura <2048>
[INFO] GL: Unidades máximas de textura <8>
[INFO] Ventana: teclado virtual permitido, modo multiusuario, no acoplado
[INFO] Texto: Proveedor: sdl2
[INFO] GL: El soporte de textura NPOT está disponible
[INFO] Portapapeles: Proveedor: xclip
[INFO] CutBuffer: compatibilidad con cortar búfer habilitada
[INFO] ProbeSysfs: coincidencia de dispositivo: / dev / input / event0
...