#0  0x00007f58d568706c in pushbuf_kref () from /tmp/apport_sandbox_ZyMo9z/usr/lib/x86_64-linux-gnu/libdrm_nouveau.so.2
#1  0x00007f58d5687729 in pushbuf_validate () from /tmp/apport_sandbox_ZyMo9z/usr/lib/x86_64-linux-gnu/libdrm_nouveau.so.2
#2  0x00007f58d5d72d46 in nv50_flush () from /tmp/apport_sandbox_ZyMo9z/usr/lib/x86_64-linux-gnu/dri/nouveau_dri.so
#3  0x00007f58d5aa69d4 in st_glFlush () from /tmp/apport_sandbox_ZyMo9z/usr/lib/x86_64-linux-gnu/dri/nouveau_dri.so
#4  0x00007f58dc324ed1 in dri2_make_current () from /tmp/apport_sandbox_ZyMo9z/usr/lib/x86_64-linux-gnu/mesa-egl/libEGL.so.1
#5  0x00007f58dc31bb9c in eglMakeCurrent () from /tmp/apport_sandbox_ZyMo9z/usr/lib/x86_64-linux-gnu/mesa-egl/libEGL.so.1
#6  0x00007f58dcb33495 in mir::graphics::nested::detail::DisplayBuffer::make_current (this=0x7f58cc0787c0) at /build/mir-iu3Rou/mir-0.20.1+16.04.20160225.1/src/server/graphics/nested/display_buffer.cpp:62
  [Error: display_buffer.cpp was not found in source tree]
#7  0x00007f58dce1900d in MirOpenGLContext::makeCurrent (this=<optimized out>, surface=0x1d23740) at /build/qtmir-gles-OZnxci/qtmir-gles-0.4.7+16.04.20160219/src/platforms/mirserver/miropenglcontext.cpp:134
  [Error: miropenglcontext.cpp was not found in source tree]
#8  0x00007f58e61755ac in QOpenGLContext::makeCurrent(QSurface*) () from /tmp/apport_sandbox_ZyMo9z/usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#9  0x00007f58e66fcfd3 in QSGRenderThread::sync(bool) () from /tmp/apport_sandbox_ZyMo9z/usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#10 0x00007f58e66fe245 in QSGRenderThread::syncAndRender() () from /tmp/apport_sandbox_ZyMo9z/usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#11 0x00007f58e670332c in QSGRenderThread::run() () from /tmp/apport_sandbox_ZyMo9z/usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#12 0x00007f58e58097ce in QThreadPrivate::start(void*) () from /tmp/apport_sandbox_ZyMo9z/usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#13 0x00007f58e391f66a in start_thread (arg=0x7f5865bfe700) at pthread_create.c:333
  [Error: pthread_create.c was not found in source tree]
#14 0x00007f58e4f0901d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109
  [Error: clone.S was not found in source tree]