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[Daniel van Vugt <daniel.van.vugt@xxxxxxxxxxxxx>]

** Changed in: mir
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1416482

Title:
  segfault in mir::compositor::GLProgramFamily::Shader::init()

Status in Mir:
  Fix Released
Status in mir package in Ubuntu:
  Fix Released

Bug description:
  This is intermittent (so I'm not sure if there are other ways to
  reproduce) but Initial experiments suggest this comes of running
  mir_demo_server with the option "--display-config sidebyside" (and two
  monitors).

  Here's some gdb of a core:

  (gdb) info threads
    Id   Target Id         Frame 
    8    Thread 0x7f3e8effd700 (LWP 4942) 0x00007f3e9cbb8e1d in close () at ../sysdeps/unix/syscall-template.S:81
    7    Thread 0x7f3e8f7fe700 (LWP 4941) 0x00007f3e9c3b1283 in select () at ../sysdeps/unix/syscall-template.S:81
    6    Thread 0x7f3e8e7fc700 (LWP 4943) 0x00007f3e9c3b9ee3 in epoll_wait () at ../sysdeps/unix/syscall-template.S:81
    5    Thread 0x7f3e95b6a700 (LWP 4937) pthread_cond_wait@@GLIBC_2.3.2 ()
      at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
    4    Thread 0x7f3e95369700 (LWP 4938) 0x00007f3e9c3b9ee3 in epoll_wait () at ../sysdeps/unix/syscall-template.S:81
    3    Thread 0x7f3e94b68700 (LWP 4939) pthread_cond_wait@@GLIBC_2.3.2 ()
      at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
    2    Thread 0x7f3e9dd22780 (LWP 4935) 0x00007f3e9c3af45d in poll () at ../sysdeps/unix/syscall-template.S:81
  * 1    Thread 0x7f3e8ffff700 (LWP 4940) 0x00007f3e9683bc2b in ?? () from /usr/lib/x86_64-linux-gnu/dri/i965_dri.so
  (gdb) bt
  #0  0x00007f3e9683bc2b in ?? () from /usr/lib/x86_64-linux-gnu/dri/i965_dri.so
  #1  0x00007f3e9683bc89 in ?? () from /usr/lib/x86_64-linux-gnu/dri/i965_dri.so
  #2  0x00007f3e9683c1f5 in ?? () from /usr/lib/x86_64-linux-gnu/dri/i965_dri.so
  #3  0x00007f3e96816ec7 in ?? () from /usr/lib/x86_64-linux-gnu/dri/i965_dri.so
  #4  0x00007f3e9686169f in ?? () from /usr/lib/x86_64-linux-gnu/dri/i965_dri.so
  #5  0x00007f3e966fbfcf in ?? () from /usr/lib/x86_64-linux-gnu/dri/i965_dri.so
  #6  0x00007f3e9d60d542 in mir::compositor::GLProgramFamily::Shader::init (this=0x7f3e80002550, type=35632, 
      src=0x7f3e9d7a09a8 "precision mediump float;\nuniform sampler2D tex;\nuniform float alpha;\nvarying vec2 v_texcoord;\nvoid main() {\n   vec4 frag = texture2D(tex, v_texcoord);\n   gl_FragColor = alpha*frag;\n}\n")
      at /home/alan/display_server/mir3/src/server/compositor/gl_program_family.cpp:31
  #7  0x00007f3e9d60d9fa in mir::compositor::GLProgramFamily::add_program (this=0x7f3e800009f0, 
      vshader_src=0x7f3e9d7a0808 "attribute vec3 position;\nattribute vec2 texcoord;\nuniform mat4 screen_to_gl_coords;\nuniform mat4 display_transform;\nuniform mat4 transform;\nuniform vec2 centre;\nvarying vec2 v_texcoord;\nvoid main() {\n"..., 
      fshader_src=0x7f3e9d7a09a8 "precision mediump float;\nuniform sampler2D tex;\nuniform float alpha;\nvarying vec2 v_texcoord;\nvoid main() {\n   vec4 frag = texture2D(tex, v_texcoord);\n   gl_FragColor = alpha*frag;\n}\n")
      at /home/alan/display_server/mir3/src/server/compositor/gl_program_family.cpp:80
  #8  0x00007f3e9d6090e5 in mir::compositor::GLRenderer::GLRenderer(std::unique_ptr<mir::graphics::GLTextureCache, std::default_delete<mir::graphics::GLTextureCache> >&&, mir::geometry::Rectangle const&, mir::compositor::DestinationAlpha) (
      this=0x7f3e800009d0, texture_cache=<unknown type in bin/../lib/libmirserver.so.29, CU 0x4bf826, DIE 0x4d008e>, 
      display_area=..., dest_alpha=mir::compositor::DestinationAlpha::opaque)
      at /home/alan/display_server/mir3/src/server/compositor/gl_renderer.cpp:102
  #9  0x00007f3e9d60cb45 in mir::compositor::GLRendererFactory::create_renderer_for (this=0x26c7cb0, rect=..., 
      dest_alpha=mir::compositor::DestinationAlpha::opaque)
      at /home/alan/display_server/mir3/src/server/compositor/gl_renderer_factory.cpp:35
  #10 0x00007f3e9d603764 in mir::compositor::DefaultDisplayBufferCompositorFactory::create_compositor_for (this=0x2585d00, 
      display_buffer=...)
      at /home/alan/display_server/mir3/src/server/compositor/default_display_buffer_compositor_factory.cpp:44

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