SEGFAULT on yakkety

[Alan Griffiths]

This seems to be a thing since the mesa 12.0.2 update on Yakkety

<dandrader> alan_g alan_g|afk I get this right after the ubuntu logo fades out: http://pastebin.ubuntu.com/23173719/
<dandrader> alan_g alan_g|afk with miral-shell

And I see it too.

[Alan Griffiths (alan-griffiths)]

Running under GDB I see:

ERROR: /home/alan/display_server/mir/src/platforms/mesa/server/kms/real_kms_output.cpp(302): Throw in function virtual void mir::graphics::mesa::RealKMSOutput::set_gamma(const mir::graphics::GammaCurves&)
Dynamic exception type: boost::exception_detail::clone_impl<boost::exception_detail::error_info_injector<std::system_error> >
std::exception::what: drmModeCrtcSetGamma Failed: Invalid argument

[Inferior 1 (process 1601) exited with code 01]

I *guess* the above segfault comes from catching this exception after the platform is unloaded.

[Alan Griffiths (alan-griffiths)]

The above exception is likely misleading. That code only exists on lp:mir, not in a release.

I still get a segfault with Mir 0.24:

MirEglApp::~MirEglApp()
{
    eglMakeCurrent(egldisplay, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
    if (dummy_surface != EGL_NO_SURFACE)
        destroy_surface(dummy_surface);
    eglDestroyContext(egldisplay, eglctx); <<=== SEGFAULT
    eglTerminate(egldisplay);
}

[Alan Griffiths (alan-griffiths)]

Any of mir_demo_client_egl* crash in much the same way running under Mir. miral-kiosk (which doesn't use egl internally) doesn't crash.

So this looks like a problem with egl. Not MirAL and (probably) not Mir