https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=848895
there's a really strange and comprehensively cross-application intermittent bug that's only occurring on opengl-based applications, that's been introduced some time in the past year. to be absolutely honest nobody's even sure it's actually opengl-related or whether it's x11 related, but it's so weird that it's really hard to pin down. the above bugreport on debian with chromium-browser is *just one* of the occurrences, but it occurs with glxgears, openscad and a whole stack of other applications. the simplest 100% guaranteed way discovered so far to reproduce the issue is: * install debian / testing * install fvwm2 * set up fvwm2 to use "wireframe" for "resize window" * run glxgears * go ahead and resize the glxgears window with a mouse that is *guaranteed* to result in glxgears "freezing". the only known guaranteed way to "recover" it is to switch to text console (ctrl-alt-f1) followed by switching back to X11 (ctrl-alt-f7). there are various teams trying to "fix" this bug, believing it to be the fault of their application. this includes the chromium-browser team. what they've managed to do so far is to simply... avoid *most* circumstances under which the lock-up occurs... but all that happens is that the processor running the application goes into multi-tasking meltdown... *and then still* gets a lock-up. it doesn't matter what underlying hardware is used: intel graphics, nvidia, ATI. it doesn't even matter if you use optirun: that *still* results in a lockup although there you get a rather useful error message indicating that the GPU is trying to do its job, but reports constantly that the frame had to be dropped. anyway, apologies: nobody whose applications are affected by this really has a clue where the *actual* bug is so i am escalating it down the chain of library dependencies, making people aware. it could be X11, it could be mesa, we just don't know. l. _______________________________________________ mesa-dev mailing list mesa-dev@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/mesa-dev