[Bug 79009] [g43] Missed irq leading to hard lockup

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=79009

Chris Wilson <chris at chris-wilson.co.uk> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Assignee|chris at chris-wilson.co.uk    |intel-gfx-bugs at lists.freede
                   |                            |sktop.org
                 CC|                            |intel-gfx-bugs at lists.freede
                   |                            |sktop.org
            Summary|Display hangs but mouse     |[g43] Missed irq leading to
                   |cursor moves, kernel        |hard lockup
                   |reports                     |
                   |"[drm:i915_hangcheck_elapse |
                   |d] *ERROR* Hangcheck timer  |
                   |elapsed... render ring      |
                   |idle", G43 chipset          |
            Product|xorg                        |DRI
            Version|7.7 (2011)                  |unspecified
          Component|Driver/intel                |DRM/Intel

--- Comment #2 from Chris Wilson <chris at chris-wilson.co.uk> ---
Hard lock? Not even ssh'able? It would be really useful to get the kernel and
userspace stack traces of the stuck processes.

After a missed irq, we start busy-waiting for the GPU rather than rely on any
more interrupts being received. Obviously that should not lead to a lock up.

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