Created attachment 134978 [details] GPU crash dump Hi, When resuming from hibernation on a Thinkpad Carbon X1, I got the following message from the kernel: Oct 21 18:36:07 thinkpad kernel: [ 596.840614] [drm] GPU HANG: ecode 9:0:0x5fc8cb4d, in Xorg [3647], reason: Hang on render ring, action: reset Oct 21 18:36:07 thinkpad kernel: [ 596.840616] [drm] GPU hangs can indicate a bug anywhere in the entire gfx stack, including userspace. Oct 21 18:36:07 thinkpad kernel: [ 596.840618] [drm] Please file a _new_ bug report on bugs.freedesktop.org against DRI -> DRM/Intel Oct 21 18:36:07 thinkpad kernel: [ 596.840618] [drm] drm/i915 developers can then reassign to the right component if it's not a kernel issue. Oct 21 18:36:07 thinkpad kernel: [ 596.840620] [drm] The gpu crash dump is required to analyze gpu hangs, so please always attach it. Oct 21 18:36:07 thinkpad kernel: [ 596.840621] [drm] GPU crash dump saved to /sys/class/drm/card0/error Oct 21 18:36:07 thinkpad kernel: [ 596.840668] drm/i915: Resetting chip after gpu hang Oct 21 18:36:07 thinkpad kernel: [ 596.840725] [drm] RC6 on Oct 21 18:36:07 thinkpad kernel: [ 596.860966] [drm] GuC firmware load skipped Oct 21 18:36:16 thinkpad kernel: [ 605.864564] drm/i915: Resetting chip after gpu hang Oct 21 18:36:16 thinkpad kernel: [ 605.864627] [drm] RC6 on Oct 21 18:36:16 thinkpad kernel: [ 605.882653] [drm] GuC firmware load skipped As requested, I am thus filing this bug.
commit bafb2f7d4755bf1571bd5e9a03b97f3fc4fe69ae Author: Chris Wilson <chris@chris-wilson.co.uk> Date: Wed Sep 21 14:51:08 2016 +0100 drm/i915/execlists: Reset RING registers upon resume There is a disparity in the context image saved to disk and our own bookkeeping - that is we presume the RING_HEAD and RING_TAIL match our stored ce->ring->tail value. However, as we emit WA_TAIL_DWORDS into the ring but may not tell the GPU about them, the GPU may be lagging behind our bookkeeping. Upon hibernation we do not save stolen pages, presuming that their contents are volatile. This means that although we start writing into the ring at tail, the GPU starts executing from its HEAD and there may be some garbage in between and so the GPU promptly hangs upon resume. Testcase: igt/gem_exec_suspend/basic-S4 Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=96526 Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/20160921135108.29574-3-chris@chris-wilson.co.uk *** This bug has been marked as a duplicate of bug 96526 ***
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