https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_3875/shard-kbl4/igt@gem_eio@in-flight-contexts.html https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_3875/shard-kbl7/igt@gem_eio@in-flight.html From pstore: <3>[ 23.739978] i915_request_retire:390 GEM_BUG_ON(!i915_request_completed(request)) <4>[ 23.740062] ------------[ cut here ]------------ <2>[ 23.740064] kernel BUG at drivers/gpu/drm/i915/i915_request.c:390! <4>[ 23.740088] invalid opcode: 0000 [#1] PREEMPT SMP PTI <0>[ 23.740095] Dumping ftrace buffer:
Same basic problem as bug 105341
(In reply to Chris Wilson from comment #1) > Same basic problem as bug 105341 Yeah, I think so to, but since the backtrace look so different I think it is better to not dup the bugs, or?
To actually reconstruct the original bug where the guc was executing contexts out of order, you have to disable trickle feeding the guc.
Oops, wrong bug.
commit ac697ae8013a7c7301174c9c3b02a92fe418b7ea Author: Chris Wilson <chris@chris-wilson.co.uk> Date: Thu Mar 15 15:10:15 2018 +0000 drm/i915: Stop engines when declaring the machine wedged If we fail to reset the GPU, we declare the machine wedged. However, the GPU may well still be running in the background with an in-flight request. So despite our efforts in cleaning up the request queue and faking the breadcrumb in the HWSP, the GPU may eventually write the in-flght seqno there breaking all of our assumptions and throwing the driver into a deep turmoil, wedging beyond wedged. To avoid this we ideally want to reset the GPU. Since that has already failed, make sure the rings have the stop bit set instead. This is part of the normal GPU reset sequence, but that is actually disabled by igt/gem_eio to force the wedged state. If we assume the worst, we must poke at the bit again before we give up. v2: Move the intel_gpu_reset() from set-wedged in the reset error path into i915_gem_set_wedged() itself. Even if the reset fails (e.g. if it is disabled by gem_eio), it still tries to make sure the engines are stopped. For i915_gem_set_wedged() callers from outside of i915_reset(), this should make sure the GPU is disabled while the driver is marked as being wedged. Testcase: igt/gem_eio Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com> Cc: Michał Winiarski <michal.winiarski@intel.com> Cc: Michal Wajdeczko <michal.wajdeczko@intel.com> Cc: Michel Thierry <michel.thierry@intel.com> Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20180315151015.22741-1-chris@chris-wilson.co.uk
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