Quoting Patchwork (2018-03-26 17:53:44)
> Test gem_userptr_blits:
> Subgroup coherency-unsync:
> pass -> INCOMPLETE (shard-hsw)
Forgot that obj->userptr.mn may not exist.
> Subgroup dmabuf-sync:
> pass -> DMESG-WARN (shard-hsw)
But this is the tricky lockdep one, warning of the recursion from gup
into mmu_invalidate_range, i.e.
down_read(&i915_mmu_notifier->sem);
down_read(&mm_struct->mmap_sem);
gup();
down_write(&i915_mmut_notifier->sem);
That seems a genuine deadlock... So I wonder how we managed to get a
lockdep splat and not a dead machine. Maybe gup never triggers the
recursion for our set of flags? Hmm.
-Chris
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