[Bug 202261] general protection fault: 0000 [#1] PREEMPT SMP Workqueue: events ttm_bo_delayed_workqueue

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=202261

--- Comment #4 from Johannes Hirte (johannes.hirte at datenkhaos.de) ---
(In reply to Michel Dänzer from comment #3)
> Looks like https://bugs.freedesktop.org/109234 =>
> https://lists.freedesktop.org/archives/dri-devel/2019-January/202909.html
> and follow-ups.

Yes, looks like it's this bug.

>From https://lists.linuxfoundation.org/pipermail/iommu/2019-January/032651.html

> Hmm, I wonder if we are not actually using swiotlb in the end,
> can you check if your dmesg contains this line or not?
>
> PCI-DMA: Using software bounce buffering for IO (SWIOTLB)

No, it isn't. I can't find anything about SWIOTLB or PCI-DMA in dmesg.

Just testing the patch. I don't have a reproducer, but it could be
suspend/resume related.

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