[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] i915 "GPU HANG", bisected to a2daa27c0c61 "swiotlb: simplify swiotlb_max_segment"
Hi, Since 5.19, I observe severe glitches (mostly horizontal black stripes, but not only) when using IGD in Xen PV dom0. After not very long time Xorg crashes, and dmesg contain messages like this: i915 0000:00:02.0: [drm] GPU HANG: ecode 7:1:01fffbfe, in Xorg [5337] i915 0000:00:02.0: [drm] Resetting rcs0 for stopped heartbeat on rcs0 i915 0000:00:02.0: [drm] Xorg[5337] context reset due to GPU hang The issue can be observed on several different hardware (at least Ivy Bridge, Tiger Lake and Kaby Lake). It doesn't always happen immediately, sometimes I need to start several VMs first. Example how it looks like: https://openqa.qubes-os.org/tests/48187#step/qui_widgets_notifications/8 More screenshots and logs are linked at https://github.com/QubesOS/qubes-issues/issues/7813 I managed to git bisect the issue and ended up with this as the first bad commit: commit a2daa27c0c6137481226aee5b3136e453c642929 Author: Christoph Hellwig <hch@xxxxxx> Date: Mon Feb 14 11:44:42 2022 +0100 swiotlb: simplify swiotlb_max_segment Remove the bogus Xen override that was usually larger than the actual size and just calculate the value on demand. Note that swiotlb_max_segment still doesn't make sense as an interface and should eventually be removed. Signed-off-by: Christoph Hellwig <hch@xxxxxx> Reviewed-by: Anshuman Khandual <anshuman.khandual@xxxxxxx> Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx> Tested-by: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx> I tried reverting just this commit on top of 6.0.x, but the context changed significantly in subsequent commits, so after trying reverting it together with 3 or 4 more commits I gave up. What may be an important detail, the system heavily uses cross-VM shared memory (gntdev) to map window contents from VMs. This is Qubes OS, and it uses Xen 4.14. -- Best Regards, Marek Marczykowski-Górecki Invisible Things Lab Attachment:
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