Bug#1029968: Acknowledgement (bttv/v4l: WARNING: CPU: 6 PID: 6164 at mm/vmalloc.c:487 __vmap_pages_range_noflush+0x3e0/0x4d0)
This is IOMMU related.
Upstream 6.1 and 5.18 *do* exhibit the bug, but only with intel_iommu=on
where as Debian seems to default it to on.
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