VKMS uses vblank simulation through hrtimer. Updates to vblank counter in DRM are performed through drm_update_vblank_count, where the elapsed time in ns divided by vblank period. VKMS vblank timestamp computation approach results in negative elapsed time, which leads to trash u64 division result.
Fixed by https://patchwork.freedesktop.org/patch/308881/?series=61703&rev=1
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