[Bug 91467] SIGSEGV "get_fb: failed to add fb" / sna_block_handler

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91467

--- Comment #3 from Chris Wilson <chris at chris-wilson.co.uk> ---
errno=22 is EINVAL, so the kernel thought the handle was unsuitable for a
framebuffer.

get_fb: failed to add fb: 1920x1080 depth=24, bpp=32, pitch=7680: 22

Looks superficially fine. Y-tiling should have been filtered out before this
point, and you would have to use drm.debug=7 to find out why the kernel
rejected it.

The really odd part is that the error messages seem to be from the
sna_present_unflip() path - that is the only path that I think can trigger that
pattern of error messages - and it should be nigh impossible to fail there
given the ScreenPixmap was previously attached.

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