[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 #4 from Andreas Reis <andreas.reis at gmail.com> ---
Ah, wasn't aware of that DRI3 responsibility.

Forcing DRI2 (ie. Option "DRI" "2"), disabling compton and rebooting (since a
few weeks I lose all input devices when I merely restart X) indeed also removes
the tearing (with TearFree set true, ofc). At least it does so on
vsynctester.com.

Alas, that addr2line only yields ??:0. I'll recompile with debug and see if I
can provoke anything.

(Also, I forgot: The tearing with compton only appears when I enable its
glx-use-copysubbuffermesa, which is explicitly marked as potential vsync
breaker in its manpage.)

I probably should further mention that there are three issues I currently have
with the kernel driver:
https://bugs.freedesktop.org/show_bug.cgi?id=91452
https://bugs.freedesktop.org/show_bug.cgi?id=91429
https://bugs.freedesktop.org/show_bug.cgi?id=91428

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