[Bug 111372] Dual-monitor desktop environment crash with certain monitor positions

[bugzilla-daemon@freedesktop.org]

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https://bugs.freedesktop.org/show_bug.cgi?id=111372

            Bug ID: 111372
           Summary: Dual-monitor desktop environment crash with certain
                    monitor positions
           Product: Mesa
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Gallium/radeonsi
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: theodorettshaw@gmail.com
        QA Contact: dri-devel@lists.freedesktop.org

Created attachment 145032
  --> https://bugs.freedesktop.org/attachment.cgi?id=145032&action=edit
Monitor placement crash/working cutoff

There's an issue with certain desktop environments crashing on startup when the
monitors of a multi-display system are in certain positions. In my case, I have
two monitors, and my desktop environment crashes with the error 

cinnamon: ../src/gallium/drivers/radeonsi/si_state_viewport.c:239:
si_emit_guardband: Assertion `left <= -1 && top <= -1 && right >= 1 && bottom
>= 1' failed.

when my secondary monitor is positioned to the left of the primary monitor. An
example placement can be seen in the attached image. This is roughly the
cutoff; moving the secondary monitor, the Philips, any farther left and
restarting the DE will result in a crash. Keeping it further right and
restarting the DE results in no issues. The secondary monitor can be either
above or below the primary monitor with the same results. This error also
occurs if the secondary monitor is too far left when the DE starts on system
startup. Switching which monitor is the primary and secondary results in the
same issue, with a crash if the new secondary is too far left.

I'm using Linux Mint 19.2, Cinnamon 4.2.3, and kernel version 5.0.0-23-generic,
though I've tried several different kernel versions. I'm using an RX480. The
issue has been confirmed by others at
https://github.com/linuxmint/cinnamon/issues/8754 and a very similar and likely
linked issue at https://bugs.launchpad.net/ubuntu/+source/cinnamon/+bug/1837087
. glxinfo output can be found at https://pastebin.com/RGnAR320 and I'm happy to
provide any other information needed, though I may need some pointers on
something like recompiling Mesa in debug mode and getting a trace stack.

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