Nouveau - May 2016 - [Bug 96274] New: [NVC0] Failure when compiling compute shader: Assertion `bb->getFirst()->serial <= bb->getExit()->serial' failed

https://bugs.freedesktop.org/show_bug.cgi?id=96274

            Bug ID: 96274
           Summary: [NVC0] Failure when compiling compute shader:
                    Assertion `bb->getFirst()->serial <                
bb->getExit()->serial' failed
           Product: Mesa
           Version: git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/DRI/nouveau
          Assignee: nouveau at lists.freedesktop.org
          Reporter: imirkin at alum.mit.edu
        QA Contact: nouveau at lists.freedesktop.org

Created attachment 124171
  --> https://bugs.freedesktop.org/attachment.cgi?id=124171&action=edit
failing tgsi shader

This happens in GRID Autosport, when selecting one of the advanced graphics
options (global illumination or the one right next to it). The issue appears to
be squarely in nouveau's optimizations.

It looks like we end up deciding that the first while loop can be removed? Or
somehow lose track of those BBs? Unclear. This in turn leads to BB:11 being
completely lost.

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https://bugs.freedesktop.org/show_bug.cgi?id=96274

Ilia Mirkin <imirkin at alum.mit.edu> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |FIXED
             Status|NEW                         |RESOLVED

--- Comment #1 from Ilia Mirkin <imirkin at alum.mit.edu> ---
Fixed by

commit 092f994a034b718f6170c631655ccaba8d2aa768
Author: Ilia Mirkin <imirkin at alum.mit.edu>
Date:   Fri Aug 19 00:41:59 2016 -0400

    nv50/ir: make sure cfg iterator always hits all blocks

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