[Bug 111449] SPIR-V shaders that cause segmentation faults in nir_from_ssa

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111449

            Bug ID: 111449
           Summary: SPIR-V shaders that cause segmentation faults in
                    nir_from_ssa
           Product: Mesa
           Version: git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Vulkan/intel
          Assignee: intel-3d-bugs at lists.freedesktop.org
          Reporter: afdx at google.com
        QA Contact: intel-3d-bugs at lists.freedesktop.org
                CC: jason at jlekstrand.net

Created attachment 145109
  --> https://bugs.freedesktop.org/attachment.cgi?id=145109&action=edit
Amber test exposing the problem

Running:

catchsegv amber write-red-in-loop-nest.amber

leads to a segmentation fault, with a backtrace that ends in nir_from_ssa,
e.g.:

src/compiler/nir/nir_from_ssa.c:835

or sometimes in ralloc.

Build: Mesa 19.2.0-devel (git-861c2b8d31) (Debug)
Device: Intel(R) HD Graphics 630 (Kaby Lake GT2)

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