[Bug 111071] SPIR-V shader processing fails with message about "extra dangling SSA sources"

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111071

            Bug ID: 111071
           Summary: SPIR-V shader processing fails with message about
                    "extra dangling SSA sources"
           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 144707
  --> https://bugs.freedesktop.org/attachment.cgi?id=144707&action=edit
Amber test exposing the problem

Running the attached test using Amber (https://github.com/google/amber):

amber nested-ifs-and-return-in-for-loop.amber

should lead to the test passing.

Instead, Amber crashes and the following is emitted:

extra dangling SSA sources:
0x561df6f9fb88
0x561df6f9ff48
0x561df6f9f7c8
0x561df6fa0308
Aborted

It looks like this message comes from src/compiler/nir/nir_validate.c.

Build: Mesa 19.2.0-devel (git-243db4980c) (Debug)
Device: Intel(R) HD Graphics 630 (Kaby Lake GT2)

Interestingly, using Mesa 18.0.3, the test does not crash, but fails due to an
incorrect colour being probed from the image that is rendered.

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