[Bug 111748] [SKL/Iris] Random asserts in SynMark Multithread test: "pipe_reference_described: Assertion `count != -1' failed"

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111748

            Bug ID: 111748
           Summary: [SKL/Iris] Random asserts in SynMark Multithread test:
                    "pipe_reference_described: Assertion `count != -1'
                    failed"
           Product: Mesa
           Version: git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: not set
          Priority: not set
         Component: Drivers/Gallium/Iris
          Assignee: intel-3d-bugs at lists.freedesktop.org
          Reporter: eero.t.tamminen at intel.com
        QA Contact: intel-3d-bugs at lists.freedesktop.org

Setup:
* HW: SKL GT2 i5-6600K
* OS: Ubuntu 18.04
* SW: Git versions of drm-tip kernel, X server, SynMark2 v7.0
* Mesa: 68820007fddbb5b79f1b2b08e66ef14092053a95 (2019-09-18 15:16:36 radv: fix
loading 64-bit GS inputs)

Test-case:
* Run multiple times:
  ./synmark2 OglMultithread

Expected outcome:
* Works fine, as with i965 driver

Actual outcome:
* Half of the runs hit following assert:
  src/gallium/auxiliary/util/u_inlines.h:87:pipe_reference_described: Assertion
`count != -1' failed.

Because of bug 111385, I don't know when this issue started.  That may also
have been affected by enabling VT-d (which allows kernel to enable GPU IOMMU).

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