[Bug 96252] [SKL] GPU hang when replaying trace with SIMD32 + spilling + ?

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=96252

            Bug ID: 96252
           Summary: [SKL] GPU hang when replaying trace with SIMD32 +
                    spilling + ?
           Product: Mesa
           Version: git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/DRI/i965
          Assignee: idr at freedesktop.org
          Reporter: imirkin at alum.mit.edu
        QA Contact: intel-3d-bugs at lists.freedesktop.org

Not sure what bits are required to mess things up, but with Curro's and
Jordan's patches (jljusten's branch to enable GL 4.3), I get hangs on SKL:

[2782068.040596] [drm] stuck on render ring
[2782068.041487] [drm] GPU HANG: ecode 9:0:0x85ddfffb, in glretrace [2257],
reason: Ring hung, action: reset
[2782068.961700] drm/i915: Resetting chip after gpu hang
[2782070.036607] [drm] RC6 on
[2782075.040687] [drm] stuck on render ring
[2782075.041542] [drm] GPU HANG: ecode 9:0:0x85ddfffb, in glretrace [2257],
reason: Ring hung, action: reset
[2782075.043839] drm/i915: Resetting chip after gpu hang
[2782077.044990] [drm] RC6 on

This happens when replaying the trace from bug 94858 on my SKL GT2 (0x1912 pci
id). Ken was able to reproduce the hangs, said something about barriers going
crazy, but didn't make further progress. Note that the trace does contain some
shaders that require SIMD32.

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