[Bug 98256] drm/i915 [drm] stuck on render ring

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=98256

yann <yann.argotti at intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Assignee|intel-gfx-bugs at lists.freede |idr at freedesktop.org
                   |sktop.org                   |
            Version|XOrg git                    |unspecified
          Component|DRM/Intel                   |Drivers/DRI/i915
         QA Contact|intel-gfx-bugs at lists.freede |
                   |sktop.org                   |
            Product|DRI                         |Mesa

--- Comment #2 from yann <yann.argotti at intel.com> ---
There were workaround for SKL and improvements pushed in kernel and Mesa that
will benefit to your system, so please re-test with latest kernel & Mesa to see
if this issue is still occurring.

In parallel, assigning to Mesa product.

Kernel: 4.4.14
Platform: Skylake GT2 (pci id:0x191b)
Mesa: [Please confirm your mesa version]

>From this error dump, hung is happening in render ring batch with active head
at 0xddf64974, with 0x7b000005 (3DPRIMITIVE) as IPEHR.

Batch extract (around 0xddf64974):

0xddf64954:      0x78090005: 3DSTATE_VERTEX_ELEMENTS
0xddf64958:      0x02000000:    buffer 0: invalid, type 0x0000, src offset
0x0000 bytes
0xddf6495c:      0x22220000:    (0.0, 0.0, 0.0, 0.0), dst offset 0x00 bytes
0xddf64960:      0x02f60000:    buffer 0: invalid, type 0x00f6, src offset
0x0000 bytes
0xddf64964:      0x11230000:    (X, Y, 0.0, 1.0), dst offset 0x00 bytes
0xddf64968:      0x02f60004:    buffer 0: invalid, type 0x00f6, src offset
0x0004 bytes
0xddf6496c:      0x11230000:    (X, Y, 0.0, 1.0), dst offset 0x00 bytes
Bad length 7 in (null), expected 6-6
0xddf64970:      0x7b000005: 3DPRIMITIVE: fail sequential
0xddf64974:      0x00000000:    vertex count
0xddf64978:      0x00000003:    start vertex
0xddf6497c:      0x00000c7a:    instance count
0xddf64980:      0x00000001:    start instance
0xddf64984:      0x00000000:    index bias
0xddf64988:      0x00000000: MI_NOOP
0xddf6498c:      0x784d0000: 3D UNKNOWN: 3d_965 opcode = 0x784d

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