Bug 99566 - [SNB] GPU HANG: ecode 6:0:0x85fffffc, in compiz [17500], reason: Hang on render ring, action: reset
Summary: [SNB] GPU HANG: ecode 6:0:0x85fffffc, in compiz [17500], reason: Hang on rend...
Alias: None
Product: Mesa
Classification: Unclassified
Component: Drivers/DRI/i965 (show other bugs)
Version: unspecified
Hardware: x86-64 (AMD64) Linux (All)
: medium normal
Assignee: Ted van den Brink
QA Contact: Intel 3D Bugs Mailing List
Depends on:
Reported: 2017-01-27 15:10 UTC by Ted van den Brink
Modified: 2017-01-30 09:54 UTC (History)
1 user (show)

See Also:
i915 platform:
i915 features:

GPU crash dump (147.32 KB, application/gzip)
2017-01-27 15:10 UTC, Ted van den Brink
dmesg (16.62 KB, application/gzip)
2017-01-27 15:11 UTC, Ted van den Brink

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Description Ted van den Brink 2017-01-27 15:10:28 UTC
Created attachment 129180 [details]
GPU crash dump

Architecture: x86_64
Kernel: 4.8.0-34-generic
Distro: Ubuntu 16.10
Machine: Samsung RC720
Using built-in display and external display over VGA

I'm not sure what triggers this, it seems to be happening when Chrome Beta is running.
Comment 1 Ted van den Brink 2017-01-27 15:11:14 UTC
Created attachment 129181 [details]
Comment 2 yann 2017-01-30 09:54:01 UTC
According to mesa engineers, mesa only emits 3DSTATE_VERTEX_ELEMENTS on-demand right before 3DPRIMITIVE.

Chris has changed SNA to emit a dummy primitive between VertexElements in  4acd4a7d3d2f41227022fa7581cfb85a0b124eae in xf86-video-intel (thanks to https://cgit.freedesktop.org/xorg/driver/xf86-video-intel/commit/?id=4acd4a7d3d2f41227022fa7581cfb85a0b124eae)

So I recommend to update to latest version of xf86-video-intel since fix should be already in and mark as REOPENED if you can reproduce (and attach fresh gpu error dump) and RESOLVED/* if you cannot reproduce.

An alternate solution is to use Glamor/modesetting, but 1st try this one.

- Kernel: 4.8.0-34-generic
- Platform: SandyBridge (PCI ID: 0x0116, PCI Revision: 0x09, PCI Subsystem: 144d:c0b2)
- Mesa: [Please confirm your version]
- xf86-video-intel: [Please confirm your version]

From this error dump, hung is happening in render ring batch with active head at 0x7a09d574, with 0x7a000003 (PIPE_CONTROL) as IPEHR.

Batch extract (around 0x7a09d574):

0x7a09d52c:      0x78090005: 3DSTATE_VERTEX_ELEMENTS
0x7a09d530:      0x02000000:    buffer 0: valid, type 0x0000, src offset 0x0000 bytes
0x7a09d534:      0x11110000:    (X, Y, Z, W), dst offset 0x00 bytes
0x7a09d538:      0x02000010:    buffer 0: valid, type 0x0000, src offset 0x0010 bytes
0x7a09d53c:      0x11110000:    (X, Y, Z, W), dst offset 0x00 bytes
0x7a09d540:      0x02000020:    buffer 0: valid, type 0x0000, src offset 0x0020 bytes
0x7a09d544:      0x11110000:    (X, Y, Z, W), dst offset 0x00 bytes
0x7a09d548:      0x7b001804: 3DPRIMITIVE: tri fan sequential
0x7a09d54c:      0x00000004:    vertex count
0x7a09d550:      0x00000000:    start vertex
0x7a09d554:      0x00000001:    instance count
0x7a09d558:      0x00000000:    start instance
0x7a09d55c:      0x00000000:    index bias
0x7a09d560:      0x7a000003: PIPE_CONTROL
0x7a09d564:      0x00100002:    no write, cs stall, stall at scoreboard,
0x7a09d568:      0x00000000:    destination address
0x7a09d56c:      0x00000000:    immediate dword low
0x7a09d570:      0x00000000:    immediate dword high
0x7a09d574:      0x7a000003: PIPE_CONTROL
0x7a09d578:      0x00004000:    qword write,
0x7a09d57c:      0x00b57004:    destination address
0x7a09d580:      0x00000000:    immediate dword low
0x7a09d584:      0x00000000:    immediate dword high
0x7a09d588:      0x780e0002: 3DSTATE_CC_STATE_POINTERS
0x7a09d58c:      0x00007c01:    blend change 1
0x7a09d590:      0x00000000:    depth stencil change 0
0x7a09d594:      0x00000000:    cc change 0

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