[Bug 93672] [HSW drm] stuck on render ring + Xorg segfault

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93672

--- Comment #7 from yann <yann.argotti at intel.com> ---
(In reply to johannes.wienke from comment #4)
> I was hit by the same issue today. I will attach my debug info. Maybe it
> helps.
> 
> Maybe this is also related to
> https://bugs.freedesktop.org/show_bug.cgi?id=83704

Johannes, your issue is different from Lonni's one and the one from bug 83704.
It may be fixed with commit f55ded764ce60f87463e33bfa3a32e2c44715581 which
shipped as part of Mesa 10.6.0 in June 2015. So please update your Mesa driver.
If this is still occurring then open a new bug.

We can see from the gpu crash dump that hung is happening in render ring batch
with active head at 0x03a3818c, with 0x60020100 (CONSTANT_BUFFER) as IPEHR.

Batch extract (around 0x03a3818c):

0x03a38168:      0x78090005: 3DSTATE_VERTEX_ELEMENTS
0x03a3816c:      0x04400000:    buffer 0: valid, type 0x0040, src offset 0x0000
bytes
0x03a38170:      0x11130000:    (X, Y, Z, 1.0), dst offset 0x00 bytes
0x03a38174:      0x0485000c:    buffer 0: valid, type 0x0085, src offset 0x000c
bytes
0x03a38178:      0x11230004:    (X, Y, 0.0, 1.0), dst offset 0x10 bytes
0x03a3817c:      0x04d80014:    buffer 0: valid, type 0x00d8, src offset 0x0014
bytes
0x03a38180:      0x12230008:    (X, 0.0, 0.0, 1.0), dst offset 0x20 bytes
0x03a38184:      0x60020100: CONSTANT_BUFFER: valid
0x03a38188:      0x025b0142:    offset: 0x025b0140, length: 192 bytes
0x03a3818c:      0x7b009004: 3DPRIMITIVE: tri list random
0x03a38190:      0x00000006:    vertex count
0x03a38194:      0x00000000:    start vertex
0x03a38198:      0x00000001:    instance count
0x03a3819c:      0x00000000:    start instance
0x03a381a0:      0x00000000:    index bias

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