[Bug 100614] GPU HANG: ecode 9:0:0xef9ffffd, in chrome [1777], reason: Ring hung, action: reset

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=100614

            Bug ID: 100614
           Summary: GPU HANG: ecode 9:0:0xef9ffffd, in chrome [1777],
                    reason: Ring hung, action: reset
           Product: Mesa
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: Drivers/DRI/i915
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: ravi4tablet at gmail.com
        QA Contact: dri-devel at lists.freedesktop.org

Created attachment 130752
  --> https://bugs.freedesktop.org/attachment.cgi?id=130752&action=edit
GPU crash dump saved to /sys/class/drm/card0/error

Encountered GPU hang on Chromebook while doing Google hangouts + video(youtube)
+ few (5) tabs opened simultaneously. Reproducility is nearly 20% but requires
overnight to reproduce this issue.

GPU crash dump saved to /sys/class/drm/card0/error and logs are attached.

Kernel log says:
2017-03-26T15:51:27.709098-07:00 INFO kernel: [ 8104.736419] [drm] stuck on
render ring
2017-03-26T15:51:27.709145-07:00 INFO kernel: [ 8104.737420] [drm] GPU HANG:
ecode 9:0:0xef9ffffd, in chrome [1869], reason: Ring hung, action: reset
2017-03-26T15:51:27.709150-07:00 INFO kernel: [ 8104.737439] [drm] GPU hangs
can indicate a bug anywhere in the entire gfx stack, including userspace.


Few more details:
>From "change_card0_drm.20170406.193114.0.log" attachment, I saw it suffered GPU
command (MI_STORE_DATA_IMM) blocked in render ring and guess some batch buffers
from mesa cause this issue.
...
0x01028a90:      0x7a000004: PIPE_CONTROL: no write, no depth stall, no RC
write flush, no inst flush
0x01028a94:      0x00101001:    destination address
0x01028a98:      0x00000080:    immediate dword low
0x01028a9c:      0x00000000:    immediate dword high
0x01028aa8:      0x10400002: MI_STORE_DATA_IMM <------------blocked
0x01028aac:      0x000020c0:    dword 1
0x01028ab0:      0x00000000:    dword 2
0x01028ab4:      0x0014d95b:    dword 3
0x01028ab8:      0x01000000: MI_USER_INTERRUPT
0x01028abc:      0x00000000: MI_NOOP
0x01028ac0:      0x00000000: MI_NOOP
0x01028ac4:      0x00000000: MI_NOOP
0x01028ac8:      0x7a000004: PIPE_CONTROL: no write, no depth stall, no RC
write flush, no inst flush
0x01028acc:      0x00000000:    destination address
0x01028ad0:      0x00000000:    immediate dword low
0x01028ad4:      0x00000000:    immediate dword high

...

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