[Bug 87733] New: [BSW]igt/gem_pwrite_pread sporadically causes *ERROR* Hangcheck timer elapsed... blitter ring idle

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=87733

            Bug ID: 87733
           Summary: [BSW]igt/gem_pwrite_pread sporadically causes *ERROR*
                    Hangcheck timer elapsed... blitter ring idle
           Product: DRI
           Version: unspecified
          Hardware: All
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: huax.lu at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 111354
  --> https://bugs.freedesktop.org/attachment.cgi?id=111354&action=edit
dmesg

==System Environment==
--------------------------
Regression: not sure

on-working platforms: BSW

==kernel==
--------------------------
drm-intel-next-queued/140fd38dc4962ae3694f81900b51c567df1b6d33

==Bug detailed description==
-----------------------------
It sporadically causes <3>[  118.756567] [drm:i915_hangcheck_elapsed [i915]]
*ERROR* Hangcheck timer elapsed... blitter ring idle. Fail rate: 1/5

output:
IGT-Version: 1.9-geb799b2 (x86_64) (Linux:
3.18.0-rc7_drm-intel-next-queued_140fd3_20141226+ x86_64)
** mmap snooped copy 16384 bytes x      1:      418.000µs, 39.2MiB/s
** mmap snooped copy 16384 bytes x      2:      181.500µs, 90.3MiB/s
** mmap snooped copy 16384 bytes x      4:      117.250µs, 139.7MiB/s
** mmap snooped copy 16384 bytes x      8:       85.000µs, 192.8MiB/s
** mmap snooped copy 16384 bytes x     16:       90.688µs, 180.7MiB/s
** mmap snooped copy 16384 bytes x     32:       84.469µs, 194.0MiB/s
** mmap snooped copy 16384 bytes x     64:       84.125µs, 194.8MiB/s
** mmap snooped copy 16384 bytes x    128:       86.250µs, 190.0MiB/s
** mmap snooped copy 16384 bytes x    256:       85.594µs, 191.4MiB/s
** mmap snooped copy 16384 bytes x    512:       83.424µs, 196.4MiB/s
** mmap snooped copy 16384 bytes x   1024:       84.175µs, 194.6MiB/s
** mmap snooped copy 16384 bytes x   2048:       85.220µs, 192.3MiB/s
** mmap snooped copy 16384 bytes x   4096:       78.558µs, 208.6MiB/s
** mmap snooped copy 16384 bytes x   8192:       89.401µs, 183.3MiB/s
** mmap snooped copy 16384 bytes x  16384:       83.158µs, 197.0MiB/s
** mmap snooped copy 16384 bytes x  32768:       81.299µs, 201.5MiB/s
** mmap snooped copy 16384 bytes x  65536:       76.108µs, 215.3MiB/s
** mmap snooped copy 16384 bytes x 131072:      100.904µs, 162.4MiB/s
Subtest snooped-pwrite-blt-cpu_mmap-performance: SUCCESS (23.644s)

==Reproduce steps==
---------------------------- 
1. ./gem_pwrite_pread --run-subtest snooped-pwrite-blt-cpu_mmap-performance

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