[Bug 89737] New: [HSW Regression 3.19.2]igt/drm_read/short-buffer-block fails

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89737

            Bug ID: 89737
           Summary: [HSW Regression 3.19.2]igt/drm_read/short-buffer-block
                    fails
           Product: DRI
           Version: unspecified
          Hardware: All
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: high
         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 114567
  --> https://bugs.freedesktop.org/attachment.cgi?id=114567&action=edit
dmesg

==System Environment==
--------------------------
Regression: Yes
it fails on 3.19.2, works well 3.18.0

Non-working platforms: HSW

==kernel==
--------------------------
commit 660613d1a4e94144490850b6c3d350331860fac4
Author: Greg Kroah-Hartman <gregkh at linuxfoundation.org>
Date:   Wed Mar 18 14:11:52 2015 +0100

    Linux 3.19.2

==Bug detailed description==
-----------------------------
It fails on 3.19.2, works well 3.18.0 and the latest drm-intel-nightly kernel.
igt at drm_read@short-buffer-nonblock also fails.

output:
IGT-Version: 1.10-ge7d26df (x86_64) (Linux: 3.19.2_v3.19.2+ x86_64)
Test assertion failure function test_short_buffer, file drm_read.c:148:
Failed assertion: read(fd, buffer, 4) == 0
Last errno: 11, Resource temporarily unavailable
error: -1 != 0
Subtest short-buffer-block failed.
**** DEBUG ****
Test assertion failure function test_short_buffer, file drm_read.c:148:
Failed assertion: read(fd, buffer, 4) == 0
Last errno: 11, Resource temporarily unavailable
error: -1 != 0
****  END  ****
Subtest short-buffer-block: FAIL (0.000s)

Reproduce steps:
-------------------------
1. ./drm_read --run-subtest short-buffer-block

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