[Bug 68003] New: igt/gem_pwrite segfault

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=68003

          Priority: high
            Bug ID: 68003
          Assignee: chris at chris-wilson.co.uk
           Summary: igt/gem_pwrite segfault
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: major
    Classification: Unclassified
                OS: Linux (All)
          Reporter: huax.lu at intel.com
          Hardware: All
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

Created attachment 83954
  --> https://bugs.freedesktop.org/attachment.cgi?id=83954&action=edit
dmesg

System Environment:
--------------------------
Platform:  PNV/ILK/SNB/IVB/HSW
Kernel:   drm-intel-nightly(8894ac87e4db055bbdd44647c1ce2df274400264)

Bug detailed description:
-----------------------------
It fails on all platforms: PNV/ILK/SNB/IVB/HSW.It happens on drm-intel-nightly,
drm-intel-next-queued, drm-intel-fixes kernel.
Bisect shows: 467796acc80ced3440740d267c2e2a4f246d4b8a is the first bad commit.
commit 467796acc80ced3440740d267c2e2a4f246d4b8a
Author:     Chris Wilson <chris at chris-wilson.co.uk>
AuthorDate: Sat Aug 10 15:49:33 2013 +0100
Commit:     Chris Wilson <chris at chris-wilson.co.uk>
CommitDate: Sat Aug 10 15:49:33 2013 +0100

    Expand gem_set_cacheing testing to handle the proposed DISPLAY domain

output:
Time to pwrite 16384 bytes x      1:     22.000µs, 744.7MiB/s
Time to pwrite 16384 bytes x      2:      5.000µs, 3.3GiB/s
Time to pwrite 16384 bytes x      4:      3.750µs, 4.4GiB/s
Time to pwrite 16384 bytes x      8:      3.625µs, 4.5GiB/s
Time to pwrite 16384 bytes x     16:      3.500µs, 4.7GiB/s
Time to pwrite 16384 bytes x     32:      3.844µs, 4.3GiB/s
Time to pwrite 16384 bytes x     64:      4.516µs, 3.6GiB/s
Time to pwrite 16384 bytes x    128:      3.664µs, 4.5GiB/s
Time to pwrite 16384 bytes x    256:      3.551µs, 4.6GiB/s
Time to pwrite 16384 bytes x    512:      3.482µs, 4.7GiB/s
Time to pwrite 16384 bytes x   1024:      3.450µs, 4.7GiB/s
Time to pwrite 16384 bytes x   2048:      3.433µs, 4.8GiB/s
Time to pwrite 16384 bytes x   4096:      3.433µs, 4.8GiB/s
Time to pwrite 16384 bytes x   8192:      3.433µs, 4.8GiB/s
Time to pwrite 16384 bytes x  16384:      3.431µs, 4.8GiB/s
Time to pwrite 16384 bytes x  32768:      3.424µs, 4.8GiB/s
Time to pwrite 16384 bytes x  65536:      3.427µs, 4.8GiB/s
Time to pwrite 16384 bytes x 131072:      3.430µs, 4.8GiB/s
Time to (null) pwrite 16384 bytes x      1:       4.000µs, 4.1GiB/s
Time to (null) pwrite 16384 bytes x      2:       3.500µs, 4.7GiB/s
Time to (null) pwrite 16384 bytes x      4:       3.750µs, 4.4GiB/s
Time to (null) pwrite 16384 bytes x      8:       3.500µs, 4.7GiB/s
Time to (null) pwrite 16384 bytes x     16:       3.500µs, 4.7GiB/s
Time to (null) pwrite 16384 bytes x     32:       3.469µs, 4.7GiB/s
Time to (null) pwrite 16384 bytes x     64:       4.250µs, 3.9GiB/s
Time to (null) pwrite 16384 bytes x    128:       3.742µs, 4.4GiB/s
Time to (null) pwrite 16384 bytes x    256:       3.559µs, 4.6GiB/s
Time to (null) pwrite 16384 bytes x    512:       3.498µs, 4.7GiB/s
Time to (null) pwrite 16384 bytes x   1024:       3.459µs, 4.7GiB/s
Time to (null) pwrite 16384 bytes x   2048:       3.444µs, 4.8GiB/s
Time to (null) pwrite 16384 bytes x   4096:       3.437µs, 4.8GiB/s
Time to (null) pwrite 16384 bytes x   8192:       3.419µs, 4.8GiB/s
Time to (null) pwrite 16384 bytes x  16384:       3.423µs, 4.8GiB/s
Time to (null) pwrite 16384 bytes x  32768:       3.431µs, 4.8GiB/s
Time to (null) pwrite 16384 bytes x  65536:       3.433µs, 4.8GiB/s
Time to (null) pwrite 16384 bytes x 131072:       3.429µs, 4.8GiB/s
Segmentation fault (core dumped)


Reproduce steps:
----------------------------
1. ./gem_pwrite

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