[Bug 77793] New: [HSW Regression]igt/gem_reloc_vs_gpu/forked-interruptible-faulting-reloc-thrashing fails

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=77793

          Priority: medium
            Bug ID: 77793
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [HSW
                    Regression]igt/gem_reloc_vs_gpu/forked-interruptible-f
                    aulting-reloc-thrashing fails
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: jinxianx.guo at intel.com
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

Created attachment 97801
  --> https://bugs.freedesktop.org/attachment.cgi?id=97801&action=edit
dmesg

System Environment:
--------------------------
Platform: HSW
kernel:   (drm-intel-nightly)1e771b84e47085ef9b6efea1321e7cb5a8b2c065

Bug detailed description:
----------------------------
igt/gem_reloc_vs_gpu/forked-interruptible-faulting-reloc-thrashing fails on
-nightly and -next-queued(c79057922ed6c2c6df1214e6ab4414fea1b23db2)

It's a regression bug:
good commit: 04feced98a434c7046108671dc5b6f50f3b63ed7
bad commit: c27dc20db6c0bcf4078b4da65d8d20f6f0b74229
We will bisect it later

output on -next-queued kernel:
./gem_reloc_vs_gpu --run-subtest forked-interruptible-faulting-reloc-thrashing
IGT-Version: 1.6-g78e4c2b (x86_64) (Linux:
3.14.0_drm-intel-next-queued_c79057_20140423+ x86_64)
Test assertion failure function do_test, file gem_reloc_vs_gpu.c:260:
Last errno: 4, Interrupted system call
Failed assertion: test == 0xdeadbeef
mismatch in buffer 1: 0x00000000 instead of 0xdeadbeef
Test assertion failure function do_test, file gem_reloc_vs_gpu.c:260:
Last errno: 4, Interrupted system call
Failed assertion: test == 0xdeadbeef
mismatch in buffer 2: 0x00000000 instead of 0xdeadbeef
Test assertion failure function do_test, file gem_reloc_vs_gpu.c:260:
Last errno: 4, Interrupted system call
Failed assertion: test == 0xdeadbeef
mismatch in buffer 5: 0x00000000 instead of 0xdeadbeef
Test assertion failure function do_test, file gem_reloc_vs_gpu.c:260:
Last errno: 4, Interrupted system call
Failed assertion: test == 0xdeadbeef
mismatch in buffer 6: 0x00000000 instead of 0xdeadbeef
Test assertion failure function do_test, file gem_reloc_vs_gpu.c:260:
Last errno: 4, Interrupted system call
Failed assertion: test == 0xdeadbeef
mismatch in buffer 6: 0x00000000 instead of 0xdeadbeef
Test assertion failure function do_test, file gem_reloc_vs_gpu.c:260:
Last errno: 4, Interrupted system call
Failed assertion: test == 0xdeadbeef
mismatch in buffer 3: 0x00000000 instead of 0xdeadbeef
child 5 failed with exit status 99
Subtest forked-interruptible-faulting-reloc-thrashing: FAIL
gem_reloc_vs_gpu: igt_core.c:832: children_exit_handler: Assertion `ret == 0'
failed.
Aborted (core dumped)

Reproduce steps:
---------------------------- 
./gem_reloc_vs_gpu --run-subtest forked-interruptible-faulting-reloc-thrashing

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