Comment 8 for bug 1401788

(In reply to comment #5)
> Also please update i-g-t to
>
> commit 9911f3f0cf202444f1ef2399f5961605880b7360
> Author: Chris Wilson <email address hidden>
> Date: Thu May 22 10:20:33 2014 +0100
>
> igt/gem_userptr_blits: Fix up last minute API changes
>
> When the patch was merged, the ioctl numbers had to be adjusted to leave
> no holes. Also there was a final piece of munging of the API to
> downgrade unsynced userptr for export over dma-buf.
>
> Signed-off-by: Chris Wilson <email address hidden>
>
> and run igt/gem_userptr_blits.

Run this case, system will lose network connection(BTW, this case takes more than 30 minutes). Then run reboot, system is no response.
output:
IGT-Version: 1.6-gff3c122 (x86_64) (Linux: 3.15.0-rc5_drm-intel-nightly_f5b0cc_20140522+ x86_64)
Aperture size is 4096 MiB
Total RAM is 3852 MiB
Subtest input-checking: SUCCESS
Subtest usage-restrictions: SUCCESS
Subtest invalid-mapping: SUCCESS
Subtest forbidden-operations: SUCCESS
Testing unsynchronized mappings...
Subtest create-destroy-unsync: SUCCESS
Subtest unsync-overlap: SUCCESS
Subtest unsync-unmap: SUCCESS
Subtest unsync-unmap-cycles: SUCCESS
Subtest unsync-unmap-after-close: SUCCESS
Using 2x2730 1MiB buffers
Verifying initialisation...
Cyclic blits cpu->gpu, forward...
Cyclic blits gpu->cpu, backward...
Random blits...
Subtest coherency-unsync: SUCCESS
Subtest dmabuf-unsync: SUCCESS
Subtest forked-unsync-normal: SUCCESS
Subtest forked-unsync-interruptible: SUCCESS
Subtest forked-unsync-swapping-normal: SUCCESS
Subtest forked-unsync-swapping-interruptible: SUCCESS
Subtest forked-unsync-multifd-normal: SUCCESS
Subtest forked-unsync-multifd-interruptible: SUCCESS
Subtest forked-unsync-swapping-multifd-normal: SUCCESS
Subtest forked-unsync-swapping-multifd-interruptible: SUCCESS
Subtest forked-unsync-mempressure-normal: SUCCESS
Subtest forked-unsync-mempressure-interruptible: SUCCESS
Subtest forked-unsync-swapping-mempressure-normal: SUCCESS
Subtest forked-unsync-swapping-mempressure-interruptible: SUCCESS
Subtest forked-unsync-multifd-mempressure-normal: SUCCESS
Subtest forked-unsync-multifd-mempressure-interruptible: SUCCESS
Subtest forked-unsync-swapping-multifd-mempressure-normal: SUCCESS