[Bug 68462] [SNB]IGT/gem_evict_alignment system hang

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=68462

--- Comment #4 from lu hua <huax.lu at intel.com> ---
Following new cases also fails on PNV,ILK,IVB.HSW with -nightly and -queued
kernel and works well on -fixes kernel. 
They also cause call trace on sandybridge with -nightly and -queued kernel.
igt/gem_evict_alignment/minor-interruptible    
igt/gem_evict_alignment/minor-normal    
igt/gem_evict_everything/minor-interruptible    
igt/gem_evict_everything/minor-normal    

run ./gem_evict_alignment --run-subtest minor-interruptible
output on ivb:
Test assertion failure function copy, file gem_evict_alignment.c:117:
Failed assertion: ret == error
Subtest minor-interruptible: FAIL

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