Created attachment 58152 [details]
dmesg

System Environment:
--------------------------
Platform:        G33
Kernel: (drm-intel-next-queued)fa37d39e4c6622d80bd8061d600701bcea1d6870

Bug detailed description:
-------------------------
   On G33 platforms ,running gem_cs_prefetch of the Intel-gpu-tools with "make test" command will always fail,and run it seperate can pass sometimes.

   the error on the console is like this:
   gem_cs_prefetch: drmtest.c:96: gem_quiescent_gpu: Assertion `ret == 0' failed.
Aborted (core dumped)

   and with gdb backtrace like this:
#0  0x00000037f7034085 in raise () from /lib64/libc.so.6
#1  0x00000037f7035a36 in abort () from /lib64/libc.so.6
#2  0x00000037f702c8c5 in __assert_fail () from /lib64/libc.so.6
#3  0x00000000004020da in gem_quiescent_gpu (fd=7) at drmtest.c:96
#4  0x0000000000402578 in drm_open_any () at drmtest.c:114
#5  0x0000000000401552 in main (argc=<value optimized out>, argv=<value optimized out>) at gem_cs_prefetch.c:96