Created attachment 114823 [details]
dmesg

==System Environment==
--------------------------
Regression: Yes
good commit: 2015_03_09/drm-intel-next-queued/68b16487f43d3e83f8ba1cff8faca3f50a80a955
bad commit: 2015_04_02/drm-intel-next-queued/2d1070b21e004609a5bebafdb4303bb021f5477c

no-working platforms: BDW/BSW

==kernel==
--------------------------
drm-intel-nightly/a8ae893a17d719d324779cfbacd6eac28356c62f
commit a8ae893a17d719d324779cfbacd6eac28356c62f
Author: Daniel Vetter <daniel.vetter@ffwll.ch>
Date:   Wed Apr 1 17:38:13 2015 +0200

    drm-intel-nightly: 2015y-04m-01d-15h-37m-35s UTC integration manifest

==Bug detailed description==
-----------------------------
It crash on BDW/BSW with the latest -nightly kernel.

output:
IGT-Version: 1.10-g992f9f6 (x86_64) (Linux: 4.0.0-rc6_drm-intel-nightly_a8ae89_20150402+ x86_64)
Test assertion failure function checkit, file pm_rps.c:154:
Failed assertion: freqs[MIN] <= freqs[CUR]
error: 450 > 300
Stack trace:
  #0 [__igt_fail_assert+0xfc]
  #1 [checkit+0x8b]
  #2 [loaded_check+0x43]
  #3 [__real_main660+0x348]
  #4 [main+0x21]
  #5 [__libc_start_main+0xf5]
  #6 [_start+0x29]
  #7 [<unknown>+0x29]
Subtest reset failed.
**** DEBUG ****
gt freq (MHz):  cur=450  min=450  max=900  RP0=900  RP1=300  RPn=300
gt freq (MHz):  cur=450  min=450  max=900  RP0=900  RP1=300  RPn=300
gt freq (MHz):  cur=450  min=450  max=900  RP0=900  RP1=300  RPn=300
gt freq (MHz):  cur=450  min=450  max=900  RP0=900  RP1=300  RPn=300
gt freq (MHz):  cur=450  min=450  max=900  RP0=900  RP1=300  RPn=300
gt freq (MHz):  cur=450  min=450  max=900  RP0=900  RP1=300  RPn=300
gt freq (MHz):  cur=450  min=450  max=900  RP0=900  RP1=300  RPn=300
gt freq (MHz):  cur=450  min=450  max=900  RP0=900  RP1=300  RPn=300
gt freq (MHz):  cur=450  min=450  max=900  RP0=900  RP1=300  RPn=300
gt freq (MHz):  cur=450  min=450  max=900  RP0=900  RP1=300  RPn=300
gt freq (MHz):  cur=450  min=450  max=900  RP0=900  RP1=300  RPn=300
gt freq (MHz):  cur=450  min=450  max=900  RP0=900  RP1=300  RPn=300
gt freq (MHz):  cur=450  min=450  max=900  RP0=900  RP1=300  RPn=300
gt freq (MHz):  cur=450  min=450  max=900  RP0=900  RP1=300  RPn=300
gt freq (MHz):  cur=450  min=450  max=900  RP0=900  RP1=300  RPn=300
gt freq (MHz):  cur=450  min=450  max=900  RP0=900  RP1=300  RPn=300
gt freq (MHz):  cur=450  min=450  max=900  RP0=900  RP1=300  RPn=300
gt freq (MHz):  cur=450  min=450  max=900  RP0=900  RP1=300  RPn=300
gt freq (MHz):  cur=450  min=450  max=900  RP0=900  RP1=300  RPn=300
gt freq (MHz):  cur=450  min=450  max=900  RP0=900  RP1=300  RPn=300
gt freq (MHz):  cur=450  min=450  max=900  RP0=900  RP1=300  RPn=300
gt freq (MHz):  cur=450  min=450  max=900  RP0=900  RP1=300  RPn=300
gt freq (MHz):  cur=450  min=450  max=900  RP0=900  RP1=300  RPn=300
gt freq (MHz):  cur=450  min=450  max=900  RP0=900  RP1=300  RPn=300
gt freq (MHz):  cur=450  min=450  max=900  RP0=900  RP1=300  RPn=300
gt freq (MHz):  cur=450  min=450  max=900  RP0=900  RP1=300  RPn=300
gt freq (MHz):  cur=450  min=450  max=900  RP0=900  RP1=300  RPn=300
gt freq (MHz):  cur=450  min=450  max=900  RP0=900  RP1=300  RPn=300
gt freq (MHz):  cur=450  min=450  max=900  RP0=900  RP1=300  RPn=300
gt freq (MHz):  cur=450  min=450  max=900  RP0=900  RP1=300  RPn=300
Waited 10000 msec to stabilize cur
Stop rings...
Ring stop cleared
Apply high load...
gt freq (MHz):  cur=300  min=450  max=900  RP0=900  RP1=300  RPn=300
Test assertion failure function checkit, file pm_rps.c:154:
Failed assertion: freqs[MIN] <= freqs[CUR]
error: 450 > 300
****  END  ****
Subtest reset: FAIL (25.739s)
Test assertion failure function load_helper_stop, file pm_rps.c:290:
Failed assertion: igt_wait_helper(&lh.igt_proc) == 0
Last errno: 10, No child processes
Stack trace:
  #0 [__igt_fail_assert+0xfc]
  #1 [load_helper_stop+0x53]
  #2 [pm_rps_exit_handler+0xfd]
  #3 [igt_atexit_handler+0x49]
  #4 [__libc_secure_getenv+0xf9]
  #5 [exit+0x15]
  #6 [igt_exit+0xde]
  #7 [main+0x26]
  #8 [__libc_start_main+0xf5]
  #9 [_start+0x29]
  #10 [<unknown>+0x29]
Test pm_rps failed.
**** DEBUG ****
Exiting with status code 99
Test assertion failure function load_helper_stop, file pm_rps.c:290:
Failed assertion: igt_wait_helper(&lh.igt_proc) == 0
Last errno: 10, No child processes
****  END  ****
pm_rps: igt_core.c:948: igt_fail: Assertion `!test_with_subtests || in_fixture' failed.
Aborted (core dumped)

==Reproduce steps==
---------------------------- 
1. ./pm_rps --run-subtest reset