Created attachment 246491 [details]
This is regression bug failed on Broxton platform.
1st time found this issue is testing with mainline v4.9-rc5 on one platform, till v4.9-rc7 we can reproduce the same failure on second broxton platform.
Boot into kernel, run the s3 or s4 stress(script attached), system will intermittent hang up with attached call trace, which indicated to relationship with mm_release.
Created attachment 246501 [details]
S3 stress script
Created attachment 246511 [details]
s4 stress script