all porting androi 7.0

[Jone kid]

hello all
          when I port android 7.0  I  always meet  with  the  question
,it  cause  crash,log  like  this:
1-01 00:02:50.312  1042  1042 I vold    : Vold 3.0 (the awakening) firing up
01-01 00:02:50.313  1042  1042 V vold    : Detected support for: ext4 vfat



01-01 00:02:50.313  1042  1042 F vold    : system/vold/main.cpp:161]
Check failed: android::vold::sBlkidContext != nullptr
01-01 00:02:48.436  1041  1041 W Vold    : Tearing down stale mount
/storage/sdcard
01-01 00:02:48.480  1041  1041 W Vold    : Tearing down stale mount /mnt/obb
01-01 00:02:48.520  1041  1041 W Vold    : Tearing down stale mount /mnt/asec