Cannot create wallet on certain android devices.

[crux25]

Wallet creation fails on android devices that has no support for unix flock system call with the following error: loader.CreateNewWallet:: wallet.CreateDB: Cannot acquire directory lock on "/data/user/0/com.decred.dcrandroid.testnet/files/wallet/testnet3/wallet.db". Another process is using this Badger database.: permission denied. See: planetdecred/dcrandroid#352

Additional Information
Issue seems to occur on devices running Android 6 only.
Error was reproduced on Infinix hot 4 running Android 6.0 and Samsung Galaxy s5 running 6.0.1

Logs from Adb shell logcat:
08-21 10:26:26.738 2819 2819 E audit : type=1400 msg=audit(1566379586.728:1930): avc: denied { lock } for pid=14095 comm="Thread-21419" path="/data/data/com.decred.dcrandroid.testnet/files/wallet/testnet3/wallet.db" dev="mmcblk0p26" ino=360557 scontext=u:r:untrusted_app:s0:c512,c768 tcontext=u:object_r:app_data_file:s0:c512,c768 tclass=dir permissive=0

Log suggest that SELinux is blocking the flock call, and issue seems to be a known bug in android 6. See this.