Cannot start Babble on certain devices

[joneskm]

Starting Babble fails with the message:

Cannot initialize engine: Cannot acquire directory lock on "/data/user/0/io.mosaicnetworks.sample/files/babble/io.mosaicnetworks.sample_9tJjG8g4A0Bq_ccc_/badger_db". Another process is using this Badger database.: permission denied

Issue seems to occur on devices running Android 6 only. Error was reproduced on Samsung A3 running Android 6.0.1 and Samsung Galaxy s5 running 6.0.1

This project seems to have the same issue. They observe:

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

[jonknight73]

I have experienced the same issue on an Amazon Fire Tablet with a nominal API 22, Android 5.1.1.

02-18 10:11:04.390 28520-28520/io.mosaicnetworks.sample W/networks.sample: type=1400 audit(0.0:725): avc: denied { lock } for path="/data/data/io.mosaicnetworks.sample/files/babble/io.mosaicnetworks.sample_JxSG4f2ohO04_vfc_/badger_db" dev="mmcblk0p13" ino=145743 scontext=u:r:untrusted_app:s0 tcontext=u:object_r:app_data_file:s0 tclass=dir permissive=0

[jonknight73]

The exact issue is this one:

dgraph-io/badger#988

Which mentions a pull request with this commit:
https://github.com/ronaksoft/badger/commit/3a62d2f3c69a0691b7940fca3269fb433844c309

[joneskm]

This has been fixed in the Babble dependency by this pull request.