File::unlock failed on Android during realm backup

[PanchaiNathan]

When I try to backup the chat my app is getting crash and showing like this "/tmp/realm-java/realm/realm-library/src/main/cpp/realm-core/src/realm/util/file.cpp:1101: [realm-core-13.13.0] Assertion failed: r == 0 && "File::unlock()" with (r, (*__errno())) = [-1, 38]

!!! IMPORTANT: Please report this at https://github.com/realm/realm-core/issues/new/choose"

realm version
'io.realm:android-adapters:4.0.0'
"io.realm:realm-gradle-plugin:10.16.1"

[kiburtse]

Duplicate of #6912

realm-jave 10.16.1 is still using realm-core 13.13.0.
Starting with realm-core v13.20.1 you should see this assertion any more (but probably an exception, if the problem was about something else).

You'll have to wait for realm/realm-java#7850 and next release of realm-java to check if issue is resolved.

Still though, keep in mind #6912, there are a few things to check from our side.