Improper Synchronization (ARCH8039)

Key kotlin.async.improper-synchronization · Severity warning · Category async

Flags synchronized on a String, boxed primitive or public object - locks that other code can also lock, or that are interned and shared.

Incorrect

synchronized("lock") { }
synchronized(this) { }

Correct

private val lock = Any()
synchronized(lock) { }

Fix

Lock on a private final Any() the class owns.