Debugger retains strong reference to all coroutines

[elizarov]

With the debugger agent attached, each invocation of iterator { } leaks memory as the debugging agent keeps a strong reference to the coroutines that runs forever here.

[qwwdfsad]

One less trivial reproducer: lazy child coroutine that was cancelled before it was even started.

import kotlinx.coroutines.*
import kotlinx.coroutines.channels.*
import kotlinx.coroutines.debug.*

val name = CoroutineName("Foo")

fun CoroutineScope.myActor(): SendChannel<Unit> = actor(name, capacity = 5, start = CoroutineStart.LAZY) {
    while (true) {
        delay(1000)
        receive()
    }
}
fun main(args: Array<String>) {
    DebugProbes.install()
    runBlocking {
        val parent = Job()
        val context = CoroutineScope(Dispatchers.IO + parent)
        val channel = context.myActor()
        context.cancel()
        delay(5000)
        DebugProbes.dumpCoroutines()
    }
}