Uncaught exception inside async

[september669]

I think it may be related to #893

import kotlinx.coroutines.*
import java.net.UnknownHostException
import kotlinx.coroutines.CoroutineScope
import kotlin.coroutines.CoroutineContext
import kotlinx.coroutines.Dispatchers
import java.io.IOException

class RunContext: CoroutineScope{
    val scopeJob = Job()

    override val coroutineContext: CoroutineContext = Dispatchers.Default + scopeJob + CoroutineExceptionHandler { _, thr -> println("catch exception in handler"); thr.printStackTrace() }

    fun launchMain(
        block: suspend CoroutineScope.() -> Unit
    ): Job = launch {
        try {
            block()
        } catch (exc: Exception) {
            println("catch exception in launchMain")
            exc.printStackTrace()
        }
    }

    fun testExceptionAsync() = launchMain{
        println("testExceptionAsync()")
        asyncThrow().await()
    }

    fun asyncThrow(): Deferred<Int> = async {
        println("asyncThrow()")
        throw IOException()
    }

}

fun main(args: Array<String>) {
    runBlocking{
        println("runBlocking")
        RunContext().testExceptionAsync().join()
        println("runBlocking done")
    }
}

Print out:

runBlocking
testExceptionAsync()
asyncThrow()
catch exception in launchMain
java.io.IOException
	at RunContext$asyncThrow$1.invokeSuspend(Simplest version.kt:31)
	at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:33)
	at kotlinx.coroutines.DispatchedTask.run(Dispatched.kt:238)
	at kotlinx.coroutines.scheduling.CoroutineScheduler.runSafely(CoroutineScheduler.kt:594)
	at kotlinx.coroutines.scheduling.CoroutineScheduler.access$runSafely(CoroutineScheduler.kt:60)
	at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.run(CoroutineScheduler.kt:742)
catch exception in handler
java.io.IOException
	at RunContext$asyncThrow$1.invokeSuspend(Simplest version.kt:31)
	at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:33)
	at kotlinx.coroutines.DispatchedTask.run(Dispatched.kt:238)
	at kotlinx.coroutines.scheduling.CoroutineScheduler.runSafely(CoroutineScheduler.kt:594)
	at kotlinx.coroutines.scheduling.CoroutineScheduler.access$runSafely(CoroutineScheduler.kt:60)
	at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.run(CoroutineScheduler.kt:742)
runBlocking done

But if remove scopeJob from coroutineContext overriding:

override val coroutineContext: CoroutineContext = Dispatchers.Default + CoroutineExceptionHandler { _, thr -> println("catch exception in handler"); thr.printStackTrace() }

all works fine:

runBlocking
testExceptionAsync()
asyncThrow()
catch exception in launchMain
java.io.IOException
	at RunContext$asyncThrow$1.invokeSuspend(Simplest version.kt:31)
	at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:33)
	at kotlinx.coroutines.DispatchedTask.run(Dispatched.kt:238)
	at kotlinx.coroutines.scheduling.CoroutineScheduler.runSafely(CoroutineScheduler.kt:594)
	at kotlinx.coroutines.scheduling.CoroutineScheduler.access$runSafely(CoroutineScheduler.kt:60)
	at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.run(CoroutineScheduler.kt:742)
runBlocking done

[september669]

Works fine with SupervisorJob