withTimeout never thrown TimeoutCancellationException

[francismariano]

Hello guys,

Here is a basic test with timeout in an Android app. In this case, println never is called because TimeoutCancellationException is not thrown, in normal behavior the app should to crash, but it is not.

fun testeTimeout() {
    mainScope.launch {
        val ret = getTimeoutInt()
        println(ret)
    }
}

suspend fun getTimeoutInt() : Int {
    return withTimeout(1000) {
        delay(5000)
        10
    }
}

However, if the getTimeoutInt is enclosed with try/catch the exception is thrown normally.

fun testeTimeout() {
    mainScope.launch {
        try {
            val ret = getTimeoutInt()
            println(ret)
        } catch (e: Exception) {
            println("ret = $e)
        }
    }
}

ret = kotlinx.coroutines.TimeoutCancellationException: Timed out waiting for 1000 ms

Is it a bug that?
Kotlin : 1.4.20-RC
Coroutine: kotlinx-coroutines-android:1.4.1

Thank you

[qwwdfsad]

TimeoutCancellationException is successfully thrown from delay method (you can see it by wrapping it into try-finally or try-catch) and coroutine from testeTimeout is terminated. It's just not printed to the console

[francismariano]

I see the exception when I wrapping it with try-catch.

But I think that the application should be crashed if the TimeoutCancellationException is successfully thrown and it is not catch with try-catch.

[qwwdfsad]

I see, this is because TimeoutCancellationException is CancellationException and CancellationException can neither crash an application nor get reported.
Let me close it as a duplicate of #1374