select in JS hangs

[fvasco]

This test does not complete in Node.js 8.10.0:

import kotlinx.coroutines.experimental.*
import kotlinx.coroutines.experimental.selects.select
import kotlin.test.Test

class Test {
    @Test
    fun test() = GlobalScope.promise {
        fun asyncDelay(millis: Long) = async {
            println("Delay $millis")
            delay(millis)
            millis
        }

        val list: List<Deferred<Long>> = (0L..5L).map { asyncDelay(it) }

        val res: Long = select {
            for (item in list) {
                item.onAwait { it }
            }
        }
        println("Done $res")
    }
}

Output

    Test
Delay 0

Similar hang for 1L..5L range

package.json

{
  "name": "testjs",
  "version": "1.0.0",
  "description": "",
  "author": "",
  "license": "",
  "dependencies": {
    "kotlin": "^1.2.70",
    "kotlinx-coroutines-core": "^0.26.1",
    "source-map-support": "^0.5.6"
  },
  "devDependencies": {
    "kotlin-test": "^1.2.70",
    "mocha": "^5.2.0"
  }
}

[qwwdfsad]

I've updated (locally) kx.c node and mocha versions to 0.8.10 and 5.2.0 and copied your test, it passes successfully:

    PromiseTest
Delay 0
Delay 1
Delay 2
Delay 3
Delay 4
Delay 5
Done 0
      ✓ test

Could you please provide self-contained reproducer? Maybe you have compiler or library versions clash?

[fvasco]

Code in https://github.com/fvasco/testjs-job-hang

run

docker build -t test  .
docker run test

Some info:

$ uname -a
Linux HPeliteBook755 4.4.0-135-generic #161-Ubuntu SMP Mon Aug 27 10:45:01 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
$ cat /proc/cpuinfo |grep name
model name      : AMD PRO A12-8800B R7, 12 Compute Cores 4C+8G
model name      : AMD PRO A12-8800B R7, 12 Compute Cores 4C+8G
model name      : AMD PRO A12-8800B R7, 12 Compute Cores 4C+8G
model name      : AMD PRO A12-8800B R7, 12 Compute Cores 4C+8G

[fvasco]

Hi @qwwdfsad
I have updated the test case to 0.27.0 version, the bug is still present.

[SUPERCILEX]

I'm seeing this too

[elizarov]

It seems to be related to this bug: Kotlin/kotlinx-atomicfu#32

[fvasco]

Thank you for fix.