For anybody experiencing freezing issues with Ktor for iOS it looks like version `1.4.0` is broken....

# ktor

[Ivann Ruiz]

For anybody experiencing freezing issues with Ktor for iOS it looks like version 1.4.0 is broken. I used version 1.3.2-1.4.0-rc and it worked like a charm as suggested here. Had this issue since last week and after a few days finally found the cause haha thought I'd save others the time. For the record, my iOS app was throwing a Thread 1: signal SIGABRT on the IDE and saw this in the logs Uncaught Kotlin exception: kotlin.native.concurrent.InvalidMutabilityException: mutation attempt of frozen kotlinx.coroutines.ChildHandleNode@31dca08 .

Again it all works now after reverting the versions.

[e5l]

Hey, could you tell me what version of kotlinx.coroutines you're using?

[Ivann Ruiz]

Yeap currently using org.jetbrains.kotlinx:kotlinx-coroutines-core:1.3.9

[e5l]

Could you try using 1.3.9-native-mt?

[Ivann Ruiz]

Yeap, I did and it works fine as well, as long as ktor version is downgraded to 1.3.2-1.4.0-rc

[Ivann Ruiz]

oh but you mean using ktor 1.4.0 and coroutines 1.3.9-native-mt , no?

[Ivann Ruiz]

ok just tried this ^ and get errors: Caused by: kotlinx.coroutines.CompletionHandlerException: Exception in completion handler ChildCompletion[ChildHandle[DeferredCoroutine{Cancelled}@3376d68], kotlin.Unit]