Using Ktor on client for Kotlin Multiplatform project and ge

Question

Using Ktor on client for Kotlin Multiplatform project and getting exception with 1 4 set of libraries when running on iOS with `native mt` kotlinx coroutines and also updated to `CIO` engine as it seems is now required to use this Following is set of dependencies I m using also updated in following branch <https github com joreilly BikeShare tree 1 4> exception in thread ``` const val kotlin = 1 4 0 const val kotlinxCoroutines = 1 3 9 native mt const val ktor = 1 4 0 const val kotlinxSerialization = 1 0 0 RC ```

John O&apos;Reilly · Answer

```HttpClient REQUEST HttpClient METHOD HttpMethod value=GET HttpClient COMMON HEADERS HttpClient gt Accept application json HttpClient gt Accept Charset UTF 8 HttpClient CONTENT HEADERS HttpClient BODY Content Type null HttpClient BODY START HttpClient HttpClient BODY END HttpClient RESPONSE 200 OK HttpClient METHOD HttpMethod value=GET HttpClient FROM HttpClient COMMON HEADERS HttpClient gt Access Control Allow Origin HttpClient gt Content Length 5198 HttpClient gt Content Type application json HttpClient gt Date Tue 18 Aug 2020 20 50 16 GMT HttpClient gt Server nginx 1 15 9 Ubuntu HttpClient gt Vary Accept Encoding HttpClient gt Via kong 1 2 1 HttpClient gt X Kong Proxy Latency 1 HttpClient gt X Kong Upstream Latency 58 HttpClient gt X RateLimit Limit minute 180 HttpClient gt X RateLimit Remaining minute 179 HttpClient BODY Content Type application json HttpClient BODY START Uncaught Kotlin exception kotlinx coroutines CoroutinesInternalError Fatal exception in coroutines machinery for DispatchedContinuation MainDispatcher Continuation $split$lambda 0$ lt anonymous gt 3COROUTINE$2 Please read KDoc to handleFatalException method and report this incident to maintainers at 0 BikeShare 0x000000010497915c kfun kotlin Error lt init gt kotlin String kotlin Throwable + 124 at 1 BikeShare 0x0000000104af113c kfun kotlinx coroutines CoroutinesInternalError lt init gt kotlin String kotlin Throwable + 124 at 2 BikeShare 0x0000000104b3f3e9 kfun kotlinx coroutines DispatchedTask handleFatalException kotlin Throwable kotlin Throwable + 953 at 3 BikeShare 0x0000000104b3efc7 kfun kotlinx coroutines DispatchedTask run + 3543 at 4 BikeShare 0x0000000104b76278 kfun kotlinx coroutines DarwinMainDispatcher dispatch$lambda 0 internal + 88 at 5 BikeShare 0x0000000104b7664e kfun kotlinx coroutines DarwinMainDispatcher $dispatch$lambda 0$FUNCTION REFERENCE$41 invoke internal + 62 at 6 BikeShare 0x0000000104b766ae kfun kotlinx coroutines DarwinMainDispatcher $dispatch$lambda 0$FUNCTION REFERENCE$41 $ lt bridge UNN gt invoke internal + 62 at 7 BikeShare 0x0000000104b77767 6f72672e6a6574627261696e732e6b6f746c696e783a6b6f746c696e782d636f726f7574696e65732d636f7265 knbridge8 + 183 at 8 libdispatch dylib 0x000000010584cf11 dispatch call block and release + 12 at 9 libdispatch dylib 0x000000010584de8e dispatch client callout + 8 at 10 libdispatch dylib 0x000000010585bd97 dispatch main queue callback 4CF + 1149 at 11 CoreFoundation 0x00007fff23da1869 CFRUNLOOP IS SERVICING THE MAIN DISPATCH QUEUE + 9 at 12 CoreFoundation 0x00007fff23d9c3b9 CFRunLoopRun + 2041 at 13 CoreFoundation 0x00007fff23d9b8a4 CFRunLoopRunSpecific + 404 at 14 GraphicsServices 0x00007fff38c39bbe GSEventRunModal + 139 at 15 UIKitCore 0x00007fff49325968 UIApplicationMain + 1605 at 16 BikeShare 0x00000001048e371b main + 75 Users joreilly dev github BikeShare ios BikeShare BikeShare AppDelegate swift 13 7 at 17 libdyld dylib 0x00007fff520ce1fd start + 1 at 18 0x0000000000000001 0x0 + 1 Caused by kotlinx coroutines CompletionHandlerException Exception in completion handler ChildCompletion ChildHandle DeferredCoroutine Cancelled fa55c8 kotlin Unit for DeferredCoroutine Cancelled fa55c8 at 0 BikeShare 0x000000010497931c kfun kotlin Exception lt init gt kotlin String kotlin Throwable + 124 at 1 BikeShare 0x000000010497956c kfun kotlin RuntimeException lt init gt kotlin String kotlin Throwable + 124 at 2 BikeShare 0x0000000104af109c kfun kotlinx coroutines CompletionHandlerException lt init gt kotlin String kotlin Throwable + 124 at 3 BikeShare 0x0000000104af6e06 kfun kotlinx coroutines JobSupport notifyCompletion internal + 1606 at 4 BikeShare 0x0000000104af5a38 kfun kotlinx coroutines JobSupport completeStateFinalization internal + 1464 at 5 BikeShare 0x0000000104af3bc9 kfun kotlinx coroutines JobSupport finalizeFinishingState internal + 1705 at 6 BikeShare 0x0000000104b00ad4 kfun kotlinx coroutines JobSupport tryMakeCompletingSlowPath internal + 2036 at 7 BikeShare 0x0000000104b001b0 kfun kotlinx coroutines JobSupport tryMakeCompleting internal + 736 at 8 BikeShare 0x0000000104affbd2 kfun kotlinx coroutines JobSupport makeCompletingOnce kotlin Any kotlin Any + 642 at 9 BikeShare 0x0000000104ad42e6 kfun kotlinx coroutines AbstractCoroutine resumeWith kotlin Result lt 1 0 gt + 310 at 10 BikeShare 0x00000001049a214a kfun kotlin coroutines native internal BaseContinuationImpl resumeWith kotlin Result lt kotlin Any gt + 1450 at 11 BikeShare 0x0000000104b3eaa8 kfun kotlinx coroutines DispatchedTask run + 2232 at 12 BikeShare 0x0000000104b76278 kfun kotlinx coroutines DarwinMainDispatcher dispatch$lambda 0 internal + 88 and 14 more common stack frames skipped Caused by kotlin native concurrent InvalidMutabilityException mutation attempt of frozen kotlinx coroutines AwaitAll AwaitAllNode 224ce68 at 0 BikeShare 0x000000010498052d kfun kotlin Throwable lt init gt kotlin String + 93 at 1 BikeShare 0x000000010497926b kfun kotlin Exception lt init gt kotlin String + 91 at 2 BikeShare 0x00000001049794bb kfun kotlin RuntimeException lt init gt kotlin String + 91 at 3 BikeShare 0x00000001049af10b kfun kotlin native concurrent InvalidMutabilityException lt init gt kotlin String + 91 at 4 BikeShare 0x00000001049b09c2 ThrowInvalidMutabilityException + 690 at 5 BikeShare 0x0000000104aaa43c MutationCheck + 108 at 6 BikeShare 0x0000000104ad6936 kfun kotlinx coroutines AwaitAll AwaitAllNode lt set handle gt internal + 102 at 7 BikeShare 0x0000000104ad5b08 kfun kotlinx coroutines AwaitAll await internal + 1240 at 8 BikeShare 0x0000000104ad5071 kfun kotlinx coroutines $awaitAllCOROUTINE$1 invokeSuspend kotlin Result lt kotlin Any gt kotlin Any + 1425 at 9 BikeShare 0x0000000104ad5344 kfun kotlinx coroutines awaitAll kotlin collections Collection lt kotlinx coroutines Deferred lt 0 0 gt gt 0 lt kotlin Any gt kotlin collections List lt 0 0 gt + 244 at 10 BikeShare 0x0000000104c5f3b6 kfun io ktor util $split$lambda 0COROUTINE$3 invokeSuspend internal + 2358 at 11 BikeShare 0x00000001049a1e96 kfun kotlin coroutines native internal BaseContinuationImpl resumeWith kotlin Result lt kotlin Any gt + 758 at 12 BikeShare 0x0000000104b3ece2 kfun kotlinx coroutines DispatchedTask run + 2802 at 13 BikeShare 0x0000000104b76278 kfun kotlinx coroutines DarwinMainDispatcher dispatch$lambda 0 internal + 88 and 14 more common stack frames skipped lldb ```

e5l · Answer

< Vsevolod Tolstopyatov JB >

John O&apos;Reilly · Answer

Is there any examples of Ktor 1 4 working with `native mt` kotlinx coroutines on iOS or macOS have tried a few different things but still getting crashes

John O&apos;Reilly · Answer

one other thing I noticed is that Ktor 1 4 seems to have dependency on `1 3 8 native mt 1 4 0 rc1 3 8 native mt 1 4 0 rc` which is then mapped to `1 3 9 native mt` maybe clutching at straws but just in case that s an issue ```+ io ktor ktor client core 1 4 0 | io ktor ktor client core jvm 1 4 0 | + org jetbrains kotlin kotlin stdlib 1 4 0 | + org slf4j slf4j api 1 7 30 | + org jetbrains kotlin kotlin stdlib common 1 4 0 | + org jetbrains kotlinx kotlinx coroutines core 1 3 8 native mt 1 4 0 rc gt 1 3 9 native mt ```

tylerwilson · Answer

I also had a crash on iOS when using coroutines 1 3 9 When I switched to 1 3 8 native mt 1 4 0 rc everything started working fine I did not switch to CIO leaving it to the default engine NSURLSession on iOS I am pretty sure That is interesting how you traced through the versions That is part of what messed me up was the naming of the version for coroutines

william · Answer

do you guys have any more info about fixing this

John O&apos;Reilly · Answer

< russhwolf> seems to have isolated this to issue with ktor logging if I disable that then seems to work fine along with use of CIO on iOS at least for me

e5l · Answer

Could you file an YT issue about that

russhwolf · Answer

Already did <https youtrack jetbrains com issue KTOR 924>

e5l · Answer

Awesome thanks

russhwolf · Answer

I was able to get the default iOS engine working by disabling logging in that sample Haven t tried CIO yet

John O&apos;Reilly · Answer

my changes using setup I mentioned are in following now <https github com joreilly BikeShare>

John O&apos;Reilly · Answer

ktor native mt now seems to be happily working on both iOS and macOS again with logging disabled