Hi please help slightly smiling face We are a few days from

Question

Hi please help slightly smiling face We are a few days from our release and stupid me upgraded to kotlin 1 4 20 and ktor 1 4 2 very simple handler ```get test call respondTextWriter contentType = ContentType Text CSV repeat 100000 write bla ``` result ```Exception in thread eventLoopGroupProxy 3 2 kotlinx coroutines CoroutinesInternalError Fatal exception in coroutines machinery for DispatchedContinuation UnsafeBlockingTrampoline 28448af8 Continuation at io ktor utils io jvm javaio OutputAdapter$loop$1 loop Blocking kt 311 4245d158 Please read KDoc to handleFatalException method and report this incident to maintainers at kotlinx coroutines DispatchedTask handleFatalException$kotlinx coroutines core DispatchedTask kt 93 at kotlinx coroutines DispatchedTask run DispatchedTask kt 64 at io ktor utils io jvm javaio UnsafeBlockingTrampoline dispatch Blocking kt 296 at kotlinx coroutines DispatchedContinuation resumeWith DispatchedContinuation kt 184 at io ktor utils io jvm javaio BlockingAdapter$end$1 resumeWith Blocking kt 163 at kotlin coroutines jvm internal BaseContinuationImpl resumeWith ContinuationImpl kt 46 at kotlinx coroutines DispatchedTask run DispatchedTask kt 56 at io ktor utils io jvm javaio UnsafeBlockingTrampoline dispatch Blocking kt 296 at kotlinx coroutines DispatchedContinuation resumeWith DispatchedContinuation kt 184 at io ktor utils io internal CancellableReusableContinuation resumeWith CancellableReusableContinuation kt 93 at io ktor utils io ByteBufferChannel resumeWriteOp ByteBufferChannel kt 2258 at io ktor utils io ByteBufferChannel bytesRead ByteBufferChannel kt 929 at io ktor utils io ByteBufferChannel consumed ByteBufferChannel kt 1953 at io ktor server netty cio NettyResponsePipeline$processBodyFlusher$2 invokeSuspend NettyResponsePipeline kt 305 at kotlin coroutines jvm internal BaseContinuationImpl resumeWith ContinuationImpl kt 33 at kotlinx coroutines DispatchedTask run DispatchedTask kt 56 at io netty util concurrent AbstractEventExecutor safeExecute AbstractEventExecutor java 164 at io netty util concurrent SingleThreadEventExecutor runAllTasks SingleThreadEventExecutor java 472 at io netty channel nio NioEventLoop run NioEventLoop java 500 at io netty util concurrent SingleThreadEventExecutor$4 run SingleThreadEventExecutor java 989 at io netty util internal ThreadExecutorMap$2 run ThreadExecutorMap java 74 at io ktor server netty EventLoopGroupProxy$Companion$create$factory$1$1 run NettyApplicationEngine kt 215 at io netty util concurrent FastThreadLocalRunnable run FastThreadLocalRunnable java 30 at java base java lang Thread run Thread java 832 Caused by java lang ClassCastException class kotlin coroutines jvm internal CompletedContinuation cannot be cast to class kotlinx coroutines DispatchedContinuation kotlin coroutines jvm internal CompletedContinuation and kotlinx coroutines DispatchedContinuation are in unnamed module of loader app at kotlinx coroutines CoroutineDispatcher releaseInterceptedContinuation CoroutineDispatcher kt 103 at kotlin coroutines jvm internal ContinuationImpl releaseIntercepted ContinuationImpl kt 118 at kotlin coroutines jvm internal BaseContinuationImpl resumeWith ContinuationImpl kt 39 at kotlinx coroutines DispatchedTask run DispatchedTask kt 55 22 more```

bitkid · Answer

i am using the netty engine and my test suite didnt catch that error so when using TestApplicationEngine and handleRequest it works but when i start the server and hit the endpoint with curl i get that exception

bitkid · Answer

is there any way to fix that without downgrading again

bitkid · Answer

when i use repeat 100 it works

bitkid · Answer

so it seems there is some kind of threshold at work

Satyam Agarwal · Answer

Faced the same issue Issue is already reported

bitkid · Answer

ok so no solution in sight

Satyam Agarwal · Answer

I d suggest that you make a small repo and share the code reproducing the problem and paste it on the ticket so that they can investigate and come up with a solution slightly smiling face

bitkid · Answer

lol you already wrote the failing code in the ticket its super simple to reproduce

carrot · Answer

I ve made a sample and submitted <https youtrack jetbrains com issue KTOR 1369|https youtrack jetbrains com issue KTOR 1369> and linked the ticket slightly smiling face

carrot · Answer

You can fix it by downgrading just the offending dependency to 1 4 1 if you re using that For us it was ktor Jackson

bitkid · Answer

hmm i think thats a different issue