```I KtorHttpClient REQUEST OBFUSCATED URL failed with excep

Question

```I KtorHttpClient REQUEST OBFUSCATED URL failed with exception kotlin native concurrent InvalidMutabilityException mutation attempt of frozen kotlinx coroutines InvokeOnCompletion 847c8 I KtorHttpClient REQUEST OBFUSCATED URL failed with exception kotlin native concurrent InvalidMutabilityException mutation attempt of frozen io ktor util pipeline SuspendFunctionGun 596c8 kotlinx coroutines CoroutinesInternalError Fatal exception in coroutines machinery for DispatchedContinuation DispatchQueue 1517388 Continuation $runAsync$lambda 1COROUTINE$200 Please read KDoc to handleFatalException method and report this incident to maintainers at 0 myLib 0x00000001060ceb13 kfun kotlin Error lt init gt kotlin String kotlin Throwable kotlin Error + 115 Users teamcity1 teamcity work 4d622a065c544371 runtime src main kotlin kotlin Exceptions kt 14 63 at 1 myLib 0x0000000106629ad3 kfun kotlinx coroutines CoroutinesInternalError lt init gt kotlin String kotlin Throwable kotlinx coroutines CoroutinesInternalError + 115 opt buildAgent work 44ec6e850d5c63f0 kotlinx coroutines core common src Exceptions common kt 28 77 at 2 myLib 0x00000001067676ca kfun kotlinx coroutines DispatchedTask handleFatalException$kotlinx coroutines core kotlin Throwable kotlin Throwable + 938 opt buildAgent work 44ec6e850d5c63f0 kotlinx coroutines core common src internal DispatchedTask kt 93 22 at 3 myLib 0x00000001067672b4 kfun kotlinx coroutines DispatchedTask run + 3156 opt buildAgent work 44ec6e850d5c63f0 kotlinx coroutines core common src internal DispatchedTask kt 64 13 at 4 myLib 0x0000000105d93f35 kfun ob fus client utils DispatchQueue dispatch$lambda 0 internal + 85 Path at my machine myLib src iosMain kotlin ob fus client utils Dispatchers kt 24 19 at 5 myLib 0x0000000105d9401b kfun io hsdp client utils DispatchQueue $dispatch$lambda 0$FUNCTION REFERENCE$492 invoke internal + 59 Path at my machine myLib src iosMain kotlin ob fus client utils Dispatchers kt 23 39 at 6 myLib 0x0000000105d9407b kfun io hsdp client utils DispatchQueue $dispatch$lambda 0$FUNCTION REFERENCE$492 $ lt bridge UNN gt invoke internal + 59 Path at my machine myLib src iosMain kotlin ob fus client utils Dispatchers kt 23 39 at 7 myLib 0x0000000105d94164 687364702d636c69656e74 knbridge14 + 180 Path at my machine myLib src iosMain kotlin ob fus client utils Dispatchers kt 23 39 at 8 libdispatch dylib 0x00000001042dfdd4 dispatch call block and release + 12 at 9 libdispatch dylib 0x00000001042e0d48 dispatch client callout + 8 at 10 libdispatch dylib 0x00000001042eede6 dispatch main queue callback 4CF + 1500 at 11 CoreFoundation 0x00007fff23bd4049 CFRUNLOOP IS SERVICING THE MAIN DISPATCH QUEUE + 9 at 12 CoreFoundation 0x00007fff23bceca9 CFRunLoopRun + 2329 at 13 CoreFoundation 0x00007fff23bce066 CFRunLoopRunSpecific + 438 at 14 GraphicsServices 0x00007fff384c0bb0 GSEventRunModal + 65 at 15 UIKitCore 0x00007fff48092d4d UIApplicationMain + 1621 at 16 HSDP Client 0x0000000103327f5b main + 75 Path at my machine myContainingApp AppDelegate swift 7 7 at 17 libdyld dylib 0x00007fff5227ec25 start + 1 Caused by kotlin native concurrent InvalidMutabilityException mutation attempt of frozen io hsdp client utils $runAsync$lambda 1COROUTINE$200 36f9c78 at 0 myLib 0x00000001060dbec7 kfun kotlin Throwable lt init gt kotlin String kotlin Throwable + 87 Users teamcity1 teamcity work 4d622a065c544371 runtime src main kotlin kotlin Throwable kt 22 37 at 1 myLib 0x00000001060cec95 kfun kotlin Exception lt init gt kotlin String kotlin Exception + 85 Users teamcity1 teamcity work 4d622a065c544371 runtime src main kotlin kotlin Exceptions kt 23 44 at 2 myLib 0x00000001060ceeb5 kfun kotlin RuntimeException lt init gt kotlin String kotlin RuntimeException + 85 Users teamcity1 teamcity work 4d622a065c544371 runtime src main kotlin kotlin Exceptions kt 34 44 at 3 myLib 0x0000000106123a45 kfun kotlin native concurrent InvalidMutabilityException lt init gt kotlin String kotlin native concurrent InvalidMutabilityException + 85 Users teamcity1 teamcity work 4d622a065c544371 runtime src main kotlin kotlin native concurrent Freezing kt 22 60 at 4 myLib 0x0000000106126bc8 ThrowInvalidMutabilityException + 680 Users teamcity1 teamcity work 4d622a065c544371 runtime src main kotlin kotlin native concurrent Internal kt 90 11 at 5 myLib 0x0000000106518ea8 MutationCheck + 104 at 6 myLib 0x00000001061093f0 kfun kotlin coroutines native internal ContinuationImpl lt set intercepted gt internal + 96 Users teamcity1 teamcity work 4d622a065c544371 runtime src main kotlin kotlin coroutines ContinuationImpl kt 98 13 at 7 myLib 0x00000001061099fc kfun kotlin coroutines native internal ContinuationImpl releaseIntercepted + 428 Users teamcity1 teamcity work 4d622a065c544371 runtime src main kotlin kotlin coroutines ContinuationImpl kt 110 9 at 8 myLib 0x0000000106108415 kfun kotlin coroutines native internal BaseContinuationImpl resumeWith kotlin Result lt kotlin Any gt + 1253 Users teamcity1 teamcity work 4d622a065c544371 runtime src main kotlin kotlin coroutines ContinuationImpl kt 36 17 at 9 myLib 0x0000000106767073 kfun kotlinx coroutines DispatchedTask run + 2579 Users teamcity1 teamcity work 4d622a065c544371 backend native build stdlib kotlin coroutines Continuation kt 44 5 at 10 myLib 0x0000000105d93f35 kfun io hsdp client utils DispatchQueue dispatch$lambda 0 internal + 85 Path at my machine myLib src iosMain kotlin ob fus client utils Dispatchers kt 24 19 at 11 myLib 0x0000000105d9401b kfun io hsdp client utils DispatchQueue $dispatch$lambda 0$FUNCTION REFERENCE$492 invoke internal + 59 Path at my machine myLib src iosMain kotlin ob fus client utils Dispatchers kt 23 39 at 12 myLib 0x0000000105d9407b kfun io hsdp client utils DispatchQueue $dispatch$lambda 0$FUNCTION REFERENCE$492 $ lt bridge UNN gt invoke internal + 59 Path at my machine myLib src iosMain kotlin ob fus client utils Dispatchers kt 23 39 at 13 myLib 0x0000000105d94164 687364702d636c69656e74 knbridge14 + 180 Path at my machine myLib src iosMain kotlin ob fus client utils Dispatchers kt 23 39 at 14 libdispatch dylib 0x00000001042dfdd4 dispatch call block and release + 12 at 15 libdispatch dylib 0x00000001042e0d48 dispatch client callout + 8 at 16 libdispatch dylib 0x00000001042eede6 dispatch main queue callback 4CF + 1500 at 17 CoreFoundation 0x00007fff23bd4049 CFRUNLOOP IS SERVICING THE MAIN DISPATCH QUEUE + 9 at 18 CoreFoundation 0x00007fff23bceca9 CFRunLoopRun + 2329 at 19 CoreFoundation 0x00007fff23bce066 CFRunLoopRunSpecific + 438 at 20 GraphicsServices 0x00007fff384c0bb0 GSEventRunModal + 65 at 21 UIKitCore 0x00007fff48092d4d UIApplicationMain + 1621 at 22 My Lib 0x0000000103327f5b main + 75 Path at my machine myContainingApp AppDelegate swift 7 7 at 23 libdyld dylib 0x00007fff5227ec25 start + 1```

e5l · Answer

Hi < Maurice Wingbermuhle> What is your version of ktor and kotlinx coroutines

Maurice Wingbermuhle · Answer

Ktor 1 3 2 Coroutines 1 3 4 and kotlin 1 3 71

e5l · Answer

Thanks It looks like you re trying to freeze the client The iOS client can t be used from different workers or stored in top level objects and variables for now

e5l · Answer

The fix will be released with native multithreaded coroutines support in ktor

Maurice Wingbermuhle · Answer

I m not doing any explicit freezing myself The issue does not seem to appear with an earlier version of Ktor is that correct

e5l · Answer

It depends on kotlin native rules of freezing and they slightly changed between releases Ktor doesn t support freezing at all

Maurice Wingbermuhle · Answer

This native multithreaded coroutines support in Ktor sounds very exciting is it lined up for the next release