java.net.SocketTimeoutException with no lines referencing my code

Ktor Version and Engine Used (client or server and name)

• io.ktor:ktor-client-core:1.2.3-rc
• io.ktor:ktor-client-core-jvm:1.2.3-rc
• io.ktor:ktor-client-okhttp:1.2.3-rc

Describe the bug See the exception below. This exception is reported by Firebase. I can not reproduce it myself although quite some users appear to get this bug. I have no idea where this happens in my code and that is why I am unable to fix it myself. It looks like some sort of timeout error.

Fatal Exception: java.net.SocketTimeoutException: timeout
       at okio.SocketAsyncTimeout.newTimeoutException + 159(SocketAsyncTimeout.java:159)
       at okio.AsyncTimeout.exit$jvm + 203(AsyncTimeout.java:203)
       at okio.AsyncTimeout$source$1.read + 163(AsyncTimeout.java:163)
       at okio.RealBufferedSource.read + 41(RealBufferedSource.java:41)
       at okhttp3.internal.http1.Http1ExchangeCodec$AbstractSource.read + 352(Http1ExchangeCodec.java:352)
       at okhttp3.internal.http1.Http1ExchangeCodec$UnknownLengthSource.read + 488(Http1ExchangeCodec.java:488)
       at okhttp3.internal.connection.Exchange$ResponseBodySource.read + 279(Exchange.java:279)
       at okio.RealBufferedSource.read + 41(RealBufferedSource.java:41)
       at okhttp3.internal.cache.CacheInterceptor$cacheWritingResponse$cacheWritingSource$1.read + 158(CacheInterceptor.java:158)
       at okio.RealBufferedSource.read + 148(RealBufferedSource.java:148)
       at io.ktor.client.engine.okhttp.OkHttpEngineKt$toChannel$1$1$1.invoke + 97(OkHttpEngineKt.java:97)
       at io.ktor.client.engine.okhttp.OkHttpEngineKt$toChannel$1$1$1.invoke(OkHttpEngineKt.java:1)
       at kotlinx.coroutines.io.ByteBufferChannel.write + 1508(ByteBufferChannel.java:1508)
       at kotlinx.coroutines.io.ByteWriteChannel$DefaultImpls.write$default + 84(ByteWriteChannel.java:84)
       at io.ktor.client.engine.okhttp.OkHttpEngineKt$toChannel$1.invokeSuspend + 96(OkHttpEngineKt.java:96)
       at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith + 33(BaseContinuationImpl.java:33)
       at kotlinx.coroutines.DispatchedTask.run + 241(DispatchedTask.java:241)
       at java.util.concurrent.ThreadPoolExecutor.runWorker + 1167(ThreadPoolExecutor.java:1167)
       at java.util.concurrent.ThreadPoolExecutor$Worker.run + 641(ThreadPoolExecutor.java:641)
       at java.lang.Thread.run + 764(Thread.java:764)
Caused by java.net.SocketTimeoutException: Read timed out
       at java.net.SocketInputStream.socketRead0(SocketInputStream.java)
       at java.net.SocketInputStream.socketRead + 119(SocketInputStream.java:119)
       at java.net.SocketInputStream.read + 176(SocketInputStream.java:176)
       at java.net.SocketInputStream.read + 144(SocketInputStream.java:144)
       at okio.InputStreamSource.read + 102(InputStreamSource.java:102)
       at okio.AsyncTimeout$source$1.read + 159(AsyncTimeout.java:159)
       at okio.RealBufferedSource.read + 41(RealBufferedSource.java:41)
       at okhttp3.internal.http1.Http1ExchangeCodec$AbstractSource.read + 352(Http1ExchangeCodec.java:352)
       at okhttp3.internal.http1.Http1ExchangeCodec$UnknownLengthSource.read + 488(Http1ExchangeCodec.java:488)
       at okhttp3.internal.connection.Exchange$ResponseBodySource.read + 279(Exchange.java:279)
       at okio.RealBufferedSource.read + 41(RealBufferedSource.java:41)
       at okhttp3.internal.cache.CacheInterceptor$cacheWritingResponse$cacheWritingSource$1.read + 158(CacheInterceptor.java:158)
       at okio.RealBufferedSource.read + 148(RealBufferedSource.java:148)
       at io.ktor.client.engine.okhttp.OkHttpEngineKt$toChannel$1$1$1.invoke + 97(OkHttpEngineKt.java:97)
       at io.ktor.client.engine.okhttp.OkHttpEngineKt$toChannel$1$1$1.invoke(OkHttpEngineKt.java:1)
       at kotlinx.coroutines.io.ByteBufferChannel.write + 1508(ByteBufferChannel.java:1508)
       at kotlinx.coroutines.io.ByteWriteChannel$DefaultImpls.write$default + 84(ByteWriteChannel.java:84)
       at io.ktor.client.engine.okhttp.OkHttpEngineKt$toChannel$1.invokeSuspend + 96(OkHttpEngineKt.java:96)
       at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith + 33(BaseContinuationImpl.java:33)
       at kotlinx.coroutines.DispatchedTask.run + 241(DispatchedTask.java:241)
       at java.util.concurrent.ThreadPoolExecutor.runWorker + 1167(ThreadPoolExecutor.java:1167)
       at java.util.concurrent.ThreadPoolExecutor$Worker.run + 641(ThreadPoolExecutor.java:641)
       at java.lang.Thread.run + 764(Thread.java:764)

To Reproduce As the stacktrace shows no lines of my code I do not know how to reproduce it. I would really appreciate some help for this exception. I am not entirely sure if this is related to Ktor, but thought this would be the best place to report it. I have Kotlin Coroutines debug mode enabled as well.

[willinwu]

We are also experiencing a similar problem (using 1.2.5):

java.net.SocketTimeoutException: 10,000 milliseconds timeout on connection http-outgoing-9 [ACTIVE]
	at org.apache.http.nio.protocol.HttpAsyncRequestExecutor.timeout(HttpAsyncRequestExecutor.java:387)
	at org.apache.http.impl.nio.client.InternalIODispatch.onTimeout(InternalIODispatch.java:92)
	at org.apache.http.impl.nio.client.InternalIODispatch.onTimeout(InternalIODispatch.java:39)
	at org.apache.http.impl.nio.reactor.AbstractIODispatch.timeout(AbstractIODispatch.java:175)
	at org.apache.http.impl.nio.reactor.BaseIOReactor.sessionTimedOut(BaseIOReactor.java:263)
	at org.apache.http.impl.nio.reactor.AbstractIOReactor.timeoutCheck(AbstractIOReactor.java:492)
	at org.apache.http.impl.nio.reactor.BaseIOReactor.validate(BaseIOReactor.java:213)
	at org.apache.http.impl.nio.reactor.AbstractIOReactor.execute(AbstractIOReactor.java:280)
	at org.apache.http.impl.nio.reactor.BaseIOReactor.execute(BaseIOReactor.java:104)
	at org.apache.http.impl.nio.reactor.AbstractMultiworkerIOReactor$Worker.run(AbstractMultiworkerIOReactor.java:591)
	at java.lang.Thread.run(Thread.java:748)`

[luqasn]

I wrote a repro case using the current prerelease version 1.3-beta1 (1.2 has the same issue). Not using SocketTimeoutException but ConnectionRefused because it is easier to cause, but behaviour should be the same: https://github.com/luqasn/ktor-httpclient-exception-repro