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https://issues.apache.org/jira/browse/CAMEL-9040?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15147051#comment-15147051
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Ralf Steppacher commented on CAMEL-9040:
----------------------------------------
[~davsclaus], thank you for your support! I will try to test, but as I have
completely abandoned {{netty4-http}} in my projects I first need to set up a
test. I hope I can do it some time this week, but cannot promise.
> netty4-http - LEAK: ByteBuf.release() was not called before it's
> garbage-collected
> ----------------------------------------------------------------------------------
>
> Key: CAMEL-9040
> URL: https://issues.apache.org/jira/browse/CAMEL-9040
> Project: Camel
> Issue Type: Bug
> Components: camel-netty4-http
> Affects Versions: 2.15.1, 2.15.2
> Environment: Karaf 3.0.3
> Reporter: Ralf Steppacher
> Priority: Critical
>
> In a reverse-proxy with multiple routes that utilize the {{netty4-http}}
> component both as the consumer and producer I am receiving the following
> error:
> {noformat}
> 2015-07-30 11:52:34,416 | ERROR | yServerTCPWorker | ResourceLeakDetector
> | 97 - io.netty.common - 4.0.27.Final | | LEAK: ByteBuf.release()
> was not called before it's garbage-collected. See
> http://netty.io/wiki/reference-counted-objects.html for more information.
> {noformat}
> Setting the Netty leak reporting to paranoid
> ({{-Dio.netty.leakDetectionLevel=paranoid}}) yields an error for almost every
> request (it probably is 1:1).
> The stacktraces come in two variants. Variant 1 is far less frequent than
> variant 2.
> Variant 1:
> {noformat}
> Recent access records: 0
> Created at:
> io.netty.buffer.CompositeByteBuf.<init>(CompositeByteBuf.java:60)
> io.netty.buffer.Unpooled.compositeBuffer(Unpooled.java:353)
> io.netty.handler.codec.http.HttpObjectAggregator.decode(HttpObjectAggregator.java:153)
> io.netty.handler.codec.http.HttpObjectAggregator.decode(HttpObjectAggregator.java:54)
> io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:89)
> io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:339)
> io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:324)
> io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:242)
> io.netty.channel.CombinedChannelDuplexHandler.channelRead(CombinedChannelDuplexHandler.java:147)
> io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:339)
> io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:324)
> io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:847)
> io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:131)
> io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:511)
> io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:468)
> io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:382)
> io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:354)
> io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:111)
> java.lang.Thread.run(Thread.java:745)
> {noformat}
> Variant 2:
> {noformat}
> Recent access records: 5
> #5:
> io.netty.buffer.AdvancedLeakAwareByteBuf.getBytes(AdvancedLeakAwareByteBuf.java:223)
> io.netty.buffer.CompositeByteBuf.getBytes(CompositeByteBuf.java:684)
> io.netty.buffer.CompositeByteBuf.getBytes(CompositeByteBuf.java:40)
> io.netty.buffer.AbstractByteBuf.readBytes(AbstractByteBuf.java:677)
> io.netty.buffer.CompositeByteBuf.readBytes(CompositeByteBuf.java:1493)
> io.netty.buffer.CompositeByteBuf.readBytes(CompositeByteBuf.java:40)
> io.netty.buffer.ByteBufInputStream.read(ByteBufInputStream.java:120)
> java.io.BufferedInputStream.fill(BufferedInputStream.java:235)
> java.io.BufferedInputStream.read1(BufferedInputStream.java:275)
> java.io.BufferedInputStream.read(BufferedInputStream.java:334)
> org.bouncycastle.util.io.TeeInputStream.read(Unknown Source)
> com.ctc.wstx.io.BaseReader.readBytes(BaseReader.java:155)
> com.ctc.wstx.io.UTF8Reader.loadMore(UTF8Reader.java:368)
> com.ctc.wstx.io.UTF8Reader.read(UTF8Reader.java:111)
> com.ctc.wstx.io.ReaderBootstrapper.initialLoad(ReaderBootstrapper.java:250)
> com.ctc.wstx.io.ReaderBootstrapper.bootstrapInput(ReaderBootstrapper.java:133)
> com.ctc.wstx.stax.WstxInputFactory.doCreateSR(WstxInputFactory.java:545)
> com.ctc.wstx.stax.WstxInputFactory.createSR(WstxInputFactory.java:605)
> com.ctc.wstx.stax.WstxInputFactory.createSR(WstxInputFactory.java:628)
> com.ctc.wstx.stax.WstxInputFactory.createXMLStreamReader(WstxInputFactory.java:331)
> ch.vivates.pep.stream.ResponseStatusFilter.filter(ResponseStatusFilter.java:41)
> ch.vivates.pep.stream.BaseStreamFilter.run(BaseStreamFilter.java:141)
> java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
> java.util.concurrent.FutureTask.run(FutureTask.java:262)
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
> java.lang.Thread.run(Thread.java:745)
> #4:
> io.netty.buffer.AdvancedLeakAwareByteBuf.release(AdvancedLeakAwareByteBuf.java:45)
> io.netty.handler.codec.http.DefaultHttpContent.release(DefaultHttpContent.java:72)
> io.netty.util.ReferenceCountUtil.release(ReferenceCountUtil.java:59)
> io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:91)
> io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:339)
> io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:324)
> io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:242)
> io.netty.channel.CombinedChannelDuplexHandler.channelRead(CombinedChannelDuplexHandler.java:147)
> io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:339)
> io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:324)
> io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:847)
> io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:131)
> io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:511)
> io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:468)
> io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:382)
> io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:354)
> io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:111)
> java.lang.Thread.run(Thread.java:745)
> #3:
> io.netty.buffer.AdvancedLeakAwareByteBuf.slice(AdvancedLeakAwareByteBuf.java:73)
> io.netty.buffer.CompositeByteBuf.addComponent0(CompositeByteBuf.java:170)
> io.netty.buffer.CompositeByteBuf.addComponent(CompositeByteBuf.java:112)
> io.netty.handler.codec.http.HttpObjectAggregator.decode(HttpObjectAggregator.java:191)
> io.netty.handler.codec.http.HttpObjectAggregator.decode(HttpObjectAggregator.java:54)
> io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:89)
> io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:339)
> io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:324)
> io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:242)
> io.netty.channel.CombinedChannelDuplexHandler.channelRead(CombinedChannelDuplexHandler.java:147)
> io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:339)
> io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:324)
> io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:847)
> io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:131)
> io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:511)
> io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:468)
> io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:382)
> io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:354)
> io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:111)
> java.lang.Thread.run(Thread.java:745)
> #2:
> io.netty.buffer.AdvancedLeakAwareByteBuf.order(AdvancedLeakAwareByteBuf.java:63)
> io.netty.buffer.CompositeByteBuf.addComponent0(CompositeByteBuf.java:170)
> io.netty.buffer.CompositeByteBuf.addComponent(CompositeByteBuf.java:112)
> io.netty.handler.codec.http.HttpObjectAggregator.decode(HttpObjectAggregator.java:191)
> io.netty.handler.codec.http.HttpObjectAggregator.decode(HttpObjectAggregator.java:54)
> io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:89)
> io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:339)
> io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:324)
> io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:242)
> io.netty.channel.CombinedChannelDuplexHandler.channelRead(CombinedChannelDuplexHandler.java:147)
> io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:339)
> io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:324)
> io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:847)
> io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:131)
> io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:511)
> io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:468)
> io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:382)
> io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:354)
> io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:111)
> java.lang.Thread.run(Thread.java:745)
> #1:
> io.netty.buffer.AdvancedLeakAwareByteBuf.retain(AdvancedLeakAwareByteBuf.java:709)
> io.netty.handler.codec.http.DefaultHttpContent.retain(DefaultHttpContent.java:60)
> io.netty.handler.codec.http.HttpObjectAggregator.decode(HttpObjectAggregator.java:190)
> io.netty.handler.codec.http.HttpObjectAggregator.decode(HttpObjectAggregator.java:54)
> io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:89)
> io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:339)
> io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:324)
> io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:242)
> io.netty.channel.CombinedChannelDuplexHandler.channelRead(CombinedChannelDuplexHandler.java:147)
> io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:339)
> io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:324)
> io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:847)
> io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:131)
> io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:511)
> io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:468)
> io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:382)
> io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:354)
> io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:111)
> java.lang.Thread.run(Thread.java:745)
> Created at:
> io.netty.buffer.UnpooledByteBufAllocator.newDirectBuffer(UnpooledByteBufAllocator.java:55)
> io.netty.buffer.AbstractByteBufAllocator.directBuffer(AbstractByteBufAllocator.java:155)
> io.netty.buffer.AbstractByteBufAllocator.directBuffer(AbstractByteBufAllocator.java:146)
> io.netty.buffer.AbstractByteBufAllocator.ioBuffer(AbstractByteBufAllocator.java:107)
> io.netty.channel.AdaptiveRecvByteBufAllocator$HandleImpl.allocate(AdaptiveRecvByteBufAllocator.java:104)
> io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:117)
> io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:511)
> io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:468)
> io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:382)
> io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:354)
> io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:111)
> java.lang.Thread.run(Thread.java:745)
> {noformat}
> Variant 2 creates the buffer in {{UnpooledByteBufAllocator}}. Which might
> mean that there is no real resource leak in that case. Rather the coding
> pattern required for objects that might be pooled is not adhered to.
> Nevertheless, running my load tests just long enough yields an OOME Direct
> buffer memory:
> {noformat}
> org.apache.camel.CamelExecutionException: Exception occurred during execution
> on the exchange: Exchange[Message: [Body is instance of
> org.apache.camel.StreamCache]]
> at
> org.apache.camel.util.ObjectHelper.wrapCamelExecutionException(ObjectHelper.java:1635)[70:org.apache.camel.camel-core:2.15.2]
> at
> org.apache.camel.impl.DefaultExchange.setException(DefaultExchange.java:308)[70:org.apache.camel.camel-core:2.15.2]
> at
> org.apache.camel.component.netty4.handlers.ClientChannelHandler.exceptionCaught(ClientChannelHandler.java:81)[143:org.apache.camel.camel-netty4:2.15.2]
> at
> io.netty.channel.AbstractChannelHandlerContext.invokeExceptionCaught(AbstractChannelHandlerContext.java:275)[138:io.netty.transport:4.0.27.Final]
> at
> io.netty.channel.AbstractChannelHandlerContext.fireExceptionCaught(AbstractChannelHandlerContext.java:253)[138:io.netty.transport:4.0.27.Final]
> at
> io.netty.channel.ChannelInboundHandlerAdapter.exceptionCaught(ChannelInboundHandlerAdapter.java:131)[138:io.netty.transport:4.0.27.Final]
> at
> io.netty.channel.AbstractChannelHandlerContext.invokeExceptionCaught(AbstractChannelHandlerContext.java:275)[138:io.netty.transport:4.0.27.Final]
> at
> io.netty.channel.AbstractChannelHandlerContext.fireExceptionCaught(AbstractChannelHandlerContext.java:253)[138:io.netty.transport:4.0.27.Final]
> at
> io.netty.channel.ChannelInboundHandlerAdapter.exceptionCaught(ChannelInboundHandlerAdapter.java:131)[138:io.netty.transport:4.0.27.Final]
> at
> io.netty.channel.CombinedChannelDuplexHandler.exceptionCaught(CombinedChannelDuplexHandler.java:137)[138:io.netty.transport:4.0.27.Final]
> at
> io.netty.channel.AbstractChannelHandlerContext.invokeExceptionCaught(AbstractChannelHandlerContext.java:275)[138:io.netty.transport:4.0.27.Final]
> at
> io.netty.channel.AbstractChannelHandlerContext.fireExceptionCaught(AbstractChannelHandlerContext.java:253)[138:io.netty.transport:4.0.27.Final]
> at
> io.netty.channel.DefaultChannelPipeline.fireExceptionCaught(DefaultChannelPipeline.java:835)[138:io.netty.transport:4.0.27.Final]
> at
> io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.handleReadException(AbstractNioByteChannel.java:87)[138:io.netty.transport:4.0.27.Final]
> at
> io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:162)[138:io.netty.transport:4.0.27.Final]
> at
> io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:511)[138:io.netty.transport:4.0.27.Final]
> at
> io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:468)[138:io.netty.transport:4.0.27.Final]
> at
> io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:382)[138:io.netty.transport:4.0.27.Final]
> at
> io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:354)[138:io.netty.transport:4.0.27.Final]
> at
> io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:111)[137:io.netty.common:4.0.27.Final]
> at java.lang.Thread.run(Thread.java:745)[:1.7.0_60]
> Caused by: java.lang.OutOfMemoryError: Direct buffer memory
> at java.nio.Bits.reserveMemory(Bits.java:658)[:1.7.0_60]
> at
> java.nio.DirectByteBuffer.<init>(DirectByteBuffer.java:123)[:1.7.0_60]
> at java.nio.ByteBuffer.allocateDirect(ByteBuffer.java:306)[:1.7.0_60]
> at
> io.netty.buffer.UnpooledUnsafeDirectByteBuf.allocateDirect(UnpooledUnsafeDirectByteBuf.java:108)[139:io.netty.buffer:4.0.27.Final]
> at
> io.netty.buffer.UnpooledUnsafeDirectByteBuf.<init>(UnpooledUnsafeDirectByteBuf.java:69)[139:io.netty.buffer:4.0.27.Final]
> at
> io.netty.buffer.UnpooledByteBufAllocator.newDirectBuffer(UnpooledByteBufAllocator.java:50)[139:io.netty.buffer:4.0.27.Final]
> at
> io.netty.buffer.AbstractByteBufAllocator.directBuffer(AbstractByteBufAllocator.java:155)[139:io.netty.buffer:4.0.27.Final]
> at
> io.netty.buffer.AbstractByteBufAllocator.directBuffer(AbstractByteBufAllocator.java:146)[139:io.netty.buffer:4.0.27.Final]
> at
> io.netty.buffer.AbstractByteBufAllocator.ioBuffer(AbstractByteBufAllocator.java:107)[139:io.netty.buffer:4.0.27.Final]
> at
> io.netty.channel.AdaptiveRecvByteBufAllocator$HandleImpl.allocate(AdaptiveRecvByteBufAllocator.java:104)[138:io.netty.transport:4.0.27.Final]
> at
> io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:117)[138:io.netty.transport:4.0.27.Final]
> ... 6 more
> {noformat}
> This is one of the routes that trigger the error:
> {code:xml}
> <route id="pep-xds_b-registry">
> <from
> uri="netty4-http:http://{{pep.host}}:{{pep.xds.b.registry.port}}/XDS3/registry?matchOnUriPrefix=true&disableStreamCache=true";
> />
> <process ref="registryInboundProcessor" />
> <to
> uri="netty4-http:http://{{xds.b.registry.host}}:{{xds.b.registry.port}}/XDS3/registry?bridgeEndpoint=true&throwExceptionOnFailure=false&chunkedMaxContentLength={{pep.xds.b.registry.max.message.size}}&disableStreamCache=false";
> />
> <!-- Unfortunately disabling the stream cache only works for requests,
> but not responses: https://issues.apache.org/jira/browse/CAMEL-7638 -->
> <process ref="registryOutboundProcessor" />
> </route>
> {code}
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