Seems my conclusion was a bit hasty. The background is a vendor starting 
the output with a length, followed by repository and then structured csv. 
>From that, the following (shortened) would trigger the stack trace:
"123 test"
After testing "1test" with nothing showing up in graylog, I assumed that it 
also triggered the error, and same with "123" leading me to believe that 
the starting int was the culprit. It seems though, that this is not the 
case, as those inputs does NOT trigger the stack trace, but they does not 
show up in graylog either. Hope this clarifies a bit. 

-thePretender

On Friday, February 19, 2016 at 6:06:58 PM UTC+1, Jochen Schalanda wrote:
>
> Hi,
>
> that's probably because the heuristics in the Graylog Syslog TCP input is 
> trying to use octet counting (see 
> https://tools.ietf.org/html/rfc5425#section-4.3 and 
> https://tools.ietf.org/html/rfc6587#section-3.4.1) in those syslog 
> messages to determine their length.
>
> Could you please provide some examples of those syslog messages which 
> trigger this error?
>
>
> Cheers,
> Jochen
>
> On Thursday, 18 February 2016 16:26:23 UTC+1, thePretender wrote:
>>
>> Hey,
>> Encountered a rather strange issue. If a number is the first character 
>> parsed by a syslog tcp input, the following exception is thrown. However, 
>> sending the same input to a syslog UDP input works fine.
>>
>> 2016-02-18 15:19:28,898 ERROR: 
>> org.graylog2.plugin.inputs.transports.NettyTransport - Error on Input 
>> [Syslog TCP/56c5c485c2dc44d0b90ad60c] (channel [id: 0xa83b6845, 
>> /10.0.xxx.xxx:44304 :> /10.0.xxx.xxx:5142])
>> java.lang.NumberFormatException: For input string: "1/1
>> yYb_yvcQTzqQzSDdeBAOqQ
>> default
>> {"_counter":1,"_type_str":"msg"
>> at 
>> java.lang.NumberFormatException.forInputString(NumberFormatException.java:65)
>>  
>> ~[?:1.8.0_71]
>> at java.lang.Integer.parseInt(Integer.java:580) ~[?:1.8.0_71]
>> at java.lang.Integer.parseInt(Integer.java:615) ~[?:1.8.0_71]
>> at 
>> org.graylog2.inputs.syslog.tcp.SyslogOctetCountFrameDecoder.decode(SyslogOctetCountFrameDecoder.java:44)
>>  
>> ~[graylog.jar:?]
>> at 
>> org.jboss.netty.handler.codec.frame.FrameDecoder.callDecode(FrameDecoder.java:425)
>>  
>> ~[graylog.jar:?]
>> at 
>> org.jboss.netty.handler.codec.frame.FrameDecoder.cleanup(FrameDecoder.java:482)
>>  
>> ~[graylog.jar:?]
>> at 
>> org.jboss.netty.handler.codec.frame.FrameDecoder.channelDisconnected(FrameDecoder.java:365)
>>  
>> ~[graylog.jar:?]
>> at 
>> org.jboss.netty.channel.SimpleChannelUpstreamHandler.handleUpstream(SimpleChannelUpstreamHandler.java:102)
>>  
>> ~[graylog.jar:?]
>> at 
>> org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:564)
>>  
>> [graylog.jar:?]
>> at 
>> org.jboss.netty.channel.DefaultChannelPipeline$DefaultChannelHandlerContext.sendUpstream(DefaultChannelPipeline.java:791)
>>  
>> [graylog.jar:?]
>> at 
>> org.jboss.netty.channel.SimpleChannelUpstreamHandler.channelDisconnected(SimpleChannelUpstreamHandler.java:208)
>>  
>> [graylog.jar:?]
>> at 
>> org.jboss.netty.channel.SimpleChannelUpstreamHandler.handleUpstream(SimpleChannelUpstreamHandler.java:102)
>>  
>> [graylog.jar:?]
>> at 
>> org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:564)
>>  
>> [graylog.jar:?]
>> at 
>> org.jboss.netty.channel.DefaultChannelPipeline$DefaultChannelHandlerContext.sendUpstream(DefaultChannelPipeline.java:791)
>>  
>> [graylog.jar:?]
>> at 
>> org.jboss.netty.channel.SimpleChannelHandler.channelDisconnected(SimpleChannelHandler.java:199)
>>  
>> [graylog.jar:?]
>> at 
>> org.graylog2.plugin.inputs.util.ConnectionCounter.channelDisconnected(ConnectionCounter.java:55)
>>  
>> [graylog.jar:?]
>> at 
>> org.jboss.netty.channel.SimpleChannelHandler.handleUpstream(SimpleChannelHandler.java:120)
>>  
>> [graylog.jar:?]
>> at 
>> org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:564)
>>  
>> [graylog.jar:?]
>> at 
>> org.jboss.netty.channel.DefaultChannelPipeline$DefaultChannelHandlerContext.sendUpstream(DefaultChannelPipeline.java:791)
>>  
>> [graylog.jar:?]
>> at 
>> org.jboss.netty.channel.SimpleChannelHandler.channelDisconnected(SimpleChannelHandler.java:199)
>>  
>> [graylog.jar:?]
>> at 
>> org.jboss.netty.channel.SimpleChannelHandler.handleUpstream(SimpleChannelHandler.java:120)
>>  
>> [graylog.jar:?]
>> at 
>> org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:564)
>>  
>> [graylog.jar:?]
>> at 
>> org.jboss.netty.channel.DefaultChannelPipeline$DefaultChannelHandlerContext.sendUpstream(DefaultChannelPipeline.java:791)
>>  
>> [graylog.jar:?]
>> at 
>> org.jboss.netty.channel.SimpleChannelUpstreamHandler.channelDisconnected(SimpleChannelUpstreamHandler.java:208)
>>  
>> [graylog.jar:?]
>> at 
>> org.jboss.netty.channel.SimpleChannelUpstreamHandler.handleUpstream(SimpleChannelUpstreamHandler.java:102)
>>  
>> [graylog.jar:?]
>> at 
>> org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:564)
>>  
>> [graylog.jar:?]
>> at 
>> org.jboss.netty.channel.DefaultChannelPipeline$DefaultChannelHandlerContext.sendUpstream(DefaultChannelPipeline.java:791)
>>  
>> [graylog.jar:?]
>> at 
>> org.jboss.netty.channel.SimpleChannelUpstreamHandler.channelDisconnected(SimpleChannelUpstreamHandler.java:208)
>>  
>> [graylog.jar:?]
>> at 
>> org.jboss.netty.channel.SimpleChannelUpstreamHandler.handleUpstream(SimpleChannelUpstreamHandler.java:102)
>>  
>> [graylog.jar:?]
>> at 
>> org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:564)
>>  
>> [graylog.jar:?]
>> at 
>> org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:559)
>>  
>> [graylog.jar:?]
>> at 
>> org.jboss.netty.channel.Channels.fireChannelDisconnected(Channels.java:396) 
>> [graylog.jar:?]
>> at 
>> org.jboss.netty.channel.socket.nio.AbstractNioWorker.close(AbstractNioWorker.java:360)
>>  
>> [graylog.jar:?]
>> at 
>> org.jboss.netty.channel.socket.nio.NioServerSocketPipelineSink.handleAcceptedSocket(NioServerSocketPipelineSink.java:81)
>>  
>> [graylog.jar:?]
>> at 
>> org.jboss.netty.channel.socket.nio.NioServerSocketPipelineSink.eventSunk(NioServerSocketPipelineSink.java:36)
>>  
>> [graylog.jar:?]
>> at 
>> org.jboss.netty.channel.DefaultChannelPipeline$DefaultChannelHandlerContext.sendDownstream(DefaultChannelPipeline.java:779)
>>  
>> [graylog.jar:?]
>> at 
>> org.jboss.netty.channel.SimpleChannelHandler.closeRequested(SimpleChannelHandler.java:334)
>>  
>> [graylog.jar:?]
>> at 
>> org.jboss.netty.channel.SimpleChannelHandler.handleDownstream(SimpleChannelHandler.java:260)
>>  
>> [graylog.jar:?]
>> at 
>> org.jboss.netty.channel.DefaultChannelPipeline.sendDownstream(DefaultChannelPipeline.java:591)
>>  
>> [graylog.jar:?]
>> at 
>> org.jboss.netty.channel.DefaultChannelPipeline$DefaultChannelHandlerContext.sendDownstream(DefaultChannelPipeline.java:784)
>>  
>> [graylog.jar:?]
>> at 
>> org.jboss.netty.channel.SimpleChannelHandler.closeRequested(SimpleChannelHandler.java:334)
>>  
>> [graylog.jar:?]
>> at 
>> org.jboss.netty.channel.SimpleChannelHandler.handleDownstream(SimpleChannelHandler.java:260)
>>  
>> [graylog.jar:?]
>> at 
>> org.jboss.netty.channel.DefaultChannelPipeline.sendDownstream(DefaultChannelPipeline.java:591)
>>  
>> [graylog.jar:?]
>> at 
>> org.jboss.netty.channel.DefaultChannelPipeline$DefaultChannelHandlerContext.sendDownstream(DefaultChannelPipeline.java:784)
>>  
>> [graylog.jar:?]
>> at 
>> org.jboss.netty.channel.SimpleChannelHandler.closeRequested(SimpleChannelHandler.java:334)
>>  
>> [graylog.jar:?]
>> at 
>> org.jboss.netty.channel.SimpleChannelHandler.handleDownstream(SimpleChannelHandler.java:260)
>>  
>> [graylog.jar:?]
>> at 
>> org.jboss.netty.channel.DefaultChannelPipeline.sendDownstream(DefaultChannelPipeline.java:591)
>>  
>> [graylog.jar:?]
>> at 
>> org.jboss.netty.channel.DefaultChannelPipeline.sendDownstream(DefaultChannelPipeline.java:582)
>>  
>> [graylog.jar:?]
>> at org.jboss.netty.channel.Channels.close(Channels.java:812) 
>> [graylog.jar:?]
>> at 
>> org.jboss.netty.channel.AbstractChannel.close(AbstractChannel.java:206) 
>> [graylog.jar:?]
>> at 
>> org.graylog2.plugin.inputs.transports.NettyTransport$RawMessageHandler.exceptionCaught(NettyTransport.java:347)
>>  
>> [graylog.jar:?]
>> at 
>> org.jboss.netty.channel.SimpleChannelHandler.handleUpstream(SimpleChannelHandler.java:130)
>>  
>> [graylog.jar:?]
>> at 
>> org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:564)
>>  
>> [graylog.jar:?]
>> at 
>> org.jboss.netty.channel.DefaultChannelPipeline$DefaultChannelHandlerContext.sendUpstream(DefaultChannelPipeline.java:791)
>>  
>> [graylog.jar:?]
>> at 
>> org.jboss.netty.handler.codec.frame.FrameDecoder.exceptionCaught(FrameDecoder.java:377)
>>  
>> [graylog.jar:?]
>> at 
>> org.jboss.netty.channel.SimpleChannelUpstreamHandler.handleUpstream(SimpleChannelUpstreamHandler.java:112)
>>  
>> [graylog.jar:?]
>> at 
>> org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:564)
>>  
>> [graylog.jar:?]
>> at 
>> org.jboss.netty.channel.DefaultChannelPipeline$DefaultChannelHandlerContext.sendUpstream(DefaultChannelPipeline.java:791)
>>  
>> [graylog.jar:?]
>> at 
>> org.jboss.netty.channel.SimpleChannelUpstreamHandler.exceptionCaught(SimpleChannelUpstreamHandler.java:153)
>>  
>> [graylog.jar:?]
>> at 
>> org.jboss.netty.channel.SimpleChannelUpstreamHandler.handleUpstream(SimpleChannelUpstreamHandler.java:112)
>>  
>> [graylog.jar:?]
>> at 
>> org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:564)
>>  
>> [graylog.jar:?]
>> at 
>> org.jboss.netty.channel.DefaultChannelPipeline$DefaultChannelHandlerContext.sendUpstream(DefaultChannelPipeline.java:791)
>>  
>> [graylog.jar:?]
>> at 
>> org.jboss.netty.channel.SimpleChannelHandler.exceptionCaught(SimpleChannelHandler.java:156)
>>  
>> [graylog.jar:?]
>> at 
>> org.jboss.netty.channel.SimpleChannelHandler.handleUpstream(SimpleChannelHandler.java:130)
>>  
>> [graylog.jar:?]
>> at 
>> org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:564)
>>  
>> [graylog.jar:?]
>> at 
>> org.jboss.netty.channel.DefaultChannelPipeline$DefaultChannelHandlerContext.sendUpstream(DefaultChannelPipeline.java:791)
>>  
>> [graylog.jar:?]
>> at 
>> org.jboss.netty.channel.SimpleChannelHandler.exceptionCaught(SimpleChannelHandler.java:156)
>>  
>> [graylog.jar:?]
>> at 
>> org.jboss.netty.channel.SimpleChannelHandler.handleUpstream(SimpleChannelHandler.java:130)
>>  
>> [graylog.jar:?]
>> at 
>> org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:564)
>>  
>> [graylog.jar:?]
>> at 
>> org.jboss.netty.channel.DefaultChannelPipeline$DefaultChannelHandlerContext.sendUpstream(DefaultChannelPipeline.java:791)
>>  
>> [graylog.jar:?]
>> at 
>> org.jboss.netty.channel.SimpleChannelUpstreamHandler.exceptionCaught(SimpleChannelUpstreamHandler.java:153)
>>  
>> [graylog.jar:?]
>> at 
>> org.jboss.netty.channel.SimpleChannelUpstreamHandler.handleUpstream(SimpleChannelUpstreamHandler.java:112)
>>  
>> [graylog.jar:?]
>> at 
>> org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:564)
>>  
>> [graylog.jar:?]
>> at 
>> org.jboss.netty.channel.DefaultChannelPipeline$DefaultChannelHandlerContext.sendUpstream(DefaultChannelPipeline.java:791)
>>  
>> [graylog.jar:?]
>> at 
>> org.jboss.netty.channel.SimpleChannelUpstreamHandler.exceptionCaught(SimpleChannelUpstreamHandler.java:153)
>>  
>> [graylog.jar:?]
>> at 
>> org.graylog2.plugin.inputs.transports.NettyTransport$2$1.exceptionCaught(NettyTransport.java:204)
>>  
>> [graylog.jar:?]
>> at 
>> org.jboss.netty.channel.SimpleChannelUpstreamHandler.handleUpstream(SimpleChannelUpstreamHandler.java:112)
>>  
>> [graylog.jar:?]
>> at 
>> org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:564)
>>  
>> [graylog.jar:?]
>> at 
>> org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:559)
>>  
>> [graylog.jar:?]
>> at 
>> org.jboss.netty.channel.Channels.fireExceptionCaught(Channels.java:525) 
>> [graylog.jar:?]
>> at 
>> org.jboss.netty.channel.AbstractChannelSink.exceptionCaught(AbstractChannelSink.java:48)
>>  
>> [graylog.jar:?]
>> at 
>> org.jboss.netty.channel.DefaultChannelPipeline.notifyHandlerException(DefaultChannelPipeline.java:658)
>>  
>> [graylog.jar:?]
>> at 
>> org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:566)
>>  
>> [graylog.jar:?]
>> at 
>> org.jboss.netty.channel.DefaultChannelPipeline$DefaultChannelHandlerContext.sendUpstream(DefaultChannelPipeline.java:791)
>>  
>> [graylog.jar:?]
>> at 
>> org.graylog2.inputs.syslog.tcp.SyslogTCPFramingRouterHandler.messageReceived(SyslogTCPFramingRouterHandler.java:53)
>>  
>> [graylog.jar:?]
>> at 
>> org.jboss.netty.channel.SimpleChannelUpstreamHandler.handleUpstream(SimpleChannelUpstreamHandler.java:70)
>>  
>> [graylog.jar:?]
>> at 
>> org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:564)
>>  
>> [graylog.jar:?]
>> at 
>> org.jboss.netty.channel.DefaultChannelPipeline$DefaultChannelHandlerContext.sendUpstream(DefaultChannelPipeline.java:791)
>>  
>> [graylog.jar:?]
>> at 
>> org.jboss.netty.channel.SimpleChannelHandler.messageReceived(SimpleChannelHandler.java:142)
>>  
>> [graylog.jar:?]
>> at 
>> org.jboss.netty.channel.SimpleChannelHandler.handleUpstream(SimpleChannelHandler.java:88)
>>  
>> [graylog.jar:?]
>> at 
>> org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:564)
>>  
>> [graylog.jar:?]
>> at 
>> org.jboss.netty.channel.DefaultChannelPipeline$DefaultChannelHandlerContext.sendUpstream(DefaultChannelPipeline.java:791)
>>  
>> [graylog.jar:?]
>> at 
>> org.jboss.netty.handler.traffic.AbstractTrafficShapingHandler.messageReceived(AbstractTrafficShapingHandler.java:718)
>>  
>> [graylog.jar:?]
>> at 
>> org.jboss.netty.channel.SimpleChannelHandler.handleUpstream(SimpleChannelHandler.java:88)
>>  
>> [graylog.jar:?]
>> at 
>> org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:564)
>>  
>> [graylog.jar:?]
>> at 
>> org.jboss.netty.channel.DefaultChannelPipeline$DefaultChannelHandlerContext.sendUpstream(DefaultChannelPipeline.java:791)
>>  
>> [graylog.jar:?]
>> at 
>> org.jboss.netty.channel.SimpleChannelUpstreamHandler.messageReceived(SimpleChannelUpstreamHandler.java:124)
>>  
>> [graylog.jar:?]
>> at 
>> org.graylog2.plugin.inputs.util.PacketInformationDumper.messageReceived(PacketInformationDumper.java:73)
>>  
>> [graylog.jar:?]
>> at 
>> org.jboss.netty.channel.SimpleChannelUpstreamHandler.handleUpstream(SimpleChannelUpstreamHandler.java:70)
>>  
>> [graylog.jar:?]
>> at 
>> org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:564)
>>  
>> [graylog.jar:?]
>> at 
>> org.jboss.netty.channel.DefaultChannelPipeline$DefaultChannelHandlerContext.sendUpstream(DefaultChannelPipeline.java:791)
>>  
>> [graylog.jar:?]
>> at 
>> org.jboss.netty.channel.SimpleChannelUpstreamHandler.messageReceived(SimpleChannelUpstreamHandler.java:124)
>>  
>> [graylog.jar:?]
>> at 
>> org.jboss.netty.channel.SimpleChannelUpstreamHandler.handleUpstream(SimpleChannelUpstreamHandler.java:70)
>>  
>> [graylog.jar:?]
>> at 
>> org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:564)
>>  
>> [graylog.jar:?]
>> at 
>> org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:559)
>>  
>> [graylog.jar:?]
>> at 
>> org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:268) 
>> [graylog.jar:?]
>> at 
>> org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:255) 
>> [graylog.jar:?]
>> at org.jboss.netty.channel.socket.nio.NioWorker.read(NioWorker.java:88) 
>> [graylog.jar:?]
>> at 
>> org.jboss.netty.channel.socket.nio.AbstractNioWorker.process(AbstractNioWorker.java:108)
>>  
>> [graylog.jar:?]
>> at 
>> org.jboss.netty.channel.socket.nio.AbstractNioSelector.run(AbstractNioSelector.java:337)
>>  
>> [graylog.jar:?]
>> at 
>> org.jboss.netty.channel.socket.nio.AbstractNioWorker.run(AbstractNioWorker.java:89)
>>  
>> [graylog.jar:?]
>> at org.jboss.netty.channel.socket.nio.NioWorker.run(NioWorker.java:178) 
>> [graylog.jar:?]
>> at 
>> org.jboss.netty.util.ThreadRenamingRunnable.run(ThreadRenamingRunnable.java:108)
>>  
>> [graylog.jar:?]
>> at 
>> org.jboss.netty.util.internal.DeadLockProofWorker$1.run(DeadLockProofWorker.java:42)
>>  
>> [graylog.jar:?]
>> at 
>> com.codahale.metrics.InstrumentedExecutorService$InstrumentedRunnable.run(InstrumentedExecutorService.java:176)
>>  
>> [graylog.jar:?]
>> at 
>> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
>>  
>> [?:1.8.0_71]
>> at 
>> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
>>  
>> [?:1.8.0_71]
>> at java.lang.Thread.run(Thread.java:745) [?:1.8.0_71]
>>
>>

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