[SSHD-833] Netty: ByteBuf LEAK message

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.0.0
• Fix Version/s: 2.2.0
• Assignee: Unassigned
• Reporter: jpalacios
• Created: 11/Jul/18 01:14
• Updated: 23/Jul/21 08:43
• Resolved: 29/Jan/19 06:05

Description

We recently switched from the MinaServiceFactoryFactory to the NettyIoServiceFactoryFactory. Now whenever the application starts we see the following message:

ERROR [nioEventLoopGroup-2-2]  io.netty.util.ResourceLeakDetector LEAK: ByteBuf.release() was not called before it's garbage-collected. See http://netty.io/wiki/reference-counted-objects.html for more information.
Recent access records:
Created at:
        io.netty.buffer.PooledByteBufAllocator.newDirectBuffer(PooledByteBufAllocator.java:331)
        io.netty.buffer.AbstractByteBufAllocator.directBuffer(AbstractByteBufAllocator.java:185)
        io.netty.buffer.AbstractByteBufAllocator.directBuffer(AbstractByteBufAllocator.java:176)
        io.netty.buffer.AbstractByteBufAllocator.ioBuffer(AbstractByteBufAllocator.java:137)
        io.netty.channel.DefaultMaxMessagesRecvByteBufAllocator$MaxMessageHandle.allocate(DefaultMaxMessagesRecvByteBufAllocator.java:114)
        io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:147)
        io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:647)
        io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:582)
        io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:499)
        io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:461)
        io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:884)
        io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
        java.lang.Thread.run(Thread.java:748)

It will happen a certain number of times (first time it was 5, then it was 20) but then it won't happen any more.

Issue Links

• is duplicated by: SSHD-1200 ERR - LEAK: ByteBuf.release() was not called before it's garbage-collected.