**BUG REPORT**
1. Please describe the issue you observed:
- What did you do?
run bookkeeper standalone
- What did you expect to see?
bookkeeper runs well and no surprise in the log
- What did you see instead?
```
2018-09-24 19:03:58,116 - WARN [component-shutdown-thread:Slf4JLogger@146] -
Failed to release a message: PooledUnsafeDirectByteBuf(freed)
io.netty.util.IllegalReferenceCountException: refCnt: 0, increment: 1
at
io.netty.buffer.AbstractReferenceCountedByteBuf.release0(AbstractReferenceCountedByteBuf.java:100)
at
io.netty.buffer.AbstractReferenceCountedByteBuf.release(AbstractReferenceCountedByteBuf.java:84)
at io.netty.util.ReferenceCountUtil.release(ReferenceCountUtil.java:88)
at
io.netty.util.ReferenceCountUtil.safeRelease(ReferenceCountUtil.java:113)
at
org.apache.bookkeeper.bookie.BufferedChannel.close(BufferedChannel.java:91)
at org.apache.bookkeeper.util.IOUtils.close(IOUtils.java:48)
at
org.apache.bookkeeper.bookie.EntryLogManagerForSingleEntryLog.forceClose(EntryLogManagerForSingleEntryLog.java:221)
at
org.apache.bookkeeper.bookie.EntryLogger.shutdown(EntryLogger.java:1087)
at
org.apache.bookkeeper.bookie.InterleavedLedgerStorage.shutdown(InterleavedLedgerStorage.java:186)
at
org.apache.bookkeeper.bookie.SortedLedgerStorage.shutdown(SortedLedgerStorage.java:124)
at org.apache.bookkeeper.bookie.Bookie.shutdown(Bookie.java:1099)
at org.apache.bookkeeper.bookie.Bookie.shutdown(Bookie.java:1068)
at
org.apache.bookkeeper.proto.BookieServer.shutdown(BookieServer.java:201)
at
org.apache.bookkeeper.server.service.BookieService.doClose(BookieService.java:71)
at
org.apache.bookkeeper.common.component.AbstractLifecycleComponent.close(AbstractLifecycleComponent.java:109)
at
org.apache.bookkeeper.common.component.LifecycleComponentStack.lambda$close$4(LifecycleComponentStack.java:123)
at
com.google.common.collect.ImmutableList.forEach(ImmutableList.java:408)
at
org.apache.bookkeeper.common.component.LifecycleComponentStack.close(LifecycleComponentStack.java:123)
at
org.apache.bookkeeper.common.component.ComponentStarter$ComponentShutdownHook.run(ComponentStarter.java:46)
at java.lang.Thread.run(Thread.java:748)
```
[ Full content available at: https://github.com/apache/bookkeeper/issues/1703 ]
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