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Posted to dev@mina.apache.org by "Guillaume Nodet (Jira)" <ji...@apache.org> on 2020/09/22 08:37:00 UTC
[jira] [Resolved] (SSHD-1070) OutOfMemoryError when use port
forwarding
[ https://issues.apache.org/jira/browse/SSHD-1070?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Guillaume Nodet resolved SSHD-1070.
-----------------------------------
Fix Version/s: 2.6.0
Assignee: Guillaume Nodet
Resolution: Fixed
> OutOfMemoryError when use port forwarding
> -----------------------------------------
>
> Key: SSHD-1070
> URL: https://issues.apache.org/jira/browse/SSHD-1070
> Project: MINA SSHD
> Issue Type: Bug
> Affects Versions: 2.5.1
> Reporter: Feng Jiajie
> Assignee: Guillaume Nodet
> Priority: Major
> Fix For: 2.6.0
>
> Time Spent: 4h 50m
> Remaining Estimate: 0h
>
> Hi [~gnodet], I found this commit implemented asynchronous port forwarding:
> [https://github.com/apache/mina-sshd/commit/45f84aab59b2e11d72942cffe9d810e37ab64959#diff-33823b8546f71d77bb1d653358ecde70]
> However, when a large amount of data is returned from upstream application, it is possible to cause an OOM in SSHD.
> Step1. SSHD server:
> {code:java}
> import org.apache.sshd.common.FactoryManager;
> import org.apache.sshd.common.PropertyResolverUtils;
> import org.apache.sshd.common.util.security.SecurityUtils;
> import org.apache.sshd.server.SshServer;
> import org.apache.sshd.server.forward.AcceptAllForwardingFilter;
> import org.apache.sshd.server.keyprovider.SimpleGeneratorHostKeyProvider;
> import java.io.IOException;
> import java.nio.file.Paths;
> public class TestSshd2 {
> public static void main(String[] args) throws IOException, InterruptedException {
> SecurityUtils.setAPrioriDisabledProvider("BC", true);
> SshServer sshd = SshServer.setUpDefaultServer();
> sshd.setPort(12133);
> sshd.setKeyPairProvider(new SimpleGeneratorHostKeyProvider(Paths.get("/tmp/aa.key")));
> sshd.setPasswordAuthenticator((username, password, session) -> true);
> sshd.setForwardingFilter(AcceptAllForwardingFilter.INSTANCE);
> sshd.start();
> Thread.sleep(100000000);
> }
> }
> {code}
> Step2. start ssh client and iperf3 server:
> {code:java}
> ssh -o 'ExitOnForwardFailure yes' -p 12133 -f -x -N -T -L 0.0.0.0:15678:127.0.0.1:12345 test5@127.0.0.1
> iperf3 -s -p 12345
> {code}
> Step3. run iperf3 client:
> {code:java}
> iperf3 -c 127.0.0.1 -i 1 -t 120 -p 15678 -P 8 --reverse
> {code}
> *-R, --reverse run in reverse mode (server sends, client receives)*
> SSHD will receive a lot of data but will not be able to forward it in time.
> log when OOM:
> {code:java}
> 17:52:25.195 [sshd-SshServer[5bcea91b](port=12133)-nio2-thread-1] WARN org.apache.sshd.common.io.nio2.Nio2Session - exceptionCaught(Nio2Session[local=/127.0.0.1:33524, remote=/127.0.0.1:12345]) Exception handler threw OutOfMemoryError, closing the session: GC overhead limit exceeded17:52:25.195 [sshd-SshServer[5bcea91b](port=12133)-nio2-thread-1] WARN org.apache.sshd.common.io.nio2.Nio2Session - exceptionCaught(Nio2Session[local=/127.0.0.1:33524, remote=/127.0.0.1:12345]) Exception handler threw OutOfMemoryError, closing the session: GC overhead limit exceeded at org.apache.sshd.common.io.nio2.Nio2CompletionHandler.completed(Nio2CompletionHandler.java:37) at sun.nio.ch.Invoker.invokeUnchecked(Invoker.java:126) at sun.nio.ch.Invoker.invokeDirect(Invoker.java:157) at sun.nio.ch.UnixAsynchronousSocketChannelImpl.implWrite(UnixAsynchronousSocketChannelImpl.java:736) at sun.nio.ch.AsynchronousSocketChannelImpl.write(AsynchronousSocketChannelImpl.java:382) at sun.nio.ch.AsynchronousSocketChannelImpl.write(AsynchronousSocketChannelImpl.java:399) at org.apache.sshd.common.io.nio2.Nio2Session.doWriteCycle(Nio2Session.java:420) at org.apache.sshd.common.io.nio2.Nio2Session.startWriting(Nio2Session.java:404) at org.apache.sshd.common.io.nio2.Nio2Session.finishWrite(Nio2Session.java:495) at org.apache.sshd.common.io.nio2.Nio2Session.handleCompletedWriteCycle(Nio2Session.java:465) at org.apache.sshd.common.io.nio2.Nio2Session$2.onCompleted(Nio2Session.java:429) at org.apache.sshd.common.io.nio2.Nio2Session$2.onCompleted(Nio2Session.java:426)17:52:25.639 [sshd-SshServer[5bcea91b](port=12133)-nio2-thread-6] WARN org.apache.sshd.common.io.nio2.Nio2Session - exceptionCaught(Nio2Session[local=/127.0.0.1:33530, remote=/127.0.0.1:12345]) Exception handler threw OutOfMemoryError, closing the session: GC overhead limit exceeded at org.apache.sshd.common.io.nio2.Nio2CompletionHandler.lambda$completed$0(Nio2CompletionHandler.java:38) at java.security.AccessController.doPrivileged(Native Method) at org.apache.sshd.common.io.nio2.Nio2CompletionHandler.completed(Nio2CompletionHandler.java:37) at sun.nio.ch.Invoker.invokeUnchecked(Invoker.java:126) at sun.nio.ch.Invoker.invokeDirect(Invoker.java:157) at sun.nio.ch.UnixAsynchronousSocketChannelImpl.implWrite(UnixAsynchronousSocketChannelImpl.java:736)17:52:26.045 [sshd-SshServer[5bcea91b](port=12133)-nio2-thread-2] DEBUG org.apache.sshd.common.io.nio2.Nio2Session - exceptionCaught(Nio2Session[local=/127.0.0.1:33522, remote=/127.0.0.1:12345]) caught OutOfMemoryError[GC overhead limit exceeded] - calling handler17:52:26.045 [sshd-SshServer[5bcea91b](port=12133)-nio2-thread-2] DEBUG org.apache.sshd.server.forward.TcpipServerChannel - exceptionCaught(TcpipServerChannel[id=3, recipient=4]-ServerSessionImpl[test5@/127.0.0.1:53702]) signal close immediately=false due to OutOfMemoryError[GC overhead limit exceeded]17:52:26.045 [sshd-SshServer[5bcea91b](port=12133)-nio2-thread-2] DEBUG org.apache.sshd.server.forward.TcpipServerChannel - close(TcpipServerChannel[id=3, recipient=4]-ServerSessionImpl[test5@/127.0.0.1:53702])[Graceful] state already Graceful17:52:26.794 [sshd-SshServer[5bcea91b](port=12133)-nio2-thread-3] WARN org.apache.sshd.common.io.nio2.Nio2Session - exceptionCaught(Nio2Session[local=/127.0.0.1:33528, remote=/127.0.0.1:12345]) Exception handler threw OutOfMemoryError, closing the session: GC overhead limit exceeded at sun.nio.ch.AsynchronousSocketChannelImpl.write(AsynchronousSocketChannelImpl.java:382) at sun.nio.ch.AsynchronousSocketChannelImpl.write(AsynchronousSocketChannelImpl.java:399) at org.apache.sshd.common.io.nio2.Nio2Session.doWriteCycle(Nio2Session.java:420) at org.apache.sshd.common.io.nio2.Nio2Session.startWriting(Nio2Session.java:404) at org.apache.sshd.common.io.nio2.Nio2Session.finishWrite(Nio2Session.java:495) at org.apache.sshd.common.io.nio2.Nio2Session.handleCompletedWriteCycle(Nio2Session.java:465) at org.apache.sshd.common.io.nio2.Nio2Session$2.onCompleted(Nio2Session.java:429) at org.apache.sshd.common.io.nio2.Nio2Session$2.onCompleted(Nio2Session.java:426) at org.apache.sshd.common.io.nio2.Nio2CompletionHandler.lambda$completed$0(Nio2CompletionHandler.java:38)17:52:26.045 [sshd-SshServer[5bcea91b](port=12133)-nio2-thread-2] DEBUG org.apache.sshd.common.io.nio2.Nio2Session - close(Nio2Session[local=/127.0.0.1:33522, remote=/127.0.0.1:12345]) Closing immediately at java.security.AccessController.doPrivileged(Native Method)17:52:26.869 [sshd-SshServer[5bcea91b](port=12133)-nio2-thread-2] DEBUG org.apache.sshd.common.io.nio2.Nio2Session - doCloseImmediately(Nio2Session[local=/127.0.0.1:33522, remote=/127.0.0.1:12345]) closing socket=sun.nio.ch.UnixAsynchronousSocketChannelImpl[connected local=/127.0.0.1:33522 remote=/127.0.0.1:12345] at org.apache.sshd.common.io.nio2.Nio2CompletionHandler.completed(Nio2CompletionHandler.java:37) at sun.nio.ch.Invoker.invokeUnchecked(Invoker.java:126) at sun.nio.ch.Invoker.invokeDirect(Invoker.java:157)17:52:27.568 [sshd-SshServer[5bcea91b](port=12133)-nio2-thread-6] DEBUG org.apache.sshd.common.io.nio2.Nio2Session - exceptionCaught(Nio2Session[local=/127.0.0.1:33530, remote=/127.0.0.1:12345]) caught OutOfMemoryError[GC overhead limit exceeded] - calling handler17:52:27.568 [sshd-SshServer[5bcea91b](port=12133)-nio2-thread-6] DEBUG org.apache.sshd.server.forward.TcpipServerChannel - exceptionCaught(TcpipServerChannel[id=7, recipient=8]-ServerSessionImpl[test5@/127.0.0.1:53702]) signal close immediately=false due to OutOfMemoryError[GC overhead limit exceeded]17:52:27.568 [sshd-SshServer[5bcea91b](port=12133)-nio2-thread-6] DEBUG org.apache.sshd.server.forward.TcpipServerChannel - close(TcpipServerChannel[id=7, recipient=8]-ServerSessionImpl[test5@/127.0.0.1:53702])[Graceful] state already Graceful at sun.nio.ch.UnixAsynchronousSocketChannelImpl.implWrite(UnixAsynchronousSocketChannelImpl.java:736) at sun.nio.ch.AsynchronousSocketChannelImpl.write(AsynchronousSocketChannelImpl.java:382)
> {code}
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