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Kirk Rasmussen commented on SSHD-1173: -------------------------------------- Try explaining the above to a customer will be nightmarish. I strongly urge you to reconsider keeping this option. I will say its an old unsupported SFTP server (Windows based on the sshlib project I'm guessing based on server id) but I imagine there's other out there with same problem: {code:java} Server Version: SSH-2.0-9.99 sshlib {code} We don't even have access to latest MOVEIT to confirm if they have fixed it or not. > SFTP worker threads got stuck while processing PUT methods against one > specific SFTP server > ------------------------------------------------------------------------------------------- > > Key: SSHD-1173 > URL: https://issues.apache.org/jira/browse/SSHD-1173 > Project: MINA SSHD > Issue Type: Question > Affects Versions: 2.6.0 > Reporter: Pavel Pohner > Priority: Critical > Labels: SFTP, mina, sshd > Time Spent: 10m > Remaining Estimate: 0h > > Hey guys, > Recently I've encountered one remote SFTP server, that causes SFTP worker > threads to enter TIMED_WAITING state, from which they do not recover. Please, > take a look into this thread dump: > {code:java} > SFTP-worker-3 #2155 prio=5 os_prio=0 cpu=61692.09ms elapsed=1136151.86s > tid=0x00007fe41c005800 nid=0x18808 in Object.wait() > [0x00007fe145b1d000]SFTP-worker-3" #2155 prio=5 os_prio=0 cpu=61692.09ms > elapsed=1136151.86s tid=0x00007fe41c005800 nid=0x18808 in Object.wait() > [0x00007fe145b1d000] java.lang.Thread.State: TIMED_WAITING (on object > monitor) at java.lang.Object.wait(java.base@11.0.10/Native Method) - waiting > on <no object reference available> at > org.apache.sshd.common.future.DefaultSshFuture.await0(DefaultSshFuture.java:69) > - waiting to re-lock in wait() <0x00000006e3bbc420> (a > org.apache.sshd.common.channel.IoWriteFutureImpl) at > org.apache.sshd.common.future.AbstractSshFuture.verifyResult(AbstractSshFuture.java:109) > at > org.apache.sshd.common.io.AbstractIoWriteFuture.verify(AbstractIoWriteFuture.java:39) > at > org.apache.sshd.common.io.AbstractIoWriteFuture.verify(AbstractIoWriteFuture.java:30) > at > org.apache.sshd.common.future.VerifiableFuture.verify(VerifiableFuture.java:43) > at > org.apache.sshd.sftp.client.impl.DefaultSftpClient.send(DefaultSftpClient.java:292) > at > org.apache.sshd.sftp.client.impl.SftpOutputStreamAsync.flush(SftpOutputStreamAsync.java:210) > at > org.apache.sshd.sftp.client.impl.SftpOutputStreamAsync.write(SftpOutputStreamAsync.java:141) > at java.io.InputStream.transferTo(java.base@11.0.10/InputStream.java:705) at > com.mina.command.Put.replyInto(Put.java:55) at > com.sftpserver.MinaSftpHandler.channelReadInternal(MinaSftpHandler.java:251) > at > com.sftpserver.MinaSftpHandler.lambda$channelRead$0(MinaSftpHandler.java:125) > at com.sftpserver.MinaSftpHandler$$Lambda$392/0x0000000800764040.run(Unknown > Source) at > java.util.concurrent.Executors$RunnableAdapter.call(java.base@11.0.10/Executors.java:515) > at > java.util.concurrent.FutureTask.run(java.base@11.0.10/FutureTask.java:264) at > java.util.concurrent.ThreadPoolExecutor.runWorker(java.base@11.0.10/ThreadPoolExecutor.java:1128) > at > java.util.concurrent.ThreadPoolExecutor$Worker.run(java.base@11.0.10/ThreadPoolExecutor.java:628) > at java.lang.Thread.run(java.base@11.0.10/Thread.java:834) > {code} > Seems like the thread is waiting for lock in > org.apache.sshd.common.future.DefaultSshFuture.await0(DefaultSshFuture.java), > I'm currently not sure what thread holds the lock and why it's not ever > released. > Also, I'm not able to reproduce this, but it constantly happens to all the > PUT methods targeting one specific remote server (which I don't own), so I > suppose there would be something odd with the remote server, but it doesn't > mean, that we shouldn't be able to deal with that. > Have you ever seen such behavior? Could it be Mina sshd's bug? (seems like > verify() in > org.apache.sshd.sftp.client.impl.DefaultSftpClient.send(DefaultSftpClient.java:292) > is called without any timeout, which then defaults to LONG.MAX here: at > org.apache.sshd.common.future.VerifiableFuture.verify(VerifiableFuture.java:43), > shouldn't we have configurable timeout here? or what's the point of default > timeout? what are we really waiting for in at > org.apache.sshd.common.future.DefaultSshFuture.await0(DefaultSshFuture.java:69)?) -- This message was sent by Atlassian Jira (v8.20.10#820010) --------------------------------------------------------------------- To unsubscribe, e-mail: dev-unsubscr...@mina.apache.org For additional commands, e-mail: dev-h...@mina.apache.org