[
https://issues.apache.org/jira/browse/SSHD-1173?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17613590#comment-17613590
]
Kirk commented on SSHD-1173:
----------------------------
I believe I may have also run into this running against MOVEIT transfer 2018
SP1 where transfers (11MB) are hanging in the same way as described above.
> 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
>
> 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
