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https://issues.apache.org/jira/browse/VFS-627?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16040745#comment-16040745
]
Aditya Kunkolienkar commented on VFS-627:
-----------------------------------------
I am facing similar issue where it gets stuck in DefaultFileContent line number
894.
It gets stuck in below while loop after few iterations:
final byte[] buffer = new byte[bufferSize];
int n = 0;
while (-1 != (n = input.read(buffer)))
{
output.write(buffer, 0, n);
count += n;
}
> SFTP randomly hangs when copying a file on remote server
> --------------------------------------------------------
>
> Key: VFS-627
> URL: https://issues.apache.org/jira/browse/VFS-627
> Project: Commons VFS
> Issue Type: Bug
> Affects Versions: 2.1
> Environment: Java 1.8.0_92
> VFS 2.1
> JSch 0.1.53
> Reporter: Henri Hagberg
>
> I have a process where a file is first copied over SFTP to local server and
> then on the remote server the file is copied to another location on that
> server for archiving. Both are done using {{FileObject#copyFrom}}. Now I've
> encountered twice the situation where during archiving (on remote server) the
> copy action hangs indefinitely (the process was left running for over 24
> hours). In both cases the issue happened when around 2000 files had been
> transferred (typical amount is under 100).
> The problem is difficult to reproduce since it doesn't always happen even
> with large number of files. Based on the stacktrace and random occurrences it
> might be a concurrency issue. The code using VFS however is single threaded.
> {code}
> Attaching to process ID 128021, please wait...
> Debugger attached successfully.
> Server compiler detected.
> JVM version is 25.92-b14
> Deadlock Detection:
> No deadlocks found.
> Thread 19073: (state = BLOCKED)
> Thread 128165: (state = BLOCKED)
> - java.lang.Object.wait(long) @bci=0 (Compiled frame; information may be
> imprecise)
> - java.lang.ref.ReferenceQueue.remove(long) @bci=59, line=143 (Compiled
> frame)
> - org.apache.commons.vfs2.cache.SoftRefFilesCache$SoftRefReleaseThread.run()
> @bci=26, line=84 (Compiled frame)
> Thread 128164: (state = BLOCKED)
> - java.lang.Object.wait(long) @bci=0 (Compiled frame; information may be
> imprecise)
> - java.io.PipedInputStream.awaitSpace() @bci=23, line=273 (Compiled frame)
> - java.io.PipedInputStream.receive(byte[], int, int) @bci=31, line=231
> (Compiled frame)
> - java.io.PipedOutputStream.write(byte[], int, int) @bci=77, line=149
> (Compiled frame)
> - com.jcraft.jsch.IO.put(byte[], int, int) @bci=7, line=64 (Compiled frame)
> - com.jcraft.jsch.Channel.write(byte[], int, int) @bci=7, line=438 (Compiled
> frame)
> - com.jcraft.jsch.Session.run() @bci=1260, line=1624 (Compiled frame)
> - java.lang.Thread.run() @bci=11, line=745 (Interpreted frame)
> Thread 128139: (state = BLOCKED)
> Thread 128138: (state = BLOCKED)
> - java.lang.Object.wait(long) @bci=0 (Compiled frame; information may be
> imprecise)
> - java.lang.ref.ReferenceQueue.remove(long) @bci=59, line=143 (Compiled
> frame)
> - java.lang.ref.ReferenceQueue.remove() @bci=2, line=164 (Compiled frame)
> - java.lang.ref.Finalizer$FinalizerThread.run() @bci=36, line=209
> (Interpreted frame)
> Thread 128137: (state = BLOCKED)
> - java.lang.Object.wait(long) @bci=0 (Compiled frame; information may be
> imprecise)
> - java.lang.Object.wait() @bci=2, line=502 (Compiled frame)
> - java.lang.ref.Reference.tryHandlePending(boolean) @bci=54, line=191
> (Compiled frame)
> - java.lang.ref.Reference$ReferenceHandler.run() @bci=1, line=153
> (Interpreted frame)
> Thread 128022: (state = BLOCKED)
> - java.lang.Object.wait(long) @bci=0 (Compiled frame; information may be
> imprecise)
> - com.jcraft.jsch.Session.write(com.jcraft.jsch.Packet,
> com.jcraft.jsch.Channel, int) @bci=89, line=1261 (Compiled frame)
> - com.jcraft.jsch.ChannelSftp.sendWRITE(byte[], long, byte[], int, int)
> @bci=191, line=2619 (Compiled frame)
> - com.jcraft.jsch.ChannelSftp.access$100(com.jcraft.jsch.ChannelSftp,
> byte[], long, byte[], int, int) @bci=9, line=36 (Compiled frame)
> - com.jcraft.jsch.ChannelSftp$1.write(byte[], int, int) @bci=77, line=791
> (Compiled frame)
> - java.io.BufferedOutputStream.write(byte[], int, int) @bci=20, line=122
> (Compiled frame)
> - org.apache.commons.vfs2.util.MonitorOutputStream.write(byte[], int, int)
> @bci=8, line=123 (Compiled frame)
> - java.io.BufferedOutputStream.flushBuffer() @bci=20, line=82 (Compiled
> frame)
> - java.io.BufferedOutputStream.write(byte[], int, int) @bci=39, line=126
> (Compiled frame)
> - org.apache.commons.vfs2.util.MonitorOutputStream.write(byte[], int, int)
> @bci=8, line=123 (Compiled frame)
> -
> org.apache.commons.vfs2.provider.DefaultFileContent.write(java.io.OutputStream,
> int) @bci=35, line=892 (Compiled frame)
> -
> org.apache.commons.vfs2.provider.DefaultFileContent.write(java.io.OutputStream)
> @bci=5, line=865 (Compiled frame)
> -
> org.apache.commons.vfs2.provider.DefaultFileContent.write(org.apache.commons.vfs2.FileContent)
> @bci=9, line=828 (Compiled frame)
> -
> org.apache.commons.vfs2.provider.DefaultFileContent.write(org.apache.commons.vfs2.FileObject)
> @bci=7, line=849 (Compiled frame)
> -
> org.apache.commons.vfs2.FileUtil.copyContent(org.apache.commons.vfs2.FileObject,
> org.apache.commons.vfs2.FileObject) @bci=7, line=90 (Compiled frame)
> -
> org.apache.commons.vfs2.provider.AbstractFileObject.copyFrom(org.apache.commons.vfs2.FileObject,
> org.apache.commons.vfs2.FileSelector) @bci=148, line=338 (Compiled frame)
> ...
> {code}
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