FtpFileSystem causes deadlock
-----------------------------
Key: VFS-293
URL: https://issues.apache.org/jira/browse/VFS-293
Project: Commons VFS
Issue Type: Bug
Affects Versions: 1.0
Reporter: Johannes Scharf
I use Commons VFS to access FTP from multiple threads. In each thread I create
directories and copy files on the FTP server.
Nearly everytime when i run the program a deadlock occurs which causes all
threads to hang. I've created a stacktrace with "jstack" which clearly shows
where the deadlock is happening.
Stacktrace:
{noformat}
Found one Java-level deadlock:
=============================
"pool-1-thread-5":
waiting to lock monitor 0x030813b4 (object 0x22f972e8, a
org.apache.commons.vfs.provider.ftp.FtpFileSystem),
which is held by "pool-1-thread-2"
"pool-1-thread-2":
waiting to lock monitor 0x03082c7c (object 0x22f999e0, a java.lang.Object),
which is held by "pool-1-thread-4"
"pool-1-thread-4":
waiting to lock monitor 0x030813b4 (object 0x22f972e8, a
org.apache.commons.vfs.provider.ftp.FtpFileSystem),
which is held by "pool-1-thread-2"
Java stack information for the threads listed above:
===================================================
"pool-1-thread-5":
at
org.apache.commons.vfs.provider.AbstractFileSystem.streamOpened(AbstractFileSystem.java:569)
- waiting to lock <0x22f972e8> (a
org.apache.commons.vfs.provider.ftp.FtpFileSystem)
at
org.apache.commons.vfs.provider.DefaultFileContent.streamOpened(DefaultFileContent.java:92)
at
org.apache.commons.vfs.provider.DefaultFileContent.getOutputStream(DefaultFileContent.java:377)
at
at.js.jtransporter.transporter.VFSTransporter.createFile(VFSTransporter.java:119)
at
at.js.jtransporter.worker.resource.ResourceWorker.createFile(ResourceWorker.java:80)
at
at.js.jtransporter.worker.resource.ResourceWorker.processJob(ResourceWorker.java:51)
at
at.js.jtransporter.worker.AbstractRunnableWorker.run(AbstractRunnableWorker.java:82)
at
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:885)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:907)
at java.lang.Thread.run(Thread.java:619)
"pool-1-thread-2":
at
org.apache.commons.vfs.provider.ftp.FtpFileSystem.putClient(FtpFileSystem.java:137)
- waiting to lock <0x22f999e0> (a java.lang.Object)
at
org.apache.commons.vfs.provider.ftp.FtpFileObject.doGetChildren(FtpFileObject.java:158)
at
org.apache.commons.vfs.provider.ftp.FtpFileObject.getChildFile(FtpFileObject.java:103)
at
org.apache.commons.vfs.provider.ftp.FtpFileObject.getInfo(FtpFileObject.java:181)
at
org.apache.commons.vfs.provider.ftp.FtpFileObject.refresh(FtpFileObject.java:208)
at
org.apache.commons.vfs.provider.AbstractFileSystem.resolveFile(AbstractFileSystem.java:319)
- locked <0x22f972e8> (a
org.apache.commons.vfs.provider.ftp.FtpFileSystem)
at
org.apache.commons.vfs.provider.AbstractFileSystem.resolveFile(AbstractFileSystem.java:267)
- locked <0x22f972e8> (a
org.apache.commons.vfs.provider.ftp.FtpFileSystem)
at
org.apache.commons.vfs.provider.AbstractFileObject.getParent(AbstractFileObject.java:512)
- locked <0x22f972e8> (a
org.apache.commons.vfs.provider.ftp.FtpFileSystem)
at
org.apache.commons.vfs.provider.ftp.FtpFileObject.getInfo(FtpFileObject.java:177)
at
org.apache.commons.vfs.provider.ftp.FtpFileObject.refresh(FtpFileObject.java:208)
at
org.apache.commons.vfs.provider.AbstractFileSystem.resolveFile(AbstractFileSystem.java:319)
- locked <0x22f972e8> (a
org.apache.commons.vfs.provider.ftp.FtpFileSystem)
at
org.apache.commons.vfs.provider.AbstractFileSystem.resolveFile(AbstractFileSystem.java:267)
- locked <0x22f972e8> (a
org.apache.commons.vfs.provider.ftp.FtpFileSystem)
at
org.apache.commons.vfs.provider.AbstractFileObject.resolveFile(AbstractFileObject.java:670)
at
at.js.jtransporter.transporter.VFSTransporter.createFile(VFSTransporter.java:118)
at
at.js.jtransporter.worker.resource.ResourceWorker.createFile(ResourceWorker.java:80)
at
at.js.jtransporter.worker.resource.ResourceWorker.processJob(ResourceWorker.java:51)
at
at.js.jtransporter.worker.AbstractRunnableWorker.run(AbstractRunnableWorker.java:82)
at
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:885)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:907)
at java.lang.Thread.run(Thread.java:619)
"pool-1-thread-4":
at
org.apache.commons.vfs.provider.AbstractFileSystem.resolveFile(AbstractFileSystem.java:267)
- waiting to lock <0x22f972e8> (a
org.apache.commons.vfs.provider.ftp.FtpFileSystem)
at
org.apache.commons.vfs.provider.AbstractFileSystem.getRoot(AbstractFileSystem.java:242)
at
org.apache.commons.vfs.provider.ftp.FtpFileSystem.getClient(FtpFileSystem.java:108)
- locked <0x22f999e0> (a java.lang.Object)
at
org.apache.commons.vfs.provider.ftp.FtpFileObject.doGetOutputStream(FtpFileObject.java:490)
at
org.apache.commons.vfs.provider.AbstractFileObject.getOutputStream(AbstractFileObject.java:1219)
at
org.apache.commons.vfs.provider.DefaultFileContent.getOutputStream(DefaultFileContent.java:373)
at
at.js.jtransporter.transporter.VFSTransporter.createFile(VFSTransporter.java:119)
at
at.js.jtransporter.worker.resource.ResourceWorker.createFile(ResourceWorker.java:80)
at
at.js.jtransporter.worker.resource.ResourceWorker.processJob(ResourceWorker.java:51)
at
at.js.jtransporter.worker.AbstractRunnableWorker.run(AbstractRunnableWorker.java:82)
at
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:885)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:907)
at java.lang.Thread.run(Thread.java:619)
Found 1 deadlock.
{noformat}
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