[jcifs] Possible deadlock on SmbFile.getInputStream()?

[Michael B Allen]

Hi Robin,

I don't think this is a deadlock. And it doesn't look like it has much
if anything to do with JCIFS. At least it is clear that the thread
shown is just waiting on reading data from the socket. That is deep in
the Java sockets layer.

Verify that your soTimeout is set correctly. If the soTimeout is set
correctly, I would think the socket would have to give up after some
time. Or maybe things are just really really slow and it's just
failing over each operation / server very slowly such that it looks
like it's doing nothing.

Mike


On Tue, Mar 15, 2016 at 3:27 AM, Robin Jansohn <snoopi30 at web.de> wrote:
> I've written a parser which (for now) sequentially reads a file from around
> 10000 shares. I'm getting what seems like a deadlock after a couple of hours
> of parsing (last time after ~4.5h). I'm not doing any threading yet to keep
> it simple, connectionTimeout and readTimeout are set to 30 seconds.
>
> Here's the thread dump of the interesting threads (I can also send the full
> thread dump):
> "RMI TCP Connection(30)-10.189.22.141" #1603 daemon prio=5 os_prio=0
> tid=0x00000000551c3000 nid=0x11ec runnable [0x00000000594fe000]
>    java.lang.Thread.State: RUNNABLE
>         at java.net.SocketInputStream.socketRead0(Native Method)
>         at java.net.SocketInputStream.socketRead(SocketInputStream.java:116)
>         at java.net.SocketInputStream.read(SocketInputStream.java:170)
>         at java.net.SocketInputStream.read(SocketInputStream.java:141)
>         at java.io.BufferedInputStream.fill(BufferedInputStream.java:246)
>         at java.io.BufferedInputStream.read(BufferedInputStream.java:265)
>         - locked <0x00000000f8780398> (a java.io.BufferedInputStream)
>         at java.io.FilterInputStream.read(FilterInputStream.java:83)
>         at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:550)
>         at
> sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:826)
>         at
> sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$256(TCPTransport.java:683)
>         at
> sun.rmi.transport.tcp.TCPTransport$ConnectionHandler$$Lambda$10/305000138.run(Unknown
> Source)
>         at java.security.AccessController.doPrivileged(Native Method)
>         at
> sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:682)
>         at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
>         at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
>         at java.lang.Thread.run(Thread.java:745)
>
>    Locked ownable synchronizers:
>         - <0x00000000f87804d8> (a java.util.concurrent.ThreadPoolExecutor$Worker)
>
> "main" #1 prio=5 os_prio=0 tid=0x00000000024af800 nid=0x434 in Object.wait()
> [0x000000000283e000]
>    java.lang.Thread.State: WAITING (on object monitor)
>         at java.lang.Object.wait(Native Method)
>         at java.lang.Object.wait(Object.java:502)
>         at jcifs.smb.SmbTree.treeConnect(SmbTree.java:143)
>         - locked <0x00000000e0780978> (a jcifs.smb.SmbTransport)
>         at jcifs.smb.SmbFile.doConnect(SmbFile.java:911)
>         at jcifs.smb.SmbFile.connect(SmbFile.java:954)
>         at jcifs.smb.SmbFile.connect0(SmbFile.java:880)
>         at jcifs.smb.SmbFile.open0(SmbFile.java:972)
>         at jcifs.smb.SmbFile.open(SmbFile.java:1006)
>         at jcifs.smb.SmbFileInputStream.<init>(SmbFileInputStream.java:73)
>         at jcifs.smb.SmbFileInputStream.<init>(SmbFileInputStream.java:65)
>         at jcifs.smb.SmbFile.getInputStream(SmbFile.java:2844)
>         at control.Parser.getFileEncoding(Parser.java:205)
>         at control.Parser.parse(Parser.java:141)
>         at control.Parser.run(Parser.java:85)
>         at control.Main.main(Main.java:40)
>
>    Locked ownable synchronizers:
>         - None
>
>
>
>
> --
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> Sent from the Samba - jcifs mailing list archive at Nabble.com.
>



-- 
Michael B Allen
Java Active Directory Integration
http://www.ioplex.com/