[jcifs] Threads locked while calling SmbFile.getSecurity
Marc Brette
marc.brette at gmail.com
Tue Jul 29 14:44:12 GMT 2008
Hi Mike,
On another machine, I actually hit the issue with only 14 threads.
It seems this is machine dependent.
Do you think about a work-around so that I could avoid this limit ?
Note: I didn't try the new versions you shipped since, but it didn't seem to
solve the issue.
--Marc
On Wed, Jun 4, 2008 at 6:58 PM, Michael B Allen <ioplex at gmail.com> wrote:
> I think you're hitting jcifs.smb.maxBuffers which defaults to 16.
>
> But I have to wonder how you're getting into that scenario and if
> increasing that value is the right thing to do.
>
> Mike
>
> On 6/4/08, Marc Brette <marc.brette at gmail.com> wrote:
> > I have an issue where 16 threads calling SmbFile.getSecurity are blocked.
> > When I have only 15 threads, it works fine (note that each thread
> accesses a
> > different document, but on the same server).
> > I use JCIFS 1.2.21. And tested on different shared drives (with and
> without
> > credentials). I initially tested with 1.2.18 with a more complex example
> so
> > I guess it s not specific to the JCIFS version.
> > Is it something known ? I saw some thread talking about deadlock in
> jcifs
> > but it seemed to be in situation unlikely to occur in reality.
> >
> > Here is my code:
> > import java.util.List;
> > import java.util.Arrays;
> >
> > import jcifs.smb.SmbFile;
> > import jcifs.smb.NtlmPasswordAuthentication;
> >
> > public class TestDeadlock
> > {
> > static
> > {
> > System.setProperty("java.protocol.handler.pkgs",
> > "jcifs");
> > }
> >
> > public static void main(String[] args) throws InterruptedException
> > {
> > final List<String> dataset = Arrays.asList(
> >
> > "smb://frgr1dev1/Y_Drive/Documentation/javadocs/ant/ant
> > 1.6.2 api/org/apache/tools/zip/package-frame.html"
> > ,
> > "smb://frgr1dev1/Y_Drive/Documentation/javadocs/ant/ant
> > 1.6.2
> >
> api/org/apache/tools/ant/taskdefs/optional/ejb/BorlandDeploymentTool.html"
> > ,
> > "smb://frgr1dev1/Y_Drive/Documentation/javadocs/ant/ant
> > 1.6.2 api/org/apache/tools/ant/types/Reference.html"
> > ,
> >
> "smb://frgr1dev1/Y_Drive/Documentation/javadocs/jdk/jdk1.3.1/javax/rmi/package-use.html"
> > ,
> >
> "smb://frgr1dev1/Y_Drive/Documentation/javadocs/jdk/jdk1.3.1/java/io/FilterOutputStream.html"
> > ,
> >
> "smb://frgr1dev1/Y_Drive/Documentation/javadocs/jdk/jdk1.3.1/javax/accessibility/AccessibleTableModelChange.html"
> > ,
> >
> "smb://frgr1dev1/Y_Drive/Documentation/javadocs/jdk/jdk1.4.2/org/omg/stub/java/"
> > ,
> >
> "smb://frgr1dev1/Y_Drive/Documentation/javadocs/jdk/jdk1.3.1/javax/transaction/InvalidTransactionException.html"
> > ,
> > "smb://frgr1dev1/Y_Drive/Documentation/javadocs/ant/ant
> > 1.6.2
> >
> api/org/apache/tools/ant/taskdefs/optional/junit/DOMUtil.NodeListImpl.html"
> > ,
> >
> "smb://frgr1dev1/Y_Drive/Documentation/javadocs/jdk/jdk1.4.2/java/awt/geom/AffineTransform.html"
> > ,
> >
> "smb://frgr1dev1/Y_Drive/Documentation/javadocs/jdk/jdk1.3.1/javax/naming/ldap/package-frame.html"
> > ,
> >
> "smb://frgr1dev1/Y_Drive/Documentation/javadocs/jdk/jdk1.3.1/java/awt/Shape.html"
> > ,
> >
> "smb://frgr1dev1/Y_Drive/Documentation/javadocs/jdk/jdk1.4.2/javax/transaction/xa/package-summary.html"
> > ,
> > "smb://frgr1dev1/Y_Drive/Documentation/javadocs/ant/ant
> > 1.6.2
> > api/org/apache/tools/ant/taskdefs/optional/script/package-summary.html"
> > ,
> >
> "smb://frgr1dev1/Y_Drive/Documentation/javadocs/jdk/jdk1.4.2/javax/net/ServerSocketFactory.html");
> >
> > int start = 0;
> > int end = 15;
> > Thread[] workers = new Thread[end - start];
> > for (int i = start; i < end; i++)
> > {
> > final String url = dataset.get(i);
> > workers[i - start] = new Thread(new Runnable()
> > {
> > public void run()
> > {
> > try
> > {
> > SmbFile f = new SmbFile(url);
> > System.out.println(url + " security = " +
> > f.getSecurity(true)); //This trace never shows up
> >
> > } catch (Throwable e)
> > {
> > e.printStackTrace();
> > }
> > }
> > });
> > }
> >
> > for (Thread worker : workers)
> > {
> > worker.start();
> > }
> >
> > for (Thread worker : workers)
> > {
> > worker.join();
> > }
> > }
> > }
> >
> > Here is an extract of the threads stacktrace dump:
> >
> > "Thread-4" prio=6 tid=0x0033dde8 nid=0x64d4 in Object.wait()
> > [0x031bf000..0x031bf9e8]
> > at java.lang.Object.wait(Native Method)
> > - waiting on <0x2465e260> (a [Ljava.lang.Object;)
> > at java.lang.Object.wait(Object.java:474)
> > at
> > jcifs.smb.BufferCache.getBuffers(BufferCache.java:55)
> > - locked <0x2465e260> (a [Ljava.lang.Object;)
> > at jcifs.smb.SmbTransport.send(SmbTransport.java:547)
> > at jcifs.smb.SmbSession.send(SmbSession.java:239)
> > - locked <0x2467f780> (a java.lang.Object)
> > at jcifs.smb.SmbTree.send(SmbTree.java:109)
> > at jcifs.smb.SmbFile.send(SmbFile.java:695)
> > at
> >
> jcifs.smb.TransactNamedPipeOutputStream.write(TransactNamedPipeOutputStream.java:65)
> > at
> > jcifs.dcerpc.DcerpcPipeHandle.doSendFragment(DcerpcPipeHandle.java:59)
> > at
> > jcifs.dcerpc.DcerpcHandle.sendrecv(DcerpcHandle.java:164)
> > at
> > jcifs.dcerpc.msrpc.LsaPolicyHandle.<init>(LsaPolicyHandle.java:34)
> > at jcifs.smb.SID.resolveSids0(SID.java:136)
> > at jcifs.smb.SID.resolveSids(SID.java:179)
> > at jcifs.smb.SmbFile.processAces(SmbFile.java:2774)
> > at jcifs.smb.SmbFile.getSecurity(SmbFile.java:2808)
> > at TestDeadlock$1.run(TestDeadlock.java:84)
> > at java.lang.Thread.run(Thread.java:595)
> >
> > "Thread-3" prio=6 tid=0x0033dc60 nid=0x4494 waiting for monitor entry
> > [0x0317f000..0x0317fce8]
> > at jcifs.smb.SmbTree.treeConnect(SmbTree.java:128)
> > - waiting to lock <0x2467f780> (a java.lang.Object)
> > at jcifs.smb.SmbTree.send(SmbTree.java:64)
> > at jcifs.smb.SmbFile.send(SmbFile.java:695)
> > at
> >
> jcifs.smb.TransactNamedPipeOutputStream.write(TransactNamedPipeOutputStream.java:65)
> > at
> > jcifs.dcerpc.DcerpcPipeHandle.doSendFragment(DcerpcPipeHandle.java:59)
> > at
> > jcifs.dcerpc.DcerpcHandle.sendrecv(DcerpcHandle.java:164)
> > at
> > jcifs.dcerpc.msrpc.LsaPolicyHandle.<init>(LsaPolicyHandle.java:34)
> > at jcifs.smb.SID.resolveSids0(SID.java:136)
> > at jcifs.smb.SID.resolveSids(SID.java:179)
> > at jcifs.smb.SmbFile.processAces(SmbFile.java:2774)
> > at jcifs.smb.SmbFile.getSecurity(SmbFile.java:2808)
> > at TestDeadlock$1.run(TestDeadlock.java:84)
> > at java.lang.Thread.run(Thread.java:595)
> >
> > ... other threads stack traces are similar to "Thread-3" above.
> >
> > Regards
> > -- Marc
> >
> >
> >
> >
>
>
> --
> Michael B Allen
> PHP Active Directory SPNEGO SSO
> http://www.ioplex.com/
>
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