[jcifs] Possible deadlocking between jcifs.smb.Dfs and jcifs.smb.SmbTransport
Xavier Roche
roche+kml2 at exalead.com
Mon Mar 5 00:00:23 MST 2012
On 03/05/2012 04:20 AM, Michael B Allen wrote:
> No. It is not ok to use the same SmbFile instance with more than one
> thread at a time. You can use multiple threads but you just can't use
> the same SmbFile object with multiple threads at the same time.
Okay, noted.
> Are you seeing the deadlock with different SmbFile instances or is it
> only when trying to use the same SmbFile object with multiple threads?
I am seeing the same deadlock, even when using a single SmbFile on each
thread, when accessing the same DFS tree. (I even synchronized all calls
to SmbFile to ensure that there was no reentrancy issue)
If I am not mistaken, the way to reproduce the issue is to have multiple
threads working with *different* files, but inside a *common* DFS (the
files were created by the same listFiles() probably).
A small torture test (32 threads) will typically deadlock within
seconds/minutes.
[ A "regular" program would also deadlock, but more "randomly"/slowly. ]
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