Hello,
I am doing a research on software model checking and using an example
program in the JSch package as a subject for an experiment. By the
verification result, I found that program "ScpTo" in directory "example"
may produce an exception under a certain thread schedule. Here is a
summary of the bug.
- Two threads are involved: the main thread and a Session thread, which
is created by the call at (ScpTo.java: 29).
- There is no synchronization between these threads. As a result, they
run independently in parallel.
- The main thread runs along the following trace.
throw new JSchException("channel is not opened."); (Channel.java: 188)
channel.connect(); (ScpTo.java: 42)
- This happens if the main thread reaches the failed point before the
Session thread assigns member "recipient" at (Session.java: 1403).
I am not sure if the developer has been aware of this possibility. Even
though this specific execution order rarely occurs in actual execution,
I think it would be good to report the possible failure to the program
developer.
Regards,
Watcharin Leungwattanakit
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