Deadlock (kind of) at Server shutdown

Deadlock can occur at server shutdown (with remote SHUTDOWN command)
with 1.8.0.7, see locked stack traces below.
I don't believe you'll need more details (cause I easily found this
race condition reason in Server code), but if you do, feel free to
ask.

The server doesn't answer the shutdown command, keeps connection open,
and doesn't exit.
This is quite serious as it prevents the client application from shuting down.

Thanks in advance.

Francois.

"HSQLDB Server @1df8b99" prio=6 tid=0x4918a058 nid=0x1330 waiting on
condition [0x4957f000..0x4957fc68]
        at java.lang.Thread.sleep(Native Method)
        at org.hsqldb.Server.shutdown(Unknown Source)
        - locked <0x07a04560> (a org.hsqldb.Server)
        at org.hsqldb.Server.run(Unknown Source)
        at org.hsqldb.Server.access$000(Unknown Source)
        at org.hsqldb.Server$ServerThread.run(Unknown Source)

"HSQLDB Connection @9b8ff9" prio=6 tid=0x4918e3f0 nid=0x318 waiting
for monitor entry [0x4a61f000..0x4a61fbe8]
        at org.hsqldb.Server.print(Unknown Source)
        - waiting to lock <0x07a04560> (a org.hsqldb.Server)
        at org.hsqldb.Server.printWithThread(Unknown Source)
        at org.hsqldb.Server.releaseServerSocket(Unknown Source)
        at org.hsqldb.Server.stop(Unknown Source)
        at org.hsqldb.Server.notify(Unknown Source)
        at org.hsqldb.DatabaseManager.notifyServers(Unknown Source)
        at org.hsqldb.DatabaseManager.removeDatabase(Unknown Source)
        at org.hsqldb.Database.close(Unknown Source)
        at org.hsqldb.DatabaseCommandInterpreter.processShutdown(Unknown Source)
        at org.hsqldb.DatabaseCommandInterpreter.executePart(Unknown Source)
        at org.hsqldb.DatabaseCommandInterpreter.execute(Unknown Source)
        at org.hsqldb.Session.sqlExecuteDirectNoPreChecks(Unknown Source)
        - locked <0x07a0f9b8> (a org.hsqldb.Database)
        at org.hsqldb.Session.execute(Unknown Source)
        - locked <0x07a0f9b8> (a org.hsqldb.Database)
        at org.hsqldb.ServerConnection.run(Unknown Source)
        at java.lang.Thread.run(Thread.java:595)

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