isql process in non-interactive session sometimes never ends
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                 Key: CORE-6172
                 URL: http://tracker.firebirdsql.org/browse/CORE-6172
             Project: Firebird Core
          Issue Type: Bug
          Components: ISQL
    Affects Versions: 3.0.3
         Environment: Windows, Java (for installation program)
            Reporter: A Drouard
            Priority: Blocker


Firebird server is deployed with it's own port for each instance of our 
application.
We have about 150 Firebird instances on the same machine.
We run isql in order to create Firebird users with a random generated password 
with the following command :
<absolute_path_to_firebird_dir>\isql.exe -b -m -o 
"<absolute_path_to_firebird_dir>\init-users.log" -user sysdba -input 
"<absolute_path_to_firebird_dir>\init-users.sql" employee

Sometimes, isql.exe process is blocked. In such case, users are not created and 
init-users.log file is empty.

The init-users.sql file is generated like this :

create user user1 password 'randompassword1';
create user user2 password 'randompassword2';
create user user3 password 'randompassword3';
grant create database to user user1;
grant create database to user user2;
commit;
quit;


The installation program executes the following actions :

1) Unzip Firebird server binaries
2) Run isql to create users
3) Configure RemoteServicePort in firebird.conf
4) Register Firebird as Windows service

As isql need exclusive access to Firebird engine, we run it before registering 
service.
May be, isql.exe is disturbed by other Firebid instances ?

How can I ensure that isql will not block ?
How can I have more logs ?

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