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[FB-Tracker] Created: (CORE-5517) Classical server periodically raise "Global mapping memory overflow" and need to be restarted to accept new connections

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[FB-Tracker] Created: (CORE-5517) Classical server periodically raise "Global mapping memory overflow" and need to be restarted to accept new connections

JIRA tracker@firebirdsql.org
Classical server periodically raise "Global mapping memory overflow" and need to be restarted to accept new connections
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                 Key: CORE-5517
                 URL: http://tracker.firebirdsql.org/browse/CORE-5517
             Project: Firebird Core
          Issue Type: Bug
          Components: Engine
    Affects Versions: 3.0.2
         Environment: Ubuntu 16.04 64 bits, 4 cores, 32gb ram
            Reporter: Christian Pradelli


I have a server in production.

Firebird Classical server
Ubuntu 16.04 64 bits
4 cores
32gb ram

It is serving 30 databases with 2~5 connections each one.
Every 4 to 5 days new client connections raise the error "Global mapping memory overflow" and the server needs to be completely rebooted to continue working.

The problem started when we switch from SupersServer to Classical Server.

The only place where I found the text error in source code is in /src/jrd/mapping.cpp

if (process >= sMem->processes)
                {
                        sMem->processes++;
                        if (((U_IPTR) &sMem->process[sMem->processes]) - ((U_IPTR) sMem) > DEFAULT_SIZE)
                        {
                                sMem->processes--;
                                (Arg::Gds(isc_random) << "Global mapping memory overflow").raise();
                        }
                }

Which could be the problem?

Does any firebird.conf parameter affect this issue?

Regards
Christian

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