Attempt to change number of buffers in DB header leads to crash (either using 
gfix -b ... or fbsvcmgr prp_page_buffers ... ). Only 4.0 SuperServer is 
affected.
---------------------------------------------------------------------------------------------------------------------------------------------------------------

                 Key: CORE-5385
                 URL: http://tracker.firebirdsql.org/browse/CORE-5385
             Project: Firebird Core
          Issue Type: Bug
          Components: Engine, GFIX, SVCMGR
    Affects Versions: 4.0 Initial
            Reporter: Pavel Zotov


1)
echo create database 
'localhost/3400:C:\MIX\firebird\QA\fbt-repo\tmp\e40.fdb';|C:\MIX\firebird\fb40\isql
 -q -z

ISQL Version: WI-T4.0.0.420 Firebird 4.0 Unstable
Server version:
WI-T4.0.0.420 Firebird 4.0 Unstable
WI-T4.0.0.420 Firebird 4.0 Unstable/tcp (csprog)/P14
WI-T4.0.0.420 Firebird 4.0 Unstable/tcp (csprog)/P14

2)
C:\MIX\firebird\fb40\gfix -z -b 3000 
localhost/3400:C:\MIX\firebird\QA\fbt-repo\tmp\E40.FDB

gfix version WI-T4.0.0.420 Firebird 4.0 Unstable
Error reading data from the connection.

firebird.log:
===

CSPROG  Thu Oct 27 23:59:44 2016
        INET/inet_error: read errno = 10054, server host = localhost, address = 
127.0.0.1/3400


CSPROG  Thu Oct 27 23:59:45 2016
        setsockopt: error setting IPV6_V6ONLY to 0
===

The same result if run:

C:\MIX\firebird\fb30\fbsvcmgr localhost/3400:service_mgr action_properties 
prp_page_buffers 3000 dbname C:\MIX\firebird\QA\fbt-repo\tmp\E40.FDB


PS.
No such trouble on 4.0 SuperClassic.
No such trouble on 3.0 SuperServer.


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