Can not restore in FB 3.0 SuperServer from .fbk which source .fdb was created 
on 2.5.4 and moved to READ-ONLY before backed up.
-------------------------------------------------------------------------------------------------------------------------------

                 Key: CORE-4748
                 URL: http://tracker.firebirdsql.org/browse/CORE-4748
             Project: Firebird Core
          Issue Type: Bug
          Components: Engine, GBAK, GFIX
    Affects Versions: 3.0 Beta 1
            Reporter: Pavel Zotov
         Attachments: core2018-read_only.fbk

1. Create new database on 2.5.4
2. Run: 
2.1 {FB25_HOME}\bin\gfix -mode read_only <this_25database.fdb>
2.3 {FB25_HOME}\bin\gbak -b <this_25database.fdb> <this_25database.fbk>

After that, try to restore .fbk in 3.0:
 {FB30_HOME}\gbak -rep this_25database.fbk  
localhost/3333:C:\FBTESTING\qa\fbt-repo\tmp\this_30database.fdb

On 3.0 SC & CS this will works fine, see gstat after end of this:
=====
C:\FBTESTING\qa\fbt-repo\tmp>C:\1INSTALL\FIREBIRD\fb30sC\gstat.exe -h 
CORE2018-READ_ONLY-SC.FDB

Database "C:\FBTESTING\QA\FBT-REPO\TMP\CORE2018-READ_ONLY-SC.FDB"
Database header page information:
        Flags                   0
        Generation              16
        System Change Number    0
        Page size               4096
        ODS version             12.0
        Oldest transaction      1
        Oldest active           2
        Oldest snapshot         2
        Next transaction        6
        Sequence number         0
        Next attachment ID      2
        Implementation          HW=Intel/i386 little-endian OS=Windows CC=MSVC
        Shadow count            0
        Page buffers            0
        Next header page        0
        Database dialect        3
        Creation date           Apr 13, 2015 2:20:52
        Attributes              force write, no reserve, read only

    Variable header data:
        Sweep interval:         20000
        *END*

C:\FBTESTING\qa\fbt-repo\tmp>C:\1INSTALL\FIREBIRD\fb30sC\gstat.exe -h 
CORE2018-READ_ONLY-Cs.FDB

Database "C:\FBTESTING\QA\FBT-REPO\TMP\CORE2018-READ_ONLY-CS.FDB"
Database header page information:
        Flags                   0
        Generation              20
        System Change Number    0
        Page size               4096
        ODS version             12.0
        Oldest transaction      1
        Oldest active           2
        Oldest snapshot         2
        Next transaction        8
        Sequence number         0
        Next attachment ID      4
        Implementation          HW=Intel/i386 little-endian OS=Windows CC=MSVC
        Shadow count            0
        Page buffers            0
        Next header page        0
        Database dialect        3
        Creation date           Apr 13, 2015 2:21:29
        Attributes              force write, no reserve, read only

    Variable header data:
        Sweep interval:         20000
        *END*
=====

But on 3.0 SuperServer it will hang infinite time, with zero CPU load. 
ISQL does not react to Ctrl-Break and can be closed only via psKill.exe or 
pressing 'CLOSE' icon on its window.

FB versions:

WI-V2.5.4.26856
WI-T3.0.0.31780


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