internal Firebird consistency check (invalid SEND request (167), file: 
JrdStatement.cpp line: 325)
---------------------------------------------------------------------------------------------------

                 Key: CORE-5457
                 URL: http://tracker.firebirdsql.org/browse/CORE-5457
             Project: Firebird Core
          Issue Type: Bug
          Components: Engine
    Affects Versions: 3.0.1
         Environment: Windows
            Reporter: Holger Klemt


i have a reproducable bug in fb301 but at the moment i can only reproduce it 
using ibexpert
(but there is is easy to reproduce and results in the following log entry and 
all connections
are disconnected, also connections from isql which did not do anything in the 
mean time)

HKNB6    Mon Jan 16 17:38:54 2017
    Modifying procedure CALC_VAL which is currently in use by active user 
requests


HKNB6    Mon Jan 16 17:39:03 2017
    Database: C:\DB\BUG.FDB
    internal Firebird consistency check (invalid SEND request (167), file: 
JrdStatement.cpp line: 325)


i set the transaction setting in ibexpert as follows
isc_tpb_read_committed
isc_tpb_rec_version
isc_tpb_wait

attached database is used, but i can reproduce the error also on another very 
big database

1. step: open the table tbl in table editor and open data page
2. leave it open
3. change sourcecode of procedure calc_val (for example change the 
multiplication factor)
4. recompile procedure
5. go back to table tbl data page
6. commit transaction to refresh data
7. this error message will come

 internal Firebird consistency check (invalid SEND request (167), file: 
JrdStatement.cpp line: 325)

the calc_val procedure is used for computed by column


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