Submitted by: @pavel-zotov

Attachments:
core_isql.zip

Preface:
ISQL Version: LI-V2.5.2.26448 Firebird 2.5
Server version:
Firebird/linux AMD64 (access method), version "LI-V2.5.2.26448 Firebird 2.5"
on disk structure version 11.2

Test #⁠1.

bash-3.2$ isql
Use CONNECT or CREATE DATABASE to specify a database
SQL> create database 'tm.fdb'; commit;
SQL> create table tm(c01 varchar(1024) primary key);
Statement failed, SQLSTATE = 42000
unsuccessful metadata update
-key size exceeds implementation restriction for index "RDB$PRIMARY1"

SQL> rollback; -- <<<<<<<<<<<<<<<<<<<<<<<< NB <<<<<<<<<<<<<<<<<<<

SQL> quit;

bash-3.2$ isql tm.fdb;
Database: tm.fdb
SQL> show table;
There are no tables in this database
SQL> show index;
There are no indices in this database
SQL> create table tm(c01 varchar(512) primary key);
Statement failed, SQLSTATE = 42000
unsuccessful metadata update
-cannot create index RDB$PRIMARY2

Why table `tm` can not be created ?

Test #⁠2

SQL> create database 'tm.fdb'; commit;
SQL> create table tm(c01 varchar(1024) primary key);
Statement failed, SQLSTATE = 42000
unsuccessful metadata update
-key size exceeds implementation restriction for index "RDB$PRIMARY1"

SQL> rollback; -- <<<<<<<<<<<< NB <<<<<<<<<<<<<<

SQL> create table tm(c01 varchar(512) primary key);
SQL> commit;
SQL> create table td(c01 varchar(512) references tm);
Statement failed, SQLSTATE = 08001
I/O error during "read" operation for file "/var/db/firebird/tm.fdb"
-Error while trying to read from file
-Invalid argument
SQL> show database;
Statement failed, SQLSTATE = XX000
internal Firebird consistency check (can't continue after bugcheck)
SQL> quit;

After change setting of Bugcheckabort to 1 I've got coredump and made stacktrace - see attach.