Issues

• writing schema <Missing arg #1 - possibly status vector overflow> on gbak (Firebird 6.0)

  FirebirdSQL/firebird#9229 · Filter by author virgonia opened on Oct 21, 2026

• gbak: value-taking switch without a value placed before -se causes endless recursion of the embedded service manager (thousands of threads)

  FirebirdSQL/firebird#9228 · Filter by author tomaszdubiel18 opened on Oct 21, 2026

• Transaction started with SNAPSHOT AT NUMBER sees changes committed after that snapshot; parallel gbak backup is inconsistent (FK violation on restore)

  FirebirdSQL/firebird#9227 · Filter by author tomaszdubiel18 opened on Oct 21, 2026
  

• Optimize the Window Functions Execution Mechanism

  component: enginetype: improvement
  FirebirdSQL/firebird#9226 · Filter by author asfernandes opened on Oct 21, 2026
  

• Reduce Profiler overhead

  component: profilertype: improvement
  FirebirdSQL/firebird#9225 · Filter by author asfernandes opened on Oct 21, 2026
  

• Regression in FB 6.0: Output message items using plain blr_text/blr_varying fail with string right truncation or malformed string on NONE/OCTETS columns over multi-byte connection charsets

  FirebirdSQL/firebird#9222 · Filter by author mariuz opened on Oct 20, 2026

• Failed COMMIT followed by ROLLBACK causes TPC bugcheck "Attempt to mark inactive transaction to be dead" (5.0.4)

  FirebirdSQL/firebird#9218 · Filter by author GilShoshan94 opened on Oct 18, 2026

• Firebird Client Deadlock

  FirebirdSQL/firebird#9214 · Filter by author slalom91 opened on Oct 13, 2026
  1

• Transaction-scoped time zone

  FirebirdSQL/firebird#9208 · Filter by author arkinform opened on Oct 9, 2026
  1

  

• Allow selecting compression library and compression level in gbak -ZIP

  rdbtype: improvement
  FirebirdSQL/firebird#9207 · Filter by author balger opened on Oct 8, 2026
  3

• Named parameters

  component: enginetype: new feature
  FirebirdSQL/firebird#9204 · Filter by author asfernandes opened on Oct 7, 2026
  2

  

• Hash join uses only the index-matched equality as the hash key; the other join equalities become a post-filter, leading to quadratic probing (5.0, 6.0)

  FirebirdSQL/firebird#9190 · Filter by author tomaszdubiel18 opened on Oct 4, 2026
  1

  

• Background garbage collector keeps working on a dropped table: bugcheck 259 "bad pointer page" after DROP TABLE + CREATE TABLE, then the server hangs on a page latch left by the GC thread (3.0.14, 4.0.7, 5.0.5)

  FirebirdSQL/firebird#9189 · Filter by author tomaszdubiel18 opened on Oct 4, 2026
  3

  

• Nested loop join: Bitmap And with an open-ended range scan re-walks the whole range for every outer row (exposed by OuterJoinConversion in 5.0 / 6.0)

  FirebirdSQL/firebird#9188 · Filter by author tomaszdubiel18 opened on Oct 4, 2026

• gbak -c stdin must not request next backup file

  FirebirdSQL/firebird#9187 · Filter by author basid-irk opened on Oct 4, 2026
  3

• Regressions in FB 5.x when OuterJoinConversion = true (found by SQLancer with TLP-verification)

  FirebirdSQL/firebird#9183 · Filter by author pavel-zotov opened on Oct 2, 2026
  2

  

• isc_put_slice stores every second VARCHAR array element without character set conversion

  FirebirdSQL/firebird#9180 · Filter by author madorin opened on Oct 2, 2026
  1

• Incorrect filling of MON$COMPILED_STATEMENTS

  FirebirdSQL/firebird#9172 · Filter by author AlexBekhtin opened on Sep 29, 2026
  8

• Windows: no OS read-ahead for the engine's sequential page reads since 4.0 (FILE_FLAG_OVERLAPPED); with a cold cache gfix -v runs 3-9x and gbak 1.4-2.5x slower than on 3.0

  FirebirdSQL/firebird#9170 · Filter by author fdcastel opened on Sep 28, 2026
  2

• SuperServer: no attachment to ANY database can proceed while two or more attachments wait for a database under exclusive validation

  affect-version: 3.0.0affect-version: 4.0.0affect-version: 5.0 Initialfix-version: 3.0.15fix-version: 4.0.8fix-version: 5.0.5type: bug
  Bug

  FirebirdSQL/firebird#9169 · Filter by author fdcastel opened on Sep 28, 2026
  6

  

• FB 3.x hangs when user trace session, 'CREATE DATABASE' and 'fbsvcmgr info_svr_db_info' are used at the same time

  FirebirdSQL/firebird#9168 · Filter by author pavel-zotov opened on Sep 25, 2026

• It is impossible to read the value from the SEARCH_PATH context variable if it exceeds 255 characters.

  FirebirdSQL/firebird#9167 · Filter by author AlexBekhtin opened on Sep 25, 2026
  1

• Expression index on a computed column is not usable in other attachments and gets corrupted ("missing entries") when the table has a computed column calling a procedure that reads the same table

  FirebirdSQL/firebird#9165 · Filter by author tomaszdubiel18 opened on Sep 24, 2026
  10

• "Too many concurrent executions of the same request" raises when MaxStatementCacheSize > 0 and connection has lot of prepared statements.

  FirebirdSQL/firebird#9159 · Filter by author pavel-zotov opened on Sep 22, 2026
  1

• Incorrect result HASH SEMI JOIN with UUID key

  affect-version: 5.0.0affect-version: 5.0.1affect-version: 5.0.2affect-version: 5.0.3affect-version: 5.0.4fix-version: 5.0.5type: bug
  Bug

  FirebirdSQL/firebird#9158 · Filter by author sim1984 opened on Sep 19, 2026
  5