3.6.4

Date: 2026-07-09 Tag: 3.6.4

Overview

Tarantool 3.x is the recommended release series. Users of Tarantool 2.11 are encouraged to update to the latest 3.x release.

This release resolves 19 bugs since 3.6.3.

Please consider the full list of user-visible changes below.

Compatibility

Tarantool 2.x and 3.x are compatible in the binary data layout, client-server protocol, and replication protocol. It means upgrade may be performed with zero downtime for read requests and the order-of-network-lag downtime for write requests.

Please follow the upgrade procedure to plan your update actions.

Users of Tarantool 2.x may be interested in the compat options that allow to imitate some 2.x behavior. This allows to perform application code update step-by-step, not all-at-once.

Bugs fixed

Core

• Fixed a heap-use-after-free bug when a space.before_replace trigger yielded with disabled MVCC (gh-12779).
• Fixed a stack overflow when checking MsgPack input with deeply nested values containing extension types (ghs-162).
• Fixed an issue where zero values were incorrectly rejected by fixed-point decimal fields when their scale was greater than or equal to their precision (gh-12808).

Memtx

• Fixed a bug in MVCC read-confirmed isolation where delete and update could see an incorrect tuple (gh-12260).

Replication

• Fixed a crash that could occur when a replication source was removed from box.cfg.replication at the same time as the node reached its maximum WAL queue size (configured by box.cfg.wal_queue_max_size) (gh-12719).
• Fixed a replica sending its master an outdated acknowledgement right after reconnecting, which made the replica's vclock progress appear to move backwards on the master in box.info.replication (gh-12795).
• Fixed a bug where replicas kept their old connection to the master and ignored changes to replication parameters (gh-12728).
• election_mode='off' has been reworked internally. A promoted off-mode node will now be reported as 'leader' in box.info.election.state. Additionally, such nodes are now able to vote for other nodes that may have different election modes (gh-8095).

LuaJIT

Backported patches from the vanilla LuaJIT trunk (gh-12480). The following issues were fixed as part of this activity:

• Fixed incorrect JIT behavior for vararg FFI functions on the macOS AArch64 platform (gh-6097).
• Fixed various FFI ABI and calling convention issues for x64/AArch64 architectures.
• Fixed ipairs_aux() to match JIT backend behavior on x86/x64.
• Fixed os.time() returning -1.
• Fixed UBSan warnings for table.new().

SQL

• Added permission checks when creating a trigger in SQL. Now only users with 'alter' privileges on a table can create triggers for that table (ghs-163).
• Fixed collisions of prepared statement IDs - now a new prepared statement will always be assigned a free ID (gh-12537).
• An error now occurs if a column appears more than once in a subquery of a SELECT statement (gh-12337).

Lua

Datetime

• Fixed parsing for time with a decimal fraction of hour or minute (gh-12082).
• Fixed a stack overflow strptime() function when parsing timezones (ghs-146).

Pickle

• Fixed abortion on calling pack() with an empty format string or a string value for the 'a' format specifier (gh-12063).