Canton 2.8.10

Canton 2.8.10 has been released on September 16, 2024. You can download the Daml Open Source edition from the Daml Connect Github Release Section. The Enterprise edition is available on Artifactory. Please also consult the full documentation of this release.

Summary

This is a maintenance release that fixes a critical bug for retroactive interfaces.

Bugfixes

(24-020, Critical): Participant crashes due to retroactive interface validation

Description

The view reinterpretation of an exercise of a retroactive interface may fail because the engine does not explicitly request the interface package. This can lead to a ledger fork as participants come to different conclusions.

Affected Deployments

Participant

Affected Versions

2.5, 2.6, 2.7, 2.8.0-2.8.9

Impact

A participant crashes during transaction validation when using retroactive interfaces.

Symptom

Validating participant emits warning:

LOCAL_VERDICT_FAILED_MODEL_CONFORMANCE_CHECK(5,571d2e8a): Rejected transaction due to a failed model conformance check: DAMLeError(
  Preprocessing(
    Lookup(
      NotFound(
        Package(

And then emits an error:

An internal error has occurred.
java.lang.IllegalStateException: Mediator approved a request that we have locally rejected

Workaround

None

Likeliness

Very likely for all multi participant setups that uses retroactive interface instances.

Recommendation

Upgrade to 2.8.10

Compatibility

The following Canton protocol versions are supported:

Dependency	Version
Canton protocol versions	3, 4, 5

Canton has been tested against the following versions of its dependencies:

Dependency	Version
Java Runtime	OpenJDK 64-Bit Server VM Zulu11.70+15-CA (build 11.0.22+7-LTS, mixed mode)
Postgres	Recommended: PostgreSQL 12.20 (Debian 12.20-1.pgdg120+1) – Also tested: PostgreSQL 11.16 (Debian 11.16-1.pgdg90+1), PostgreSQL 13.16 (Debian 13.16-1.pgdg120+1), PostgreSQL 14.13 (Debian 14.13-1.pgdg120+1), PostgreSQL 15.8 (Debian 15.8-1.pgdg120+1)
Oracle	19.20.0