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Type: Improvement
Resolution: Fixed
Priority: Minor - P4
Fix Version/s: 8.3.0-rc0
Affects Version/s: 7.0.0, 8.0.0, 8.3.0-rc0, 8.2.0
Component/s: None
Labels:
None

Assigned Teams:

Catalog and Routing
Backwards Compatibility:
Fully Compatible
Sprint:
CAR Team 2026-02-02, CAR Team 2026-02-16, CAR Team 2026-03-02
Story Points:
1
CAR Domain/s:

🟩 Routing and Topology

Aha! Reference:
None
Tracking Level:
None
Risk Status:
None
Exec Notes:
None
Goal Name(s):
None
Goal Link:
None

Currently checking a FCV-gated feature flag under undefined FCV using FCVGatedFeatureFlag::isEnabled causes the Server to crash (invariant).

We could make this a tripwire assert instead of an invariant, since generally it's safe to abort the operation.

(The way the invariant happens is that FCVGatedFeatureFlag::isEnabled calls FCVSnapshot::getVersion, which contains the invariant.)

is caused by

SERVER-82246 Change isEnabled to invariant when FCV is uninitialized and audit feature flags

Closed

related to

SERVER-119681 Rename kUnsetDefaultLastLTSBehavior FCV constant to kUninitialized

Needs Scheduling

Assignee:: Marco Bizzarri
Reporter:: Joan Bruguera Micó
Participants:: Githook User, Joan Bruguera Micó, Marco Bizzarri
Votes:: 0 Vote for this issue
Watchers:: 2 Start watching this issue

Created:: Dec 22 2025 11:52:46 AM UTC
Updated:: Feb 18 2026 03:24:07 PM UTC
Resolved:: Feb 18 2026 03:24:07 PM UTC