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UserIdentityCache holds a NodeTypeDefinition where a User is expected — As<User> fails #2160
Description
What is failing
MeshWeaver.Blazor.Infrastructure.UserIdentityCache.As<User>() observed a cached identity that is not a User at all — it is a MeshWeaver.Graph.Configuration.NodeTypeDefinition (from MeshWeaver.Graph). The cache path took the failure branch and logged at fail: level; the calling circuit almost certainly then saw a null/absent user for that request.
Probable cause
Medium confidence on the diagnosis, low on root cause. The log message itself is unambiguous — the object stored in the user-identity slot is of the wrong type — but the incident does not pin down how it got there. Three shapes are plausible:
- A cache-key collision:
UserIdentityCacheshares storage (or a key namespace) with something that legitimately cachesNodeTypeDefinitioninstances, and a user id collides with a node-type id. - A mis-typed write: some code path calls the cache's setter with a
NodeTypeDefinitionwhere it should pass aUser— likely via anobject/generic overload that skipped a compile-time check. - An identity-provider mis-registration where the "current user" for that circuit resolves to a graph node-type definition rather than a user principal.
The captured "stack" in the sample is not useful — it is a truncated, repeating StreamConfiguration<T>.GetHashCode() / SynchronizationStream<T>.GetHashCode() / ObjectEqualityComparer<T>.GetHashCode() loop with no application frames above it. That is almost certainly a sampler artifact from a hash lookup on the way in to the cache, not the call site that produced the log. Treat topFrame here as noise; the message is the signal.
Impact
Low so far — one occurrence, one pod, one moment. This is a logged failure inside a cache lookup, not an unhandled exception, so the process stays up; the affected circuit just does not get a User back and downstream code sees a null identity. Worth fixing on defect grounds (silently missing identity is a real UX/authorization bug) but not an outage.
Where to look
MeshWeaver.Blazor.Infrastructure.UserIdentityCache, specifically theAs<TUser>()method that emits this message, and whichever setter / add path populates the user slot. That is the one place that knows what type the value should be and what the key looked like.- If the same cache instance (or dictionary) is used to hold anything from
MeshWeaver.Graph.Configuration(e.g.NodeTypeDefinitionlookups) — check the key scheme for collisions. - Log the offending key alongside the value type on that
fail:branch so the next occurrence tells us which identity collided, not just the type of the stray object.
Evidence
| Fingerprint | 6e643370636ed34a |
| Category | MeshWeaver.Blazor.Infrastructure.UserIdentityCache |
| Severity | Error |
| Top frame | MeshWeaver.Data.Serialization.StreamConfiguration1[[System.__Canon, System.Private.CoreLib, Version=10.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].GetHashCode()` |
| Namespace | memex |
| Pods | memex-portal-deployment-7cfbf545d9-gtlhr |
| Occurrences | 2 |
| First seen | 2026-08-24 17:48:16Z |
| Last seen | 2026-08-24 17:48:16Z |
Recent log lines
2026-08-24 17:48:16Z memex-portal-deployment-7cfbf545d9-gtlhr fail: MeshWeaver.Blazor.Infrastructure.UserIdentityCache[0]
As<User> for User: value is MeshWeaver.Graph.Configuration.NodeTypeDefinition (MeshWeaver.Graph), not convertible
at System.Collections.Generic.ObjectEqualityComparer`1[[System.__Canon, System.Private.CoreLib, Version=10.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].GetHashCode(System.__Canon)
at MeshWeaver.Data.Serialization.StreamConfiguration`1[[System.__Canon, System.Private.CoreLib, Version=10.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].GetHashCode()
at MeshWeaver.Data.Serialization.SynchronizationStream`1[[System.__Canon, System.Private.CoreLib, Version=10.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].GetHashCode()
at System.Collections.Generic.ObjectEqualityComparer`1[[System.__Canon, System.Private.CoreLib, Version=10.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].GetHashCode(System.__Canon)
at MeshWeaver.Data.Serialization.StreamConfiguration`1[[System.__Canon, System.Private.CoreLib, Version=10.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].GetHashCode()
at MeshWeaver.Data.Serialization.SynchronizationStream`1[[System.__Canon, System.Private.CoreLib, Version=10.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].GetHashCode()
at System.Collections.Generic.ObjectEqualityComparer`1[[System.__Canon, System.Private.CoreLib, Version=10.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].GetHashCode(System.__Canon)
at MeshWeaver.Data.Serialization.StreamConfiguration`1[[System.__Canon, System.Private.CoreLib, Version=10.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].GetHashCode()
at MeshWeaver.Data.Serialization.SynchronizationStream`1[[System.__Canon, System.Private.CoreLib, Version=10.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].GetHashCode()
at System.Collections.Generic.ObjectEqualityComparer`1[[System.__Canon, System.Private.CoreLib, Version=10.0.0.0, Culture=neutral, …[truncated]
2026-08-24 17:48:16Z memex-portal-deployment-7cfbf545d9-gtlhr fail: MeshWeaver.Blazor.Infrastructure.UserIdentityCache[0]
As<User> for User: value is MeshWeaver.Graph.Configuration.NodeTypeDefinition (MeshWeaver.Graph), not convertible
at System.Collections.Generic.ObjectEqualityComparer`1[[System.__Canon, System.Private.CoreLib, Version=10.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].GetHashCode(System.__Canon)
at MeshWeaver.Data.Serialization.StreamConfiguration`1[[System.__Canon, System.Private.CoreLib, Version=10.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].GetHashCode()
at MeshWeaver.Data.Serialization.SynchronizationStream`1[[System.__Canon, System.Private.CoreLib, Version=10.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].GetHashCode()
at System.Collections.Generic.ObjectEqualityComparer`1[[System.__Canon, System.Private.CoreLib, Version=10.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].GetHashCode(System.__Canon)
at MeshWeaver.Data.Serialization.StreamConfiguration`1[[System.__Canon, System.Private.CoreLib, Version=10.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].GetHashCode()
at MeshWeaver.Data.Serialization.SynchronizationStream`1[[System.__Canon, System.Private.CoreLib, Version=10.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].GetHashCode()
at System.Collections.Generic.ObjectEqualityComparer`1[[System.__Canon, System.Private.CoreLib, Version=10.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].GetHashCode(System.__Canon)
at MeshWeaver.Data.Serialization.StreamConfiguration`1[[System.__Canon, System.Private.CoreLib, Version=10.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].GetHashCode()
at MeshWeaver.Data.Serialization.SynchronizationStream`1[[System.__Canon, System.Private.CoreLib, Version=10.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].GetHashCode()
at System.Collections.Generic.ObjectEqualityComparer`1[[System.__Canon, System.Private.CoreLib, Version=10.0.0.0, Culture=neutral, …[truncated]
Opened automatically from Admin/_LogIncident/6e643370636ed34a. Recurrences are folded into this issue rather than opening new ones.
Activity
rbuergi commentedon Aug 25, 2026
Fixed by #2245 (merged): the
UserNodeType declaration carriednodeType: User, so the portal's user-directory query (UserIdentityCache,nodeType:User) returned the declaration alongside the real accounts and read itsNodeTypeDefinitioncontent as aUseron every index emission.The colliding key was the declaration's own
NodeTypefield — a declaration filed under the very type it declares is indistinguishable from an instance. Declarations now sayNodeType = MeshNode.NodeTypePath, matching Space/Release/Build. Same fix coversVUserandPartition.Nothing was ever cached wrongly and nothing re-populated:
UserIdentityCacheis a DI singleton with one subscription, andTryGetEmailrejects the row each time — the collision lived in the query result, not in the cache's storage, so the row simply reappeared in the next emission. Removing it from the result set makes the line impossible at any emission rate.Measured A/B over a full
MeshWeaver.Hosting.Monolith.Testassembly run, same host: clean main logs this line 3×, the fix logs it 0×.NodeTypeDeclarationSelfTypingTestratchets the invariant for every statically-registered declaration, present and future.Also kills item D of #2229 (left open — multi-part issue owned elsewhere).