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Graph/async-context-teardown-race

Pattern

Async Context Teardown Race

async-context-teardown-race

Request-scoped async context (DB/session/logging state) gets torn down before background work completes, so changes are not persisted and metadata (e.g., contextvars) can be lost across threads or executor boundaries.

Node Details

Public graph metadata

Updated7/25/2026

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30 linked nodes

one failed write aborted the rest of the batch — structured post-turn extraction wrote events and beliefs without per-entry error isolation. Outcome: leaving future event inserts vulnerable once the initial partition window expired.

the cache doesn't work across processes — workers might be pre-forked. Tension: is using lru caching doing what I am expecting, that is - will it only initialize sentry once even though i attempt to do it multiple times? Outcome: provided it's called within the same process.

background task blocks eventloop — reload = True or workers > 1. Tension: I immediately get response in my browser and then background task blocks eventloop.

the background job never runs — my `BackgroundTasks` only execute when declared inside an async dependency. Tension: No exception is raised, the route returns normally. Outcome: If I move the `bg.add_task()` call into the route itself, it works as expected.

sqlite3.OperationalError: database is locked. — I trigger `/session_a` and `/session_b` almost simultaneously. Tension: session A reaching commit earlier than session B, but session B is already holding the write lock. Outcome: A will inevitably fail with a database is locked error.

the context variables get propagated correctly to the uvicorn access logger — if I use a custom middleware class without inheriting from `BaseHTTPMiddleware`. Tension: known starlette `BaseHTTPMiddleware` limitation of not propagating contextvars "upwards".

some events are asynchronous and not come from a frontend request.

it seems to stop processing after a while and nothing seems to be happening — when I start multiple tasks simultaneously with requests. Tension: it stops both background tasks, ultimately the cloud run container shuts down and database is also not populated.

the two requests are executed "in parallel." — If I make two requests — the first one to the sync endpoint and the second one to the async endpoint — almost at the same time. Tension: I expected the event loop to be blocked. Outcome: the two requests are executed "in parallel.".

Yes, it will be reset as soon as the current HTTP view is done. — in a FastAPI app, that is done by the framework + application server (asgi or uvicorn). Tension: what will happen to SqlAlchemy session that is set in ContextVar if not to reset it? Outcome: the co-routine `main` returns.

Waiting for background tasks to complete. — Whenever I gracefully shut down my FastAPI app by saving a file (with the `--reload` option). Tension: "Shutting down sessions" is never logged because it is waiting for all background tasks to be completed, which will never happen. Outcome: How am I supposed to close my sessions so that FastAPI can properly shut down?

Tension: From my research and own implementation I get mixed answers. Outcome: If I restart my app, I still can access the session data using the token.

the contextvars setted on the main thread does not propagate to "_monitor" thread of the QueueListener — parallelize logs with Queuehandler and Queuelistener in a fastapi application. Tension: And use in it in a Formatter on a logger file. Outcome: Can anyone help me to understand how can I resolve this?

runner context does not include any labels

parallel Wave-A subagents working in the same git checkout can clobber each other's work — refactoring four privacy-cleanup scripts to consume a central table registry. Outcome: The dedicated branch's commits were never lost, but uncommitted work was effectively orphaned.

`chronicle recall` (and the warm-context renderer used at session start / by retrieveMemoryContext) hard-excludes them via a WHERE clause — Chronicle 2.0 memory recall. Tension: fresh writes appear in `chronicle search --tier short-term` but never in `chronicle recall`. Outcome: newly-saved facts are invisible for at least 24 hours unless explicitly saved with `--tier long-term`.

Privacy pipeline spec changed from retaining encrypted raw text to default-discard, but existing schema and write paths still assumed raw retention and async-only LLM review

a read-looking endpoint (`GET /v2/packages`) enqueued a background job on a cache miss with no flag check. Tension: Any other caller of the same service bypassed the gate entirely. Outcome: An authenticated client could therefore drive arbitrary writes into production through the side door.

Tension: Did he leave by himself? Has its session ended and the system kicked it out? Outcome: Create a new middleware for session activity tracking.

Java daemon threads that require access to `ScopedValues` as they were bound at the time the daemon thread is created — for child threads to inherit `ScopedValues` it is required to use the `StructuredTaskScope` fork/join protocol. Tension: that protocol does not work for daemon threads because it is impossible to create a scope for them that never terminates. Outcome: the daemon thread can continue executing after main() ends and any scope created in main() will, by definition, be terminated.

Hard timeout cancels the client future, but successful requests show increased latency

Changes to a shared mutable object may never become visible to another thread

After enabling Spring Boot virtual threads, the application deadlocks under load. Thread dumps show virtual threads parked waiting for object monitors inside synchronized methods/blocks.

tasks keep running after the component or GameObject is destroyed — In s&box, async/await in Components. Tension: Using raw Task.Delay means tasks keep running after the component or GameObject is destroyed. Outcome: causing null reference exceptions and ghost behavior.

Common mistakes: (1) not calling RemovePlayer on disconnect causing memory leaks, (2) unbounded stack growth, (3) broadcasting undo notices to all players instead of just the owner, (4) not removing objects from undo stacks when they're picked up — Sandbox-style games need per-player undo stacks. Tension: allowing players to undo weapons out of other players' hands.

SESSION_HANDOFF.md only gets written at clean session end — crash/OOM/gateway restart. Tension: not during unexpected termination.

After truncation the agent loses earlier context and starts contradicting itself. — building an agent that needs to maintain coherent multi-turn conversations. Tension: keep hitting the context window limit (128k tokens on GPT-4o). Outcome: Naive sliding window (drops oldest turns).

accumulate conversation history indefinitely — OpenClaw Discord group sessions. Tension: no idle timeout or daily reset configured by default, causing context to grow unbounded and cost to compound over days/weeks.

the implementation still enqueued a sweep unconditionally for message and message-request writes — A TypeScript service documented that asynchronous privacy sweeps should only be queued when synchronous findings exist or a deferred-scan predicate matches. Tension: the implementation still enqueued a sweep unconditionally. Outcome: for message and message-request writes.

Daemon-witnessed triage counts (edge attrs.perContext) never reached the cloud count-merge, with zero errors anywhere. — Two independent layers each silently dropped the field. Tension: Either bug alone is invisible; together they doubly guaranteed the data loss. Outcome: with zero errors anywhere.

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