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cmux-tui: abort detached local forward task on drop - #10982
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📝 WalkthroughWalkthrough
ChangesLocal port forward cleanup
Estimated code review effort: 4 (Complex) | ~45 minutes Merge Risk: 🔵 Low · up to The change prevents detached forwarding work from outliving its owner, but the regression test may not independently prove that emergency cancellation works because later shutdown repeats the cleanup. The PR is mergeable with owner awareness and a follow-up to make that assertion specific. 🚥 Pre-merge checks | ✅ 23 | ❌ 2❌ Failed checks (2 warnings)
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Actionable comments posted: 1
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Inline comments:
In `@cmux-tui/crates/cmux-remote/src/bridge.rs`:
- Around line 1017-1027: Synchronize the spawned task’s startup before invoking
ForwardConnections::abort_all: add a Tokio oneshot channel, have the task signal
after constructing DropFlag, await that signal, then abort the connections.
Preserve the existing pending future and dropped-flag assertion behavior.
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Inline comments:
In `@cmux-tui/crates/cmux-remote/src/bridge.rs`:
- Around line 1019-1027: Update the test around the spawned handler and DropFlag
to await the dropped signal with a bounded timeout immediately after
connections.abort_all(), asserting the handler was dropped before calling
connections.shutdown(). Retain shutdown() afterward for cleanup and preserve the
existing started signal setup.
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| let (started_tx, started_rx) = oneshot::channel(); | ||
| connections.tasks.lock().await.spawn({ | ||
| let dropped = dropped.clone(); | ||
| async move { | ||
| let _flag = DropFlag(dropped); | ||
| let _ = started_tx.send(()); | ||
| std::future::pending::<()>().await; | ||
| } | ||
| }); |
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🎯 Functional Correctness | 🟡 Minor | ⚡ Quick win
Assert the handler is dropped before shutdown().
connections.shutdown().await calls tasks.abort_all() again and waits for every task. The assertion at Line 1032 can therefore pass even if the preceding connections.abort_all() does nothing. Wait for dropped with a bounded timeout immediately after connections.abort_all(), then call shutdown() for cleanup.
Proposed test adjustment
started_rx.await.unwrap();
connections.abort_all();
+ tokio::time::timeout(std::time::Duration::from_secs(1), async {
+ while !dropped.load(Ordering::Acquire) {
+ tokio::task::yield_now().await;
+ }
+ })
+ .await
+ .expect("abort_all did not drop the handler");
connections.shutdown().await;
assert!(dropped.load(Ordering::Acquire));🤖 Prompt for AI Agents
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In `@cmux-tui/crates/cmux-remote/src/bridge.rs` around lines 1019 - 1027, Update
the test around the spawned handler and DropFlag to await the dropped signal
with a bounded timeout immediately after connections.abort_all(), asserting the
handler was dropped before calling connections.shutdown(). Retain shutdown()
afterward for cleanup and preserve the existing started signal setup.
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2b61eca fix(relay): disarm process guard after wait (manaflow-ai#10985) 642a65b cmux-tui: abort detached local forward task on drop (manaflow-ai#10982)
1 participant
LocalPortForward::drop sent shutdown to its accept-loop task, then dropped the JoinHandle. Tokio documents that dropping a JoinHandle detaches the task, so the listener and in-flight tunnel tasks could outlive the owning forward until the runtime happened to poll shutdown.
Abort the task handle during Drop after signaling shutdown. The explicit async shutdown path still sends shutdown and awaits the task. This keeps Drop synchronous and prevents detached forwarding work from retaining sockets after ownership ends.
Checks: rustfmt --edition 2024 --check cmux-tui/crates/cmux-remote/src/bridge.rs; git diff --check. Hosted cmux-tui tests were not run locally per repository instructions.
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@codesmith-botwith what you need. Autofix is disabled.Summary by cubic
Fixes a resource leak in
LocalPortForwardwhere dropping the forward detached the accept-loop task, leaving the listener and in-flight tunnel handlers running until the runtime polled shutdown.Dropnow aborts the accept loop and any tracked tunnel tasks, so cleanup stays synchronous and sockets don't outlive ownership.ForwardConnectionsJoinSetthat both the accept loop andDropcoordinate on.Dropstays synchronous while still interrupting active tunnels.shutdownpath sends the same cancellation signal and awaits all tasks.Written for commit 1e0c3ee. Summary will update on new commits.
Summary by CodeRabbit