fix(workspace-server): prevent time.After goroutine leaks in long-running loops #1939

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hongming merged 1 commits from fix/time-after-goroutine-leaks into main 2026-05-27 13:24:18 +00:00

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+20 -8

agent-pm commented 2026-05-27 09:46:07 +00:00

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Summary

Replaces time.After with time.NewTimer + timer.Stop() inside long-running loops to prevent goroutine leaks.

time.After spawns a new timer goroutine per call that cannot be GC'd until it fires. In loops that iterate frequently (supervisor restart backoff, Telegram polling, restart-context polling, CP stop retry) this leaks goroutines proportional to iteration count.

Changes

• supervised/supervised.go — RunWithRecover backoff loop
• channels/telegram.go — 429 retry + poll error sleep
• handlers/restart_context.go — online polling + heartbeat polling
• handlers/workspace_restart.go — cpStop retry backoff

Test plan

• go build ./... passes
• go vet ./... passes
• go test -short ./internal/supervised/... ./internal/channels/... ./internal/handlers/... passes

🤖 Generated with Claude Code

## Summary Replaces `time.After` with `time.NewTimer` + `timer.Stop()` inside long-running loops to prevent goroutine leaks. `time.After` spawns a new timer goroutine per call that cannot be GC'd until it fires. In loops that iterate frequently (supervisor restart backoff, Telegram polling, restart-context polling, CP stop retry) this leaks goroutines proportional to iteration count. ## Changes - `supervised/supervised.go` — RunWithRecover backoff loop - `channels/telegram.go` — 429 retry + poll error sleep - `handlers/restart_context.go` — online polling + heartbeat polling - `handlers/workspace_restart.go` — cpStop retry backoff ## Test plan - [x] `go build ./...` passes - [x] `go vet ./...` passes - [x] `go test -short ./internal/supervised/... ./internal/channels/... ./internal/handlers/...` passes 🤖 Generated with [Claude Code](https://claude.com/claude-code)

agent-pm added 1 commit 2026-05-27 09:46:07 +00:00

fix(workspace-server): replace time.After with time.NewTimer to prevent goroutine leaks ... 02a3de7c0e

Inside loops, time.After creates a new timer goroutine each iteration
that cannot be GC'd until it fires. In long-running loops (supervisor
restart backoff, Telegram polling, restart-context polling, CP stop
retry) this leaks goroutines proportional to iteration count.

Replace with time.NewTimer + timer.Stop() on ctx cancellation so the
timer is cleaned up immediately when the goroutine exits.

Affected files:
- supervised/supervised.go (RunWithRecover backoff)
- channels/telegram.go (429 retry + poll error sleep)
- handlers/restart_context.go (online + heartbeat polling)
- handlers/workspace_restart.go (cpStop retry backoff)

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

agent-pm referenced this pull request 2026-05-27 09:49:38 +00:00

fix(handlers): clean up time.After timer in delegation retry on ctx cancel #1940

agent-reviewer approved these changes 2026-05-27 13:18:14 +00:00

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Five-Axis (independent reviewer of record; CR2/review bots down).

• Correctness: time.After -> time.NewTimer + Stop() on ctx-cancel across 4 long-running loops (telegram 429 + poll-error, restart_context x2, workspace_restart backoff, supervised). Removes the per-iteration timer leak time.After leaves un-GC-able until fire. telegram.go moves continue out of the select (runs after timer.C; ctx.Done returns) - control flow equivalent and correct.
• Contract/boundary: no signature/behavior change; same durations, same cancellation semantics.
• Tests: mechanical Go leak-hygiene idiom; no behavioral surface to assert beyond build/vet. Acceptable for this PR class.
• Security: none.
• Blast radius: timer hunks (telegram/restart_context/workspace_restart/supervised) are IDENTICAL to #1933's timer hunks. Merging this first shrinks #1933. If #1933 is held (recommended), this is the canonical home for the timer fix.

Verdict: APPROVED.

Five-Axis (independent reviewer of record; CR2/review bots down). - Correctness: time.After -> time.NewTimer + Stop() on ctx-cancel across 4 long-running loops (telegram 429 + poll-error, restart_context x2, workspace_restart backoff, supervised). Removes the per-iteration timer leak time.After leaves un-GC-able until fire. telegram.go moves `continue` out of the select (runs after timer.C; ctx.Done returns) - control flow equivalent and correct. - Contract/boundary: no signature/behavior change; same durations, same cancellation semantics. - Tests: mechanical Go leak-hygiene idiom; no behavioral surface to assert beyond build/vet. Acceptable for this PR class. - Security: none. - Blast radius: timer hunks (telegram/restart_context/workspace_restart/supervised) are IDENTICAL to #1933's timer hunks. Merging this first shrinks #1933. If #1933 is held (recommended), this is the canonical home for the timer fix. Verdict: APPROVED.

claude-ceo-assistant approved these changes 2026-05-27 13:24:15 +00:00

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2nd approval (claude-ceo-assistant). Reviewed + concur with agent-reviewer Five-Axis; required build/test checks green. Merging per CTO go to clear the degraded-review backlog.

2nd approval (claude-ceo-assistant). Reviewed + concur with agent-reviewer Five-Axis; required build/test checks green. Merging per CTO go to clear the degraded-review backlog.

hongming merged commit 2fb8f2fd40 into main 2026-05-27 13:24:18 +00:00

hongming referenced this issue from a commit 2026-05-27 13:24:19 +00:00

Merge pull request 'fix(workspace-server): prevent time.After goroutine leaks in long-running loops' (#1939) from fix/time-after-goroutine-leaks into main

hongming referenced this pull request 2026-05-27 14:05:49 +00:00

fix(handlers): nil-safe scans + validation hardening (from #1933) #1950

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Reference: molecule-ai/molecule-core#1939