fix: multiple memory leaks in long-running sessions

Bug Description

Several memory leaks occur during long-running opencode sessions, causing RSS to grow continuously:

AsyncQueue never terminates (util/queue.ts) - [Symbol.asyncIterator] loops forever with no close mechanism, preventing GC of consumers.
Bash tool unbounded string concatenation (tool/bash.ts:167-189) - stdout/stderr appended via output += chunk.toString() with no size limit. Commands producing large output (e.g., find /) cause unbounded memory growth.
LSP diagnostics Map never cleared (lsp/client.ts:51) - diagnostics Map accumulates entries indefinitely. shutdown() disposes the connection but doesn't clear the map.
Bus subscriptions Map not cleared on dispose (bus/index.ts) - Instance dispose callback fires wildcard subscribers but never calls subscriptions.clear().
PTY buffer string concatenation (pty/index.ts:136-150) - session.buffer += data then session.buffer.slice(-BUFFER_LIMIT) causes repeated large string allocation and GC pressure.
Instance.disposeAll() not called on process exit (index.ts) - The main finally block calls process.exit() without disposing instances, leaking subprocess handles.

Reproduction

Start opencode, run a command producing large output (find / -name "*.ts")
Monitor with top -pid <PID> - RSS grows without bound
Idle for 10+ minutes - memory does not decrease

Environment

opencode v1.1.36
macOS Darwin 24.6.0
Bun 1.3.5

This issue might be a duplicate of existing issues. Please check:

Memory usage grows very quickly when running commands with large output #9699: Memory usage grows very quickly when running commands with large output - directly addresses the bash tool unbounded string concatenation issue you identified
Memory leak: LSP client diagnostics and files maps not cleared on shutdown #9143: Memory leak: LSP client diagnostics and files maps not cleared on shutdown - addresses the LSP diagnostics Map memory leak issue
Memory leak: Instance disposal doesn't clean up plugins or cached resources #9157: Memory leak: Instance disposal doesn't clean up plugins or cached resources - addresses the Instance.disposeAll() not being called issue
Memory Leak: Orphaned processes when terminal closes without explicit exit #10563: Memory Leak: Orphaned processes when terminal closes without explicit exit - related to subprocess handle leaks and process exit cleanup
Memory leak: Unbounded caches grow without limit #9140: Memory leak: Unbounded caches grow without limit - addresses the general unbounded cache growth pattern

Feel free to ignore if none of these address your specific case.

I believe I have encountered the same issue. Seems like the following PR #11717 and PR #10914 seems to be fixing the solution.

Looks like people haven't gotten a fix working for all the memory issues. Anyone see improvement with this? My opencode serve is killing my server multiple times per day requiring hard reboot.

fix: address 6 memory leaks for long-running sessions

Closing in favor of #20695 where we're collecting all memory-related problems. Please follow that issue for updates.

Navigation Menu

Repository navigation

fix: multiple memory leaks in long-running sessions #10913

Bug Description

Reproduction

Environment

Metadata

Assignees

Labels

Type

Projects

Milestone

Relationships

Development

fix: multiple memory leaks in long-running sessions #10913

Description

Bug Description

Reproduction

Environment

Activity

github-actions commented on Jan 27, 2026

KaranjotVendal commented on Feb 3, 2026

cdenneen commented on Feb 18, 2026

thdxr commented on Apr 2, 2026

Metadata

Metadata

Assignees

Labels

Type

Projects

Milestone

Relationships

Development

Issue actions