desktop: OpenCode.exe crashes on relaunch after close (0x80000003 during background-service startup) #50817

Summary

OpenCode desktop crashes on every relaunch after closing the window (X). First launch after reboot works; any later launch flashes and dies ~1s after logging starting v2 background service. Affects 2.0.12 and 2.0.14.

Environment

• opencode version: v2.0.14 (also reproduced on 2.0.12 before auto-update)
• OS: Microsoft Windows [Version 10.0.26200.9457] (win32 x64)
• Terminal: TERM=xterm-256color; TERM_PROGRAM/COLORTERM unset
• Shell: COMSPEC=C:\WINDOWS\system32\cmd.exe (diagnostics run via pwsh 7)
• Install/channel: desktop release, updater channel latest, packaged=true
• Active plugins: none (no plugin entries in config; custom local model provider configured, details omitted)

Reproduction

1. Launch OpenCode desktop (first launch after reboot works).
2. Close the window via the X button (no tray icon remains; no OpenCode.exe in Task Manager).
3. Launch OpenCode desktop again.
4. Window flashes, then the process exits. Windows logs Application Error 1000.

Expected Behavior

The app window reopens and reconnects to (or restarts) the background service.

Actual Behavior

The new process crashes ~1s after starting v2 background service, before background service ready, with no renderer.log. Windows Event Viewer, Application Error 1000:

• 2.0.14.0: Faulting module OpenCode.exe, Exception 0x80000003, Fault offset 0x735ae59 (11:28:38, 11:28:20, 11:28:09, 11:09:35, 11:03:52, 11:00:12, 10:56:22, 10:53:43, 10:48:18, ...)
• 2.0.12.0: Exception 0x80000003, Fault offset 0x6e90e29 (10:27:01, 10:24:50, 10:24:12, ...)

Failing launch main.log tail (20260923T030934):

[info] (main) main window visible {...}
[info] (main) updater state changed { from: 'idle', to: 'checking' }
[info] (main) Checking for update
[info] (main) starting v2 background service
<process crashes here; no `background service ready`, no renderer.log>

Successful launch (20260923T031524) continues past this point: update check -> up-to-date -> v2 CLI background service starting { reason: 'missing' } -> ready { url: 'http://127.0.0.1:49374' }.

Update: 3 more crashes at 11:28:09/20/38 reached v2 CLI background service ready { probed: true, url: 'http://127.0.0.1:49374' } before crashing, so the crash is after connecting to the background service in that path too.

Additional Context

• Frequency: consistent; ~8 failed launches in ~22 min, plus failures yesterday evening.
• Recent change: auto-update 2.0.12 -> 2.0.14 (differential download fell back to full download); crash signature persists across both versions at different offsets.
• Ruled out: stale zombie processes (none in Task Manager after close), off-screen window (window-state x:200 y:74 within 1536x960), crash dumps (Crashpad/reports has no new dumps; only Event 1000).
• server opencode.log shows only benign worktree discovery failed (DirectoryUnavailableError) for a non-git directory and one models.opencode.ai ENOTFOUND.
• Workaround: rebooting works. Killing processes does not apply (none remain). service restart + service status via staged CLI did not help.