[Bug] Desktop v1.24.1 crashes on every startup and resets desktop-tabs.json (all session tabs disappear)

[missyou2013]

Summary / 摘要

Reasonix Desktop v1.24.1 (Windows) crashes once on every startup. The crash-repair flow then rewrites
%APPDATA%/reasonix/desktop-tabs.json to keep only the active tab, so all session tabs across all projects
disappear from the sidebar. Session data files are NOT lost — only the tab index is reset.

Environment

• Product: Reasonix Desktop (Windows)
• Version: v1.24.1 (installed via auto-update on 2026-08-12, D:/Reasonix/versions/v1.24.1)
• Code line: Go rewrite (v2 on main-v2 branch)
• OS: Windows 11 Home (10.0.22631.0, x86_64, 16 GB RAM)
• Currently downgraded to v1.22.0 as a temporary workaround

Reproduction

1. Upgrade from v1.22.0 to v1.24.1.
2. Fully quit the desktop app (including tray icon) and relaunch.
3. Observe:
   • %APPDATA%/reasonix/crash-fatal/<pid>.log is created as an empty file (crash marker).
   • desktop-tabs.json is reset to only 1 tab (only activeTab remains).
4. Sidebar shows only the current session; all other sessions (7 projects / 29 sessions, incl. legacy desktop-*.jsonl sessions) disappear.

Crash timeline (2026-08-12, local time)

Time	Event
15:00	Upgraded to v1.24.1
16:13	Crash, PID 8664 -> crash-fatal/8664.log
16:15	desktop-tabs.json reset to 1 tab (after running restore_tabs.py)
16:23	Crash, PID 16204 -> crash-fatal/16204.log
16:24	desktop-projects.json / desktop-tabs.json rewritten, tabs reset
17:06	Crash, PID 13524 -> crash-fatal/13524.log
17:52	After downgrade to v1.22.0: desktop-tabs.json reset again 33s after startup
08-14 09:26	Reproduced again on v1.22.0: crash-fatal/2948.log created, desktop-tabs.json reset to 1 tab (repair/config.toml.last-known-good.json records version=v1.22.0)

Impact

• 29 session tabs across 7 projects disappear from the sidebar (pda_an_2020, Erp_App, PDA_2022_HangZhou,
  PDA_2025_ShanDong, HuanBao_jiangsu_2_3, PDA_2020_WenZhou_38900, my_data).
• Session data is intact: sessions/*.jsonl, *.jsonl.meta, *.display-index.json,
  desktop-projects.json topics, and %LOCALAPPDATA%/reasonix/history-search/v1.sqlite are all preserved.

Root-cause observations

1. crash-fatal/<pid>.log is an empty file — no stack trace / details available for users to diagnose.
2. The repair flow rewrites desktop-tabs.json to only the active tab, overwriting the full tab list.
3. While the desktop app is running, it continuously persists its in-memory tab state to desktop-tabs.json,
   so any write to that file while the app is running is overwritten.
4. Rebuilding the 29 tabs (with the app fully quit) works and they display correctly, but the next
   startup crash-repair resets them again.
5. Cross-version: the "reset tabs after startup" behaviour also reproduces on v1.22.0 (2026-08-14 09:26),
   so the trigger is not on a v1.24.1-only code path. v1.24.1 crashes on every startup; v1.22.0 triggers
   occasionally (8/12 and 8/14).

Requested fixes

1. Fix the v1.24.1 startup crash (every startup crashes once). Please also provide a way to collect
   crash details/stacks — the current crash-fatal logs are empty.
2. Do not reset the tab list on crash repair: the repair flow should keep the full tabs array in
   desktop-tabs.json instead of reducing it to only activeTab. Please also investigate the shared
   startup logic that triggers repair/tab-reset (reproduced on v1.22.0 too).
3. Write real crash details into crash-fatal/<pid>.log (currently empty).

Temporary workaround (applied)

1. Downgraded to v1.22.0 by editing D:/Reasonix/current.json -> activeVersion: v1.22.0.
2. Restore script restore_all_tabs.py: rebuilds desktop-tabs.json (29 tabs) from
   desktop-projects.json + session metadata while the desktop app is fully quit.

Diagnostics (reasonix doctor --json)

{
 "version": "v1.22.0",
 "os": "windows",
 "arch": "amd64",
 "cwd": "D:\\reasonix_projects\\my_data",
 "config": {
  "source_path": "reasonix.toml",
  "user_path": "~\\AppData\\Roaming\\reasonix\\config.toml",
  "default_model": "deepseek/deepseek-v4-flash"
 },
 "providers": [
  {
   "name": "deepseek-flash",
   "kind": "anthropic",
   "base_url_host": "api.deepseek.com",
   "model": "deepseek-v4-flash",
   "models": [
    "deepseek-v4-flash"
   ],
   "api_key_env": "DEEPSEEK_API_KEY",
   "key_present": true,
   "is_default": false,
   "context_window": 1000000
  },
  {
   "name": "deepseek-pro",
   "kind": "anthropic",
   "base_url_host": "api.deepseek.com",
   "model": "deepseek-v4-pro",
   "models": [
    "deepseek-v4-pro"
   ],
   "api_key_env": "DEEPSEEK_API_KEY",
   "key_present": true,
   "is_default": false,
   "context_window": 1000000
  },
  {
   "name": "deepseek",
   "kind": "openai",
   "base_url_host": "api.deepseek.com",
   "models": [
    "deepseek-v4-flash",
    "deepseek-v4-pro"
   ],
   "api_key_env": "DEEPSEEK_API_KEY",
   "key_present": true,
   "is_default": false,
   "context_window": 1000000
  }
 ],
 "plugins": [
  {
   "name": "codegraph",
   "transport": "stdio",
   "auto_start": true,
   "target": "codegraph"
  }
 ],
 "lsp": {
  "enabled": true,
  "servers": 0
 },
 "sessions": {
  "dir": "~\\AppData\\Roaming\\reasonix\\sessions",
  "count": 0,
  "bytes": 0
 },
 "sandbox": {
  "bash": "off",
  "network": true,
  "write_roots": [
   "D:\\reasonix_projects\\my_data"
  ],
  "available": false,
  "shell": "bash (C:\\Program Files\\Git\\usr\\bin\\bash.exe)"
 },
 "network": {
  "proxy_mode": "auto",
  "proxy": "auto (env)",
  "no_proxy": false
 },
 "permission": {
  "mode": "ask",
  "allow_rules": 17,
  "ask_rules": 0,
  "deny_rules": 0
 },
 "warnings": [
  "skill \"review\" allowed-tools references \"use_capability\" which is not in the current registry",
  "skill \"security-review\" allowed-tools references \"use_capability\" which is not in the current registry"
 ]
}