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[Bug] Windows desktop crashes: access violation on the UI thread (0.42.1) and heap corruption during a file-watch burst #1120

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[Bug] Windows desktop crashes: access violation on the UI thread (0.42.1) and heap corruption during a file-watch burst#1120

Description

@YHonc
YHonc
opened on Nov 10, 2026

Environment

  • codeg Desktop 0.42.1 (codeg.exe PE timestamp 0x6aee122b, 2026-11-06 17:45:15 UTC)
  • Windows 11 Home 10.0.22631 x64, WebView2 runtime installed
  • Agents: Claude Code (claude-acp 0.100.0), Codex (codex-acp 2.5.0); several concurrent sessions plus codeg-cli run dispatches and MCP delegations

Crash 1 — current build 0.42.1 (2026-11-08 14:43 UTC)

  • Windows Application log: event 1000 at 14:43:13, faulting module codeg.exe 0.42.1, exception 0xc0000005, offset 0x5824b47; at 14:43:18 a second event 1000 with 0xc000041d at the same offset.
  • Minidump: access violation writing 0x27f5ef38600 (exception params [0x1, 0x27f5ef38600]) at codeg.exe+0x5824b47.
  • Faulting thread is the first thread of the process (main/UI thread). A raw stack scan finds return addresses in user32.dll, comctl32.dll, win32u.dll, EmbeddedBrowserWebView.dll (38 hits) and codeg.exe, so the fault is in codeg code reached from window-message / WebView2 callback dispatch; 0xc000041d means the exception escaped a user callback.
  • Log context: two ACP sessions finished a turn and were disconnected at 14:42:17 and 14:42:43, while codeg-cli run dispatches were writing output files in the same workspace. Logging continues until 14:43:18.189; the app was restarted at 14:43:38.
  • Not reproducible on demand yet.

Crash 2 — older build (PE timestamp 0x6aea5268, 2026-11-03), 2026-11-07 12:13 UTC

  • Event 1000 at 12:13:21: faulting module ntdll.dll, exception 0xc0000374 (heap corruption), offset 0x10d1f9.
  • Faulting thread is a background thread (not the first thread); the stack is mostly ntdll.dll and codeg.exe.
  • Log context: about 14,480 notify::windows events between 12:13:08 and 12:13:14 (a dependency install under an open workspace's node_modules), after tens to hundreds per minute before. The log stops at 12:13:14.072 and the process dies 7 s later.
  • This build is older; reporting in case the watcher path is still involved in 0.42.1.

Possibly related: #1059 (UI hang under heavy terminal output).

Logs (redacted)

User paths, session/connection IDs and text content are replaced with placeholders; each line is time level target | message, messages truncated to 170 chars.

Crash 1 — 2026-11-08 14:42:00 → restart (UTC) 
14:42:01.031 INFO  codeg_lib::acp::connection | [ACP] permission <id-2> shown conn=<id-3> conv=75 (waiting=0)
14:42:01.031 INFO  codeg_lib::acp::connection | [ACP] permission <id-2> answered conn=<id-3> conv=75
14:42:02.498 TRACE notify::windows | Event: path = `\\?\<workspace-A>\<dir-2>\<file-36>`, action = 2
14:42:02.503 TRACE notify::windows | Event: path = `\\?\<workspace-A>\<dir-2>`, action = 3
14:42:02.506 TRACE notify::windows | Event: path = `\\?\<workspace-A>\<dir-2>`, action = 2
14:42:17.108 INFO  codeg_lib::acp::session_state | [ACP] turn_complete session=Some("<id-4>") stop_reason=end_turn background_outstanding=0
14:42:17.108 INFO  codeg_lib::acp::session_state | [ACP] status_changed session=Some("<id-4>") Connected -> Connected
14:42:17.114 INFO  codeg_lib::acp::manager | [ACP] disconnect connection=<id-3>
14:42:17.129 INFO  codeg_lib::acp::session_state | [ACP] status_changed session=Some("<id-4>") Connected -> Disconnected
14:42:17.131 TRACE notify::windows | Event: path = `\\?\<workspace-A>\<dir-3>\<file-37>`, action = 3
14:42:17.148 TRACE notify::windows | Event: path = `\\?\<workspace-A>\<dir-3>\<file-38>`, action = 3
14:42:17.234 TRACE notify::windows | Event: path = `\\?\<workspace-A>\<dir-3>\<file-39>`, action = 3
14:42:29.187 TRACE notify::windows | Event: path = `\\?\<workspace-A>\<dir-4>\<file-40>`, action = 1
14:42:29.188 TRACE notify::windows | Event: path = `\\?\<workspace-A>\<dir-4>\<file-40>`, action = 3
14:42:31.730 INFO  codeg_lib::acp::background_watch | [bg-watch] registered background shell task=<id-5>
14:42:31.730 INFO  codeg_lib::acp::background_watch | [bg-watch] surfacing connection=<id-6> turns=0 settled=0 outstanding=2 watermark=12122866
14:42:35.810 TRACE notify::windows | Event: path = `\\?\<workspace-A>\<dir-4>`, action = 3
14:42:43.424 INFO  codeg_lib::acp::session_state | [ACP] turn_complete session=Some("<id-7>") stop_reason=end_turn background_outstanding=0
14:42:43.424 INFO  codeg_lib::acp::session_state | [ACP] status_changed session=Some("<id-7>") Connected -> Connected
14:42:43.439 INFO  codeg_lib::acp::manager | [ACP] disconnect connection=<id-8>
14:42:43.459 TRACE notify::windows | Event: path = `\\?\<workspace-A>\<dir-3>\<file-41>`, action = 3
14:42:43.465 INFO  codeg_lib::acp::session_state | [ACP] status_changed session=Some("<id-7>") Connected -> Disconnected
14:42:43.521 TRACE notify::windows | Event: path = `\\?\<workspace-A>\<dir-3>\<file-42>`, action = 3
14:42:43.593 TRACE notify::windows | Event: path = `\\?\<workspace-A>\<dir-3>\<file-39>`, action = 3
14:43:10.896 TRACE notify::windows | Event: path = `\\?\<workspace-A>\<dir-4>\<file-43>`, action = 1
14:43:10.896 TRACE notify::windows | Event: path = `\\?\<workspace-A>\<dir-4>\<file-43>`, action = 3
14:43:18.189 TRACE notify::windows | Event: path = `\\?\<workspace-A>\<dir-4>`, action = 3
14:43:38.535 INFO  codeg_lib::paths | [paths] logs go to C:\Users\<user>\AppData\Roaming\app.codeg\logs
14:43:38.558 INFO  sea_orm_migration::migrator | Applying all pending migrations
14:43:38.559 INFO  sea_orm_migration::migrator | No pending migrations
14:43:38.570 INFO  codeg_lib::chat_channel::manager | [ChatChannel] command dispatcher started
14:43:38.585 INFO  codeg_lib::commands::generative_ui | [GenerativeUI] ui-render skill ready
14:43:38.585 INFO  codeg_lib::acp::delegation::listener | [delegation] listening on named pipe \\.\pipe\codeg-delegation-10416
14:43:38.590 INFO  codeg_lib::cli_run::listener | [cli] command-line access on <redacted>, published at C:\Users\<user>\AppData\Roaming\app.codeg\cli\endpoint-10416.json
Crash 2 — 2026-11-07 12:12:00 → 12:13:40 (UTC), first 40 of ~14,480 notify lines kept 
12:12:02.130 DEBUG codeg_lib::acp::connection | [ACP][Claude Code][stderr] Unexpected case: {"type":"system","subtype":"permission_check_status","tool_use_id":"<id-17>","status":"checking","uuid":"<id-15>","session_id"…
12:12:09.582 DEBUG codeg_lib::acp::connection | [ACP][Claude Code][stderr] Unexpected case: {"type":"system","subtype":"permission_check_status","tool_use_id":"<id-17>","status":"done","uuid":"<id-18>","session_id":"<i…
12:12:10.462 INFO  codeg_lib::acp::background_watch | [bg-watch] registered background shell task=<id-19>
12:12:10.464 INFO  codeg_lib::acp::background_watch | [bg-watch] surfacing connection=<id-20> turns=2 settled=0 outstanding=1 watermark=10473247
12:12:13.757 DEBUG codeg_lib::acp::connection | [ACP][Claude Code][stderr] Unexpected case: {"type":"system","subtype":"permission_check_status","tool_use_id":"<id-22>","status":"checking","uuid":"<id-21>","session_id"…
12:12:34.835 TRACE hyper_util::client::legacy::pool | idle interval checking for expired
12:12:37.258 DEBUG codeg_lib::acp::connection | [ACP][Claude Code][stderr] Unexpected case: {"type":"system","subtype":"permission_check_status","tool_use_id":"<id-22>","status":"done","uuid":"<id-23>","session_id":"<i…
12:12:37.758 INFO  codeg_lib::acp::background_watch | [bg-watch] surfacing connection=<id-20> turns=1 settled=0 outstanding=1 watermark=10478015
12:13:02.102 INFO  codeg_lib::acp::background_watch | [bg-watch] registered background shell task=<id-24>
12:13:02.119 INFO  codeg_lib::acp::background_watch | [bg-watch] surfacing connection=<id-20> turns=2 settled=0 outstanding=2 watermark=10505383
12:13:08.554 TRACE notify::windows | Event: path = `\\?\<workspace-D>\<dir-17>\desktop\<file-1>`, action = 3
12:13:08.563 TRACE notify::windows | Event: path = `\\?\<workspace-D>\<dir-17>\desktop\<file-2>`, action = 2
12:13:08.564 TRACE notify::windows | Event: path = `\\?\<workspace-D>\<dir-17>\desktop\<file-1>`, action = 2
12:13:08.564 TRACE notify::windows | Event: path = `\\?\<workspace-D>\<dir-17>\desktop\node_modules`, action = 3
12:13:08.564 TRACE notify::windows | Event: path = `\\?\<workspace-D>\<dir-17>\desktop\node_modules\@napi-rs`, action = 2
12:13:08.564 TRACE notify::windows | Event: path = `\\?\<workspace-D>\<dir-17>\desktop\node_modules`, action = 3
12:13:08.624 TRACE notify::windows | Event: path = `\\?\<workspace-D>\<dir-17>\desktop\<file-5>`, action = 2
12:13:08.625 TRACE notify::windows | Event: path = `\\?\<workspace-D>\<dir-17>\desktop\node_modules\.bin`, action = 3
12:13:08.625 TRACE notify::windows | Event: path = `\\?\<workspace-D>\<dir-17>\desktop\<file-3>`, action = 2
12:13:08.625 TRACE notify::windows | Event: path = `\\?\<workspace-D>\<dir-17>\desktop\<file-4>`, action = 2
12:13:08.625 TRACE notify::windows | Event: path = `\\?\<workspace-D>\<dir-17>\desktop\<file-6>`, action = 2
12:13:08.625 TRACE notify::windows | Event: path = `\\?\<workspace-D>\<dir-17>\desktop\node_modules\.bin`, action = 3
12:13:08.625 TRACE notify::windows | Event: path = `\\?\<workspace-D>\<dir-17>\desktop\<file-9>`, action = 2
12:13:08.625 TRACE notify::windows | Event: path = `\\?\<workspace-D>\<dir-17>\desktop\<file-8>`, action = 2
12:13:08.625 TRACE notify::windows | Event: path = `\\?\<workspace-D>\<dir-17>\desktop\<file-7>`, action = 2
12:13:08.625 TRACE notify::windows | Event: path = `\\?\<workspace-D>\<dir-17>\desktop\<file-11>`, action = 2
12:13:08.626 TRACE notify::windows | Event: path = `\\?\<workspace-D>\<dir-17>\desktop\node_modules\.bin`, action = 3
12:13:08.626 TRACE notify::windows | Event: path = `\\?\<workspace-D>\<dir-17>\desktop\<file-12>`, action = 2
12:13:08.626 TRACE notify::windows | Event: path = `\\?\<workspace-D>\<dir-17>\desktop\<file-14>`, action = 2
12:13:08.626 TRACE notify::windows | Event: path = `\\?\<workspace-D>\<dir-17>\desktop\<file-17>`, action = 2
12:13:08.626 TRACE notify::windows | Event: path = `\\?\<workspace-D>\<dir-17>\desktop\<file-15>`, action = 2
12:13:08.626 TRACE notify::windows | Event: path = `\\?\<workspace-D>\<dir-17>\desktop\node_modules\.bin`, action = 3
12:13:08.626 TRACE notify::windows | Event: path = `\\?\<workspace-D>\<dir-17>\desktop\<file-10>`, action = 2
12:13:08.626 TRACE notify::windows | Event: path = `\\?\<workspace-D>\<dir-17>\desktop\<file-13>`, action = 2
12:13:08.626 TRACE notify::windows | Event: path = `\\?\<workspace-D>\<dir-17>\desktop\<file-18>`, action = 2
12:13:08.626 TRACE notify::windows | Event: path = `\\?\<workspace-D>\<dir-17>\desktop\<file-16>`, action = 2
12:13:08.626 TRACE notify::windows | Event: path = `\\?\<workspace-D>\<dir-17>\desktop\node_modules\.bin`, action = 3
12:13:08.626 TRACE notify::windows | Event: path = `\\?\<workspace-D>\<dir-17>\desktop\<file-19>`, action = 2
12:13:08.627 TRACE notify::windows | Event: path = `\\?\<workspace-D>\<dir-17>\desktop\<file-23>`, action = 2
12:13:08.627 TRACE notify::windows | Event: path = `\\?\<workspace-D>\<dir-17>\desktop\<file-21>`, action = 2
12:13:08.627 TRACE notify::windows | Event: path = `\\?\<workspace-D>\<dir-17>\desktop\<file-22>`, action = 2
12:13:08.627 TRACE notify::windows | Event: path = `\\?\<workspace-D>\<dir-17>\desktop\node_modules\.bin`, action = 3
12:13:08.627 TRACE notify::windows | Event: path = `\\?\<workspace-D>\<dir-17>\desktop\<file-20>`, action = 2
12:13:08.627 TRACE notify::windows | Event: path = `\\?\<workspace-D>\<dir-17>\desktop\<file-26>`, action = 2
12:13:08.627 TRACE notify::windows | Event: path = `\\?\<workspace-D>\<dir-17>\desktop\node_modules\.bin`, action = 3
12:13:08.627 TRACE notify::windows | Event: path = `\\?\<workspace-D>\<dir-17>\desktop\<file-24>`, action = 2
12:13:08.627 TRACE notify::windows | Event: path = `\\?\<workspace-D>\<dir-17>\desktop\<file-29>`, action = 2
12:13:08.627 TRACE notify::windows | Event: path = `\\?\<workspace-D>\<dir-17>\desktop\<file-27>`, action = 2
12:13:08.627 TRACE notify::windows | Event: path = `\\?\<workspace-D>\<dir-17>\desktop\node_modules\.bin`, action = 3
12:13:08.627 TRACE notify::windows | Event: path = `\\?\<workspace-D>\<dir-17>\desktop\<file-25>`, action = 2

Available on request

Three minidumps (~3 MB each) can be shared privately, since they contain process memory. Without PDBs I can only give module offsets; if symbols for 0.42.1 are available I can post a symbolicated stack.

Activity

  1. xintaofei commented on Nov 10, 2026

    @xintaofei
    xintaofei
    on Nov 10, 2026
    Collaborator

    codeg work task 500 is done — it made no changes.

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