V8 Maglev JIT causes STATUS_STACK_BUFFER_OVERRUN (0xC0000409) on Windows 11 Insider build 26200

What happened?

Node.js processes crash with exit code -1073740791 (0xC0000409 / STATUS_STACK_BUFFER_OVERRUN) within 20-70 seconds of startup when running a non-trivial application (WebSocket server with HTTP, Telegram bot polling, and plugin system) on Windows 11 Insider (Canary channel).

The crash is caused by V8's Maglev JIT compiler tier. Workaround: --no-maglev flag eliminates the crash entirely.

Reproduction

Environment:

• Node.js: v25.8.0
• V8: 14.1.146.11-node.20
• OS: Windows 11 Pro for Workstations, Insider Canary build 10.0.26200.0
• Arch: x64

Steps:

1. Run a long-lived Node.js application that uses fetch(), WebSocket, and timers on Windows 11 Insider build 26200
2. Process crashes with exit code -1073740791 (0xC0000409) within 20-70 seconds
3. No JavaScript stack trace — the crash is in native JIT-compiled code via __fastfail

Flags tested:

--no-maglev is the minimal workaround — disabling only the Maglev tier prevents the crash while keeping TurboFan and fetch() functional.

Additional context:

• A bare Node.js HTTP server (http.createServer) does NOT crash — the issue requires enough code to trigger Maglev optimization
• Crash bypasses Windows Error Reporting (__fastfail / SEH)
• Windows Event Viewer shows the Insider build has kernel-level instability (BlueScreen events, VIDEO_ENGINE_TIMEOUT_DETECTED), suggesting stricter CFG enforcement
• The same application runs without issues on Windows Server 2019 and stable Windows builds

Expected behavior

Node.js should not crash with STATUS_STACK_BUFFER_OVERRUN. Maglev-compiled code should respect Windows CFG/CET enforcement on Insider builds.

Workaround

Pass --no-maglev as a command-line flag (cannot be set via NODE_OPTIONS):

node --no-maglev app.js

Không xác định được tệp mã nguồn hoặc bài kiểm thử nào. Hãy bắt đầu bằng cách tái hiện lỗi crash trên Windows 11 Insider build 26200 với Node.js v25.8.0, so sánh việc thực thi mặc định với --no-maglev và --no-turbofan. Hoàn thành nghĩa là xác định được nguyên nhân Maglev/Windows đã được xác nhận và ngăn STATUS_STACK_BUFFER_OVERRUN mà không yêu cầu --no-maglev.