issue 终稿(渲染器主线程深递归序列化 hang→闪退)——v1 草稿升级,候 Mac ZCode 签认后外发

Title: [Bug] macOS Desktop: renderer main thread hangs in deep recursive serialization under long sessions / long streaming output (3.14.4)

提交前确认 · Pre-submission checklist

• 我已搜索过现有 issue,确认这不是重复 / I searched existing issues and confirmed this isn't a duplicate.(已核对 [Bug] macOS Desktop: main process crashes repeatedly (EXC_BAD_ACCESS / NULL deref on UI rendering thread) #896 主进程 EXC_BAD_ACCESS / [Bug] 桌面版切换「闲时任务」面板后返回主会话卡顿，Renderer/GPU 进程持续高 CPU #407 GPU 高 CPU / Chat pane frozen after app restart: messages persisted to DB but never rendered; input queue promotes out of order (0.16.5, Windows) #559 重启后不渲染,均不同族)
• 我已阅读 CONTRIBUTING.md / I've read CONTRIBUTING.md.

问题类别 · Category

稳定性 / 崩溃 · Stability / Crash

涉及的 Agent 框架 · Agent framework

ZCode Agent(自研)

严重程度 · Severity

阻塞使用 · Blocking(渲染器冻结/闪退后 App 核心功能不可用)

复现频率 · Reproducibility

偶现 · Sometimes(5 例,约 5% 频率,随会话体量上涨)

问题描述 · Description

The renderer main thread spins at 100% of a single core inside a deep recursive serialization loop, freezing the whole UI; newer occurrences escalate to outright renderer death with no crash report written. The trigger is long sessions + long streaming output rendering; CDP injection is only a co-factor — case 5 crashed with all CDP clients disconnected and zero injection activity. Earlier occurrences were recoverable hangs; from occurrence 4 onward the renderer process dies directly.

Key evidence (macOS sample(1), 2117 samples per capture):

• Main thread owns 2117/2117 samples in JIT-compiled JS recursion via v8::Function::Call; all other 22 threads fully idle.
• A stable 39-frame skeleton is shared symbol-for-symbol across two occurrences; v8_inspector value/stack serialization frames are a co-occurring witness, not the root cause.
• Hottest self-recursive ring sits under node::permission::AddonPermission::Apply (parent/child offsets identical, 1614+311 split — treated as a symbolization artifact); v8::ScriptCompiler::ConsumeCodeCacheTask::Run appears inside the ring (2071/2117 samples) ⇒ the spinning path repeatedly triggers lazy code-cache deserialization.
• One independent hang (distinct fault) shares only the first 11 entry frames.

复现步骤 · Steps to reproduce

1. Open ZCode desktop with --remote-debugging-port=9222 on macOS (Apple Silicon), v3.14.4.7912
2. Work a long interactive session (hundreds of k tokens, markdown-heavy assistant output)
3. Render long streaming markdown output — with or without any CDP client attached (case 5: zero CDP clients, port down, still crashed)
4. Within minutes-to-hours the renderer freezes at 100% single-core (UI stops accepting input; debug HTTP endpoint stays alive giving a false "healthy" signal), or the renderer dies outright leaving no crash report (DiagnosticReports empty, app crash dir empty)

Accelerated repro with active CDP injection: Input.insertText of multi-KB markdown into the composer during the renderer's streaming window, then repeated verify probes — hang observed within minutes on two independent occasions.

期望表现 · Expected behavior

Renderer stays responsive: deep serialization yields/checkpoints; oversized object/DOM serialization is clamped or moved off the main thread; a renderer crash produces a crash report for diagnosis.

实际表现 · Actual behavior

• Main thread pegged at 100% single core, UI frozen; or renderer dies outright (occurrences 4–5) with no crash report anywhere (system DiagnosticReports and in-app crash dir both empty).
• Session data survives via the official session DB (restart recovers), but the app needs a manual restart; during hangs the debug HTTP endpoint stays alive, misleading port-liveness monitors.

ZCode 版本 · ZCode version

3.14.4.7912

设备 / 系统 / 浏览器 · Device / OS / Browser

macOS desktop app, Apple Silicon (Mac mini), ARM64

截图 / 录屏 / 日志 · Screenshots / Recordings / Logs

• Five-occurrence timeline 2026-10-03~10-04: first three recoverable hangs, occurrence 4+ direct renderer death; occurrence 5 crashed with 9222 down and zero injection (proves injection-independent trigger).
• Three full sample(1) reports (2117 samples each) + quantitative 39-frame cross-occurrence comparison table available on request (privacy-screened: symbol names and sample counts only; no memory strings/addresses).
• Related: Chat pane frozen after app restart: messages persisted to DB but never rendered; input queue promotes out of order (0.16.5, Windows) #559 (Windows, long session ~780k tokens, transcript pane frozen) — possibly same long-session pressure family, cross-platform datapoint.

Reported by: PC ZCode & Mac ZCode operators (multi-agent setup running ZCode desktop on Windows + macOS ARM64, v3.14.4.7912, dual-signed)