Segfault crash on Windows: Bun v1.3.5 segmentation fault during long-running agent task

Bug Report

Environment

• Claude Code version: 2.1.23
• Bun version (bundled): 1.3.5 (1e86cebd)
• OS: Windows 11 x64 (baseline)
• CPU features: sse42 avx avx2
• Machine RAM: 34.27GB

Description

Claude Code crashes with a segmentation fault during a long-running agent task (Explore subagent with Sonnet). The crash occurs after ~97 seconds of execution with RSS at 0.89GB (peak 1.07GB).

Crash Details

Bun v1.3.5 (1e86cebd) Windows x64 (baseline)
Windows v.win11_dt
CPU: sse42 avx avx2
Args: "C:\Users\casey\.local\bin\claude.exe" "--dangerously-skip-permissions"
Features: Bun.stderr(2) Bun.stdin(2) Bun.stdout(2) abort_signal(14) fetch(627) jsc spawn(758) standalone_executable process_dlopen 
Builtins: "bun:main" "node:assert" "node:async_hooks" "node:buffer" "node:child_process" "node:constants" "node:crypto" "node:domain" "node:events" "node:fs" "node:fs/promises" "node:http" "node:https" "node:module" "node:net" "node:os" "node:path" "node:path/posix" "node:path/win32" "node:perf_hooks" "node:process" "node:querystring" "node:stream" "node:timers/promises" "node:tls" "node:tty" "node:url" "node:util" "node:zlib" "node:worker_threads" "undici" "ws" "node-fetch" "node:inspector" "node:http2" "node:diagnostics_channel" 
Elapsed: 97223ms | User: 14546ms | Sys: 5828ms
RSS: 0.89GB | Peak: 1.07GB | Commit: 1.10GB | Faults: 610048 | Machine: 34.27GB

panic(main thread): Segmentation fault at address 0xFFFFFFFFFFFFFFFF

Bun Crash Report Link

https://bun.report/1.3.5/e_11e86cebmgEuhogCg1dlIkzi3d43+1uB4pmyuB65jyuBy2i5Io37nG2nowmBy0rwFmtb4hMop/oyDCYKERNEL32.DLLut0LCSntdll.dll4zijBA2DD

Steps to Reproduce

1. Run Claude Code on Windows 11 with --dangerously-skip-permissions
2. Trigger a long-running agent task (e.g., an Explore subagent using Sonnet that performs 50+ tool uses)
3. After ~90-100 seconds and ~1GB memory usage, the process crashes with a segfault

Expected Behavior

Claude Code should complete the agent task without crashing.

Additional Context

• The crash address 0xFFFFFFFFFFFFFFFF (-1) suggests a null/invalid pointer dereference
• The task involved an Explore subagent (Sonnet 4.5) performing 50+ tool uses including file reads and bash commands
• Memory usage peaked at 1.07GB which is within reasonable bounds
• Bun 1.3.7 is the latest release and may contain fixes for this issue — consider bumping the bundled Bun version