[Bug] EBUSY: Resource locked when accessing .claude.json config file

Bug Description
Claude Code abruptly crashes with this error message:

This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). The promise rejected with the reason:
Error: EBUSY: resource busy or locked, open 'C:\Users\dev.account\.claude.json'
at Module.openSync (node:fs:561:18)
at file:///C:/Users/dev.account/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:9:999
at sI (file:///C:/Users/dev.account/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:8:8084)
at Object.writeFileSync (file:///C:/Users/dev.account/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:9:774)
at iR (file:///C:/Users/dev.account/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:4806:1175)
at DV9 (file:///C:/Users/dev.account/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:4785:11585)
at n0 (file:///C:/Users/dev.account/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:4785:10222)
at OV7 (file:///C:/Users/dev.account/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:5027:4897)
at hR0.<anonymous> (file:///C:/Users/dev.account/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:5046:7366)
at process.processTicksAndRejections (node:internal/process/task_queues:105:5)

Environment Info

• Platform: win32
• Terminal: windows-terminal
• Version: 2.0.72
• Feedback ID: 708688c9-bd61-484a-b644-f6592c01a87a

Errors

[{"error":"AbortError: The operation was aborted\n    at abortChildProcess (node:child_process:750:27)\n    at AbortSignal.onAbortListener (node:child_process:820:7)\n    at [nodejs.internal.kHybridDispatch] (node:internal/event_target:845:20)\n    at AbortSignal.dispatchEvent (node:internal/event_target:778:26)\n    at runAbort (node:internal/abort_controller:486:10)\n    at abortSignal (node:internal/abort_controller:457:3)\n    at AbortController.abort (node:internal/abort_controller:505:5)\n    at Timeout._onTimeout (file:///C:/Users/mathew.burkitt/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:5027:6966)\n    at listOnTimeout (node:internal/timers:588:17)\n    at process.processTimers (node:internal/timers:523:7)","timestamp":"2025-12-18T18:29:20.084Z"}]