### Preflight Checklist - [x] I have searched [existing issues](https://github.com/anthropics/claude-code/issues?q=is%3Aissue%20state%3Aopen%20label%3Abug) and this hasn't been reported yet - [x] This is a single bug report (please file separate reports for different bugs) - [x] I am using the latest version of Claude Code ### What's Wrong? Claude Code experienced runaway memory growth at 2,108,208 MB/hour, crashing the system when memory spiked from normal usage to 150GB in approximately 2

Extreme memory leak, Claude Code, 2,108,208 MB/hour

Status Open

Reported on v2.1.215

Maintainer reply None cached

Activity 0 comments · opened Jul 21, 2026

Preflight Checklist

[x] I have searched existing issues and this hasn't been reported yet
[x] This is a single bug report (please file separate reports for different bugs)
[x] I am using the latest version of Claude Code

What's Wrong?

Claude Code experienced runaway memory growth at 2,108,208 MB/hour, crashing the system when memory spiked from normal usage to 150GB in approximately 20 seconds.

Diagnostics from /heapdump

RSS: 0.37 GB (peak 0.37 GB)
JS heap: 0.06 GB
Unaccounted native memory: 0.27 GB (most of the leak is in native code, not JavaScript objects)
Growth rate: 2,108,208 MB/hour

The leak appears to be in the native layer rather than JavaScript, possibly related to file watching, indexing, or native modules.

Steps taken

Generated diagnostics using /heapdump (attaching -diagnostics.json file)
[Add whether you tried safe mode and the result]
[Add what you were doing when it occurred]

Environment

OS: macOS Tahoe 26.4
Claude Code version: Version 1.22209.3 (babe11)
Last crash: during a git rebase
Intermittent: doesn't happen in all sessions. Appears to be project-specific (one project triggers it more frequently)

099599bc-64b5-426b-b6a7-7d579c64e1ab-diagnostics 2.json

What Should Happen?

Claude Code should maintain stable memory usage during normal operations, including git rebases. Memory consumption should stay within reasonable bounds (under a few GB) and not spike to 150GB, causing system crashes.

Error Messages/Logs

Steps to Reproduce

Attaching the -diagnostics.json file from /heapdump

{
"timestamp": "2026-07-21T14:37:17.215Z",
"sessionId": "099599bc-64b5-426b-b6a7-7d579c64e1ab",
"trigger": "manual",
"dumpNumber": 0,
"uptimeSeconds": 0.649932875,
"memoryUsage": {
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"heapTotal": 67579904,
"external": 41829337,
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"rss": 399097856
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"mbPerHour": 2108208.09764393
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"activeHandles": 0,
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"analysis": {
"potentialLeaks": [
"Native memory > heap - leak may be in native addons (node-pty, sharp, etc.)",
"High memory growth rate: 2108208.1 MB/hour"
],
"recommendation": "WARNING: 2 potential leak indicator(s) found. See potentialLeaks array."
},
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}

Claude Model

Opus

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

1.22209.3 (babe11)

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Other

Additional Information

Happening in Claude desktop app, even on multiple older Claude versions, possibly for the last 4 updates. When I think it's fixed...suddenly it will happen again.

View original on GitHub ↗