[Bug] Critical memory leak: arrayBuffers reach 4.2GB in fresh session

[aokitashipro]

Bug Description
[BUG] Severe memory leak on fresh session: 4.2GB arrayBuffers in 3.5 minutes

Bug Description

Massive memory leak occurs immediately on a fresh session.
arrayBuffers reaches 4.2GB within 3.5 minutes of starting.

Environment

• Claude Code version: 2.1.72
• Node: v24.3.0
• Platform: macOS (darwin)

Heap Dump Data (from /heapdump)

• uptimeSeconds: 214
• arrayBuffers: 4,209,657,864 bytes (4.21 GB)
• external: 4,920,081,767 bytes (4.92 GB)
• heapUsed: 4,960,605,927 bytes (4.96 GB)
• memoryGrowthRate: 74,299 MB/hour

Steps to Reproduce

1. Start a fresh claude session
2. Run a task with multiple tool uses (~12 tool uses, 42k tokens)
3. Run /heapdump
4. Observe 4+ GB arrayBuffers after only 3.5 minutes

Expected Behavior

Memory should remain stable and bounded in a fresh session.

Actual Behavior

arrayBuffers grows to 4.2GB within 3.5 minutes with no signs of GC.

Environment Info

• Platform: darwin
• Terminal: ghostty
• Version: 2.1.72
• Feedback ID: ab48082d-5988-4dac-b112-98101425c018

Errors

[{"error":"Error: NON-FATAL: Lock acquisition failed for /Users/a-aoki/.local/share/claude/versions/2.1.72 (expected in multi-process scenarios)\n    at byT (/$bunfs/root/src/entrypoints/cli.js:2612:2025)\n    at kEq (/$bunfs/root/src/entrypoints/cli.js:2612:1169)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-03-11T23:42:04.586Z"},{"error":"Error: NON-FATAL: Lock acquisition failed for /Users/a-aoki/.local/share/claude/versions/2.1.70 (expected in multi-process scenarios)\n    at byT (/$bunfs/root/src/entrypoints/cli.js:2612:2025)\n    at Kv7 (/$bunfs/root/src/entrypoints/cli.js:2610:20514)\n    at async <anonymous> (/$bunfs/root/src/entrypoints/cli.js:2612:4618)\n    at async WF_ (/$bunfs/root/src/entrypoints/cli.js:2612:4584)\n    at async T (/$bunfs/root/src/entrypoints/cli.js:13341:4864)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-03-11T23:52:13.477Z"},{"error":"Error: NON-FATAL: Lock acquisition failed for /Users/a-aoki/.local/share/claude/versions/2.1.69 (expected in multi-process scenarios)\n    at byT (/$bunfs/root/src/entrypoints/cli.js:2612:2025)\n    at Kv7 (/$bunfs/root/src/entrypoints/cli.js:2610:20514)\n    at async <anonymous> (/$bunfs/root/src/entrypoints/cli.js:2612:4618)\n    at async WF_ (/$bunfs/root/src/entrypoints/cli.js:2612:4584)\n    at async T (/$bunfs/root/src/entrypoints/cli.js:13341:4864)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-03-11T23:52:13.477Z"},{"error":"Error: NON-FATAL: Lock acquisition failed for /Users/a-aoki/.local/share/claude/versions/2.1.62 (expected in multi-process scenarios)\n    at byT (/$bunfs/root/src/entrypoints/cli.js:2612:2025)\n    at Kv7 (/$bunfs/root/src/entrypoints/cli.js:2610:20514)\n    at async <anonymous> (/$bunfs/root/src/entrypoints/cli.js:2612:4618)\n    at async WF_ (/$bunfs/root/src/entrypoints/cli.js:2612:4584)\n    at async T (/$bunfs/root/src/entrypoints/cli.js:13341:4864)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-03-11T23:52:13.477Z"},{"error":"Error: NON-FATAL: Lock acquisition failed for /Users/a-aoki/.local/share/claude/versions/2.1.68 (expected in multi-process scenarios)\n    at byT (/$bunfs/root/src/entrypoints/cli.js:2612:2025)\n    at Kv7 (/$bunfs/root/src/entrypoints/cli.js:2610:20514)\n    at async <anonymous> (/$bunfs/root/src/entrypoints/cli.js:2612:4618)\n    at async WF_ (/$bunfs/root/src/entrypoints/cli.js:2612:4584)\n    at async T (/$bunfs/root/src/entrypoints/cli.js:13341:4864)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-03-11T23:52:13.477Z"},{"error":"Error: NON-FATAL: Lock acquisition failed for /Users/a-aoki/.local/share/claude/versions/2.1.66 (expected in multi-process scenarios)\n    at byT (/$bunfs/root/src/entrypoints/cli.js:2612:2025)\n    at Kv7 (/$bunfs/root/src/entrypoints/cli.js:2610:20514)\n    at async <anonymous> (/$bunfs/root/src/entrypoints/cli.js:2612:4618)\n    at async WF_ (/$bunfs/root/src/entrypoints/cli.js:2612:4584)\n    at async T (/$bunfs/root/src/entrypoints/cli.js:13341:4864)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-03-11T23:52:13.477Z"},{"error":"Error: NON-FATAL: Lock acquisition failed for /Users/a-aoki/.local/share/claude/versions/2.1.63 (expected in multi-process scenarios)\n    at byT (/$bunfs/root/src/entrypoints/cli.js:2612:2025)\n    at Kv7 (/$bunfs/root/src/entrypoints/cli.js:2610:20514)\n    at async <anonymous> (/$bunfs/root/src/entrypoints/cli.js:2612:4618)\n    at async WF_ (/$bunfs/root/src/entrypoints/cli.js:2612:4584)\n    at async T (/$bunfs/root/src/entrypoints/cli.js:13341:4864)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-03-11T23:52:13.477Z"},{"error":"Error: NON-FATAL: Lock acquisition failed for /Users/a-aoki/.local/share…

Note: Content was truncated.

[github-actions]

Found 3 possible duplicate issues:

1. Memory leak: 2.92 GB external ArrayBuffers after 34 min session (v2.1.72) #33320
2. [BUG] Memory Leak: ArrayBuffer accumulation causing ~92 GB/hour growth (v2.1.71) #32892
3. Memory leak: ArrayBuffers consuming 4+ GB within seconds of startup #32729

This issue will be automatically closed as a duplicate in 3 days.

• If your issue is a duplicate, please close it and 👍 the existing issue instead
• To prevent auto-closure, add a comment or 👎 this comment

🤖 Generated with Claude Code

[jeffbowen]

+1. Up to 22+ GB/hr in just 99 seconds of uptime. FWIW, it's now showing a "“Terminal” would like to access data from other apps." prompt on macOS when I run claude. That didn't used to happen. Related?

{
  "timestamp": "2026-03-11T23:53:30.928Z",
  "sessionId": "95ccc0cc-4915-41ed-98c2-04325a417b7a",
  "trigger": "manual",
  "dumpNumber": 0,
  "uptimeSeconds": 99.968510833,
  "memoryUsage": {
    "heapUsed": 11740551678,
    "heapTotal": 50643968,
    "external": 11699603343,
    "arrayBuffers": 11135186678,
    "rss": 659488768
  },
  "memoryGrowthRate": {
    "bytesPerSecond": 6596965.009328719,
    "mbPerHour": 22648.88194425906
  },
  "v8HeapStats": {
    "heapSizeLimit": 25404702720,
    "mallocedMemory": 11741862879,
    "peakMallocedMemory": 2540470272,
    "detachedContexts": 0,
    "nativeContexts": 1
  },
  "resourceUsage": {
    "maxRSS": 2601441558528,
    "userCPUTime": 20549680,
    "systemCPUTime": 7046540
  },
  "activeHandles": 0,
  "activeRequests": 0,
  "analysis": {
    "potentialLeaks": [
      "High memory growth rate: 22648.9 MB/hour"
    ],
    "recommendation": "WARNING: 1 potential leak indicator(s) found. See potentialLeaks array."
  },
  "platform": "darwin",
  "nodeVersion": "v24.3.0",
  "ccVersion": "2.1.72"
}