[BUG] Cannot start or update CC due to JS FATAL ERROR

Resolved 💬 10 comments Opened Jan 22, 2026 by mdca Closed Feb 28, 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?

When i start CC v2.1.15 in Win11 64x, it loads but immediately crashes. The same happens when i run claude install to migrate to native installation.

What Should Happen?

Claude should not crash.

Error Messages/Logs

<--- Last few GCs --->

[28496:00000269366C3000]     6325 ms: Mark-Compact 2039.5 (2079.8) -> 2039.4 (2079.0) MB, pooled: 6 MB, 35.79 / 0.00 ms  (average mu = 0.774, current mu = 0.559) allocation failure; scavenge might not succeed
[28496:00000269366C3000]     6431 ms: Mark-Compact 2049.4 (2089.0) -> 2049.4 (2089.0) MB, pooled: 6 MB, 90.05 / 0.00 ms  (average mu = 0.533, current mu = 0.153) allocation failure; scavenge might not succeed


<--- JS stacktrace --->

FATAL ERROR: Reached heap limit Allocation failed - JavaScript heap out of memory
----- Native stack trace -----

 1: 00007FF6E10B70F7 node::SetCppgcReference+18039
 2: 00007FF6E101AA18 v8::base::CPU::num_virtual_address_bits+102920
 3: 00007FF6E1C1F151 v8::Isolate::ReportExternalAllocationLimitReached+65
 4: 00007FF6E1C0BCD6 v8::Function::Experimental_IsNopFunction+3302
 5: 00007FF6E1A68420 v8::internal::StrongRootAllocatorBase::StrongRootAllocatorBase+33904
 6: 00007FF6E1A64AAA v8::internal::StrongRootAllocatorBase::StrongRootAllocatorBase+19194
 7: 00007FF6E1A7B08C v8::Isolate::GetHeapProfiler+8012
 8: 00007FF6E1A7B90A v8::Isolate::GetHeapProfiler+10186
 9: 00007FF6E1A869F1 v8::Isolate::GetHeapProfiler+55473
10: 00007FF6E1A96562 v8::Isolate::GetHeapProfiler+119842
11: 00007FF6E1A9B458 v8::Isolate::GetHeapProfiler+140056
12: 00007FF6E1992257 v8::Object::GetIsolate+372215
13: 00007FF6E198F26D v8::Object::GetIsolate+359949
14: 00007FF6E1992594 v8::Object::GetIsolate+373044
15: 00007FF6E1BC2515 v8::SharedValueConveyor::SharedValueConveyor+265589
16: 00007FF6E1BC2790 v8::SharedValueConveyor::SharedValueConveyor+266224
17: 00007FF681CAD3FA

Steps to Reproduce

Run claude or claude install on Win11 in PowerShell, Warp, Git Bash, anything really.

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.1.15

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Warp

Additional Information

_No response_

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