JavaScript heap out of memory error (likely during compaction)

[coverband]

Observed the following error messages from the CLI when it crashed and returned to command prompt:

<--- Last few GCs --->

[34904:000002AD56250000] 253242356 ms: Mark-Compact 4037.2 (4129.1) -> 4025.2 (4129.1) MB, pooled: 5 MB, 1350.57 / 1.63 ms (average mu = 0.349, current mu = 0.445) allocation failure; scavenge might not succeed
[34904:000002AD56250000] 253244190 ms: Mark-Compact 4041.7 (4129.1) -> 4014.9 (4131.1) MB, pooled: 14 MB, 1601.74 / 3.10 ms (average mu = 0.250, current mu = 0.127) allocation failure; scavenge might not succeed

<--- JS stacktrace --->

FATAL ERROR: Ineffective mark-compacts near heap limit Allocation failed - JavaScript heap out of memory
----- Native stack trace -----

1: 00007FF7F0CB711D node::SetCppgcReference+17725
2: 00007FF7F0C1A138 SSL_get_quiet_shutdown+92344
3: 00007FF7F17A0C51 v8::Isolate::ReportExternalAllocationLimitReached+65
4: 00007FF7F178D8D6 v8::Function::Experimental_IsNopFunction+2870
5: 00007FF7F15DAA20 v8::internal::StrongRootAllocatorBase::StrongRootAllocatorBase+31456
6: 00007FF7F15D471A v8::internal::StrongRootAllocatorBase::StrongRootAllocatorBase+6106
7: 00007FF7F15CFDB5 v8::CpuProfileNode::GetScriptResourceNameStr+188453
8: 00007FF7F0F5309D BIO_ssl_shutdown+189

Let me know if you need more info. This was while using blackboxai/openai/gpt-5.1 model.

[singhvibhanshu]

Can you please give more context of this issue? Also, kindly tell me how to reproduce this?

[coverband]

Actually, I just had the same issue now. If you can point me to a place and help me pull some logs to share, that would be the easiest.

So, I worked with blackboxai/openai/gpt-5.1 model to make a detailed plan. Since it lost context and forgot where we were, I asked it to document status and progress as we went along. After experiencing this "amnesia" twice, I pointed it again to the plan file (markdown with 283 lines and 16.0 KB size). It outlined the plan in the CLI, then asked me to confirm how to proceed with the edits. I selected "1. Yes, and auto-accept edits", and it just crashed with the following info:

<--- Last few GCs --->

[47360:0000015E78487000] 158529233 ms: Scavenge 4027.5 (4124.1) -> 4026.1 (4128.3) MB, pooled: 10 MB, 15.65 / 0.00 ms  (average mu = 0.184, current mu = 0.031) allocation failure;
[47360:0000015E78487000] 158530922 ms: Mark-Compact 4037.8 (4128.3) -> 4010.0 (4126.6) MB, pooled: 12 MB, 1612.92 / 4.59 ms  (average mu = 0.297, current mu = 0.394) allocation failure; scavenge might not succeed


<--- JS stacktrace --->

FATAL ERROR: Ineffective mark-compacts near heap limit Allocation failed - JavaScript heap out of memory
----- Native stack trace -----

 1: 00007FF7F0CB711D node::SetCppgcReference+17725
 2: 00007FF7F0C1A138 SSL_get_quiet_shutdown+92344
 3: 00007FF7F17A0C51 v8::Isolate::ReportExternalAllocationLimitReached+65
 4: 00007FF7F178D8D6 v8::Function::Experimental_IsNopFunction+2870
 5: 00007FF7F15DAA20 v8::internal::StrongRootAllocatorBase::StrongRootAllocatorBase+31456
 6: 00007FF7F15D471A v8::internal::StrongRootAllocatorBase::StrongRootAllocatorBase+6106
 7: 00007FF7F15CFDB5 v8::CpuProfileNode::GetScriptResourceNameStr+188453
 8: 00007FF7F0F5309D BIO_ssl_shutdown+189

[coverband]

(BTW, this never happens to me with Claude Code.)