yaml-language-server loads forever and crashes with out of memory error #1190
Description
Describe the bug
As of recently I didn't have any bugs. I'm not sure what has caused this issue. Suddenly I can't use yaml-language-server anymore.
yaml-language-server keeps loading forever and eventually crashes because it ran out of memory. I have tried it in nvim and also in VS Code.
VS Code loads for a few minutes when trying to use autocomplete in a yaml file. It eventually just stops.
In nvim I get an error saying "LSP Timeout". In the logs I can find the following output:
[WARN][2026-02-22 20:35:41] ...m/lsp/client.lua:875 "The language server yamlls triggers a registerCapability handler for workspace/didChangeConfiguration despite dynamicRegistration set to false. Report upstream, this warning is harmless"
[ERROR][2026-02-22 20:37:13] ...p/_transport.lua:36 "rpc" "yaml-language-server" "stderr" "\n<--- Last few GCs --->\n\n[13004:0x19886000] 33199 ms: Mark-Compact 3896.8 (4022.2) -> 3895.9 (4027.2) MB, pooled: 0 MB, 3466.61 / 0.00 ms (average mu = 0.333, current mu = 0.105) full hash-table; GC in old space requested\n[13004:0x19886000] 36498 ms: Mark-Compact 3895.9 (4027.2) -> 3895.9 (4026.5) MB, pooled: 1 MB, 3298.05 / 0.00 ms (average mu = 0.184, current mu = 0.000) full hash-table; GC in old space requested\n\nFATAL ERROR: invalid table size Allocation failed - JavaScript heap out of memory\n----- Native stack trace -----\n\n"
[ERROR][2026-02-22 20:37:13] ...p/_transport.lua:36 "rpc" "yaml-language-server" "stderr" " 1: 0xf4db93 node::OOMErrorHandler(char const*, v8::OOMDetails const&) [node]\n"
[ERROR][2026-02-22 20:37:13] ...p/_transport.lua:36 "rpc" "yaml-language-server" "stderr" " 2: 0x13b24d0 v8::Utils::ReportOOMFailure(v8::internal::Isolate*, char const*, v8::OOMDetails const&) [node]\n"
[ERROR][2026-02-22 20:37:13] ...p/_transport.lua:36 "rpc" "yaml-language-server" "stderr" " 3: 0x13b25bf v8::internal::V8::FatalProcessOutOfMemory(v8::internal::Isolate*, char const*, v8::OOMDetails const&) [node]\n"
[ERROR][2026-02-22 20:37:13] ...p/_transport.lua:36 "rpc" "yaml-language-server" "stderr" " 4: 0x164b0a5 [node]\n"
[ERROR][2026-02-22 20:37:13] ...p/_transport.lua:36 "rpc" "yaml-language-server" "stderr" " 5: 0x19828c8 [node]\n"
[ERROR][2026-02-22 20:37:13] ...p/_transport.lua:36 "rpc" "yaml-language-server" "stderr" " 6: 0x1982a72 v8::internal::Handle<v8::internal::EphemeronHashTable> v8::internal::HashTable<v8::internal::EphemeronHashTable, v8::internal::EphemeronHashTableShape>::EnsureCapacity<v8::internal::Isolate, v8::internal::Handle>(v8::internal::Isolate*, v8::internal::Handle<v8::internal::EphemeronHashTable>, int, v8::internal::AllocationType) [node]\n"
[ERROR][2026-02-22 20:37:13] ...p/_transport.lua:36 "rpc" "yaml-language-server" "stderr" " 7: 0x1994ca4 v8::internal::ObjectHashTableBase<v8::internal::EphemeronHashTable, v8::internal::EphemeronHashTableShape>::Put(v8::internal::Isolate*, v8::internal::Handle<v8::internal::EphemeronHashTable>, v8::internal::DirectHandle<v8::internal::Object>, v8::internal::DirectHandle<v8::internal::Object>, int) [node]\n"
[ERROR][2026-02-22 20:37:13] ...p/_transport.lua:36 "rpc" "yaml-language-server" "stderr" " 8: 0x1994e56 v8::internal::JSWeakCollection::Set(v8::internal::DirectHandle<v8::internal::JSWeakCollection>, v8::internal::DirectHandle<v8::internal::Object>, v8::internal::DirectHandle<v8::internal::Object>, int) [node]\n"
[ERROR][2026-02-22 20:37:13] ...p/_transport.lua:36 "rpc" "yaml-language-server" "stderr" " 9: 0x1af25a0 v8::internal::Runtime_WeakCollectionSet(int, unsigned long*, v8::internal::Isolate*) [node]\n10: 0x7f80ede36636 \n"
Looks like for whatever reason it's stuck in a loop and simply eats away at RAM until it crashes.
This is the yaml file I'm trying to edit:
# yaml-language-server: $schema=https://raw.githubusercontent.com/OAI/spec.openapis.org/refs/heads/main/oas/3.1/schema/2025-11-23
openapi: "3.1.0"
info:
version: 1.0.0
title: Minimal ping API server
paths:
/ping:
get:
responses:
"200":
description: pet response
content:
application/json:
schema:
$ref: "#/components/schemas/Pong"
components:
schemas:
# base types
Pong:
type: object
required:
- ping
properties:
ping:
type: string
example: pong
Expected Behavior
yaml-language-server autocomplete should work immediately within yaml files.
Current Behavior
It loads for a while until it runs out of memory and then crashes.
Steps to Reproduce
- Open my yaml file in nvim (LazyVim)
- Try to trigger the yaml-language-server by editing or simply saving the file
Environment
Linux (latest Tuxedo OS)
nvim 0.11.4
node v24.9.0 (also tried v25.6.1)
npm 11.6.0 (also tried 11.9.0)
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