From fa0bba850f2c912161f22b4636297b5bcd578491 Mon Sep 17 00:00:00 2001
From: Theodore Ni <3806110+tjni@users.noreply.github.com>
Date: Fri, 6 Feb 2026 21:10:24 -0800
Subject: [PATCH] Convert worker OOM to a fatal error.

---
 packages/pyright-internal/src/pyright.ts | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/packages/pyright-internal/src/pyright.ts b/packages/pyright-internal/src/pyright.ts
index a1d95dd96906..11bcac9d30c7 100644
--- a/packages/pyright-internal/src/pyright.ts
+++ b/packages/pyright-internal/src/pyright.ts
@@ -560,6 +560,7 @@ async function runMultiThreaded(
     output: ConsoleInterface
 ) {
     const workers: ChildProcess[] = [];
+    const workersShutdown = new Set<ChildProcess>();
     const startTime = Date.now();
     const treatWarningsAsErrors = !!args.warnings;
     const exitStatus = createDeferred<ExitStatus>();
@@ -627,6 +628,7 @@ async function runMultiThreaded(
             pendingAnalysisCount++;
         } else {
             // Kill the worker since there's nothing left to do.
+            workersShutdown.add(worker);
             worker.kill();
 
             if (pendingAnalysisCount === 0) {
@@ -736,6 +738,15 @@ async function runMultiThreaded(
             exitStatus.resolve(ExitStatus.FatalError);
         });
 
+        worker.on('exit', (code, signal) => {
+            if (workersShutdown.has(worker)) {
+                return;
+            }
+
+            output.error(`Worker process exited unexpectedly: exit code=${code}, signal=${signal}`);
+            exitStatus.resolve(ExitStatus.FatalError);
+        });
+
         sendMessageToWorker(worker, 'setOptions', options);
         workers.push(worker);