Fixes #27665: Let the search process never inherit `process.execArgv`

src/vs/base/parts/ipc/node/ipc.cp.ts

@@ -56,6 +56,14 @@ export interface IIPCOptions {
 	 */
 	debugBrk?: number;
 
+	/**
+	 * See https://github.com/Microsoft/vscode/issues/27665
+	 * Allows to pass in fresh execArgv to the forked process such that it doesn't inherit them from `process.execArgv`.
+	 * e.g. Launching the extension host process with `--debug-brk=xxx` and then forking a process from the extension host
+	 * results in the forked process inheriting `--debug-brk=xxx`.
+	 */
+	freshExecArgv?: boolean;
+
 	/**
 	 * Enables our createQueuedSender helper for this Client. Uses a queue when the internal Node.js queue is
 	 * full of messages - see notes on that method.
@@ -125,6 +133,10 @@ export class Client implements IChannelClient, IDisposable {
 				forkOpts.env = assign(forkOpts.env, this.options.env);
 			}
 
+			if (this.options && this.options.freshExecArgv) {
+				forkOpts.execArgv = [];
+			}
+
 			if (this.options && typeof this.options.debug === 'number') {
 				forkOpts.execArgv = ['--nolazy', '--debug=' + this.options.debug];
 			}

src/vs/workbench/services/search/node/searchService.ts

@@ -207,6 +207,11 @@ export class DiskSearch {
 				serverName: 'Search',
 				timeout: timeout,
 				args: ['--type=searchService'],
+				// See https://github.com/Microsoft/vscode/issues/27665
+				// Pass in fresh execArgv to the forked process such that it doesn't inherit them from `process.execArgv`.
+				// e.g. Launching the extension host process with `--debug-brk=xxx` and then forking a process from the extension host
+				// results in the forked process inheriting `--debug-brk=xxx`.
+				freshExecArgv: true,
 				env: {
 					AMD_ENTRYPOINT: 'vs/workbench/services/search/node/searchApp',
 					PIPE_LOGGING: 'true',