copy the glibc fix to felt (flutter#22878)

lib/web_ui/dev/chrome.dart

@@ -4,6 +4,7 @@
 
 // @dart = 2.6
 import 'dart:async';
+import 'dart:convert';
 import 'dart:io';
 
 import 'package:pedantic/pedantic.dart';
@@ -76,7 +77,7 @@ class Chrome extends Browser {
       ];
 
       final Process process =
-          await Process.start(installation.executable, args);
+          await _spawnChromiumProcess(installation.executable, args);
 
       remoteDebuggerCompleter.complete(
           getRemoteDebuggerUrl(Uri.parse('http://localhost:${kDevtoolsPort}')));
@@ -91,3 +92,72 @@ class Chrome extends Browser {
   Chrome._(Future<Process> startBrowser(), this.remoteDebuggerUrl)
       : super(startBrowser);
 }
+
+/// Used by [Chrome] to detect a glibc bug and retry launching the
+/// browser.
+///
+/// Once every few thousands of launches we hit this glibc bug:
+///
+/// https://sourceware.org/bugzilla/show_bug.cgi?id=19329.
+///
+/// When this happens Chrome spits out something like the following then exits with code 127:
+///
+///     Inconsistency detected by ld.so: ../elf/dl-tls.c: 493: _dl_allocate_tls_init: Assertion `listp->slotinfo[cnt].gen <= GL(dl_tls_generation)' failed!
+const String _kGlibcError = 'Inconsistency detected by ld.so';
+
+Future<Process> _spawnChromiumProcess(String executable, List<String> args, { String workingDirectory }) async {
+  // Keep attempting to launch the browser until one of:
+  // - Chrome launched successfully, in which case we just return from the loop.
+  // - The tool detected an unretriable Chrome error, in which case we throw ToolExit.
+  while (true) {
+    final Process process = await Process.start(executable, args, workingDirectory: workingDirectory);
+
+    process.stdout
+      .transform(utf8.decoder)
+      .transform(const LineSplitter())
+      .listen((String line) {
+        print('[CHROME STDOUT]: $line');
+      });
+
+    // Wait until the DevTools are listening before trying to connect. This is
+    // only required for flutter_test --platform=chrome and not flutter run.
+    bool hitGlibcBug = false;
+    await process.stderr
+      .transform(utf8.decoder)
+      .transform(const LineSplitter())
+      .map((String line) {
+        print('[CHROME STDERR]:$line');
+        if (line.contains(_kGlibcError)) {
+          hitGlibcBug = true;
+        }
+        return line;
+      })
+      .firstWhere((String line) => line.startsWith('DevTools listening'), orElse: () {
+        if (hitGlibcBug) {
+          print(
+            'Encountered glibc bug https://sourceware.org/bugzilla/show_bug.cgi?id=19329. '
+            'Will try launching browser again.',
+          );
+          return null;
+        }
+        print('Failed to launch browser. Command used to launch it: ${args.join(' ')}');
+        throw Exception(
+          'Failed to launch browser. Make sure you are using an up-to-date '
+          'Chrome or Edge. Otherwise, consider using -d web-server instead '
+          'and filing an issue at https://github.com/flutter/flutter/issues.',
+        );
+      });
+
+    if (!hitGlibcBug) {
+      return process;
+    }
+
+    // A precaution that avoids accumulating browser processes, in case the
+    // glibc bug doesn't cause the browser to quit and we keep looping and
+    // launching more processes.
+    process.exitCode.timeout(const Duration(seconds: 1), onTimeout: () {
+      process.kill();
+      return null;
+    });
+  }
+}