diff --git a/.travis.yml b/.travis.yml
index 5cad7574d6..7e4339b597 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -24,12 +24,8 @@ install:
 - ./tool/install_travis.sh
 
 before_script:
-- ulimit -c unlimited -S
 - pub get
 
-after_failure:
-- ./tool/after_failure_travis.sh
-
 before_install:
   # Disable non-blocking I/O for stdout, stderr https://github.com/travis-ci/travis-ci/issues/4704#issuecomment-348435959
   - python -c 'import os,sys,fcntl; flags = fcntl.fcntl(sys.stdout, fcntl.F_GETFL); fcntl.fcntl(sys.stdout, fcntl.F_SETFL, flags&~os.O_NONBLOCK);'
diff --git a/test/model_special_cases_test.dart b/test/model_special_cases_test.dart
index 3e01d1408e..39aa012b5d 100644
--- a/test/model_special_cases_test.dart
+++ b/test/model_special_cases_test.dart
@@ -290,7 +290,7 @@ void main() {
       List<Category> packageCategories =
           packageGraphSmall.localPackages.first.categories;
       expect(packageCategories.length, equals(0));
-    });
+    }, timeout: Timeout.factor(2));
   });
 
   group('Package', () {
diff --git a/tool/after_failure_travis.sh b/tool/after_failure_travis.sh
deleted file mode 100755
index 67f6681360..0000000000
--- a/tool/after_failure_travis.sh
+++ /dev/null
@@ -1,29 +0,0 @@
-#!/bin/bash
-
-# Copyright (c) 2018, the Dart project authors.  Please see the AUTHORS file
-# for details. All rights reserved. Use of this source code is governed by a
-# BSD-style license that can be found in the LICENSE file.
-
-# Echo commands as they execute.
-set -x
-
-# Display backtrace for a single core.
-function do_core() {
-  local corefile="$1"
-
-  echo "Processing core file: $corefile"
-  gdb -c "$corefile" -ex "thread apply all bt" -ex "set pagination 0" -batch
-}
-
-# Find core files in likely locations for dartdoc.
-if uname | grep -q Linux ; then
-  COREFILES=$(find . -type f -name "core*" 2>/dev/null | egrep -v '(.yaml|.dart|.expect|.gni)$') # find core files
-  COREFILES_TMP="$(cd /tmp ; find . -type f -name "core*" 2>/dev/null | egrep -v '(.yaml|.dart|.expect|.gni)$')"
-  for f in ${COREFILES} ; do {
-    do_core "$f"
-  } ; done
-  for f in ${COREFILES_TMP} ; do {
-    do_core "/tmp/$f"
-  } ; done
-fi
-
diff --git a/tool/install_travis.sh b/tool/install_travis.sh
index 91ff42c2e7..c2aa2462d0 100755
--- a/tool/install_travis.sh
+++ b/tool/install_travis.sh
@@ -8,8 +8,6 @@
 set -x
 
 if uname | grep -q Linux ; then
-  sudo apt-get update
-  sudo apt-get install -y gdb
   sudo gem install coveralls-lcov
   coveralls-lcov --help
 fi