diff --git a/tools/findbuildbotwarnings.py b/tools/findbuildbotwarnings.py
new file mode 100755
index 0000000..a172dd6
--- /dev/null
+++ b/tools/findbuildbotwarnings.py
@@ -0,0 +1,96 @@
+#!/usr/bin/env python
+#
+# Copyright (C) 2017 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""Outputs the warnings that are common to all builders.
+
+Suppressed tests that are nonetheless passing are output as warnings
+by vogar.  Any tests that generate warnings in every builder are good
+candidates for no longer being suppressed, since they're passing on
+a regular basis."""
+
+import collections
+import json
+import requests
+
+# The number of recent builds to check for each builder
+NUM_BUILDS = 5
+# The buildbot step to check for warnings
+BUILDBOT_STEP = 'test libcore'
+
+
+def main():
+    # Dict from builder+build_num combination to the list of warnings
+    # in that build
+    warnings = collections.defaultdict(list)
+    r = requests.get('https://build.chromium.org/p/client.art/json/builders')
+    if r.status_code != 200:
+        print r.text
+        return
+    builders = json.loads(r.text)
+    for builder_name in sorted(builders):
+        # Build -1 is the currently-running build (if there is one), so we
+        # start with -2, which should be the most or second-most
+        # recently-completed build.
+        for build_num in range(-2, -2 - NUM_BUILDS, -1):
+            print ('Loading data for %s, build %d...'
+                   % (builder_name, build_num))
+            r = requests.get(
+                'https://build.chromium.org/p/client.art'
+                '/json/builders/%s/builds/%d' % (
+                builder_name, build_num))
+            if r.status_code != 200:
+                print r.text
+                return
+            builder = json.loads(r.text)
+            libcore_steps = [x for x in builder['steps']
+                             if x['name'] == BUILDBOT_STEP]
+            for ls in libcore_steps:
+                stdio_logs = [x for x in ls['logs'] if x[0] == 'stdio']
+                for sl in stdio_logs:
+                    # The default link is HTML, so append /text to get the
+                    # text version
+                    r = requests.get(sl[1] + '/text')
+                    if r.status_code != 200:
+                        print r.text
+                        return
+                    stdio = r.text.splitlines()
+
+                    # Walk from the back of the list to find the start of the
+                    # warnings summary
+                    i = -1
+                    try:
+                        while not stdio[i].startswith('Warnings summary:'):
+                            i -= 1
+                        i += 1   # Ignore the "Warnings summary:" line
+                        while i < -1:
+                            warnings['%s:%d' % (builder_name, build_num)].append(stdio[i])
+                            i += 1
+                    except IndexError:
+                        # Some builds don't have any
+                        print '  No warnings section found.'
+    # sharedwarnings will build up the intersection of all the lists of
+    # warnings.  We seed it with an arbitrary starting point (which is fine
+    # since intersection is commutative).
+    sharedwarnings = set(warnings.popitem()[1])
+    for warning_list in warnings.itervalues():
+        sharedwarnings = sharedwarnings & set(warning_list)
+    print 'Warnings shared across all builders:'
+    for warning in sorted(list(sharedwarnings)):
+        print warning
+
+
+if __name__ == '__main__':
+    main()