diff --git a/buildbot/osuosl/master/config/builders.py b/buildbot/osuosl/master/config/builders.py
--- a/buildbot/osuosl/master/config/builders.py
+++ b/buildbot/osuosl/master/config/builders.py
@@ -1357,6 +1357,15 @@
 
 # libc Builders.
 
+    {'name' : 'libc-aarch64-ubuntu-dbg',
+    'tags'  : ["libc"],
+    'workernames' : ['libc-aarch64-ubuntu'],
+    'builddir': 'libc-aarch64-ubuntu',
+    'factory' : AnnotatedBuilder.getAnnotatedBuildFactory(
+                    script="libc-linux.py",
+                    depends_on_projects=['llvm', 'libc', 'clang', 'clang-tools-extra'],
+                    extra_args=['--debug'])},
+
     {'name' : 'libc-x86_64-debian',
     'tags'  : ["libc"],
     'workernames' : ['libc-x86_64-debian'],
diff --git a/buildbot/osuosl/master/config/status.py b/buildbot/osuosl/master/config/status.py
--- a/buildbot/osuosl/master/config/status.py
+++ b/buildbot/osuosl/master/config/status.py
@@ -211,7 +211,7 @@
         subject = "Build %(builder)s Failure",
         mode = "failing",
         builders = ["libc-x86_64-debian", "libc-x86_64_debian-dbg",
-                    "libc-x86_64-debian-dbg-asan"]),
+                    "libc-x86_64-debian-dbg-asan", "libc-aarch64-ubuntu-dbg"]),
     reporters.MailNotifier(
         fromaddr = "llvm.buildmaster@lab.llvm.org",
         sendToInterestedUsers = False,
diff --git a/buildbot/osuosl/master/config/workers.py b/buildbot/osuosl/master/config/workers.py
--- a/buildbot/osuosl/master/config/workers.py
+++ b/buildbot/osuosl/master/config/workers.py
@@ -162,6 +162,9 @@
         # Debian x86_64 Buster Xeon(R) Gold 6154 CPU @ 3.00GHz, 192GB RAM
         create_worker("lldb-x86_64-debian", properties={'jobs': 72}, max_builds=1),
 
+        # Ubuntu aarch64 128 CPUs, 125 GB RAM
+        create_worker("libc-aarch64-ubuntu", properties={'jobs': 32}, max_builds=2),
+
         # Debian x86_64 Intel Broadwell 32 CPUs, 120 GB RAM
         create_worker("libc-x86_64-debian", properties={'jobs': 32}, max_builds=2),