diff --git a/.github/workflows/analyze.yaml b/.github/workflows/analyze.yaml
new file mode 100644
index 000000000..73859618d
--- /dev/null
+++ b/.github/workflows/analyze.yaml
@@ -0,0 +1,13 @@
+name: ubsan-unit-tests
+on: [push]
+jobs:
+  build:
+    runs-on: rtx6000-4x
+    steps:
+      - uses: actions/checkout@v2
+      - name: configure
+        run: |
+          cd lib && ./configure --enable-sm80 --disable-openmp && cd ..
+      - name: analyze
+        run: |
+          cd lib && scan-build -o ../_analyze --use-cc clang make
diff --git a/.github/workflows/coverage.yaml b/.github/workflows/coverage.yaml
new file mode 100644
index 000000000..c8edc3546
--- /dev/null
+++ b/.github/workflows/coverage.yaml
@@ -0,0 +1,16 @@
+name: ubsan-unit-tests
+on: [push]
+jobs:
+  build:
+    runs-on: rtx6000-4x
+    steps:
+      - uses: actions/checkout@v2
+      - name: configure & build
+        run: |
+          cd lib && ./configure --enable-sm80 && cd ..
+          make -j 64 -C test COVER=1 all.tests
+      - name: tests
+        run: |
+          make -C test check
+      - name: coverage report
+          cd test && ./cover-gen.rb ../_coverage
diff --git a/.github/workflows/cuda-int-tests.yaml b/.github/workflows/cuda-int-tests.yaml
index 755bd9731..f72b6ced6 100644
--- a/.github/workflows/cuda-int-tests.yaml
+++ b/.github/workflows/cuda-int-tests.yaml
@@ -8,7 +8,7 @@ jobs:
       - name: configure & build
         run: |
           cd lib && ./configure --enable-sm80 && cd ..
-          make -j 32 -C test/int/nnc
+          make -j 64 -C test/int/nnc
       - name: integration tests
         run: |
           make -C test/int/nnc test
diff --git a/.github/workflows/macos-unit-tests.yaml b/.github/workflows/macos-unit-tests.yaml
index bacebe3df..3553d7877 100644
--- a/.github/workflows/macos-unit-tests.yaml
+++ b/.github/workflows/macos-unit-tests.yaml
@@ -2,7 +2,7 @@ name: macos-unit-tests
 on: [push]
 jobs:
   build:
-    runs-on: macos-12
+    runs-on: macos-latest
     steps:
       - uses: actions/checkout@v2
       - name: Install libjpeg and libpng
diff --git a/.github/workflows/undef-unit-tests.yaml b/.github/workflows/ubsan-unit-tests.yaml
similarity index 56%
rename from .github/workflows/undef-unit-tests.yaml
rename to .github/workflows/ubsan-unit-tests.yaml
index f3d22b9ad..6dd8303cf 100644
--- a/.github/workflows/undef-unit-tests.yaml
+++ b/.github/workflows/ubsan-unit-tests.yaml
@@ -1,4 +1,4 @@
-name: undef-unit-tests
+name: ubsan-unit-tests
 on: [push]
 jobs:
   build:
@@ -8,11 +8,11 @@ jobs:
       - name: configure & build
         run: |
           cd lib && ./configure --enable-sm80 && cd ..
-          make -j 32 -C lib undef
-          make -j 32 -C bin undef
-          make -j 32 -C bin/nnc undef
-          make -j 32 -C bin/cuda undef
-          make -j 32 -C test undef
+          make -j 64 -C lib ubsan
+          make -j 64 -C bin ubsan
+          make -j 64 -C bin/nnc ubsan
+          make -j 64 -C bin/cuda ubsan
+          make -j 64 -C test ubsan
       - name: tests
         run: |
           make -C test test
diff --git a/lib/scheme.mk b/lib/scheme.mk
index a93af3c8b..6370649f3 100644
--- a/lib/scheme.mk
+++ b/lib/scheme.mk
@@ -32,18 +32,18 @@ asan: all
 
 # Undefined Scheme
 
-UNDEF ?= 0
-ifeq ($(UNDEF), 1)
+UBSAN ?= 0
+ifeq ($(UBSAN), 1)
 	CFLAGS += -g -fno-omit-frame-pointer -O0 -fsanitize=address -fsanitize=undefined
 	NVFLAGS += -g -O0
 	LDFLAGS += -g -fno-omit-frame-pointer -O0 -fsanitize=address -fsanitize=undefined
 endif
 
-undef: CFLAGS += -g -fno-omit-frame-pointer -O0 -fsanitize=address -fsanitize=undefined
-undef: NVFLAGS += -g -O0
-undef: LDFLAGS += -g -fno-omit-frame-pointer -O0 -fsanitize=address -fsanitize=undefined
-undef: export UNDEF = 1
-undef: all
+ubsan: CFLAGS += -g -fno-omit-frame-pointer -O0 -fsanitize=address -fsanitize=undefined
+ubsan: NVFLAGS += -g -O0
+ubsan: LDFLAGS += -g -fno-omit-frame-pointer -O0 -fsanitize=address -fsanitize=undefined
+ubsan: export UBSAN = 1
+ubsan: all
 
 # Coverage Scheme