diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index ddbfd90b776db..91a5cb3d5771a 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -131,6 +131,8 @@ jobs:
       env:
         CC: "${{ matrix.config.cc }}"
         CXX: "${{ matrix.config.cxx }}"
+        CFLAGS: "${{ matrix.config.cflags }}"
+        UBSAN_OPTIONS: "print_stacktrace=1:halt_on_error=1"
     strategy:
       matrix:
         config:
@@ -141,6 +143,7 @@ jobs:
         - {
             cc: "clang",
             cxx: "clang++",
+            clangs: "-fno-sanitize=function"
           }
     steps:
       - uses: actions/checkout@v3
diff --git a/ci/build-tumbleweed.sh b/ci/build-tumbleweed.sh
index 03e8d1ac1e558..cbd5f43c461d0 100755
--- a/ci/build-tumbleweed.sh
+++ b/ci/build-tumbleweed.sh
@@ -4,7 +4,7 @@ set -e
 meson setup build \
   --werror        \
   -Dlibplacebo:werror=false \
-  -Dc_args="-Wno-error=deprecated -Wno-error=deprecated-declarations" \
+  -Dc_args="-Wno-error=deprecated -Wno-error=deprecated-declarations $CFLAGS" \
   -Db_sanitize=address,undefined \
   -Dcdda=enabled          \
   -Ddvbin=enabled         \
@@ -16,5 +16,5 @@ meson setup build \
   -Dshaderc=enabled       \
   -Dtests=true            \
   -Dvulkan=enabled
-meson compile -C build
+ninja -C build --verbose
 ./build/mpv -v --no-config