Print gdb stack trace for hanging process

Author: timothyschoen

.github/workflows/cmake.yml

@@ -297,19 +297,19 @@ jobs:
     steps:
       - name: Install Dependencies (dnf)
         if: ${{ matrix.pacman == 'dnf' }}
-        run: dnf install -y git cmake alsa-lib-devel libXinerama-devel freetype-devel curl libcurl-devel wget bzip2 gcc-c++ libXi-devel libXcomposite-devel freeglut-devel libXrandr-devel libXcursor-devel xz ccache python python3-pip jack-audio-connection-kit-devel libatomic unzip ninja-build
+        run: dnf install -y gdb git cmake alsa-lib-devel libXinerama-devel freetype-devel curl libcurl-devel wget bzip2 gcc-c++ libXi-devel libXcomposite-devel freeglut-devel libXrandr-devel libXcursor-devel xz ccache python python3-pip jack-audio-connection-kit-devel libatomic unzip ninja-build
 
       - name: Install Dependencies (apt)
         if: ${{ matrix.pacman == 'apt' }}
-        run: apt update && DEBIAN_FRONTEND=noninteractive TZ="Europe/Amsterdam" apt install -y cmake git wget bzip2 build-essential libasound2-dev libjack-jackd2-dev curl libcurl4-openssl-dev libfreetype6-dev libx11-dev libxi-dev libxcomposite-dev libxcursor-dev libxcursor-dev libxext-dev libxrandr-dev libxinerama-dev ccache python3 python3-pip freeglut3-dev unzip ninja-build
+        run: apt update && DEBIAN_FRONTEND=noninteractive TZ="Europe/Amsterdam" apt install -y gdb cmake git wget bzip2 build-essential libasound2-dev libjack-jackd2-dev curl libcurl4-openssl-dev libfreetype6-dev libx11-dev libxi-dev libxcomposite-dev libxcursor-dev libxcursor-dev libxext-dev libxrandr-dev libxinerama-dev ccache python3 python3-pip freeglut3-dev unzip ninja-build
 
       - name: Install Dependencies (zypper)
         if: ${{ matrix.pacman == 'zypper' }}
-        run: zypper refresh && zypper install -y git rsync wget bzip2 xz tar cmake alsa-devel libXinerama-devel libXi-devel libcurl-devel libXcomposite-devel freeglut-devel libXrandr-devel libXcursor-devel freetype2-devel gcc gcc-c++ curl ccache python3 libjack-devel gawk unzip ninja
+        run: zypper refresh && zypper install -y gdb git rsync wget bzip2 xz tar cmake alsa-devel libXinerama-devel libXi-devel libcurl-devel libXcomposite-devel freeglut-devel libXrandr-devel libXcursor-devel freetype2-devel gcc gcc-c++ curl ccache python3 libjack-devel gawk unzip ninja
 
       - name: Install Dependencies (pacman)
         if: ${{ matrix.pacman == 'pacman' }}
-        run: pacman -Sy && pacman -S --noconfirm cmake wget bzip2 git alsa-lib freetype2 libx11 libxcursor libxi libxext libxinerama libxrandr libxrender webkit2gtk cmake make gcc pkgconf python python-pip curl ccache freeglut mesa glfw-x11 glew jack2 openssl unzip ninja && pacman --noconfirm -Syu
+        run: pacman -Sy && pacman -S --noconfirm gdb cmake wget bzip2 git alsa-lib freetype2 libx11 libxcursor libxi libxext libxinerama libxrandr libxrender webkit2gtk cmake make gcc pkgconf python python-pip curl ccache freeglut mesa glfw-x11 glew jack2 openssl unzip ninja && pacman --noconfirm -Syu
 
       - uses: actions/checkout@v4
         with:
@@ -330,6 +330,43 @@ jobs:
         working-directory: ${{github.workspace}}
         run: CXX=g++ cmake -Bbuild -GNinja -DCMAKE_C_COMPILER_LAUNCHER=ccache -DCMAKE_CXX_COMPILER_LAUNCHER=ccache -DENABLE_SFIZZ=0
 
+      - name: Build with hang detection
+        timeout-minutes: 20
+        run: |
+          # Start build
+          cmake --build . --config Debug &
+          BUILD_PID=$!
+
+          sleep 600
+
+          # Check if still running
+          if kill -0 $BUILD_PID 2>/dev/null; then
+            echo "=== BUILD APPEARS HUNG - GETTING STACK TRACE ==="
+
+            # Find the actual hanging process
+            echo "All related processes:"
+            ps aux | grep -E "(plugdata|pd|cmake)" | grep -v grep
+
+            # Try to attach to any plugdata/pd processes first
+            for pid in $(pgrep -f "plugdata|pd" 2>/dev/null || true); do
+              echo "=== Stack trace for PID $pid ==="
+              gdb -batch \
+                -ex "set pagination off" \
+                -ex "attach $pid" \
+                -ex "bt" \
+                -ex "info threads" \
+                -ex "thread apply all bt" \
+                -ex "detach" \
+                -ex "quit" 2>/dev/null || echo "Failed to attach to $pid"
+            done
+
+            # Let it continue running until timeout kills it
+            wait $BUILD_PID || true
+          else
+            echo "Build completed normally"
+            wait $BUILD_PID
+          fi
+
       - name: Build standalone
         working-directory: ${{github.workspace}}
         run: cmake --build build --target plugdata_standalone --config Release