Refactors timeouts to print stack traces

.github/workflows/build.yml

@@ -99,9 +99,31 @@ jobs:
         echo "Note: output is supressed due to length. See build artifacts for full logs."
         echo "Running..."
 
-        # Capture GDB output (15 minute timeout)
-        gdb_output=$(timeout 900 gdb -batch -ex run -ex backtrace --args ./amalgam${{ matrix.amlg-postfix }} --debug-internal-memory tic_tac_toe_evolver.amlg -target-time 300)
+        # Run Evolver with GDB
+        # However, sent a SIGINT after 6 minutes (indicating a hanging Evolver) to get a stacktrace
+        TIMEOUT=360
+
+        # Run GDB in the background
+        gdb_output_file=$(mktemp)
+        if [[ "${{ matrix.amlg-postfix }}" == *"mt"* ]]; then
+          gdb -batch -ex run -ex "thread apply all bt" --args ./amalgam${{ matrix.amlg-postfix }} --debug-internal-memory tic_tac_toe_evolver.amlg -target-time 300 > "$gdb_output_file" 2>&1 &
+          GDB_PID=$!
+        else
+          gdb -batch -ex run -ex bt --args ./amalgam${{ matrix.amlg-postfix }} --debug-internal-memory tic_tac_toe_evolver.amlg -target-time 300 > "$gdb_output_file" 2>&1 &
+          GDB_PID=$!
+        fi
+
+        echo "GDB PID: $GDB_PID"
+
+        # Set up a timer to send SIGINT to GDB after the timeout
+        {
+            sleep $TIMEOUT
+            kill -SIGINT $GDB_PID
+        } &
+        wait $GDB_PID
         gdb_exit_code=$?
+        gdb_output=$(cat "$gdb_output_file")
+        # Save output to logs.txt, uploaded later
         echo "$gdb_output" >> logs.txt
 
         # Evaluate GDB exit code and exit this workflow accordingly
@@ -117,7 +139,7 @@ jobs:
           fi
         else
           # If GDB exited with code 0, there was a segfault
-          echo "$gdb_output" | tail -n 200
+          echo "$gdb_output" | tail -n 400
           exit 139
         fi