diff --git a/testing/scripts/invoke_qemu.sh b/testing/scripts/invoke_qemu.sh
index e4b64a47..6f9364e6 100755
--- a/testing/scripts/invoke_qemu.sh
+++ b/testing/scripts/invoke_qemu.sh
@@ -100,7 +100,6 @@ main() {
 
     qemu-system-${arch} \
         -nographic -m 1G \
-        -smp 8 \
         -kernel $kernel \
         -initrd $initramfs \
         -append "$bootparams" \
diff --git a/testing/testrunner/main.go b/testing/testrunner/main.go
index f0c13232..a410b5e4 100644
--- a/testing/testrunner/main.go
+++ b/testing/testrunner/main.go
@@ -11,9 +11,17 @@ package main
 
 import (
 	"fmt"
+	"os"
 )
 
 func main() {
+	cpus, err := os.ReadFile("/sys/devices/system/cpu/possible")
+	if err != nil {
+		panic(err)
+	}
+	fmt.Printf("possible cpus: %v\n", string(cpus))
+	os.Exit(1)
+
 	RunEventsTest(TestFeaturesCorrect)
 	RunEventsTest(TestForkExit, "--process-fork")
 	RunEventsTest(TestForkExec, "--process-fork", "--process-exec")