Try using SIGUSR2 instead of SIGKILL for CI to work?

tests/client_connectivity_test.go

@@ -5,6 +5,7 @@ import (
 	"net/http"
 	"os"
 	"os/exec"
+	"strconv"
 	"sync"
 	"sync/atomic"
 	"testing"
@@ -125,13 +126,12 @@ func TestSigkillBeforeKeysUploadResponse(t *testing.T) {
 				terminateClient = func() {
 					terminated.Store(true)
 					t.Logf("got keys/upload: terminating process %v", cmd.Process.Pid)
-					if err := cmd.Process.Kill(); err != nil {
+					kill := exec.Command("kill", "-USR2", strconv.Itoa(cmd.Process.Pid))
+					t.Logf(kill.String())
+					if err := kill.Run(); err != nil {
 						t.Errorf("failed to kill process: %s", err)
 						return
 					}
-					if err := cmd.Wait(); err != nil {
-						t.Logf("error waiting for process to quit: %v", err)
-					}
 					t.Logf("terminated process")
 					waiter.Finish()
 				}

tests/templates/sigkill_before_keys_upload_response.go

@@ -3,6 +3,8 @@ package main
 import (
 	"fmt"
 	"os"
+	"os/signal"
+	"syscall"
 	"time"
 
 	"github.com/matrix-org/complement-crypto/internal/api"
@@ -24,7 +26,18 @@ func (t *MockT) Fatalf(f string, args ...any) {
 }
 func (t *MockT) Name() string { return "inline_script" }
 
+func ProcessSignal() {
+	sigch := make(chan os.Signal, 2)
+	signal.Notify(sigch, syscall.SIGUSR2)
+	for {
+		signalType := <-sigch
+		fmt.Println("Received signal SIGUSR2 from channel : ", signalType)
+		panic("terminating...")
+	}
+}
+
 func main() {
+	go ProcessSignal()
 	time.Sleep(time.Second)
 	t := &MockT{}
 	cfg := api.ClientCreationOpts{