diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 0cf18d228..d268aa0cb 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -80,7 +80,7 @@ jobs:
       - name: Install deps
         run: |
           source ./util/ci/common.sh
-          install_linux_deps clang-3.9
+          install_linux_deps clang-3.9 gdb
 
       - name: Build
         run: |
@@ -89,10 +89,14 @@ jobs:
           CC: clang-3.9
           CXX: clang++-3.9
 
-      - name: Test
+      - name: Unittest
         run: |
           ./bin/minetest --run-unittests
 
+      - name: Integration test
+        run: |
+          ./util/test_multiplayer.sh
+
   # This is the current clang version
   clang_9:
     runs-on: ubuntu-18.04
diff --git a/util/ci/common.sh b/util/ci/common.sh
index 1083581b5..eb282c823 100644
--- a/util/ci/common.sh
+++ b/util/ci/common.sh
@@ -11,7 +11,9 @@ install_linux_deps() {
 		shift
 		pkgs+=(libirrlicht-dev)
 	else
-		wget "https://github.com/minetest/irrlicht/releases/download/1.9.0mt1/ubuntu-bionic.tar.gz"
+		# TODO: return old URL when IrrlichtMt 1.9.0mt2 is tagged
+		#wget "https://github.com/minetest/irrlicht/releases/download/1.9.0mt1/ubuntu-bionic.tar.gz"
+		wget "http://minetest.kitsunemimi.pw/irrlichtmt-patched-temporary.tgz" -O ubuntu-bionic.tar.gz
 		sudo tar -xaf ubuntu-bionic.tar.gz -C /usr/local
 	fi
 
diff --git a/util/test_multiplayer.sh b/util/test_multiplayer.sh
index 176cf11d9..9fb894a30 100755
--- a/util/test_multiplayer.sh
+++ b/util/test_multiplayer.sh
@@ -3,41 +3,58 @@ dir="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
 gameid=devtest
 minetest=$dir/../bin/minetest
 testspath=$dir/../tests
-worldpath=$testspath/testworld_$gameid
-configpath=$testspath/configs
-logpath=$testspath/log
-conf_server=$configpath/minetest.conf.multi.server
-conf_client1=$configpath/minetest.conf.multi.client1
-conf_client2=$configpath/minetest.conf.multi.client2
-log_server=$logpath/server.log
-log_client1=$logpath/client1.log
-log_client2=$logpath/client2.log
+conf_client1=$testspath/client1.conf
+conf_server=$testspath/server.conf
+worldpath=$testspath/world
 
-mkdir -p $worldpath
-mkdir -p $configpath
-mkdir -p $logpath
+waitfor () {
+	n=30
+	while [ $n -gt 0 ]; do
+		[ -f "$1" ] && return 0
+		sleep 0.5
+		((n-=1))
+	done
+	echo "Waiting for ${1##*/} timed out"
+	pkill -P $$
+	exit 1
+}
 
-echo -ne 'client1::shout,interact,settime,teleport,give
-client2::shout,interact,settime,teleport,give
-' > $worldpath/auth.txt
+gdbrun () {
+	gdb -q -ex 'set confirm off' -ex 'r' -ex 'bt' -ex 'quit' --args "$@"
+}
 
-echo -ne '' > $conf_server
+[ -e $minetest ] || { echo "executable $minetest missing"; exit 1; }
 
-echo -ne '# client 1 config
-screenW=500
-screenH=380
-name=client1
-viewing_range_nodes_min=10
-' > $conf_client1
+rm -rf $worldpath
+mkdir -p $worldpath/worldmods/test
 
-echo -ne '# client 2 config
-screenW=500
-screenH=380
-name=client2
-viewing_range_nodes_min=10
-' > $conf_client2
+printf '%s\n' >$testspath/client1.conf \
+	video_driver=null name=client1 viewing_range=10 \
+	enable_{sound,minimap,shaders}=false
 
-echo $(sleep 1; $minetest --disable-unittests --logfile $log_client1 --config $conf_client1 --go --address localhost) &
-echo $(sleep 2; $minetest --disable-unittests --logfile $log_client2 --config $conf_client2 --go --address localhost) &
-$minetest --disable-unittests --server --logfile $log_server --config $conf_server --world $worldpath --gameid $gameid
+printf '%s\n' >$testspath/server.conf \
+	max_block_send_distance=1
 
+cat >$worldpath/worldmods/test/init.lua <<"LUA"
+core.after(0, function()
+	io.close(io.open(core.get_worldpath() .. "/startup", "w"))
+end)
+core.register_on_joinplayer(function(player)
+	io.close(io.open(core.get_worldpath() .. "/player_joined", "w"))
+	core.request_shutdown("", false, 2)
+end)
+LUA
+
+echo "Starting server"
+gdbrun $minetest --server --config $conf_server --world $worldpath --gameid $gameid 2>&1 | sed -u 's/^/(server) /' &
+waitfor $worldpath/startup
+
+echo "Starting client"
+gdbrun $minetest --config $conf_client1 --go --address 127.0.0.1 2>&1 | sed -u 's/^/(client) /' &
+waitfor $worldpath/player_joined
+
+echo "Waiting for client and server to exit"
+wait
+
+echo "Success"
+exit 0