diff --git a/lib/util/devutil.js b/lib/util/devutil.js
index a16da2e9..45ec7a7d 100644
--- a/lib/util/devutil.js
+++ b/lib/util/devutil.js
@@ -57,12 +57,12 @@ devutil.waitForPort = function(adb, serial, port) {
     })
 }
 
-devutil.killProcsByComm = function(adb, serial, comm, bin) {
+devutil.listPidsByComm = function(adb, serial, comm, bin) {
   return adb.shellAsync(serial, ['ps', comm])
     .then(function(out) {
       return new Promise(function(resolve, reject) {
         var header = false
-          , killables = []
+          , pids = []
         out.pipe(split())
           .on('data', function(chunk) {
             if (header) {
@@ -71,27 +71,48 @@ devutil.killProcsByComm = function(adb, serial, comm, bin) {
             else {
               var cols = chunk.toString().split(/\s+/)
               if (cols.pop() === bin) {
-                killables.push(cols[1])
+                pids.push(+cols[1])
               }
             }
           })
           .on('end', function() {
-            resolve(killables)
+            resolve(pids)
           })
       })
     })
-    .then(function(killables) {
-      if (killables.length) {
-        return adb.shellAsync(serial, ['kill'].concat(killables))
-          .then(function(out) {
-            return new Promise(function(resolve, reject) {
-              out.on('end', resolve)
-            })
-          })
+}
+
+devutil.waitForProcsToDie = function(adb, serial, comm, bin) {
+  return devutil.listPidsByComm(adb, serial, comm, bin)
+    .then(function(pids) {
+      if (pids.length) {
+        return devutil.waitForProcsToDie(adb, serial, comm, bin)
       }
     })
 }
 
+devutil.killProcsByComm = function(adb, serial, comm, bin, mode) {
+  return devutil.listPidsByComm(adb, serial, comm, bin, mode)
+    .then(function(pids) {
+      if (!pids.length) {
+        return Promise.resolve()
+      }
+      return adb.shellAsync(serial, ['kill', mode || -15].concat(pids))
+        .then(function(out) {
+          return new Promise(function(resolve, reject) {
+            out.on('end', resolve)
+          })
+        })
+        .then(function() {
+          return devutil.waitForProcsToDie(adb, serial, comm, bin)
+        })
+        .timeout(1000)
+        .then(function() {
+          return devutil.killProcsByComm(adb, serial, comm, bin, -9)
+        })
+    })
+}
+
 devutil.startProp = function(adb, serial, cmd) {
   return adb.openTcpAsync(options.serial, port)
     .then(function(conn) {