请教各位大神，跑 monkey 时出现 killed 是什么原因？该如何处理？

:Monkey: seed=1502679782184 count=1000
:AllowPackage: com.tencent.mobileqq
:IncludeCategory: android.intent.category.LAUNCHER
:IncludeCategory: android.intent.category.MONKEY
// Event percentages:
// 0: 15.0%
// 1: 10.0%
// 2: 2.0%
// 3: 15.0%
// 4: -0.0%
// 5: -0.0%
// 6: 25.0%
// 7: 15.0%
// 8: 2.0%
// 9: 2.0%
// 10: 1.0%
// 11: 13.0%
:Switch: #Intent;action=android.intent.action.MAIN;category=android.intent.categ
ory.LAUNCHER;launchFlags=0x10200000;component=com.tencent.mobileqq/.activity.Spl
ashActivity;end
// Allowing start of Intent { act=android.intent.action.MAIN cat=[android.in
tent.category.LAUNCHER] cmp=com.tencent.mobileqq/.activity.SplashActivity } in p
ackage com.tencent.mobileqq
// Allowing start of Intent { act=android.intent.action.MAIN cat=[android.in
tent.category.LAUNCHER] cmp=com.tencent.mobileqq/.activity.SplashActivity } in p
ackage com.tencent.mobileqq
:Sending rotation degree=0, persist=false
Killed