BKSDisplayServices assert exception occur when hook objc_msgSend

[everettjf]

Hi, I'm using the latest code in master (commit no: f2adeae ) for AppleTrace.

For reproduct the assert exception in BKSDisplayServices , please follow the 3 steps below:

1. git clone git@github.com:everettjf/AppleTrace.git
   git checkout crash

2. Open AppleTrace/sample/TraceAllMsgDemo/TraceAllMsgDemo.xcodeproj

3. Connect arm64 device, command+r run.

Then assert exception occur : ( it is a assert BKSDisplayServices assert)

2018-10-28 17:44:31.651408+0800 TraceAllMsgDemo[21902:2695316] *** Assertion failure in Boolean BKSDisplayServicesStart(void)(), /BuildRoot/Library/Caches/com.apple.xbs/Sources/BackBoardServicesFramework/backboarddaemon-195.45.7/BackBoardServices/BKSDisplayServices.m:48

[kobe1941]

我也遇到了类似的问题，hook objc_msgSend这个函数的时候，腾讯体育的播放器在播放视频的时候会崩溃（非播放视频的时候不会崩溃，当然log太多会卡住Xcode），SIGBORT。注释掉hook的这一行就没问题，可以继续看视频。