求解决：低版本系统（低于android 8），导出trace时会有bad atrace打印，同样的apk在Android 8以上没有该问题，可以正常抓取trace；检查过apk，有正常插桩

btrace版本：2.0.0
PC：iMac 13.5.2
jdk：Java 8
调试设备：Android 7.1.2 （Android 4.4 6.0.1谷歌手机也是类似的情况）

apk插桩成功，能够正常的抓取trace，但是stop tracing时，解析atrace失败

查看pb文件，也是不完整的

Reproduce the stop-tracing failure on Android 7.1.2 or another pre-Android 8 device, using the reported btrace 2.0.0 setup, and compare it with Android 8+. Start at the atrace parsing step after tracing stops and inspect the incomplete pb output shown in the report. Done means older Android versions produce a complete parsed trace without the bad atrace output.

Written by the indexing model from the issue text.