我得到一个anr，从anr跟踪来看，主线程是正常的
"main" prio=5 tid=1 Native
| group="main" sCount=1 dsCount=0 obj=0x7507a710 self=0x7fae13ba00
| sysTid=12991 nice=0 cgrp=default sched=0/0 handle=0x7fb1746fe8
| state=S schedstat=( 523201194870 224815705819 1167733 ) utm=35431 stm=16889 core=2 HZ=100
| stack=0x7fc88a6000-0x7fc88a8000 stackSize=8MB
| held mutexes=
kernel: __switch_to+0x7c/0x88
kernel: SyS_epoll_wait+0x2cc/0x384
kernel: SyS_epoll_pwait+0x9c/0x114
kernel: el0_svc_naked+0x20/0x28
native: #00 pc 0000000000068374 /system/lib64/libc.so (__epoll_pwait+8)
native: #01 pc 000000000001f3a4 /system/lib64/libc.so (epoll_pwait+32)
native: #02 pc 000000000001be88 /system/lib64/libutils.so (_ZN7android6Looper9pollInnerEi+144)
native: #03 pc 000000000001c268 /system/lib64/libutils.so (_ZN7android6Looper8pollOnceEiPiS1_PPv+80)
native: #04 pc 00000000000d73a8 /system/lib64/libandroid_runtime.so (_ZN7android18NativeMessageQueue8pollOnceEP7_JNIEnvP8_jobjecti+48)
native: #05 pc 000000000000087c /system/framework/arm64/boot.oat (Java_android_os_MessageQueue_nativePollOnce__JI+144)
at android.os.MessageQueue.nativePollOnce(Native …