总是难免遇到一些crash 的问题，掌握一些常用命令，可以快速定位问题，免去重复复制问题。
1.首先我们会拿到crash 的stack info以及backtrace.
09-14 09:38:22.018 364 1748 D audiohal_stream_offload: qz = 0 readAddr = 0xf23d8906 writeSize = 2246 sizeRemain = 30522
--------- beginning of crash
09-14 09:38:22.018 364 1748 F libc : Fatal signal 7 (SIGBUS), code 1 (BUS_ADRALN), fault addr 0xf23d8912 in tid 1748 (writer), pid 364 (audio.service)
01-01 00:03:57.532 1749 1749 W AUD[0] thread: start
01-01 00:03:57.544 316 316 E : {MENU}DEC2 Codec=3
09-14 09:38:22.058 1752 1752 I crash_dump32: obtaining output fd from tombstoned, type: kDebuggerdTombstoneProto
09-14 09:38:22.059 262 262 I tombstoned: received crash request for pid 1748
09-14 09:38:22.059 1752 1752 I crash_dump32: performing dump of process 364 (target tid = 1748)
09-14 09:38:22.064 1752 1752 E DEBUG : failed to read /proc/uptime: Permission denied
01-01 00:03:57.561 0 0 F