利用NDK做开发，因为各种原因的不小心，导致了闪退问题，没有stack的话，很难查到问题的所在。这时候ndk-stack出场了。

先看看如下DUMP信息：

********** Crash dump: **********

Build fingerprint: 'OPPO/A33/A33:5.1.1/LMY47V/1390465867:user/release-keys'

pid: , tid: , name: Thread-  >>> com.example.dctool <<<

signal  (SIGSEGV), code  (SEGV_MAPERR), fault addr 0xdeadbaad

Stack frame # pc 00028f20  /system/lib/libc.so (dlfree+)

Stack frame # pc 0000f3e3  /system/lib/libc.so (free+)

Stack frame # pc 000559e3  /data/app/com.example.dctool-/lib/arm/libunisdkdctool.so (unisdk::NtExecutor::ntPost(char const*, char const*, int)+): Routine ??

??:

Stack frame # pc 00056d9f  /data/app/com.example.dctool-/lib/arm/libunisdkdctool.so (unisdk::NtExecutor::ntUploadInfo()+): Routine ??

??:

Stack frame # pc 00059f3f  /data/app/com.example.dctool-/lib/arm/libunisdkdctool.so (unisdk::Tobserver::OnPingNotify(unisdk::PingRet&)+): Routine ??

??:

Stack frame # pc   /data/app/com.example.dctool-/lib/arm/libunisdkdctool.so (unisdk::ntping::statistics()+): Routine ??

??:

Stack frame # pc 000585ed  /data/app/com.example.dctool-/lib/arm/libunisdkdctool.so (unisdk::ntping::recv_packet()+): Routine ??

??:

Stack frame # pc 000585dd  /data/app/com.example.dctool-/lib/arm/libunisdkdctool.so (unisdk::ntping::recv_packet()+): Routine ??

??:

Stack frame # pc 000585dd  /data/app/com.example.dctool-/lib/arm/libunisdkdctool.so (unisdk::ntping::recv_packet()+): Routine ??

??:

Stack frame # pc 000585dd  /data/app/com.example.dctool-/lib/arm/libunisdkdctool.so (unisdk::ntping::recv_packet()+): Routine ??

??:

Stack frame # pc   /data/app/com.example.dctool-/lib/arm/libunisdkdctool.so (unisdk::ntping::ping(int, int)+): Routine ??

??:

Stack frame # pc 00054bad  /data/app/com.example.dctool-/lib/arm/libunisdkdctool.so (unisdk::NtExecutor::ntPingBaidu()+): Routine ??

??:

Stack frame # pc 00059f6f  /data/app/com.example.dctool-/lib/arm/libunisdkdctool.so (unisdk::Tobserver::OnPingNotify(unisdk::PingRet&)+): Routine ??

??:

Stack frame # pc   /data/app/com.example.dctool-/lib/arm/libunisdkdctool.so (unisdk::ntping::statistics()+): Routine ??

??:

Stack frame # pc 000585ed  /data/app/com.example.dctool-/lib/arm/libunisdkdctool.so (unisdk::ntping::recv_packet()+): Routine ??

??:

Stack frame # pc 000585dd  /data/app/com.example.dctool-/lib/arm/libunisdkdctool.so (unisdk::ntping::recv_packet()+): Routine ??

??:

Stack frame # pc 000585dd  /data/app/com.example.dctool-/lib/arm/libunisdkdctool.so (unisdk::ntping::recv_packet()+): Routine ??

??:

Stack frame # pc 000585dd  /data/app/com.example.dctool-/lib/arm/libunisdkdctool.so (unisdk::ntping::recv_packet()+): Routine ??

??:

Stack frame # pc   /data/app/com.example.dctool-/lib/arm/libunisdkdctool.so (unisdk::ntping::ping(int, int)+): Routine ??

??:

Stack frame # pc 000547c1  /data/app/com.example.dctool-/lib/arm/libunisdkdctool.so (unisdk::NtExecutor::ntPingQQ()+): Routine ??

??:

Stack frame # pc 00059edf  /data/app/com.example.dctool-/lib/arm/libunisdkdctool.so (unisdk::Tobserver::OnPingNotify(unisdk::PingRet&)+): Routine ??

??:

Stack frame # pc   /data/app/com.example.dctool-/lib/arm/libunisdkdctool.so (unisdk::ntping::statistics()+): Routine ??

??:

Stack frame # pc 000585ed  /data/app/com.example.dctool-/lib/arm/libunisdkdctool.so (unisdk::ntping::recv_packet()+): Routine ??

??:

Stack frame # pc 000585dd  /data/app/com.example.dctool-/lib/arm/libunisdkdctool.so (unisdk::ntping::recv_packet()+): Routine ??

??:

Stack frame # pc 000585dd  /data/app/com.example.dctool-/lib/arm/libunisdkdctool.so (unisdk::ntping::recv_packet()+): Routine ??

??:

Stack frame # pc 000585dd  /data/app/com.example.dctool-/lib/arm/libunisdkdctool.so (unisdk::ntping::recv_packet()+): Routine ??

??:

Stack frame # pc   /data/app/com.example.dctool-/lib/arm/libunisdkdctool.so (unisdk::ntping::ping(int, int)+): Routine ??

??:

Stack frame # pc   /data/app/com.example.dctool-/lib/arm/libunisdkdctool.so (unisdk::NtExecutor::ntPing163()+): Routine ??

??:

Stack frame # pc 0005aa31  /data/app/com.example.dctool-/lib/arm/libunisdkdctool.so (unisdk::Tobserver::OnHttpNotify(unisdk::HttpRet&)+): Routine ??

??:

Stack frame # pc 000552a3  /data/app/com.example.dctool-/lib/arm/libunisdkdctool.so (unisdk::NtExecutor::ntHead(char const*, int)+): Routine ??

??:

Stack frame # pc 0005aab1  /data/app/com.example.dctool-/lib/arm/libunisdkdctool.so (unisdk::Tobserver::OnHttpNotify(unisdk::HttpRet&)+): Routine ??

??:

Stack frame # pc 000552a3  /data/app/com.example.dctool-/lib/arm/libunisdkdctool.so (unisdk::NtExecutor::ntHead(char const*, int)+): Routine ??

??:

Stack frame # pc 0005a9db  /data/app/com.example.dctool-/lib/arm/libunisdkdctool.so (unisdk::Tobserver::OnHttpNotify(unisdk::HttpRet&)+): Routine ??

??:

Stack frame # pc 000552a3  /data/app/com.example.dctool-/lib/arm/libunisdkdctool.so (unisdk::NtExecutor::ntHead(char const*, int)+): Routine ??

??:

Stack frame # pc 0005ac51  /data/app/com.example.dctool-/lib/arm/libunisdkdctool.so (unisdk::Tobserver::OnHttpNotify(unisdk::HttpRet&)+): Routine ??

??:

Stack frame # pc 000556e9  /data/app/com.example.dctool-/lib/arm/libunisdkdctool.so (unisdk::NtExecutor::ntGet(char const*, int, int)+): Routine ??

??:

Stack frame # pc 0005ada3  /data/app/com.example.dctool-/lib/arm/libunisdkdctool.so (unisdk::Tobserver::OnHttpNotify(unisdk::HttpRet&)+): Routine ??

??:

Stack frame # pc 000556e9  /data/app/com.example.dctool-/lib/arm/libunisdkdctool.so (unisdk::NtExecutor::ntGet(char const*, int, int)+): Routine ??

??:

Stack frame # pc 0005b6e7  /data/app/com.example.dctool-/lib/arm/libunisdkdctool.so (unisdk::nttool::ntStartExecute(void*)+): Routine ??

??:

Stack frame # pc 000134a3  /system/lib/libc.so (__pthread_start(void*)+)

Stack frame # pc 000114a7  /system/lib/libc.so (__start_thread+)

上面的信息是ndk-stack解析出来的信息，使用命令如下：

adb logcat | $NDK_HOME/ndk-stack -sym $PROJECT/libs/armeabi

其中，$PROJECT/libs/armeabi是so的路径。

解析出来的stack顶部地址，便是引发crash的代码行，可以利用addr2line做进一步的分析，查出引发crash的API，使用如下：

arm-linux-androideabi-addr2line -a 000556ff -e libunisdkdctool.so -f -C

打完收工！

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