I am stuck with my app, as I am unable to debug as it is a multithreaded one and crashes with error SIGSEGV. I get lot of information from LogCat, which gives me addresses in my native library. It would be helpful if I could convert these addresses into my code.
Does anybody have any idea how to use addr2line, which is provided with android-ndk?
Let's say that logcat show you the following crash log (this is from one of my projects):
I/DEBUG ( 31): *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** I/DEBUG ( 31): Build fingerprint: 'generic/sdk/generic:2.3/GRH55/79397:eng/test-keys' I/DEBUG ( 31): pid: 378, tid: 386 >>> com.example.gltest Look at the last 3 lines; this is your callstack. 'pc' is the program counter, and the pc for stack frame #00 gives you the address where the crash occurred. This is the number to pass to addr2line.
I'm using NDK r5, so the executable I'm using is located at $NDK/toolchains/arm-linux-androideabi-4.4.3/prebuilt/linux-x86/bin; make sure that is in your $PATH. The command to use looks like
arm-linux-androideabi-addr2line -C -f -e obj/local/armeabi/libXXX.so Or, for the case above:
arm-linux-androideabi-addr2line -C -f -e obj/local/armeabi/libnativemaprender.so 0003deb4 Which gives you the location of the crash.
Note:
Also, when using NDK r5 with a 2.3 AVD, it is actually possible to debug multithreaded code.
There's an easier way to do this now (ndk-r7). Check out the ndk-stack command. The docs are in you_android_ndk_path/docs/NDK-STACK.html