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Postsdbo
PO
 

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    <p>Let's say that logcat show you the following crash log (this is from one of my projects):</p> <pre><code>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 &gt;&gt;&gt; com.example.gltest &lt;&lt;&lt; I/DEBUG ( 31): signal 11 (SIGSEGV), code 1 (SEGV_MAPERR), fault addr 00000000 I/DEBUG ( 31): r0 001dbdc0 r1 00000001 r2 00000000 r3 00000000 I/DEBUG ( 31): r4 00000000 r5 40a40000 r6 4051a480 r7 42ddbee8 I/DEBUG ( 31): r8 43661b24 r9 42ddbed0 10 42ddbebc fp 41e462d8 I/DEBUG ( 31): ip 00000001 sp 436619d0 lr 83a12f5d pc 8383deb4 cpsr 20000010 I/DEBUG ( 31): #00 pc 0003deb4 /data/data/com.example.gltest/lib/libnativemaprender.so I/DEBUG ( 31): #01 pc 00039b76 /data/data/com.example.gltest/lib/libnativemaprender.so I/DEBUG ( 31): #02 pc 00017d34 /system/lib/libdvm.so </code></pre> <p>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.</p> <p>I'm using NDK r5, so the executable I'm using is located at <code>$NDK/toolchains/arm-linux-androideabi-4.4.3/prebuilt/linux-x86/bin</code>; make sure that is in your <code>$PATH</code>. The command to use looks like</p> <pre><code>arm-linux-androideabi-addr2line -C -f -e obj/local/armeabi/libXXX.so &lt;address&gt; </code></pre> <p>Or, for the case above:</p> <pre><code>arm-linux-androideabi-addr2line -C -f -e obj/local/armeabi/libnativemaprender.so 0003deb4 </code></pre> <p>Which gives you the location of the crash.</p> <p>Note:</p> <ul> <li>The -C flag is to demangle C++ code</li> <li>Use the .so file under obj/local/armeabi, since this is the non-stripped version</li> </ul> <p>Also, when using NDK r5 with a 2.3 AVD, it is actually possible to debug multithreaded code.</p>
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    1. POHow to use addr2line in Android
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    1. COGreat, Excellent. Thanks for the detailed answer. It worked for me 100%. Thank you and an up vote for you.
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      1. USAnil Arrabole
    2. COBrilliant, got this working thanks to you - I was struggling using the `.so` file in `libs`, which of course is stripped. The one in `obj` works.
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    3. COavdree - I'd encourage you to show the actual output of add2line in this otherwise very good answer.
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      1. USChris Markle
 

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