How to get symbolicated libart.so/libc.so stacktraces in Android NDK?

Question

Note: Symbols are showing up in crashlytics for our c++ library, the problem is that they aren't showing for system libraries like libc, libart, libbase, and libandroid_runtime.

We have some tricky crashes that happen entirely in the Android runtime and these are hard to debug without symbols. In firebase crashlytics we see the following stack trace:

Crashed: Thread :  SIGABRT  0x0000000000000000
#00 pc 0x4e574 libc.so 
#01 pc 0x4e540 libc.so 
#02 pc 0x5677d8 libart.so 
#03 pc 0x13ab0 libbase.so 
#04 pc 0x13090 libbase.so 
#05 pc 0x38cb6c libart.so 
#06 pc 0x39f7d8 libart.so 
#07 pc 0x1260e0 libandroid_runtime.so 
#08 pc 0x124ef4 libandroid_runtime.so 
#09 pc 0x124dc4 libandroid_runtime.so 
#10 pc 0x115468 libandroid_runtime.so

When I force a test crash in our C++ library by dereferencing a null pointer, I see the following backtrace in my local Android Studio console:

...snip...
      #06 pc 00000000002d7644  /apex/com.android.art/lib64/libart.so (art_quick_generic_jni_trampoline+148) (BuildId: adb75d6f792faa24b1bc8cf512fb112c)
      #07 pc 00000000002cdd64  /apex/com.android.art/lib64/libart.so (art_quick_invoke_stub+548) (BuildId: adb75d6f792faa24b1bc8cf512fb112c)
      #08 pc 00000000002f23d0  /apex/com.android.art/lib64/libart.so (art::interpreter::ArtInterpreterToCompiledCodeBridge(art::Thread*, art::ArtMethod*, art::ShadowFrame*, unsigned short, art::JValue*)+312) (BuildId: adb75d6f792faa24b1bc8cf512fb112c)
      #09 pc 00000000003839f4  /apex/com.android.art/lib64/libart.so (bool art::interpreter::DoCall(art::ArtMethod*, art::Thread*, art::ShadowFrame&, art::Instruction const*, unsigned short, art::JValue*)+800) (BuildId: adb75d6f792faa24b1bc8cf512fb112c)
      #10 pc 00000000003813f4  /apex/com.android.art/lib64/libart.so (MterpInvokeVirtualRange+1368) (BuildId: adb75d6f792faa24b1bc8cf512fb112c)
      #11 pc 00000000002c8714  /apex/com.android.art/lib64/libart.so (mterp_op_invoke_virtual_range+20) (BuildId: adb75d6f792faa24b1bc8cf512fb112c)
...snip...

However, the same crash in crashlytics looks like this:

...snip...
#07 pc 0x222244 libart.so 
#08 pc 0x218964 libart.so 
#09 pc 0x284208 libart.so 
#10 pc 0x3e34ac libart.so 
#11 pc 0x800ba4 libart.so 
...snip...

How can we get crashlytics to include the information that is clearly in the crashdump?

Some notes on our build setup:

We have already followed https://firebase.google.com/docs/crashlytics/ndk-reports
Gradle Project 1 builds the native library, ensuring that debug is on and symbols are not stripped.
Gradle Project 2 builds the app and links in the library and tells crashlytics to upload native symbols

            firebaseCrashlytics {
                nativeSymbolUploadEnabled true
                unstrippedNativeLibsDir file("PATH/TO/UNSTRIPPED/DIRECTORY")
            }

How to get symbolicated libart.so/libc.so stacktraces in Android NDK?

0 Answers