How to deobfuscate an Android stacktrace using mapping file

Question

I got a stacktrace from the crashreporting system and it is obfuscated, like

... Failed resolution of: Lru/test/c/b/a; ...

I have a mapping file.

How to deobfuscate this stacktrace using mapping.txt?

Answer 1

Get deobfuscated crash stacktrace from your app page

Upload your mapping.txt to your app PlayStore page with the following steps:

1. Sign in to your Play Console.
2. Select an app.
3. On the left menu, click Android vitals > Deobfuscation files.
4. Next to a version of your app, click Upload.
5. Upload the ProGuard mapping file for the version of your app.

After doing so, to view your deobfuscated crash stack traces:

1. Sign in to your Play Console.
2. Select an app.
3. On the left menu, click Android vitals > ANRs & Crashes.
4. Select a crash.
5. On the "Stack Traces" tab, you'll see your deobfuscated stack traces.

You can check this link for more details.

Deobfuscate a piece of stacktrace

To convert the code by yourself use the retrace script (retrace.bat on Windows; retrace.sh on Mac/Linux). It is located in the ~/Android/sdk/tools/proguard/bin/ directory. The script takes the mapping.txt file and your stack trace, producing a new, readable stack trace. The syntax for using the retrace tool is:

retrace.bat|retrace.sh [-verbose] mapping.txt [<stacktrace_file>]