Loading skill
Install any skill in seconds. Free to start, no credit card required.
Get Started Free →dotnet/android-tombstone-symbolication
Symbolicate the .NET runtime frames in an Android tombstone file. Extracts BuildIds and PC offsets from the native backtrace, downloads debug symbols from the Microsoft symbol server, and runs llvm-symbolizer to produce function names with source file and line numbers. USE FOR triaging a .NET MAUI or Mono Android app crash from a tombstone, resolving native backtrace frames in libmonosgen-2.0.so or libcoreclr.so to .NET runtime source code, or investigating SIGABRT, SIGSEGV, or other native sign
Passed 21 of 22 test cases with the skill, and 14 of 22 without it.
and 4 more in the full report
7 fixed14 passed either way1 still failing0 broke
Tokens, turns and time describe resource use, not a dollar price.
One of 7 test cases the skill fixed. Same model, same prompt, with and without the skill.
I am invoking `llvm-symbolizer` directly against `libmonosgen-2.0.so.debug` for PC offset `0x222098`. I want C++ function names demangled in the output. Which flag toggles demangling?
| Checked | Without skill | With skill |
|---|---|---|
| Includes the -C option when invoking llvm-symbolizer. | Missed | Passed |
The instructions your model reads when the skill loads.
Resolves native backtrace frames from .NET Android app crashes (MAUI, Xamarin, Mono) to function names, source files, and line numbers using ELF BuildIds and Microsoft's symbol server.
Inputs: Tombstone file or logcat crash output, llvm-symbolizer (from Android NDK or any LLVM 14+ toolchain), internet access for symbol downloads.
Do not use when: The crash is a managed .NET exception (visible in logcat with a managed stack trace), the crashing library is not a .NET component (e.g., libart.so), or the tombstone is from iOS.
Each backtrace frame has this format:
#NN pc OFFSET /path/to/library.so (optional_symbol+0xNN) (BuildId: HEXSTRING)
Extract: frame number, PC offset (hex, already library-relative), library name, and BuildId (32–40 hex chars).
Symbolicate all threads by default (background threads like GC/finalizer often have useful .NET frames). The crashing thread's backtrace is listed first; additional threads appear after --- --- --- markers.
Format notes:
#NN pc frame lines with or without a backtrace: header, and strips logcat timestamp/tag prefixes automatically.adb shell readelf -n, CI build artifacts, or the .NET runtime NuGet package.#1 pc into issue links — replace org/repo#N pc with #N pc before saving to a file.#NN pc OFFSET library.so (BuildId: HEX) tuples.Filter frames to .NET runtime libraries:
| Library | Runtime |
|---|---|
libmonosgen-2.0.so | Mono (MAUI, Xamarin, interpreter) |
libcoreclr.so | CoreCLR (JIT mode) |
libSystem.*.so | .NET BCL native components (Native, Globalization.Native, IO.Compression.Native, Security.Cryptography.Native.OpenSsl, Net.Security.Native) |
test cases passed, vs 14 / 22 without
More skills from the same source and nearby in the registry, with their headline benchmark lift.