Mono无PDB堆栈跟踪中GUID含义解析及堆栈重构技术问询

Let’s break down that confusing GUID-looking string in your Mono stack trace and walk through how to use it (alongside your PDB/MDB files) to get full, meaningful stack traces.

First, that <9fdab2ac823a429cb7b8525426626ccc> is Mono’s Module Unique Identifier (Module ID). It’s a hash (usually SHA1 or MD5, rendered in hex) generated for each loaded assembly module in memory. Mono uses this to uniquely identify assembly instances—critical when the same assembly is loaded multiple times, or when different versions of an assembly are present in the process. Unlike metadata tokens (which are internal to an assembly), this ID is globally unique to the loaded module instance.

How to Use This ID to Reconstruct Full Stack Traces #

Here’s a step-by-step approach to map this ID and IL offset back to actual code locations using your PDB/MDB files:

• Link the Module ID to an Assembly File
  You can use Mono’s built-in tools to connect the Module ID to the physical assembly on disk. For example:

  • Run your game with mono --debug (e.g., mono --debug YourGame.app/Contents/MacOS/YourGame)—this will log additional debug context, including which assembly corresponds to each Module ID.
  • Use the monodis utility with monodis --assembly YourGame.exe to inspect the assembly’s hash information, which should match the Module ID in your stack trace.

• Match to Debug Information Files (MDB/PDB)
  Mono’s MDB files (or converted PDBs) are tied to the assembly’s Module ID. Once you’ve linked the ID to an assembly, locate the corresponding .mdb or .pdb file (usually in the same directory as the assembly). Then use the mono-symbolicate tool (included with Mono) to resolve the IL offset to line numbers and method details:

  mono-symbolicate YourGame.mdb < stacktrace.txt
  

  This tool will parse your stack trace, match the Module ID and IL offset to the debug symbols, and output a full stack trace with filenames and line numbers.

• Get Mono to Output Full Stack Traces Natively
  If you’d prefer Mono to generate full stack traces directly (instead of parsing the bare ones), make sure your assembly was compiled with full debug information (use /debug:full during compilation). Then run your game with debugging enabled:

  • Set the environment variable MONO_DEBUG=full before launching the game, or use the --debug flag with the mono runtime.
    This will make Mono automatically load the matching MDB/PDB files and output stack traces that include filenames, line numbers, and full method signatures—no manual parsing required.

Combining with Your Custom Stack Trace Implementation #

Since you already have a custom method that outputs metadata tokens, you can pair those tokens with the Module ID to get even more precise symbol resolution. Metadata tokens point to a method within an assembly, while the Module ID identifies the exact loaded assembly instance. Together, they let you reliably look up the correct debug symbols, even if multiple versions of the same assembly are loaded.

内容的提问来源于stack exchange，提问作者Lennard Fonteijn