Bug 9150 - [PATCH] do not crash at unresolved custom attribute
Summary: [PATCH] do not crash at unresolved custom attribute
Alias: None
Product: Runtime
Classification: Mono
Component: Debugger ()
Version: unspecified
Hardware: PC Linux
: Normal normal
Target Milestone: Future Cycle (TBD)
Assignee: Zoltan Varga
Depends on:
Reported: 2012-12-28 01:15 UTC by Atsushi Eno
Modified: 2017-09-26 19:12 UTC (History)
5 users (show)

Is this bug a regression?: ---
Last known good build:

fix (1.38 KB, patch)
2012-12-28 01:15 UTC, Atsushi Eno

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Description Atsushi Eno 2012-12-28 01:15:04 UTC
Created attachment 3138 [details]

I encountered this NIE while debugging my code (which is https://github.com/atsushieno/md-typescript/commit/2e4aa00ea, I added explicit commit rev. IF you ever want to reproduce):

System.NotImplementedException: The requested feature is not implemented.
  at Mono.Debugger.Soft.CustomAttributeDataMirror.Create (Mono.Debugger.Soft.VirtualMachine vm, Mono.Debugger.Soft.CattrInfo[] info) [0x0019e] in /svn/monodevelop/main/contrib/Mono.Debugger.Soft/Mono.Debugger.Soft/CustomAttributeDataMirror.cs:140 
  at Mono.Debugger.Soft.MethodMirror.GetCAttrs (Mono.Debugger.Soft.TypeMirror type, Boolean inherit) [0x00059] in /svn/monodevelop/main/contrib/Mono.Debugger.Soft/Mono.Debugger.Soft/MethodMirror.cs:100 
  at Mono.Debugger.Soft.MethodMirror.GetCustomAttributes (Mono.Debugger.Soft.TypeMirror attributeType, Boolean inherit) [0x00012] in /svn/monodevelop/main/contrib/Mono.Debugger.Soft/Mono.Debugger.Soft/MethodMirror.cs:90 
  at Mono.Debugging.Soft.SoftDebuggerBacktrace.CreateStackFrame (Mono.Debugger.Soft.StackFrame frame, Int32 frameIndex) [0x00278] in /svn/monodevelop/main/src/addins/MonoDevelop.Debugger.Soft/Mono.Debugging.Soft/SoftDebuggerBacktrace.cs:176 
  at Mono.Debugging.Soft.SoftDebuggerBacktrace.GetStackFrames (Int32 firstIndex, Int32 lastIndex) [0x00027] in /svn/monodevelop/main/src/addins/MonoDevelop.Debugger.Soft/Mono.Debugging.Soft/SoftDebuggerBacktrace.cs:85 
  at Mono.Debugging.Client.Backtrace.GetFrame (Int32 n) [0x00029] in /svn/monodevelop/main/src/core/Mono.Debugging/Mono.Debugging.Client/Backtrace.cs:50 
  at Mono.Debugging.Client.Backtrace..ctor (IBacktrace serverBacktrace) [0x00026] in /svn/monodevelop/main/src/core/Mono.Debugging/Mono.Debugging.Client/Backtrace.cs:26 
  at Mono.Debugging.Soft.SoftDebuggerSession.GetThreadBacktrace (Mono.Debugger.Soft.ThreadMirror thread) [0x00001] in /svn/monodevelop/main/src/addins/MonoDevelop.Debugger.Soft/Mono.Debugging.Soft/SoftDebuggerSession.cs:707 
  at Mono.Debugging.Soft.SoftDebuggerSession.HandleBreakEventSet (Mono.Debugger.Soft.Event[] es, Boolean dequeuing) [0x002fa] in /svn/monodevelop/main/src/addins/MonoDevelop.Debugger.Soft/Mono.Debugging.Soft/SoftDebuggerSession.cs:1277 
  at Mono.Debugging.Soft.SoftDebuggerSession.HandleEventSet (Mono.Debugger.Soft.EventSet es) [0x00076] in /svn/monodevelop/main/src/addins/MonoDevelop.Debugger.Soft/Mono.Debugging.Soft/SoftDebuggerSession.cs:1163 
  at Mono.Debugging.Soft.SoftDebuggerSession.EventHandler () [0x00032] in /svn/monodevelop/main/src/addins/MonoDevelop.Debugger.Soft/Mono.Debugging.Soft/SoftDebuggerSession.cs:1097 

I have no idea why it falls to this condition, but this error tells me that there are some *existing* code that prevents debugging for unnecessary reason. It should ignore those attributes rather than just to crash.

The attached patch fixes (or workarounds) it. The patch was created in monodevelop contrib tree but it is actually for Mono.Debugger.Soft.dll.
Comment 1 Rodrigo Kumpera 2017-07-14 23:42:47 UTC
I made a PR out Atsushi's patch: https://github.com/mono/mono/pull/5214

Zoltan, could you review the PR and close this bug if it's good?
Comment 2 Rodrigo Kumpera 2017-07-18 18:04:35 UTC
Zoltan's comment on the PR:

This just silently hides some attributes without any indication that an error occurred, so I don't think its a good idea.

The bug still exists and we should still address it somehow.