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.NET Debugging for the Production Environment

Learn how to debug managed exceptions in a production environment, including collecting relevant data, using common debugger commands, and understanding first and second chance exceptions.

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.NET Debugging for the Production Environment

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  1. .NET Debugging for the Production Environment Part 6: Debugging a Managed Exception Brad Linscott Premier Field Engineering

  2. Agenda • Managed exceptions • Data to collect in production environment • Common debugger commands for managed exceptions • Demo

  3. Managed Exceptions • 1st chance (non-fatal) and 2nd chance (fatal/crash) • Like everything else in .NET, an exception is an object. • Too many too quickly will degrade performance.

  4. Data to Collect for Exceptions • Perfmon (.NET CLR Exceptions/#ExceptionsThrown/sec) exposes frequency of exceptions • Dump file when exception is thrown • DebugDiag/ADPlus can be configured to automate the procedure

  5. Common Debugger Commands for High CPU Hangs • !PrintException (addr), if alive on the current thread • !DumpObject (addr); Look for InnerException • To find the offending function(s), use stack & thread commands • Any variant of ‘k’ (kb, kn, kp, k, etc.) for native stacks • !psscorX.clrstack for managed stack (X=2, 4) • Other thread/stack commands • Sometimes we need help finding the executing line of code in the offending function • u;!u

  6. Demo: Debugging a Managed Exception

  7. Feedback? • Send us your feedback! • What other topics do you want covered?

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