BASIC DEBUGGING TASKS in .NET

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Let s take a look at an example of how to generate and debug a snapshot In this particular example, we will use the debuggers themselves to create the snapshot Plenty of other powerful tools exist that can also be used to take snapshots, and we will discuss those tools in more detail in 8 Let s start by launching 03ObjTypesexe under the debugger and resume execution until the debugger breaks with a CLR exception At this point, we can use the dump command to generate a dump file as shown in the following:
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Press any key to continue (Exception) (2088177c): CLR exception - code e0434f4d (first chance) (2088177c): CLR exception - code e0434f4d (!!! second chance !!!) eax=0030f070 ebx=e0434f4d ecx=00000001 edx=00000000 esi=0030f0f8 edi=00135408 eip=777442eb esp=0030f070 ebp=0030f0c0 iopl=0 nv up ei pl nz ac po nc cs=001b ss=0023 ds=0023 es=0023 fs=003b gs=0000 efl=00000212 *** ERROR: Symbol file could not be found Defaulted to export symbols for C:\Windows\system32\KERNEL32dll KERNEL32!RaiseException+0x58: 777442eb c9 leave 0:000> dump /ma c:\dumpdmp Creating c:\dumpdmp - mini user dump Dump successfully written 0:000>
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The dump command takes a filename as a parameter and indicates the filename where the dump will be stored The dump command can also, optionally, take a number of different switches that control how much of the process state should be stored in the dump file It should come as no surprise that the more process state is stored the greater the success when debugging We will take a look at the options in 8 Now that we have a dump file, we can debug it using the same debugger To debug the dump file, we need to tell the debugger that we are interested in debugging a snapshot We can use the z debugger switch followed by the path to the dump file, as shown in the following:
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ntsd -z c:\dumpdmp
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This causes the debugger to read the dump file and then present the all-familiar debug prompt, as shown in the following:
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Microsoft (R) Windows Debugger Version 690003113 X86 Copyright (c) Microsoft Corporation All rights reserved
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Loading Dump File [c:\dumpdmp] User Mini Dump File: Only registers, stack and portions of memory are available
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Symbol search path is: *** Invalid *** Executable search path is: Windows Server 2008 Version 6001 (Service Pack 1) MP (2 procs) Free x86 compatible Product: WinNt, suite: SingleUserTS Debug session time: Mon Dec 8 16:49:17000 2008 (GMT-8) System Uptime: not available Process Uptime: 0 days 0:00:58000 This dump file has an exception of interest stored in it The stored exception information can be accessed via ecxr (2088177c): CLR exception - code e0434f4d (first/second chance not available) eax=0030f070 ebx=e0434f4d ecx=00000001 edx=00000000 esi=0030f0f8 edi=00135408 eip=777442eb esp=0030f070 ebp=0030f0c0 iopl=0 nv up ei pl nz ac po nc cs=001b ss=0023 ds=0023 es=0023 fs=003b gs=0000 efl=00000212 *** ERROR: Symbol file could not be found Defaulted to export symbols for kernel32dll kernel32!RaiseException+0x58: 777442eb c9 leave 0:000>
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The first part of the debugger output from the previous listing states that the debugger loaded a dump file and that the type of the dump file is a mini dump file Mini dump is just one of the many forms of dump files that can be generated, and it contains limited process state information The next important piece of information the debugger tells us is that the dump file has an exception contained within it and that the exception information can be retrieved using the ecxr command If you issue the ecxr command, you will see the information relevant to the exception, such as the register content at the point of the exception, which in turn enables you to get thread stack information We will take a look at postmortem debugging in more detail in 8, where we will take a look at some powerful tools that can make it easier to generate dump files to debug problems offline
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