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Loading external DLL into WinDBG


Loading external DLL into WinDBG

By : Jagadish
Date : November 22 2020, 10:38 AM
I think the issue was by ths following , This doesn't look like a stack overflow. A stack overflow usually needs more than 5 calls on the stack (as long as the stack was not filled by something else before). From the method name, it looks like an IOException. To get the type of the exception, type
code :
~#s; *** Switch to the thread with the exception
.exr -1; *** Native exception info
.loadby sos clr; *** Load .NET extension
!pe; *** Use .NET extension to get .NET exception info
!clrstack; *** Might differ from the stack in the exception
.sympath+ c:\mydirectory
.reload


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What do WinDbg mean by External fragmentation?

What do WinDbg mean by External fragmentation?


By : Ana Šaranović
Date : March 29 2020, 07:55 AM
may help you . Basically you have a large number of very small object allocations, which cause the fragmentation. In addition you are mixing native and managed code in the same process and you are making big memory allocations. These approaches require memory management. It would be best to create a dedicated heap for large memory allocations on process startup to avoid this kind of problem. The heap should only be used for large memory allocations of native code.
In addition it would be a good idea to analyze why the managed code needs so much memory.
Why WinDBG is not loading modules?

Why WinDBG is not loading modules?


By : shivm
Date : March 29 2020, 07:55 AM
Hope this helps I don't think its problem for loading the driver. Probably, the debugger did not able to find the symbols correctly.
This symbol path doesn't look good.
code :
C:\SYMBOLS.NET\_studiocache\MicrosoftPublicSymbols*http://msdl.microsoft.com/download/symbols;
C:\SYMBOLS.NET\_studiocache\MicrosoftPublicSymbols
srv*C:\SYMBOLS.NET\_studiocache\MicrosoftPublicSymbols*http://msdl.microsoft.com/download/symbols;
WinDbg: Execute an external application every time a breakpoint is hit

WinDbg: Execute an external application every time a breakpoint is hit


By : venkat chitturi
Date : March 29 2020, 07:55 AM
it helps some times Is there a way to run some external application every time a breakpoint is hit in WinDbg? , The syntax for setting a breakpoint is
code :
[~Thread] bp[ID] [Options] [Address [Passes]] ["CommandString"] 
Windbg issue loading pdb for user defined executable

Windbg issue loading pdb for user defined executable


By : 정원재
Date : March 29 2020, 07:55 AM
I wish did fix the issue. !sym noisy : tells you why you failed to load symbols .reload /f foo.exe - to force load .reload /f /i foo.exe - to force load with mismatched symbols. This may give you some valuable info.
ntdll module not loading correctly in windbg, but why?

ntdll module not loading correctly in windbg, but why?


By : doug
Date : March 29 2020, 07:55 AM
hope this fix your issue MS is getting rid of all type information in the latest Windows 7 PDBs. This breaks !heap. Here's a twitter conversation about it started by Alex Ionescu, a co-author of "Windows Internals, Sixth Edition": https://twitter.com/aionescu/status/634028737458114560
UPDATE: 10/12/2015: Possible workaround using the PDB Type Theft python script which copies type information from one PDB to another. The usage would be to copy the type information from an older PDB that has the type information that was removed in later PDBs. This link has all the details: http://h30499.www3.hp.com/t5/HP-Security-Research-Blog/PDB-Type-Theft/ba-p/6801065#.Vhv2gPm6fmE
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