For example, W the en call was initiated to the system service, operating system switches to kernel stack to execute the function. When the function is finished, OS switches back to user stack. This allows drivers to execute some work the at the lower request level. So that the processor will free up for high priority work. Each processor will have its own DPC stack.
For every function, there will be name before and after the exclamation mark. The name before exclamation mark is the name of a driver or OS component that provides the function. The name after the exclamation mark is the name of the function itself. For example, if we take the NTFS!
In summary, ntfs. Make sure the symbol path is pointing to Microsoft symbol server. Click on the Open crash dump from the file menu and select the dump file. Select View menu and click on call stack option. It will open a new window as shown below. We can customize the display by adding the arguments like Raw args which display the hexadecimal numbers on left side of function names. There are other parameters like Func info, Source, Addrs, Headings, Nonvolatile regs, Frame nums, source args to customize the stack trace information.
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Unlimited Support Plan. Chat Support for Admin. Separate Account Manager. Filtered Dump : — This a kind of dump in which we get more in depth information.
It contains all the details of structures,functions including the details of all the stolen buffers. The size of these dumps is moderate and in 64 bit systems the size of these dumps depend on max server memory It can reach in multiple GBs. To get the SQL server filtered dump we need to enable the trace flag using command dbcc traceon , It contains both the hashed and stolen pages pages except index or data pages.
The size of the dump file is equal to the total memory consumed by SQL server. On 64 bit systems, it reaches in multiple GBs in size. To get the full dumps we need to enable the trace flag using command dbcc traceon , Each SQL Dump file has three kinds of files. Where nnnn is a number. For example, if your application is 64 bit, run the 64 bit version of WinDbg. After maximizing the dump window inside the program, it should look something like this:.
The next step here is to load application symbols. This is important because loading symbols in a debugging session helps restore context to the application binary that had information stripped out from it at build time. This includes things like line numbers, variables, function names, etc. Lets enter the next few commands in the command box at the bottom of WinDbg to setup our symbol cache and loading preferences. Also set the local caching folder to store downloaded symbols.
Adjust the cache folder and application private folder to the exact folders on your computer. If this worked correctly, we should see that the debugger correctly loaded our private symbols for our application:.
SOS is a debugging tool extension that makes debugging managed code. NET applications easier by providing details about the. It is installed when you install the. NET Framework component. The catch here is that you need the correct SOS version that matches the framework version used in your application, and loading this for older framework versions follows a slightly different process.
NET 4 and later like our sample app , just run the following:. However, if you want to verify that it actually loaded, run the following command to print the loaded extensions:.
Finally we are at the point where we can do something interesting with our crash dump. The best way to start is to run the! This will examine the dump and provide loads of immediately useful output. In this simple crash situation, we got the data for our error message and a stack trace with line numbers. Lets crash! Lets review a few other commands to poke around further. First up is! In our case, there were just two threads. You can see which of the two threads has the crash in it.
Notice on the left side of the threads list, there is a thread ID. This parameter prints the parameters and locals!
Notice that the actual parameter name crashingText was provided, and you can see a memory address next to it. That address in blue is the memory address of the value supplied to that parameter. You can click on that link directly, which runs the! The file name is automatically generated by the API and is based on the current date and time. The optional dump type parameter specifies what the taken mini dump should contain.
It also specifies whether the dump will be saved in a dmp or cab file, and, in the case of cab files, whether the symbols will be saved along with the dump.
If the optional parameter is omitted, default settings are used. Note, that saving a dump into a cab file takes longer than saving ordinary dump; attaching symbol files takes even longer. This API takes an optional DWORD parameter which is a type flag or flag combination and a string reference in which it returns you a string containing the call stack trace for the current context.
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