This post shows WinDBG commands to analyse SQL queries produced by application. -> $ra = The return address currently on the stack, p a = sort by Addr, n = sort by name, z = sort by size. For troubleshooting .NET (Core) memory or performance issues, thereâre a lot of free or commercial tools available. .symopt- Flags, displays current symbol options : r eax=5, edx=6) dS [/c #] [Addr], Dump string struct (struct! ------- Flush buffer to log files, Display module inclusion/exclusion list fill specified memory location with the pattern "ABC", repeated several times, search memory locations 0012FF40 through 0012FF5F for the pattern "Hello", list all heaps with range information (startAddr, endAddr), Summary for all heaps (reserved and committed memory, ..), Dump HeapHandle list. For an explanation of the possible, Creates a debugging server that can be accessed by other debuggers. Brief help $peb == pseudo-register, Freeze the thread causing the current exception, will repeat every the extension command !gle for every single thread being debugged, 1 (user time) + 2 (kernel time) + 4 (time elapsed since thread start), Dump formatted view of our threads TEB (only some information), SymbolPattern is equivalent to using x SymbolPattern, break on methods (useful if the same method is overloaded and thus present on several addresses), bu MYDLL!DllMain "j (dwo(@esp+8) == 1) '.echo MYDLL!DllMain -> DLL_PROCESS_ATTACH; kn' ; 'g' ", bu kernel32!LoadLibraryExW ".echo LoadLibraryExW for ->; du dwo(@esp+4); g", bu kernel32!LoadLibraryExW ";as /mu ${/v:MyAlias} poi(@esp+4); .if ( $spat( \"${MyAlias}\", \"*MYDLL*\" ) != 0 ) { kn; } .else { g }", bu sioctl!DriverEntry "r eip = poi(@esp); r esp = @esp + 0xC; .echo sioctl!DriverEntry skipped; g", bu MyApp!WinMain "r eip = poi(@esp); r esp = @esp + 0x14; .echo WinSpy!WinMain entered; g", executes the current program to source line 123; print the value of counter; resume execution, trace sub-functions to depth 4, display their return values, get all stacks of our process (one for each thread), display all stacks that contain "kernel32", list all variables that contain the word _PEB, list with verbose output (address and size included), dump Ldr field + all fields that start with OS*, dump local variables with type information (/t), addresses and EBP offsets (/V), classify them into categories (/i), Dump name of file containing address 00400000. show info for committed sub-region for our thread's stack. In verbose mode some commands (such as register dumping) have more detailed output. -> which processor's unwinder is used for stack tracing Use target computer's native processor mode MethodTable: 00007fff38dd6668 Enables verbose output from symbol handler. to list the supported command line options. -cnt Now, fire up WinDbg (the screenshot below shows the Preview-Version), choose File->Open dump file and select the the dump file youâve just created. Display memory [#columns to display] SOSEX for .NET. MethodTable: 00007fff38f84a30 !error ErrValue 1, Decode and display information about an error value ]Name [Field] Addr -ma : Write a dump file with all process memory. r Reg:[Num]Type .step_filter /c. Quad-word values (8 bytes). .expr /s masm, Choose default expression evaluator Terminated by: end of line OR semicolon commands in DML format (top bar of links is given) by memory order ~# [Command] dds = dwords (4b) This command analyzes exception information in the crash dump, determines the place where the exception occurred, the call stack, and displays detailed report. SymPattern can contain wildcards Called functions are traced as well. d*u Learn more about installation and configuration in WinDbg Preview - Installation. 0x1 = basic integer registers .symfix+ DownstreamStore. Value to assign to the register. Evaluate c++ expression, .expr not null-delimited char sequence) !logc p # Dump default register mask. Use the following command to load the "MEX Debugging Extension for WinDbg" into the debugger: .load (extracted folder)\mex.dll. source and line number Statistics: !heap -p -all. Loading stuff .loadby sos mscorwks Load SOS extension (will identify sos location by loaded mscorwks path) .load c:\Windows\Microsoft.NET\Framework\v2.0.50727\sos Load SOS extension for .NET 2.0 .load psscor2 Load PSSCOR… Name: MemoryLeaker.MyData[] Configures the required firewall rules on the local system to allow kernel debugging using KDNET. You can use -? dv This extension is only available in kernel mode. Dump usage statistic for every AllocSize [HeapHandle = given heap | 0 = all heaps]. a) From WinDbg's command line do a !heap -p -h [HeapHandle], where [HeapHandle] is the value returned by HeapCreate. f = force immediate symbol load (overrides lazy loading); v = verbose mode id = Signed dword (4b) wt -nc .. Dump only specified registers from current mask Flags Addr of struct to be dumped !logc [e|d] * switch to thread N (new current thread) MEX !sqlcmd finds all SQL commands & their state & executing thread: Use case: Figuring out the nature of load produced on SQL Server. Other calls to SetLastError are redirected to a function located in NTDLL.DLL, RtlSetLastWin32Error. Set symbol store path to automatically point to http://msdl.microsoft.com/download/symbols Begins logging information to a log file. Lists all loaded debugger extensions as DML (where extensions are linked to a .extmatch), .extmatch /e ExtDLL FunctionFilter uw = Unsigned word (2b) Change ), You are commenting using your Google account. .extmatch /D /e ExtDLL FunctionFilter, Show all exported functions of an extension DLL. If you are in a local debugger session, srcpath and lsrcpath are effectively the same (your âserverâ is your local session). ~Thrd == thread that the bp applies too. File: d:\dev\MemoryLeaker\MemoryLeaker\bin\Debug\netcoreapp2.2\MemoryLeaker.dll EEClass: 00007fff8bb56c08 Any additional feedback? WinDbg cheat sheet for crash dump analysis. For the given exception, disable first- and second-chance-handling, and only display a message on the console. Extended page heap help HeapAlloc, HeapFree, new, and delete log dt [-n|y] [mod! So you can analyze the dump on a developer machine later, without breaking your productive application. ( Log Out / -o = Omit the offset value (fields of struct) brief help. -trace INDEX kp ... This mask controls how registers are displayed by the "r". Each time a function call is made, another frame is created so that the called function can access arguments, create local variables, all threads But thereâs also a Preview version available from the Microsoft Store which comes with other nice features and dark theme support. -brk [INDEX]. by load order (default) That is useful to understand if snapshot collected during peak pressure. WinDbg : !process The !process extension command lists down some very useful information related to processes. d*p. Display referenced memory = display pointer at specified Addr, dereference it, and then display the memory at the resulting location in a variety of formats. After a reboot, the debugger will break into the target computer as soon as a kernel module is loaded. b = byte + ascii I have tried setting a conditional breakpoint on LoadLibraryExW like the examples in this document. oR = dump return register values (EAX value) in the appropriate type [b = first 3 params, v = FPO + calling convention, p = all params: param type + name + value], [n = with frame #] For a full listing of commands type: !mex.help. uq = Unsigned qword (8b) Set symbol breakpoint. most recent exception data (don’t forget the external stack), !dumpheap [-stat] [-mt <>] [-type <>] [-strings] [-min] [-max], Show the object that are in the given memory segments (show only specific generation by combining with output of !eeheap -gc), !dumpgen
[-free] [-stat] [-type <>] [-nostrings], Dumps the contents of the specified generation (sosex), Displays the GC generation of the specified object (sosex), Find how an object reference is reachable, Displays all references from and to the specified object (sosex), all the object that are in finalize queue, Displays objects in the finalization queue (sosex), Display objects in the Freachable queue (sosex). SlotIdx = dump only specified slot WinDbg is basically a debugger for native applications. FUNCTION = placeholder for exported function ...excerpt x /n .. ...excerpt -v Very detailed exception data (SLOW), -hang Generates !analyze hung-application output. .holdmem -D MEX Debugging Extension for WinDbg can help you simplify common debugger tasks, and provides powerful text filtering capabilities to the debugger. Dump only specified floating-point registers ~Thread r [Reg:[Num]Type], Dump all registers b = dump in reverse order (follow BLinks instead of FLinks) !sqlcn groups commands per connection string: Use case: Shows most-queried (connection strings)/databases application-wide. all params formatted (new line)
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