windbg retrieving informationwindbg retrieving information

There are several ways you can use WinDbg to open a dump file. Instead of running a command that will list the processes in the system, the debugger provides access to an array of objects that represent each process in the system. This is displayed in units of Hours:Minutes:Seconds.Milliseconds. We've updated WinDbg to have more modern visuals, faster windows, a full-fledged scripting experience, and Time Travel Debugging, all with the easily extensible debugger data model front and center. Let's run it: Take one extra minute and find out why we block content. For more information about the command-line syntax, see WinDbg Command-Line Options. The result contains . I have loaded the Windows Debugging Tools on my Windows 7 machine and when I open Windbg and click View >Processes and Threads it sits there forever saying "Retrieving information". Opening the DMP file will cause the WinDbg debugger to run and load the file. Get in Store app. Displays information about the garbage-collected heap []. See also How to set up symbols in WinDbg. Windbg is like an x-ray plus mri plus ct scan for programs running on windows operating system, including the operating system itself. then a short explanation is that the symbols are used to decode the information held in the memory dump file which allows you to see the function names in the call stack, to give an example of what you might see with and without symbols: . (LogOut/ If Process is 0 and ImageName is omitted, the debugger displays information about all active processes. Lists the current, minimum and maximum working set size for the process, in pages. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. When the migration is complete, you will access your Teams at stackoverflowteams.com, and they will no longer appear in the left sidebar on stackoverflow.com. The first command: x /2 *!*. CrashMe is a simple application that implements several common debug situations and scenarios. gflags.exe - configuration tool used to enable and disable . By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. In a Command Prompt window, you can open a dump file when you launch WinDbg. To display full details on one process, set Flags to 7. In general, this is the executable name that was invoked to start the process, including the file extension (usually .exe), and truncated after the fifteenth character. inforr asked on 8/5/2011 Windbg hangs on "retrieving information" I have loaded the Windows Debugging Tools on my Windows 7 machine and when I open Windbg and click View > Processes and Threads it sits there forever saying "Retrieving information" Any ideas how to make it progress? ImageDirectoryEntryToData function (dbghelp.h) - Win32 apps Obtains access to image-specific data. The second command is more complicated and gives following results: I'm interested in the size of the CMap and CStringArray objects, so I'm launching following commands: This is working fine, I get the information I need. It is pronounced Windbag, Win"d-b-g," or, more intuitively, WinDebug. Go to the target machine and boot Windows from one of the debugging entries. You should end up with two versions of the tool: the 32-bit debugger and the 64-bit debugger. The default is 0x3 if Process is omitted or if Process is either 0 or -1; otherwise, the default is 0xF. To switch to a specific thread based on the OS thread ID that sys.dm_os_threads reports, you can use the following WinDbg command: ~~ [tid]s The place. Even if you create an empty destructor method (named Finalize in the .NET world), the CLR will manage such . most recent exception data (dont 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). In the final entry in the preceding example, the PID is 0x44, or decimal 68. It is part of the Windows Developer Kit which is a free download from Microsoft and is used by the vast majority of debuggers, including here on Ten Forums. You'd have to debug it to know for sure since any synchronous API call made on the thread would prevent it from getting to the point of checking if you had hit Ctrl+C, but it seems the most likely thing would be inability to make the network connection. Immediately go back to the host system, touch the WinDbg command window with the cursor to make it active, and press CTRL+BREAK. warning? dt (Display Type) - Windows drivers The dt command displays information about a local variable, global variable or data type. You can retrieve the latest version from Microsoft's web site. No symbols have been loaded for this document." WinDBG (Win dows D e B u G ger) is a Microsoft software tool that is needed to load and analyse the .dmp files that are created when a system BSOD's.The latest version of WinDBG allows debugging of Windows 10, Windows 8.x, Windows 7, and Windows Vista. For more information about the command-line syntax, see WinDbg Command-Line Options. The eight-character hexadecimal number after the word PROCESS is the address of the EPROCESS block. For information about processes in kernel mode, see Changing Contexts. Bit 2 (0x4) I was following one of Mark Russinovich's post and missed the step that you had to hit F6 to open the process selection first: Learnt a lot from marks videoscan check his videos. In this example, the thread has a lock on one resource, a SynchronizationEvent with an address of 80144fc0. With an EE membership, you can ask unlimited troubleshooting, research, or opinion questions. It helps us to root cause complicated problems like we discussed in windows ( OS ) and programs running inside the . Advanced Windows Memory Dump Analysis with Data Structures. Flags can be any combination of the following bits. Is this meat that I was told was brisket in Barcelona the same as U.S. brisket? Substituting black beans for ground beef in a meat pie. This function can be called only from within the filter expression of an exception handler. Sets the process context equal to the specified process for the duration of this command. The executable being debugged can be found with |: However, that executable name may significantly differ from its module name: From the output of lm, we can see that there are addresses associated with the module. Covered by US Patent. Its goals is to automatic analyze failures, detecting and assigning to known problems of dumps. Automate Memory Dump analysis with Windbg commands in C#. Toggle share menu for: Setting up WinDbg and Using Symbols Share Share . Not exactly the question you had in mind? Why? When the proper file has been chosen, select Open. The hexadecimal number after the word ParentCid is the PID of the parent process. .sympath. (LogOut/ Free. Fill in your details below or click an icon to log in: You are commenting using your WordPress.com account. As part of the Debugging Tools for Windows, WinDbg is a very known debugging tool that can use for both live and postmortem debug, user and kernel mode with a graphical user interface.. Also this seems to be working fine: This means that I need to get the name of the application of the dumpfile (it seems to be gone during some formatting). This tools is quite useful when the dump file is partially corrupted. For more information about analyzing processes and threads, see Microsoft Windows Internals, by Mark Russinovich and David Solomon. PDB's are stored in a file . Error 0x80004005 when reading dump file with WinDbg, Windbg Dump Generated programmatically can't be Debugged, how to dump string using Windbg poi function, How to use Windbg commands for viewing CMap entries. Command. Change), You are commenting using your Facebook account. How does DNS work when it comes to addresses after slash? A well-known and convenient but inofficial source is Codemachine where you can also download . document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); Production Debugging: A story about Exception code: 0xe053534f - Fog Creek Blog, Production Debugging: A story about Exception code: 0xe053534f - SkyOffice Consulting | SkyOffice Consulting, Uncovering a Memory Leak using WinDbg | Steve's Programming Blog, Load SOS extension (will identify sos location by loaded mscorwks path), .load c:\Windows\Microsoft.NET\Framework\v2.0.50727\sos, Latest extension commands help (SOS,SOSEX,PSSCOR), Like !help but for specifically for SOSEX, Display this screen or details about the specified command (SOSEX), Run dumpstack on all threads and show only interesting (lock, hijacked, managed), unmanaged and managed call stack, better than !dumpheap (sosex), Unmanaged stack with arguments (kb4 limits stack to 4 frames), Unmanaged stacks without duplication, nice if have many worker threads, !dso [-verify] [top stack [bottom stack]], Objects stack trace (the actual object type and not where the method is), !mdso [/a | /r | /c:n | /t: | /mt:], Dumps object references on the stack and in CPU registers in the current context, !name2ee mscorlib.dll System.Threading.Thread. Is there a built-in function to print all the current properties and values of an object? sqlservr.exe with WinDbg (CTRL + BREAK). a) From WinDbg's command line do a !heap -p -h [HeapHandle], where [HeapHandle] is the value returned by HeapCreate . b) Alternatively you can use !heap -p -all to get addresses of all _DPH_HEAP_ROOT's of your process directly. Were going [], [] helpful cheat sheet clearly describes all available commands at this []. WinDbg is a general-purpose debugger for Windows operating system applications and code. There is no way to specify an image name that contains a space. WinDbg Preview is using the same underlying engine as WinDbg today, so all the commands, extensions, and workflows you're . The image name must match that in the EPROCESS block. By comparing this address to the list of locks shown by the !kdext*.locks extension, you can determine which threads have exclusive locks on resources. The hexadecimal number after the word ObjectTable. Did find rhyme with joined in the 18th century? Which finite projective planes can have a symmetric incidence matrix? www.windbg.info 11 Debug Symbols Executables are just sequences of raw bytes Symbols help the debugger to: map raw addresses in the executable to source-code lines analyze internal layout and data of applications Program Database PDB Files The newest Microsoft debug information format COFF and CodeView are considered deprecated. I'm working with windbg, using a script that I found somewhere on the internet, for investigating dump files. How to launch `LogOpen` Windbg command from commandline. Piecing everything together, we're going to buffer every call to OnDmlOutput, then add the contents of the buffer to the command history when the engine status switches back from "BUSY". i just tried it - it does the same here, so ded9 is probably correct. Come for the solution, stay for everything else. From WinDbg's command line do a !heap -p -a [UserAddr], where [UserAddr] is the address of your allocation ***. This extension can be used only during kernel-mode debugging. It turns out that sosex can also help with this; it can look up type information given a partial name:!mx System.Nullable* This returns clickable links, amongst which are "get_Value" which exposes a MethodTable for retrieving the content with !DumpVC. If WinDbg is already in a kernel-mode debugging session, you can open a dump file by using the .opendump (Open Dump File) command, followed by g (Go). I believe from .NET 4.0 (new CLR) thats the correct command, [] dump, open it up in windbg, and look around (there are tons of windbg cheat sheets around like this one, this one, or this one). Purpose. In a few seconds you should see this: Go to Home!analyze extension command. For many developers, WinDbg is the center of the advanced debugging universe. Use the built-in File Explorer menu to open your latest dump file, which is typically saved in the root C:\ folder, C:\minidump, or C:\Windows\minidump folder. WinDBG ( Win dows D e B u G ger) is an analytic tool used for analysing and debugging Windows crash dumps, also known as BSODs (Blue Screens of Death). How can I get the path of the dumpfile I've opened in Windbg? If Process is zero, the debugger displays all processes, and the process context is changed for each one. Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. Download WinDbg Preview After the output stops moving click the pause button on the debugger. Lists the amount of time the process has been running in kernel mode. Displays the contents of an array at the address 00ad28d0. When the proper file has been chosen, select Open. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. This place is MAGIC! Lists the amount of time that has elapsed since the process was created. The process itself can be specified by setting Process equal to the process address, setting Process equal to the process ID, or setting ImageName equal to the executable image name. When the Open Crash Dump dialog box appears, enter the full path and name of the crash dump file in the File name box, or use the dialog box to select the proper path and file name. Specifies the session that owns the desired process. Figure 1, how to find the server name in a memory dump The help documentation that comes with WinDbg is a very good source to learn about WinDbg. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, just be aware that this may not scale with a kernel mode dump @$exentry will point to nt not the module of exception kd> dx Debugger.Utility.Control.ExecuteCommand("!analyze -v").Where(a=>a.Contains("MODU")) [0x0] : MODULE_NAME: LiveKdD kd> lm 1m a @$exentry nt. Sign up for an EE membership and get your own personalized solution. Bit 1 (0x2) If the value for UserTime is exceptionally high, it might identify a process that is depleting system resources. The following table describes some of the elements in the previous example. We are excited to announce a preview version of a brand new WinDbg. ImageName Not the answer you're looking for? How to understand "round up" in this context? Instead of listing every single object present in the heap(s), this will group them by Class Name and provide us with an instance Count and TotalSize taken (in bytes). Displays a list of threads associated with the process. Use the following command: windbg -y SymbolPath -i ImagePath -z DumpFileName The -v option (verbose mode) is also useful. Accelerated Windows Memory Dump Analysis. I'll start this by saying that WinDbg Preview is using the same . 0:016> .loadby sos clr Retrieve objects queued in the Finalizable queue. What is rate of emission of heat from a body in space? Stop requiring only one assertion per unit test: Multiple assertions are fine, Going from engineer to entrepreneur takes more than just good code (Ep. For such problem, other tools may not be able to retrieve information from the file, but the dumpchk can. If this is included along with Bit 1, each thread is displayed with a stack trace. In the Open Executable dialog box, navigate to the folder that contains notepad.exe (typically, C:\Windows\System32). To get the installer, visit Download the WDK, WinDbg, and associated tools and scroll down to a section called "Get debugging tools". Accelerated Windows Memory Dump Analysis, Part 2: Kernel and Complete Spaces. AutoDebug project make use of ClrMD v2 API's to build the underlying debugger. displays information about the memory that the target process or target computer uses. Find centralized, trusted content and collaborate around the technologies you use most. with the installer of the SDK and deselecting everything else but "Debugging Tools for Windows". Command Prompt In a Command Prompt window, you can open a dump file when you launch WinDbg. The following is an example of a !process 0 0 display: The following table describes some of the elements of the !process 0 0 output. Posted at 21:03 This flag is only effective when used with Bit 0 (0x1). The hexadecimal number after the word Cid. But the accepted answer, from dave black, (since MS has updated the content), seems to just be for Windows 8, and seems to be more than just windbg. Bit 3 (0x8) If Flags is 0, only a minimal amount of information is displayed. Working with WinDbg is kind of pain in the ass and I never remember all the commands by heart, so I write down the commands I used. You may try .dump /mh command of WinDbg to create a dump with handle information on the Windows 2008 Server machine. As seen in Figure 2, you can read in detail about what !envvar is and that it gets the value from the Exts.dll and is a dump of the ENVIRONMENT VARIABLES. In the WinDbg window, select File > Start debugging > Open dump file. Lists the paged and nonpaged pool used by the process. The -stat option restricts the output to the statistical type summary. The value of Process determines whether the !process extension displays a process address or a process ID . If you already have it installed or if you are using the packaged Chromium toolchain (which includes windbg) then you can launch it using tools\win\windbg32.bat or tools\win\windbg64.bat. This can display information about simple data types, as well as structures and unions. All rights reserved. dumpchk.exe - tool used to validate a memory dump file. Displays the return address and the stack pointer for each function The display of function arguments is suppressed. Getting started with WinDbg: 1. If this is included without Bit 1 (0x2), each thread is displayed on a single line. You can also use this extension on kernel-mode dump files. The !process extension displays information about the specified process, or about all processes, including the EPROCESS block. Practical Foundations of Windows Debugging, Disassembling, Reversing. The command. If you are only displaying a single process and its user-mode state has already been refreshed (for example, with .process /p /r), it is not necessary to use this flag. Indicates whether or not the process was created by the POSIX or Interix subsystems. .foreach (t {!dumpheap -mt -short}) {.if(poi(${t}+28)>0){.printf Thread Obj: %N, Obj Address: ${t}, Name: %N \n,poi(${t}+28), poi(${t}+c)}}. How can I write this using fewer variables? The !stacks extension gives a brief summary of the state of every thread. More info about Internet Explorer and Microsoft Edge, The parenthetical comment after this heading gives the reason for the wait. Show all sync blocks that are owned by the current thread but not thinlocks, use !DumpHeap -thinlock, Displays deadlocks between SyncBlocks and/or ReaderWriterLocks, only managed (sosex), Get critical sections that threads are locked on (sieextpub), Lists all managed lock objects and CriticalSections and their owning threads (sosex), Lists all waiting threads and, if known, the locks they are waiting on (sosex), Displays all RWLocks or, if provided a RWLock address, details of the specified lock (sosex), Show data on the handle, if mutex or event can show the owner (procId.ThreadId), Displays a disassembly around the current instruction with interleaved source, IL and asm code (sosex), Displays a disassembly with interleaved source, IL and asm code (sosex). Specifies the hexadecimal address or the process ID of the process on the target computer. (LogOut/ I'm working with windbg, using a script that I found somewhere on the internet, for investigating dump files. Yes ded9 you are right. Use the following command: windbg -y SymbolPath -i ImagePath -z DumpFileName. In the final entry in the preceding example, the process address is 0x809258E0. To get source information you must additionally enable page heap in step 1 (gflags.exe /i MyApp.exe +ust +hpa) Bit 0 (0x1) Determines the application domain of an object at the specified address. The focus of this command will be the !analyze extension command. /s **** Session .symfix. 1996-2022 Experts Exchange, LLC. Process Remove the web path from your symbol path and see if it still happens. For download links and more information about WinDbg Preview, see Download WinDbg Preview. Retrieves a computer-independent description of an exception, and information about the computer state that exists for the thread when the exception occurs. In the final entry in the preceding example, the address of the process object is 0x80925c68. Will it have a bad influence on getting a student visa? Specifies the level of detail to display. 503), Mobile app infrastructure being decommissioned, How to watch a CMap (CArray) object, based on its memory address. Figure 1, must know WinDbg commands, my favorite: !sos.threadpool *NOTE A special bit of information specifically seen in Figure 1 is that when Garbage Collection is running, the CPU is set to 81% so that no new ASP.NET threads get created. It helps Developers find and resolve errors in their application, memory, system and drivers to name a few. If Process is omitted in any version of Windows, the debugger displays data only about the current system process. Select Open. The Download Now link directs you to the Windows Store, where you . To get started with Windows debugging, see Getting Started with Windows Debugging. Thanks. Did Great Valley Products demonstrate full motion video on an Amiga streaming from a SCSI hard disk in 1990? WinDbg Preview supports debugging every version of Windows 10. Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. Lists the amount of time the process has been running in user mode. Loading stuff .loadby sos mscorwks Load SOS extension (will identify sos location by loaded mscorwks path) .load c:\Windows\Microsoft.NET\Framework\v2..50727\sos Load SOS extension for .NET 2.0 .load psscor2 Load PSSCOR How do I remedy "The breakpoint will not currently be hit. Enter the world of the debugger object model. Units are the same as those of ElapsedTime. The hexadecimal number after the word Peb is the address of the process environment block. In the final entry in the preceding example, the owner is spoolss.exe. An exceptionally large working set size can be a sign of a process that is leaking memory or depleting system resources. Here is an example: Note that the address of the process object can be used as input to other extensions, such as !handle, to obtain further information. Luckily, there is $exentry which gives us the entry point and lm accepts an address with lm a