Callers of kewaitforsingleobject must be running at irql windbg extension which does its best to reconstruct the arguments when the function was called. Debugging tools for windows is included in the windows driver kit wdk. Well, what you might not realize is that starting in windows vista verifier has been enhanced to keep a log of interesting. Then you need to setup the symbol path see wrong symbols at the beginning of the article and now you can execute the. Ive been reading into the ke functions about signaled events. I can figure out that some process called suspendthread api to taskmgr. I was told i probably wouldnt need a workitem thread and looking at it i dont seem to. Introduction to kernel dispatcher objects windows drivers. Windows vista apc internals by enrico martignetti first edition, may 2009 sample code pdf version home if you are interested in the internals of windows, check out enrico martignettis book on the virtual memory manager.
Upon loading up the application dump in windbg, it displays the following output. The most important tool youre going to need in your debugging arsenal is the windows debugger or windbg. Any opinions expressed on this blog are johannes own. Windows driver kit wdk and debugging tools for windows windbg downloads. Ntdebugging blog microsoft advanced windows debugging and. Jul 01, 2008 hello, my name is louis shanks and my story starts off with a tricky little deadlock issue that i worked on recently. How to stop dpc watchdog timeout in my storport driver. Im trying to wait the firmware finish the update and then send an interrupt to the driver so that to confirm the update is success. Sign in using the sign in option on the upper right of this page. Debug universal drivers windows drivers microsoft docs. This entry has information about the startup entry named windows debugger that points to the windbg32. Anecdotally this seems to have become an issue with windows 10. The backtrace is below, youll see we appear to be blocked on ldrploaderlock im not massively familiar with windows shared library mutex code, but thats what some poking with msvc windbg reports. Kewaitforsingleobject, kiswapthread, so the second kiswapthread is from.
How do i readanalyze this dump file so i know what is causing the bso i built a pc last week and i get the bsod after a few minutes of playing any game i try. Windows system software consulting, training, development unique expertise, guaranteed results. Let me set the stage by explaining the surface level symptom, and then we will get to the good stuff. I have a windows 2008 terminal server that is locking up once or twice a day and has to be power cycled to get it back up again. Get debugging tools for windows windbg from the sdk. I only have the last dump file i got because the bsod before the last wouldnt let me start my pc in safe mode or restore to a previous date so i had to reinstall windows 10. An integral part of this technology is hotpatching, which refers to the process of applying an updated on the fly by using runtime code modification techniques although hotpatching has caught a bit of attention, suprisingly little. Debugging a debugger deadlock lean and mean johannes. Its debugger command window allows the user to issue a wide variety of commands. Windbg shows childsp kindly, it is rsp in the function so rsp of ntqueryattributesfile is fffff8800c441110. The application we are developingtesting is composed by user mode and kernel mode file system filter driver. In the sdk installation wizard, select debugging tools for windows, and deselect all other components.
Install and configure windbg for bsod analysis page 6. Sep 16, 2002 the w2ksp2 testing system is not clean. The kewaitforsingleobject routine puts the current thread into a wait state until the given dispatcher object is set to a signaled state or. Once you have windbg set up and your crash dump opened, be sure you have somewhere. On smaller devices, open the navigation menu on the upper left, then sign in using the sign in option on the upper rig.
I like to keep base algorithm and going inside ndiswaitevent dissembler windbg to check which parameters it defines for kewaitforsingleobject. Catalog of key windows kernel data structures codemachine. How to configure windbg for kernel debugging welivesecurity. Mar 27, 2017 in this post, matias porolli looks at how to configure an environment with windbg and virtual machines in order to debug drivers or code running in windows kernel space. Jan 22, 2016 virtual machine managment hangs on windows server 2012 r2 hyperv host. Windbg is used to debug the echo kernel mode sample driver code. Debugging tools for windows updates, tips, and tricks for. 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. Here we provide handson exercises that will help you get started using windbg as a usermode debugger.
Debugging windows debug kernel windbg debug ninja hangs jeff pool architecture leak x64 bugcheck bob tools matthew burrough io. With the ml switch, livekd asks the operating system to create a mirror dump without crashing the machine. But when kewaitforsingleobject is executed all threads in are blocked. Few systemsupplied drivers use semaphore objects, and, of those that do, even fewer use a binary semaphore. You can get debugging tools for windows as part of a development kit or as a standalone tool set. Virtual machine managment hangs on windows server 2012 r2.
The windows debugger windbg can be used to debug kernelmode and usermode code, analyze crash dumps, and examine the cpu registers while the code executes. Start here for an overview of debugging tools for windows. We got through the exhibition post, but now its time to get serious. This stepbystep article describes how to debug a windows service by using the windbg debugger windbg. Windbg is a kernelmode and usermode debugger that is included in debugging tools for windows. I was asked from some reasons replace inside ndis driver the ndiswaitevent on kewaitforsingleobject. See a description of the community and how to access the forums here. You can place the extension dll in your winext folder and call it like so. How do i readanalyze this dump file so i know what is. Windbg is a multipurpose debugger for the microsoft windows computer operating system, distributed by microsoft. If you want to quick install windbg, you can go for older version6.
Native kernel objects in windows are data structures that threads can directly wait on via calls to kewaitforsingleobject and its variants. But when i use dbgview to catch the actual delay, i found that it can only reach 0. Theres a shortcut here for windows 2003 to just do a. Tags debug debugging hangs hyperv ndis windbg windows wmi. Windows uses a task gate for the double fault handler because a double fault might indicate a stack overflow requiring that the double fault handler have its own.
It is important to note that the application was running on a windows xp sp3. Apr 17, 2008 microsoft advanced windows debugging and troubleshooting contributions to this blog are made by the microsoft global business support windows serviceability team. As discussed in the last post, windows 2003 sp1 introduced a technology known as hotpatching. Hi im trying to synchronize my threads with kesetevent and kewaitforsingleobject.
Couchbase server on windows 2012 r2 when calling loadlibrary. Were starting down that route by enabling the saving and loading of breakpoints. Ntdebugging blog ntdebugging blog microsoft advanced windows debugging and troubleshooting contributions to this blog are made by the microsoft global business support windows serviceability team. Im currently trying to debug a system deadlock and im having a hard time. Download windbg for windows 7, windows 8, xp, server 2008. How to debug windows bugcheck 0x9f, parameter 3 michelle. Windows hang in ntwaitforsingleobject after calling patched. On the x86 platform, this is achieved by indicating in the double fault handlers idt entry that it is a task gate and the task gate specifies the location for the new stack. Hi im having sporadic blue screens, with stop code 3, 1 dpc watchdog violation. I figured the quickest way to get going here is to go through tess ferrandezs series of debugging labs. While i still use visualstudio 2005 team system for most of my development, i want to make sure that cfix works properly with visualstudio 2008 as well. Bsod debugging a beginners guide tech support forum.
Debugging a hanging process for windows here run windbg, make sure you run the x64 version if the process dumped was a 64bit process set the symbol server path, so debugger can download the required symbols. Suspended process kideliverapc there are a lot of software problems we can experience when we are using our computer. There is a windbg extension which does its best to reconstruct the arguments when the function was called. 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. I know that my readers have a wide range of technical skills if you dont know how to use at least the basics windbg or kd to kernel debug, you may want to start there. Jun 02, 2014 in order to find the caller of suspendthread, first of all, we have to understand kideliverapc function to call kisuspendthread and apcasynchronous procedure call mechanism in windows. Osrs ntdev, ntfsd, and windbg peer help forums when you have a question or problem relating to developing windows system software, these are the forums smart people turn to. Randomly when users running vista would attempt to launch internet explorer nothing. Windbg windows debugger is an analytic tool used for analysing and debugging windows crash dumps, also known as bsods blue screens of death. When a thread calls the kewaitforsingleobject to wait for a dispatcher object or kewaitformutexobject for a mutex, the thread is put into a. This chapter from windows internals, part 2, 6th edition lists the design. Nov 27, 2015 so im an avid windows debugger user, im on build 1151 version 10.
Kewaitforsingleobject without args windows windbg windowsnt. Windows debugger runs on the host system and the kmdf echo driver runs. Download debugging tools for windows windbg windows. Windows debugging with windbg monday, june 2, 2014. Can you count the number of windbg commands you know on one hand. Ntdebugging blog ntdebugging blog microsoft advanced windows debugging and troubleshooting contributions to this blog are made by the microsoft global business support windows. The rsp value is not changed until the function returns. Debugging a hanging process oct 30, 2012 if you havent done yet you should download and install debugging tools for windows here run windbg, make sure you run the x64 version if the process dumped was a 64bit process set the symbol server path, so debugger can download the required symbols. Visual studio 2015,pipe exception nt kewaitforsingleobject. I started looking at the locks but couldnt find a dead lock so i took. Notice that it does not always succeed at finding the argument, as some of them are unknown. To debug a windows service, you can attach the windbg debugger to the process that hosts the service after the service starts, or you can configure the service to start with the windbg debugger attached so that you can troubleshoot servicestartuprelated problems. Windbg provides sourcelevel debugging for the windows kernel, kernelmode drivers, and system services, as well as usermode applications and drivers.
When i switched from windows 7 to windows 10 new sdk of course i faced this different behavior in windbg when showing callstack with command kc. Windows maintains two different virtual address spaces, the user virtual address space and the kernel. Before i dive into the next post in this series, i want to recommend reading debugging microsoft. Debugging tools for windows windbg, kd, cdb, ntsd 02222017. Ive heard that these are actually some of the best tutorials and handson experience you can get with windbg, so im e. The kewaitforsingleobject routine puts the current thread into a wait state until the given dispatcher object is set to a signaled state or optionally until the wait times out. Osr online the home page for windows driver developers. Windbg the basics for debugging crash dumps in windows. Windows debugging with windbg sunday, november 16, 2014. The waiting threads, from the waitlisthead list of kevent0x8204752c, are themselves exclusive owners of some eresources and have also waiters for those eresources. This captures the kernel memory in a way that the dump content is consistent call it a snapshot. Few device or intermediate drivers have a single drivercreated thread. Microsoft advanced windows debugging and troubleshooting contributions to this blog are made by the microsoft global business support windows serviceability team.
Getting started with windbg usermode windows drivers. This information called as the wait reason is passed to kewaitforsingleobject as a parameter. Tracking down a multiprocess deadlock ntdebugging blog. Note that windows 2003 displays more handle information than. Since tinyget appears to be dead, i just manually hit refresh on the browser windows. Once you do the installation, you can find the program in start menu all programs debugging tools for windows windbg. On 64 bit windows, rsp is a base pointer of stack frame like ebp on 32 bit platform. To access this page, you need to be a member of the windows insider program. In this tutorial, we will do something a little different, we will be using both the usermode debugger and the kernel mode debugger since i have given the introduction to both debuggers already. If you just need the debugging tools for windows, and not the windows driver kit wdk for windows 10, you can install the debugging tools as a standalone component from the windows software development kit sdk. Understanding the windows io system microsoft press store. You can see a call flow that kideliverapc, kisuspendthread, kewaitforsingleobject, kiswapthread, so the second kiswapthread is from kisuspendthread. In windows vista and later version of windows, when the system changes. Sep 01, 2015 windbg shows childsp kindly, it is rsp in the function so rsp of ntqueryattributesfile is fffff8800c441110.
837 93 217 1429 1375 230 202 1607 350 951 328 1051 1597 1308 677 298 253 1231 324 1366 820 1530 1484 783 1140 887 476 523 20 543 711