windbg 经典死锁调试
浏览数：35 /
时间：2015年06月12日
代码
// Deadlock_Debug.cpp : 定义控制台应用程序的入口点。 // #include "stdafx.h" #include "windows.h" #include <process.h> // All the thread must get all of critial_section // Classic Deadlock CRITICAL_SECTION gCritSecFirst; CRITICAL_SECTION gCritSecSecond; CRITICAL_SECTION gCritSecThird; unsigned __stdcall Thread1Func(void* dummy) { printf("Enter Thread 1 \n"); EnterCriticalSection(&gCritSecThird); { Sleep(5000); EnterCriticalSection(&gCritSecFirst); EnterCriticalSection(&gCritSecSecond); LeaveCriticalSection(&gCritSecSecond); LeaveCriticalSection(&gCritSecFirst); } LeaveCriticalSection(&gCritSecThird); printf("Exit thread func 1 \n"); return 1; } unsigned __stdcall Thread2Func(void* dummy) { printf("Enter Thread 2 \n"); EnterCriticalSection(&gCritSecFirst); EnterCriticalSection(&gCritSecSecond); { Sleep(2000); EnterCriticalSection(&gCritSecThird); Sleep(5000); LeaveCriticalSection(&gCritSecThird); } LeaveCriticalSection(&gCritSecSecond); LeaveCriticalSection(&gCritSecFirst); printf("Exit thread func 2 \n"); return 1; } int _tmain(int argc, _TCHAR* argv[]) { unsigned threadID; InitializeCriticalSection(&gCritSecFirst); InitializeCriticalSection(&gCritSecSecond); InitializeCriticalSection(&gCritSecThird); _beginthreadex( NULL, 0, &Thread1Func, NULL, 0, &threadID ); _beginthreadex( NULL, 0, &Thread2Func, NULL, 0, &threadID ); while(1); return 0; }
这是一个经典死锁，开启两个线程，一个以123的次序拿锁，一个以321次序拿锁，互相等待着对方的锁而均不释放自己手中的锁。(此处锁也指CriticalSection)
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开启WINDBG 附加死锁进程，查看0:003> ~* kv0 Id: 2b8.2f0 Suspend: 1 Teb: 7ffdf000 UnfrozenChildEBP RetAddr Args to Child WARNING: Stack unwind information not available. Following frames may be wrong.0012ff6c 0042e346 00000001 003c30b8 003c3168 Deadlock_Debug+0x2d85c0012ffb8 0042e21f 0012fff0 7c816d4f 0007da50 Deadlock_Debug+0x2e3460012ffc0 7c816d4f 0007da50 7c92e1fe 7ffd9000 Deadlock_Debug+0x2e21f0012fff0 00000000 0042b523 00000000 78746341 kernel32!BaseProcessStart+0x23 (FPO: [Non-Fpo])1 Id: 2b8.1e0 Suspend: 1 Teb: 7ffde000 UnfrozenChildEBP RetAddr Args to Child 0059fe00 7c92e9c0 7c93901b 00000030 00000000 ntdll!KiFastSystemCallRet (FPO: [0,0,0])0059fe04 7c93901b 00000030 00000000 00000000 ntdll!ZwWaitForSingleObject+0xc (FPO: [3,0,0])0059fe8c 7c92104b 004944f0 0042d5e0 004944f0 ntdll!RtlpWaitForCriticalSection+0x132 (FPO: [1,26,4])0059fe94 0042d5e0 004944f0 57565554 5b5a5958 ntdll!RtlEnterCriticalSection+0x46 (FPO: [1,0,0])WARNING: Stack unwind information not available. Following frames may be wrong.0059ff6c 0042e123 00000000 2d7b25f9 57565554 Deadlock_Debug+0x2d5e00059ffa8 0042e094 00000000 0059ffec 7c80b50b Deadlock_Debug+0x2e1230059ffb4 7c80b50b 003c2c20 57565554 5b5a5958 Deadlock_Debug+0x2e0940059ffec 00000000 0042dff0 003c2c20 00000000 kernel32!BaseThreadStart+0x37 (FPO: [Non-Fpo])2 Id: 2b8.1e4 Suspend: 1 Teb: 7ffdd000 UnfrozenChildEBP RetAddr Args to Child 0069fe00 7c92e9c0 7c93901b 00000034 00000000 ntdll!KiFastSystemCallRet (FPO: [0,0,0])0069fe04 7c93901b 00000034 00000000 00000000 ntdll!ZwWaitForSingleObject+0xc (FPO: [3,0,0])0069fe8c 7c92104b 004944c0 0042d714 004944c0 ntdll!RtlpWaitForCriticalSection+0x132 (FPO: [1,26,4])0069fe94 0042d714 004944c0 57565554 5b5a5958 ntdll!RtlEnterCriticalSection+0x46 (FPO: [1,0,0])WARNING: Stack unwind information not available. Following frames may be wrong.0069ff6c 0042e123 00000000 2d4b25f9 57565554 Deadlock_Debug+0x2d7140069ffa8 0042e094 00000000 0069ffec 7c80b50b Deadlock_Debug+0x2e1230069ffb4 7c80b50b 003c2e60 57565554 5b5a5958 Deadlock_Debug+0x2e0940069ffec 00000000 0042dff0 003c2e60 00000000 kernel32!BaseThreadStart+0x37 (FPO: [Non-Fpo])# 3 Id: 2b8.948 Suspend: 1 Teb: 7ffdc000 UnfrozenChildEBP RetAddr Args to Child 0038ffc8 7c9707a8 00000005 00000004 00000001 ntdll!DbgBreakPoint (FPO: [0,0,0])0038fff4 00000000 00000000 00000000 00000000 ntdll!DbgUiRemoteBreakin+0x2d (FPO: [Non-Fpo])////////////////////////////////////////////////////在切换到线程2 1进行观察 可以看到均是在等待CriticalSection0:003> ~2 kvChildEBP RetAddr Args to Child 0069fe00 7c92e9c0 7c93901b 00000034 00000000 ntdll!KiFastSystemCallRet (FPO: [0,0,0])0069fe04 7c93901b 00000034 00000000 00000000 ntdll!ZwWaitForSingleObject+0xc (FPO: [3,0,0])0069fe8c 7c92104b 004944c0 0042d714 004944c0 ntdll!RtlpWaitForCriticalSection+0x132 (FPO: [1,26,4])0069fe94 0042d714 004944c0 57565554 5b5a5958 ntdll!RtlEnterCriticalSection+0x46 (FPO: [1,0,0]0:003> ~1 kvChildEBP RetAddr Args to Child 0059fe00 7c92e9c0 7c93901b 00000030 00000000 ntdll!KiFastSystemCallRet (FPO: [0,0,0])0059fe04 7c93901b 00000030 00000000 00000000 ntdll!ZwWaitForSingleObject+0xc (FPO: [3,0,0])0059fe8c 7c92104b 004944f0 0042d5e0 004944f0 ntdll!RtlpWaitForCriticalSection+0x132 (FPO: [1,26,4])0059fe94 0042d5e0 004944f0 57565554 5b5a5958 ntdll!RtlEnterCriticalSection+0x46 (FPO: [1,0,0])//////////////////////////////////////////////使用!LOCKS指令查看当前的锁0:003> !locksCritSec Deadlock_Debug+944f0 at 004944f0LockCount 1RecursionCount 1OwningThread 1e4EntryCount 1ContentionCount 1*** LockedCritSec Deadlock_Debug+944d8 at 004944d8LockCount 0RecursionCount 1OwningThread 1e4EntryCount 0ContentionCount 0*** LockedCritSec Deadlock_Debug+944c0 at 004944c0LockCount 1RecursionCount 1OwningThread 1e0EntryCount 1ContentionCount 1*** Locked |
比对线程等待的锁 及个锁的拥有者和锁定情况变可以判断
线程编号1e4 也就是线程2 等待004944c0
的锁（根据堆栈的RtlEnterCriticalSection函数部分查看）
0069fe94 0042d714 004944c0 57565554
5b5a5958 ntdll!RtlEnterCriticalSection+0x46 (FPO:
[1,0,0])
而004844c0的锁由线程编号1e0 就是线程1持有
而线程编号1e0 就是线程1 等待004944f0 的锁
该所有线程编号1e4持有
0059fe94 0042d5e0 004944f0 57565554 5b5a5958
ntdll!RtlEnterCriticalSection+0x46 (FPO: [1,0,0])
死锁！！！
找到原因就好修正了。
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