創(chuàng)建死鎖程序
using System; using System.Threading; namespace ConsoleApplication1 { class Program { static void Main() { new Program().Test1(); } private void Test1() { lock (this) { Console.WriteLine("Enter Test1"); new Thread(() => { Thread.Sleep(2000); Test2(); }).Start(); Console.ReadKey(); Console.WriteLine("Exit Test1"); } } private void Test2() { lock (this) { Console.WriteLine("Test2"); } } } }
運(yùn)行程序后(不要點(diǎn)擊鍵盤)創(chuàng)建.dump文件
使用WinDbg進(jìn)行分析
執(zhí)行~*e!clrstack查看所有持有和等待鎖的線程(的下一條要執(zhí)行的代碼)
0:000> ~*e!clrstack OS Thread Id: 0x26d4 (0) Child SP IP Call Site 000000000045ea38 000007ffe9ab2c5a [InlinedCallFrame: 000000000045ea38] Microsoft.Win32.Win32Native.ReadConsoleInput(IntPtr, InputRecord ByRef, Int32, Int32 ByRef) 000000000045ea38 000007ffd1e3f64e [InlinedCallFrame: 000000000045ea38] Microsoft.Win32.Win32Native.ReadConsoleInput(IntPtr, InputRecord ByRef, Int32, Int32 ByRef) 000000000045e9f0 000007ffd1e3f64e DomainNeutralILStubClass.IL_STUB_PInvoke(IntPtr, InputRecord ByRef, Int32, Int32 ByRef) 000000000045eb30 000007ffd1ea9961 System.Console.ReadKey(Boolean) 000000000045ec50 000007ff7b5501b1 ConsoleApplication1.Program.Test1() [f:\Documents\Visual Studio 2012\Projects\2012test\ConsoleApplication1\Program.cs @ 25] 000000000045ecc0 000007ff7b5500a8 ConsoleApplication1.Program.Main() [f:\Documents\Visual Studio 2012\Projects\2012test\ConsoleApplication1\Program.cs @ 11] 000000000045efd0 000007ffdac338f3 [GCFrame: 000000000045efd0] OS Thread Id: 0x2b74 (1) Unable to walk the managed stack. The current thread is likely not a managed thread. You can run !threads to get a list of managed threads in the process Failed to start stack walk: 80070057 OS Thread Id: 0x2a60 (2) Child SP IP Call Site 000000001af8f8c8 000007ffe9ab319b [DebuggerU2MCatchHandlerFrame: 000000001af8f8c8] OS Thread Id: 0x1978 (3) Unable to walk the managed stack. The current thread is likely not a managed thread. You can run !threads to get a list of managed threads in the process Failed to start stack walk: 80070057 OS Thread Id: 0x242c (4) Child SP IP Call Site 000000001ba6e9d8 000007ffe9ab319b [GCFrame: 000000001ba6e9d8] 000000001ba6eb18 000007ffe9ab319b [GCFrame: 000000001ba6eb18] 000000001ba6eb58 000007ffe9ab319b [HelperMethodFrame_1OBJ: 000000001ba6eb58] System.Threading.Monitor.Enter(System.Object) 000000001ba6ec50 000007ff7b550300 ConsoleApplication1.Program.Test2() [f:\Documents\Visual Studio 2012\Projects\2012test\ConsoleApplication1\Program.cs @ 33] 000000001ba6ecb0 000007ffd16afb65 System.Threading.ExecutionContext.RunInternal(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object, Boolean) 000000001ba6ee10 000007ffd16af8c9 System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object, Boolean) 000000001ba6ee40 000007ffd16af887 System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object) 000000001ba6ee90 000007ffd16c2fe1 System.Threading.ThreadHelper.ThreadStart() 000000001ba6f1a8 000007ffdac338f3 [GCFrame: 000000001ba6f1a8] 000000001ba6f4d8 000007ffdac338f3 [DebuggerU2MCatchHandlerFrame: 000000001ba6f4d8]
執(zhí)行!runaway查看占有鎖的線程運(yùn)行了多長時間
0:000> !runaway User Mode Time Thread Time 4:242c 0 days 0:00:00.000 3:1978 0 days 0:00:00.000 2:2a60 0 days 0:00:00.000 1:2b74 0 days 0:00:00.000 0:26d4 0 days 0:00:00.000
執(zhí)行.time看進(jìn)程運(yùn)行了多長時間
0:000> .time Debug session time: Mon May 20 17:22:13.000 2013 (UTC + 8:00) System Uptime: 0 days 7:14:13.190 Process Uptime: 0 days 0:00:11.000 Kernel time: 0 days 0:00:00.000 User time: 0 days 0:00:00.000
執(zhí)行!threads看所有的線程統(tǒng)計(jì)情況
0:000> !threads ThreadCount: 3 UnstartedThread: 0 BackgroundThread: 1 PendingThread: 0 DeadThread: 0 Hosted Runtime: no Lock ID OSID ThreadOBJ State GC Mode GC Alloc Context Domain Count Apt Exception 0 1 26d4 00000000004fe850 2a020 Preemptive 0000000002826698:0000000002827FD0 00000000004d2ab0 2 MTA 2 2 2a60 00000000005056a0 2b220 Preemptive 0000000000000000:0000000000000000 00000000004d2ab0 0 MTA (Finalizer) 4 3 242c 000000000052aca0 202b020 Preemptive 0000000002828010:0000000002829FD0 00000000004d2ab0 0 MTA
可看到線程0有兩個鎖
執(zhí)行!syncblk查看哪些線程拿到了鎖
0:000> !syncblk Index SyncBlock MonitorHeld Recursion Owning Thread Info SyncBlock Owner 2 000000000052b978 3 1 00000000004fe850 26d4 0 0000000002822e88 ConsoleApplication1.Program ----------------------------- Total 2 CCW 0 RCW 0 ComClassFactory 0 Free 0
可看到線程“00000000004fe850?”拿到了鎖,再通過!threads命令得到其線程邏輯號為0,即可切換至該線程,并通過!clrstack打印出其運(yùn)行堆棧。
備注
- ? 若表現(xiàn)為界面死掉,就直接找UI線程(STA線程就一個)
- ? 堆棧分為本地堆棧與托管堆棧,線程號也有本地線程號與托管線程號
- ? 可使用!dso (DumpStackObjects)查看當(dāng)前堆棧的所有對象
- ? 可使用?!analyze -v 分析掛掉線程的詳細(xì)情形,錯誤原因
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