经验总结

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记一次 .NET 某企业OA后端服务 卡死分析( 二 )

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一般来说卦中的 Lock Count 列表示当前线程所持有的托管锁个数，现在显示的 -00001 应该是命令不起效果了 。。。不过没关系，我们还可以通过 !syncblk 来看下 lock 的情况，毕竟 95% 的锁场景都会用到它 。
0:000> !syncblkIndex         SyncBlock MonitorHeld Recursion Owning Thread Info          SyncBlock Owner  176 000002097E0DA1D8           17         1 00000209216A3500 132c8  71   00000209002c6a68 System.Object  191 000002097E0DAC88           27         1 000002097ADC54F0 1ae90  53   00000209000185e8 System.IO.TextWriter+SyncTextWriter-----------------------------Total           270CCW             0RCW             0ComClassFactory 0Free            32从卦中的 MonitorHeld=27 来看，表示这个 SyncTextWriter 对象当前有 13 个线程在等待，有 1 个线程在持有，那这个线程为什么没有退出呢？ 接下来可以切到 53 号线程上，查看下它的线程栈 。
0:053> ~~[1ae90]sntdll!NtWriteFile+0x14:00007ffd`a70df774 c3              ret0:053> !clrstackOS Thread Id: 0x1ae90 (53)        Child SP               IP Call Site00000070505BDE88 00007ffda70df774 [InlinedCallFrame: 00000070505bde88] Interop+Kernel32.WriteFile(IntPtr, Byte*, Int32, Int32 ByRef, IntPtr)00000070505BDE88 00007ffd32a7cbe2 [InlinedCallFrame: 00000070505bde88] Interop+Kernel32.WriteFile(IntPtr, Byte*, Int32, Int32 ByRef, IntPtr)00000070505BDE50 00007ffd32a7cbe2 ILStubClass.IL_STUB_PInvoke(IntPtr, Byte*, Int32, Int32 ByRef, IntPtr)00000070505BDF20 00007ffd3a2d6971 System.ConsolePal+WindowsConsoleStream.WriteFileNative(IntPtr, Byte[], Int32, Int32, Boolean)00000070505BDF80 00007ffd3a2d672f System.ConsolePal+WindowsConsoleStream.Write(Byte[], Int32, Int32) [/_/src/libraries/System.Console/src/System/ConsolePal.Windows.cs @ 1131]00000070505BDFD0 00007ffd377c05d9 System.IO.StreamWriter.Flush(Boolean, Boolean) [/_/src/libraries/System.Private.CoreLib/src/System/IO/StreamWriter.cs @ 260]00000070505BE050 00007ffd3a2d6687 System.IO.StreamWriter.WriteLine(System.String)00000070505BE0D0 00007ffd3a2d6472 System.IO.TextWriter+SyncTextWriter.WriteLine(System.String) [/_/src/libraries/System.Private.CoreLib/src/System/IO/TextWriter.cs @ 880]00000070505BE130 00007ffd3a2d640d System.Console.WriteLine(System.String) [/_/src/libraries/System.Console/src/System/Console.cs @ 716]00000070505BE160 00007ffd3a2375ab HCloud.xxx+d__2.MoveNext()00000070505BEAE0 00007ffd37e19365 System.Runtime.CompilerServices.AsyncMethodBuilderCore.Start[[System.__Canon, System.Private.CoreLib]](System.__Canon ByRef) [/_/src/libraries/System.Private.CoreLib/src/System/Runtime/CompilerServices/AsyncMethodBuilderCore.cs @ 63]00000070505BEB40 00007ffd3a235cc3 HCloud.xxxx.Execute(Quartz.IJobExecutionContext)00000070505BEBB0 00007ffd3a231264 Quartz.xxx+d__9.MoveNext()00000070505BEE90 00007ffd3a230183 System.Runtime.CompilerServices.AsyncMethodBuilderCore.Start[[Quartz.Core.JobRunShell+d__9, Quartz]](d__9 ByRef) [/_/src/libraries/System.Private.CoreLib/src/System/Runtime/CompilerServices/AsyncMethodBuilderCore.cs @ 63]00000070505BEF10 00007ffd3a2300db System.Runtime.CompilerServices.AsyncTaskMethodBuilder.Start[[Quartz.Core.JobRunShell+d__9, Quartz]](d__9 ByRef) [/_/src/libraries/System.Private.CoreLib/src/System/Runtime/CompilerServices/AsyncTaskMethodBuilder.cs @ 33]00000070505BEF40 00007ffd3a230082 Quartz.xxxxl.Run(System.Threading.CancellationToken)00000070505BF020 00007ffd3a22ffc3 Quartz.Core.QuartzSchedulerThread+c__DisplayClass28_0.b__0()00000070505BF060 00007ffd3939b71a System.Threading.Tasks.Task`1[[System.__Canon, System.Private.CoreLib]].InnerInvoke() [/_/src/libraries/System.Private.CoreLib/src/System/Threading/Tasks/Future.cs @ 507]00000070505BF0C0 00007ffd37d54431 System.Threading.ExecutionContext.RunFromThreadPoolDispatchLoop(System.Threading.Thread, System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object) [/_/src/libraries/System.Private.CoreLib/src/System/Threading/ExecutionContext.cs @ 300]00000070505BF110 00007ffd37d53657 System.Threading.Tasks.Task.ExecuteWithThreadLocal(System.Threading.Tasks.Task ByRef, System.Threading.Thread) [/_/src/libraries/System.Private.CoreLib/src/System/Threading/Tasks/Task.cs @ 2352]00000070505BF1C0 00007ffd37d50e04 System.Threading.ThreadPoolWorkQueue.Dispatch() [/_/src/libraries/System.Private.CoreLib/src/System/Threading/ThreadPool.cs @ 677]00000070505BF690 00007ffd925ea7a3 [DebuggerU2MCatchHandlerFrame: 00000070505bf690]

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