我正在尝试调试出现异常症状的.NET应用程序。
与Windows事件日志中的相同OutOfMemory异常一起报告的堆栈跟踪记录总是不同的：
Exception Info: System.OutOfMemoryException
at System.Exception.get_Message()
at System.Exception.ToString(Boolean, Boolean)
at System.Exception.ToString()
at App.Log.AddException(System.String, System.Exception)
at App.SoftwarePlayerMonitoring.Monitor()
at System.Threading.ThreadHelper.ThreadStart_Context(System.Object)
at System.Threading.ExecutionContext.RunInternal(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object, Boolean)
at System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object, Boolean)
at System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object)
at System.Threading.ThreadHelper.ThreadStart()
Exception Info: System.OutOfMemoryException
at System.Windows.Forms.Integration.ApplicationInterop.ThreadMessageFilter(System.Windows.Interop.MSG ByRef, Boolean ByRef)
at System.Windows.Interop.ComponentDispatcherThread.RaiseThreadMessage(System.Windows.Interop.MSG ByRef)
at System.Windows.Threading.Dispatcher.PushFrameImpl(System.Windows.Threading.DispatcherFrame)
at System.Windows.Threading.Dispatcher.PushFrame(System.Windows.Threading.DispatcherFrame)
at System.Windows.Application.RunDispatcher(System.Object)
at System.Windows.Application.RunInternal(System.Windows.Window)
at System.Windows.Application.Run(System.Windows.Window)
at App.Main()
Exception Info: System.OutOfMemoryException
at System.Threading.ExecutionContext.CreateCopy()
at System.Threading.TimerQueueTimer.CallCallback()
at System.Threading.TimerQueueTimer.Fire()
at System.Threading.TimerQueue.FireQueuedTimerCompletion(System.Object)
at System.Threading.QueueUserWorkItemCallback.System.Threading.IThreadPoolWorkItem.ExecuteWorkItem()
at System.Threading.ThreadPoolWorkQueue.Dispatch()
at System.Threading._ThreadPoolWaitCallback.PerformWaitCallback()
在所有上述情况下，崩溃均报告为与以下情况有关：
Faulting module name: KERNELBASE.dll, version: 6.1.7601.18015, time stamp: 0x50b83c8a
Exception code: 0xe0434352
Fault offset: 0x0000c41f
Faulting process id: 0xf50
Faulting application start time: 0x01d52412866cc441
Faulting module path: C:\Windows\syswow64\KERNELBASE.dll
我设法捕获了处于冻结状态的应用程序的 procdump 转储，这是对它的分析：
0:000> !sos.AnalyzeOOM
Managed OOM occured after GC #29843 (Requested to allocate 0 bytes)
Reason: Low on memory during GC
Detail: SOH: Failed to reserve memory (16777216 bytes)
0:000> !dumpheap -stat
The garbage collector data structures are not in a valid state for traversal.
It is either in the "plan phase," where objects are being moved around, or
we are at the initialization or shutdown of the gc heap. Commands related to
displaying, finding or traversing objects as well as gc heap segments may not
work properly. !dumpheap and !verifyheap may incorrectly complain of heap
consistency errors.
Object <exec cmd="!ListNearObj /d 024b1000">024b1000</exec> has an invalid method table.
0:000> !vmstat
TYPE MINIMUM MAXIMUM AVERAGE BLK COUNT TOTAL
~~~~ ~~~~~~~ ~~~~~~~ ~~~~~~~ ~~~~~~~~~ ~~~~~
Free:
Small 4K 64K 36K 477 17,187K
Medium 68K 1,024K 350K 133 46,571K
Large 1,040K 14,976K 5,233K 49 256,447K
Summary 4K 14,976K 485K 659 320,207K
Reserve:
Small 4K 64K 6K 1,107 7,619K
Medium 112K 1,012K 459K 260 119,355K
Large 1,148K 20,204K 6,568K 14 91,955K
Summary 4K 20,204K 158K 1,381 218,931K
Commit:
Small 4K 64K 34K 5,826 198,431K
Medium 68K 1,024K 284K 472 134,315K
Large 1,028K 26,316K 8,689K 141 1,225,199K
Summary 4K 26,316K 241K 6,439 1,557,942K
Private:
Small 4K 64K 29K 1,442 42,219K
Medium 68K 1,024K 406K 394 160,275K
Large 1,028K 26,316K 9,867K 105 1,036,119K
Summary 4K 26,316K 638K 1,941 1,238,615K
Mapped:
Small 4K 64K 62K 2,157 135,810K
Medium 68K 1,004K 304K 18 5,487K
Large 1,512K 20,204K 6,707K 11 73,783K
Summary 4K 20,204K 98K 2,186 215,081K
Image:
Small 4K 64K 8K 3,334 28,019K
Medium 68K 984K 274K 320 87,907K
Large 1,032K 26,112K 5,314K 39 207,251K
Summary 4K 26,112K 87K 3,693 323,177K
0:000> lmv m clr
Browse full module list
start end module name
732e0000 739c1000 clr (pdb symbols) C:\Program Files (x86)\Windows Kits\10\Debuggers\x86\sym\clr.pdb\76BC9897F88B4D919C79C4FD96BFC89D2\clr.pdb
Loaded symbol image file: clr.dll
Image path: C:\Windows\Microsoft.NET\Framework\v4.0.30319\clr.dll
Image name: clr.dll
Browse all global symbols functions data
Timestamp: Thu Jul 14 20:55:59 2016 (5787EE4F)
CheckSum: 006E02E6
ImageSize: 006E1000
File version: 4.6.1590.0
Product version: 4.0.30319.0
File flags: 8 (Mask 3F) Private
File OS: 4 Unknown Win32
File type: 2.0 Dll
File date: 00000000.00000000
Translations: 0409.04b0
Information from resource tables:
CompanyName: Microsoft Corporation
ProductName: Microsoft® .NET Framework
InternalName: clr.dll
OriginalFilename: clr.dll
ProductVersion: 4.6.1590.0
FileVersion: 4.6.1590.0 built by: NETFXREL2
PrivateBuild: DDBLD400
FileDescription: Microsoft .NET Runtime Common Language Runtime - WorkStation
LegalCopyright: © Microsoft Corporation. All rights reserved.
Comments: Flavor=Retail
因此，看起来应用程序在常规垃圾回收期间崩溃了。 我也尝试过运行ANTS Memory Profiler，拍摄几个快照并进行比较，但无法将问题隔离到软件中的任何特定机制。内存使用量或句柄没有超出我的预期，并且下降，上升以及上升：
2019-06-16 13:43:51,4080000 - Physical Memory : 982784 ko - Virtual Memory : 977276 ko - Handle Count : 3089 - Thread Count : 150 - GDI Count : 342 - Total Managed Memory : 526796 ko
2019-06-16 13:44:01,4070000 - Physical Memory : 982732 ko - Virtual Memory : 977176 ko - Handle Count : 3089 - Thread Count : 148 - GDI Count : 342 - Total Managed Memory : 528396 ko
2019-06-16 13:44:11,4260000 - Physical Memory : 982760 ko - Virtual Memory : 977228 ko - Handle Count : 3118 - Thread Count : 149 - GDI Count : 342 - Total Managed Memory : 526336 ko
2019-06-16 13:44:21,4230000 - Physical Memory : 982736 ko - Virtual Memory : 977176 ko - Handle Count : 3091 - Thread Count : 148 - GDI Count : 342 - Total Managed Memory : 528002 ko
2019-06-16 13:44:31,4380000 - Physical Memory : 985688 ko - Virtual Memory : 979912 ko - Handle Count : 3099 - Thread Count : 149 - GDI Count : 342 - Total Managed Memory : 532605 ko
2019-06-16 13:44:41,4370000 - Physical Memory : 1001316 ko - Virtual Memory : 994700 ko - Handle Count : 3090 - Thread Count : 149 - GDI Count : 342 - Total Managed Memory : 534268 ko
2019-06-16 13:44:51,4740000 - Physical Memory : 1103400 ko - Virtual Memory : 1082400 ko - Handle Count : 3103 - Thread Count : 150 - GDI Count : 342 - Total Managed Memory : 673765 ko
2019-06-16 13:45:01,4850000 - Physical Memory : 1103172 ko - Virtual Memory : 1081716 ko - Handle Count : 3091 - Thread Count : 149 - GDI Count : 342 - Total Managed Memory : 678493 ko
2019-06-16 13:45:11,5000000 - Physical Memory : 1130252 ko - Virtual Memory : 1108760 ko - Handle Count : 3097 - Thread Count : 150 - GDI Count : 342 - Total Managed Memory : 697835 ko
2019-06-16 13:45:21,5010000 - Physical Memory : 1003092 ko - Virtual Memory : 1089056 ko - Handle Count : 3109 - Thread Count : 149 - GDI Count : 342 - Total Managed Memory : 530151 ko
2019-06-16 13:45:31,5130000 - Physical Memory : 1008980 ko - Virtual Memory : 1096440 ko - Handle Count : 3096 - Thread Count : 150 - GDI Count : 342 - Total Managed Memory : 527599 ko
2019-06-16 13:45:41,5270000 - Physical Memory : 1039512 ko - Virtual Memory : 1018116 ko - Handle Count : 3090 - Thread Count : 149 - GDI Count : 342 - Total Managed Memory : 608565 ko
2019-06-16 13:45:51,5310000 - Physical Memory : 1069892 ko - Virtual Memory : 1048488 ko - Handle Count : 3122 - Thread Count : 149 - GDI Count : 342 - Total Managed Memory : 637848 ko
2019-06-16 13:46:01,5430000 - Physical Memory : 1065032 ko - Virtual Memory : 1043860 ko - Handle Count : 3094 - Thread Count : 149 - GDI Count : 342 - Total Managed Memory : 644439 ko
2019-06-16 13:46:11,5420000 - Physical Memory : 991880 ko - Virtual Memory : 994636 ko - Handle Count : 3108 - Thread Count : 149 - GDI Count : 342 - Total Managed Memory : 529213 ko
2019-06-16 13:46:21,5580000 - Physical Memory : 987684 ko - Virtual Memory : 990396 ko - Handle Count : 3124 - Thread Count : 150 - GDI Count : 342 - Total Managed Memory : 529234 ko
2019-06-16 13:46:31,5610000 - Physical Memory : 991412 ko - Virtual Memory : 994088 ko - Handle Count : 3116 - Thread Count : 149 - GDI Count : 342 - Total Managed Memory : 530042 ko
2019-06-16 13:46:41,5730000 - Physical Memory : 987480 ko - Virtual Memory : 990488 ko - Handle Count : 3112 - Thread Count : 151 - GDI Count : 342 - Total Managed Memory : 528080 ko
2019-06-16 13:46:51,5730000 - Physical Memory : 987592 ko - Virtual Memory : 990612 ko - Handle Count : 3121 - Thread Count : 150 - GDI Count : 342 - Total Managed Memory : 530177 ko
我可以使用哪种故障排除技术/方法来进一步调查问题？是什么原因导致这种行为？