关于WinDbg/SOS如何快速转储堆上所有的.NET异常
由于.net异常与任何其他异常一样是一个.net对象,因此当您(或您调用的某些代码)调用new XXException()时,它会存储在GC堆中。这意味着,如果您有一个进程的内存转储,您可以转储所有最近发生的异常,或者更确切地说,所有尚未被垃圾收集的异常。
如果您在windbg中加载了sos(.loadby sos mscorwks),则执行此操作非常简单
0:015> !dumpheap -type Exception ------------------------------ Heap 0 Address MT Size 02ea6b0c 79330a80 72 02ea75f0 7930eab4 76 … 06f57aa4 7930eab4 76 06f5829c 7930eab4 76 06f58a94 7930eab4 76 06f5928c 7930eab4 76 06f59a84 7930eab4 76 06f5a27c 7930eab4 76 06f5aa74 7930eab4 76 06f5b26c 7930eab4 76 06f5ba64 7930eab4 76 06f5c25c 7930eab4 76 06f5ca54 7930eab4 76 06f5d24c 7930eab4 76 total 319 objects ------------------------------ total 656 objects Statistics: MT Count TotalSize Class Name 79333dc0 1 12 System.Text.DecoderExceptionFallback 79333d7c 1 12 System.Text.EncoderExceptionFallback 793172f8 2 64 System.UnhandledExceptionEventHandler 79330c30 1 72 System.ExecutionEngineException 79330ba0 1 72 System.StackOverflowException 79330b10 1 72 System.OutOfMemoryException 79330a80 1 72 System.Exception 79330cc0 2 144 System.Threading.ThreadAbortException 7930eab4 646 49096 System.IO.DirectoryNotFoundException Total 656 objects
要转储有关特定异常的信息,可以使用!pe 02ea6b0c将显示堆栈、异常名称等。问题是,您必须对所有异常执行此操作,如果存在许多异常,那么这些异常可能会变得非常乏味,因此为了加快流程,您可以使用.foreach命令来自动化流程。
.foreach (ex {!dumpheap -type Exception -short}){.echo "********************************";!pe ${ex} }
这将遍历堆上的所有对象,并用!pe(!PrintException的缩写)。请注意,这也将包括并非真正异常的项,如System.Text.DecoderExceptionFallback,但由于这些不是异常,它将尝试打印出来,但败,因此您可以忽略这些。
输出如下所示:
0:015> .foreach (ex {!dumpheap -type Exception -short}){.echo "********************************";!pe ${ex} } ******************************** Exception object: 02ea6b0c Exception type: System.Exception Message: The email entered is not a valid email address InnerException: <none> StackTrace (generated): SP IP Function 024AF2C8 0FE3125E App_Code_da2s7oyo!BuggyMail.IsValidEmailAddress(System.String)+0x76 024AF2E8 0FE31192 App_Code_da2s7oyo!BuggyMail.SendEmail(System.String, System.String)+0x4a StackTraceString: <none> HResult: 80131500 There are nested exceptions on this thread. Run with -nested for details ******************************** Exception object: 02ea75f0 Exception type: System.IO.DirectoryNotFoundException Message: Could not find a part of the path 'c:idontexistlog.txt'. InnerException: <none> StackTrace (generated): SP IP Function 024AF044 792741F2 mscorlib_ni!System.IO.__Error.WinIOError(Int32, System.String)+0xc2 024AF0A0 792EB22B mscorlib_ni!System.IO.FileStream.Init(System.String, System.IO.FileMode, System.IO.FileAccess, Int32, Boolean, System.IO.FileShare, Int32, System.IO.FileOptions, SECURITY_ATTRIBUTES, System.String, Boolean)+0x48b 024AF198 792EA882 mscorlib_ni!System.IO.FileStream..ctor(System.String, System.IO.FileMode, System.IO.FileAccess, System.IO.FileShare, Int32, System.IO.FileOptions)+0x42 024AF1C0 7927783F mscorlib_ni!System.IO.StreamWriter.CreateFile(System.String, Boolean)+0x3f 024AF1D4 792777DB mscorlib_ni!System.IO.StreamWriter..ctor(System.String, Boolean, System.Text.Encoding, Int32)+0x3b 024AF1F4 797EE19F mscorlib_ni!System.IO.StreamWriter..ctor(System.String)+0x1f 024AF204 0FE31325 App_Code_da2s7oyo!Utility.WriteToLog(System.String, System.String)+0x5d StackTraceString: <none> HResult: 80070003 There are nested exceptions on this thread. Run with -nested for details ******************************** Exception object: 02ea7de8 Exception type: System.IO.DirectoryNotFoundException Message: Could not find a part of the path 'c:idontexistlog.txt'. InnerException: <none> StackTrace (generated): SP IP Function 024AEF60 792741F2 mscorlib_ni!System.IO.__Error.WinIOError(Int32, System.String)+0xc2 024AEFBC 792EB22B mscorlib_ni!System.IO.FileStream.Init(System.String, System.IO.FileMode, System.IO.FileAccess, Int32, Boolean, System.IO.FileShare, Int32, System.IO.FileOptions, SECURITY_ATTRIBUTES, System.String, Boolean)+0x48b 024AF0B4 792EA882 mscorlib_ni!System.IO.FileStream..ctor(System.String, System.IO.FileMode, System.IO.FileAccess, System.IO.FileShare, Int32, System.IO.FileOptions)+0x42 024AF0DC 7927783F mscorlib_ni!System.IO.StreamWriter.CreateFile(System.String, Boolean)+0x3f 024AF0F0 792777DB mscorlib_ni!System.IO.StreamWriter..ctor(System.String, Boolean, System.Text.Encoding, Int32)+0x3b 024AF110 797EE19F mscorlib_ni!System.IO.StreamWriter..ctor(System.String)+0x1f 024AF120 0FE31325 App_Code_da2s7oyo!Utility.WriteToLog(System.String, System.String)+0x5d StackTraceString: <none> HResult: 80070003 There are nested exceptions on this thread. Run with -nested for details
如果您还希望它打印出嵌套的异常,只需稍微更改一下命令即可
.foreach (ex {!dumpheap -type Exception -short}){.echo "********************************";!pe –nested ${ex} }
为虫子生,为虫子死,为虫子奋斗一辈子