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我有非常奇怪的網絡服務問題。安裝如下：在IIS7（win2008）下部署在x64單核，1gb ram機器上的6個Web服務，每個運行在專用應用程序池中。 Web服務通過LB連接到一個mysql集羣。我們正在使用mysql odbc連接器5.1.6，連接池爲.net v3.5。構建目標平臺x64。大約每3個小時，一個網絡服務開始佔用100％的CPU（或者更好地說100％的CPU核心，但是因爲它是單核心機器，它將是100％的CPU）。同時mysql服務器空閒。從任務管理器中「掛起」w3wp無效，IIS重新啓動有幫助。我期待在進程管理器，看看裏面的w3wp一個奇怪的線程與以下堆棧跟蹤，這是我無法理解：asp.net網絡服務高CPU使用率
ntoskrnl.exe!IoAcquireRemoveLockEx+0xe7
ntoskrnl.exe!memset+0x22a
ntoskrnl.exe!KeWaitForSingleObject+0x2cb
ntoskrnl.exe!KeDetachProcess+0x120d
ntoskrnl.exe!PsReturnProcessNonPagedPoolQuota+0x3a3
ntoskrnl.exe!CcSetDirtyPinnedData+0x433
myodbc5.dll!SQLTablePrivilegesW+0x22dac
myodbc5.dll!SQLTablePrivilegesW+0x2bffd
myodbc5.dll!SQLTablePrivilegesW+0x107ea
odbc32.dll!SQLAllocHandle+0xba5
odbc32.dll!SQLAllocHandle+0x9c8
mscorwks.dll!IEE+0xa913
System.Data.ni.dll+0x56f8c3
System.Data.ni.dll+0x5c1efe
mscorwks.dll!IEE+0xb0ee
mscorwks.dll!CompareAssemblyIdentity+0x2bb8f
mscorwks.dll!CompareAssemblyIdentity+0x39deb
mscorwks.dll!CompareAssemblyIdentity+0xe63d
mscorwks.dll!CertCreateAuthenticodeLicense+0x21b12f
mscorwks.dll!StrongNameTokenFromPublicKey+0x49f7
mscorwks.dll!PreBindAssembly+0x88a46
mscorlib.ni.dll+0x3988d0
mscorlib.ni.dll+0x39877a
mscorwks.dll!IEE+0xb042
mscorwks.dll!CompareAssemblyIdentity+0x2610d
mscorwks.dll!CompareAssemblyIdentity+0x26358
mscorwks.dll!CompareAssemblyIdentity+0x2ae50
mscorwks.dll!CompareAssemblyIdentity+0x97ad7
mscorwks.dll!CompareAssemblyIdentity+0x97877
mscorwks.dll!CopyPDBs+0x170f3
mscorwks.dll!InitializeFusion+0x5994
mscorwks.dll!GetMetaDataInternalInterfaceFromPublic+0x34ad9
mscorwks.dll!InitializeFusion+0x1282d
mscorwks.dll!CorExitProcess+0x802d
mscorwks.dll!InitializeFusion+0xb5db
mscorwks.dll!CertCreateAuthenticodeLicense+0x240021
mscorwks.dll!CompareAssemblyIdentity+0x97bcc
mscorwks.dll!CompareAssemblyIdentity+0x97877
mscorwks.dll!CreateAssemblyNameObject+0x2c29d
mscorwks.dll!InitializeFusion+0x5994
mscorwks.dll!GetMetaDataInternalInterfaceFromPublic+0x34ad9
mscorwks.dll!InitializeFusion+0x1282d
mscorwks.dll!StrongNameErrorInfo+0x130fe
mscorwks.dll!InitializeFusion+0xbf48
mscorwks.dll!StrongNameErrorInfo+0x76b0
kernel32.dll!BaseThreadInitThunk+0xd
ntdll.dll!RtlUserThreadStart+0x21
我也能再現那些具有VS2010部署在另一臺機器上同樣的問題並能夠連接到「掛」 W3WP，看到GC終結線程坐在一起類似下面的一個堆棧跟蹤：
[Native to Managed Transition]
System.Data.dll!System.Data.Odbc.OdbcHandle.ReleaseHandle()
[Native to Managed Transition]
[Managed to Native Transition]
mscorlib.dll!System.Runtime.InteropServices.SafeHandle.Dispose(bool disposing)
mscorlib.dll!System.Runtime.InteropServices.SafeHandle.Finalize()
[Appdomain Transition]
還有一堆棧跟蹤存在，我相信這是第一個的反射最後。
my_SQLFreeStmtExtended strmov Highest
myodbc5.dll!strmov(char * dst, const char * src) Line 38 + 0xd bytes
myodbc5.dll!cli_safe_read(st_mysql * mysql) Line 731
myodbc5.dll!cli_read_query_result(st_mysql * mysql) Line 2739 + 0x8 bytes
myodbc5.dll!mysql_next_result(st_mysql * mysql) Line 5221 + 0xd bytes
myodbc5.dll!my_SQLFreeStmtExtended(void * hstmt, unsigned short fOption, unsigned int clearAllResults) Line 427 + 0xc bytes
odbc32.dll!000007fef1d43ee9()
[Frames below may be incorrect and/or missing, no symbols loaded for odbc32.dll]
odbc32.dll!000007fef1d43d3e()
mscorwks.dll!000007fef102cd27()
System.Data.ni.dll!000007feebe73ad3()
這個問題在生產16核心機器上顯然也是可重現的。 我們已經執行代碼審查，並在我們可能可能遺留連接未關閉且未處置的地方修復/重寫代碼。 我會感謝這個問題的任何幫助，並接受任何建議，我還能看到什麼。