我有一个非常奇怪的问题，我正试图追踪它。 .Net4中的Access_Violation。这里有一些关于我个人认为可能导致异常的事情的背景信息。
1）我有一个监视文件的进程，获取文件并使用.net中的SqlBulkCopy将其转储到数据库中。
2）然后，它遍历数据库中的文件记录，在完成后将它们标记为已处理，每组记录在多个线程中处理，因为每个组可能需要一段时间。处理完组后，它会标记通过存储过程处理的组中的那些记录 2a）处理这些组的地方是它使用SqlBulkCopy并创建一堆其他记录，用于创建要发送的通知。有一堆数据被添加/转换，因此，我发现SqlBulkCopy是迄今为止最快的方式，否则只需要很长时间就可以使用EntityFramework将大量数据放入数据库。
3）在通过成功生成的通知数据创建通知的线程中，它可以在创建通知之前加密一些数据。
4）从数据库中删除旧数据。
注意：我的代码使用标准的.Net4库，没有非托管调用。
这些进程都在以系统用户身份运行的Windows服务下运行。 而且我在描述我的问题时尽量让自己变得冗长，因为似乎没有任何人有这样的问题。
这是我尝试过但没有成功的事情 1）将服务作为控制台应用程序运行 2）将文件的处理更改为单个线程而不是多个 3）锁定一个对象，以便同时防止多个SqlBulkCopies 4）将WinDbg附加到进程以尝试捕获异常并找出崩溃的位置（我无法捕获它）。我尝试使用WinDbg，因为它看起来应该捕获异常....它没有，也许我错过了加载一些模块，或告诉捕获/忽略某个异常
这是我的WinDbg命令（粗体）及其输出。我对WinDbg了解不多，所以它只是在黑暗中拍摄。
提前感谢您的帮助， -Ed -
*This was done right after the service started so I could load the modules and ignore the first chance Access_Violation method*
(fd8.11bc): Break instruction exception - code 80000003 (first chance)
ntdll!DbgBreakPoint:
00000000`77310530 cc int 3
0:014> **sxd av**
0:014> **.loadby sos clr**
0:014> **.load c:\debugstuff\psscor4.dll**
0:014> **g**
(fd8.c18): Break instruction exception - code 80000003 (first chance)
ntdll!DbgBreakPoint:
00000000`77310530 cc int 3
0:006> **.reload**
Reloading current modules
................................................................
......................
0:006> **g**
(fd8.e24): Access violation - code c0000005 (first chance)
ntdll!NtTerminateProcess+0xa:
00000000`773115da c3 ret
0:009> **!clr**
No export clr found
0:009> **!clrstack**
OS Thread Id: 0xe24 (9)
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
0:009> **!threads**
ThreadCount: 10
UnstartedThread: 0
BackgroundThread: 9
PendingThread: 0
DeadThread: 0
Hosted Runtime: no
PreEmptive Lock
ID OSID ThreadOBJ State GC GC Alloc Context Domain Count APT Exception
XXXX 1 d10 000000000057ca00 a020 Enabled 0000000000000000:0000000000000000 00000000005659c0 0 MTA
XXXX 2 149c 0000000000582d40 b220 Enabled 00000000040ce9a0:00000000040d0958 00000000005659c0 0 MTA (Finalizer)
XXXX 3 1294 00000000005a9f30 100a220 Enabled 0000000000000000:0000000000000000 00000000005659c0 0 MTA (Threadpool Worker)
XXXX 7 cbc 000000001a396670 200b220 Enabled 0000000000000000:0000000000000000 00000000005659c0 1 MTA
XXXX b 173c 000000001a3f22b0 8009220 Enabled 0000000000000000:0000000000000000 00000000005659c0 0 MTA (Threadpool Completion Port)
XXXX 6 1b2c 000000001a3f37e0 1009220 Enabled 0000000000000000:0000000000000000 00000000005659c0 0 MTA (Threadpool Worker)
XXXX 4 ca0 000000001a3f29c0 1009220 Enabled 0000000000000000:0000000000000000 00000000005659c0 0 MTA (Threadpool Worker)
XXXX a da0 000000001a3f5420 1009220 Enabled 0000000004120ba8:0000000004122ad8 00000000005659c0 0 MTA (Threadpool Worker)
XXXX 9 b9c 000000001a3f4d10 1009220 Enabled 0000000000000000:0000000000000000 00000000005659c0 0 MTA (Threadpool Worker)
XXXX 8 1194 000000001a3f4600 1009220 Enabled 0000000004134638:0000000004134b38 00000000005659c0 0 MTA (Threadpool Worker)
0:009> **~1**
^ Illegal thread error in '~1'
0:009> **~1s**
^ Illegal thread error in '~1s'
0:009> **~**
. 9 Id: fd8.e24 Suspend: 0 Teb: 000007ff`ffef6000 Unfrozen
0:009> **~**
. 9 Id: fd8.e24 Suspend: 0 Teb: 000007ff`ffef6000 Unfrozen
0:009> **~#s;~clrstack**
ntdll!NtTerminateProcess+0xa:
00000000`773115da c3 ret
^ Syntax error in '~#s;~clrstack'
0:009> **!eestack**
0:009> **~*k**
. 9 Id: fd8.e24 Suspend: 0 Teb: 000007ff`ffef6000 Unfrozen
Child-SP RetAddr Call Site
00000000`1a8fe088 00000000`772e418b ntdll!NtTerminateProcess+0xa
00000000`1a8fe090 000007fe`f9ee8552 ntdll!RtlExitUserProcess+0x9b
00000000`1a8fe0c0 000007fe`f9ee83e4 mscoreei!RuntimeDesc::ShutdownAllActiveRuntimes+0x14a
00000000`1a8fe3b0 000007fe`f2ef8787 mscoreei!CLRRuntimeHostInternalImpl::ShutdownAllRuntimesThenExit+0x14
00000000`1a8fe3e0 000007fe`f2ef980c clr!EEPolicy::ExitProcessViaShim+0x88
00000000`1a8fe430 000007fe`f327cd38 clr!SafeExitProcess+0xdc
00000000`1a8fe6e0 000007fe`f30e8114 clr!EEPolicy::HandleFatalError+0x129
00000000`1a8fecc0 000007fe`f2ecb33c clr! ?? ::FNODOBFM::`string'+0xd51f4
00000000`1a8fecf0 000007fe`f2ecb2f2 clr!CLRVectoredExceptionHandlerPhase2+0x2d
00000000`1a8fed40 000007fe`f2ecb1a1 clr!CLRVectoredExceptionHandler+0xaf
00000000`1a8fedb0 00000000`772da59f clr!CLRVectoredExceptionHandlerShim+0x95
00000000`1a8fede0 00000000`772d8e42 ntdll!RtlpCallVectoredHandlers+0xa8
00000000`1a8fee50 00000000`77311278 ntdll!RtlDispatchException+0x22
00000000`1a8ff530 000007fe`f2e35867 ntdll!KiUserExceptionDispatcher+0x2e
00000000`1a8ffaf0 000007fe`f30b5cab clr!WKS::gc_heap::background_sweep+0x5bd
00000000`1a8ffc50 000007fe`f2e33b56 clr! ?? ::FNODOBFM::`string'+0x9f252
00000000`1a8ffca0 00000000`76bf652d clr!WKS::gc_heap::gc_thread_function+0xd3
00000000`1a8ffcd0 00000000`772ec521 KERNEL32!BaseThreadInitThunk+0xd
00000000`1a8ffd00 00000000`00000000 ntdll!RtlUserThreadStart+0x1d
0:009> **analyze -v**
Couldn't resolve error at 'nalyze -v'
0:009> **!analyze -v**
Last event: fd8.e24: Exit process 0:fd8, code 80131506
debugger time: Fri Aug 17 18:52:01.744 2012 (GMT-6)
0:009> **!analyze -f**
*******************************************************************************
* *
* Exception Analysis *
* *
*******************************************************************************
Use !analyze -v to get detailed debugging information.
Event is not an exception
Failure could not be analyzed
Last event: fd8.e24: Exit process 0:fd8, code 80131506
debugger time: Fri Aug 17 18:52:01.744 2012 (GMT-6)
0:009> **.exr 1**
Cannot read Exception record @ 0000000000000001
0:009> **.exr 0**
Cannot read Exception record @ 0000000000000000
0:009> **!dumpstack**
OS Thread Id: 0xe24 (9)
Child-SP RetAddr Call Site
000000001a8fe088 00000000772e418b ntdll!NtTerminateProcess+0xa
000000001a8fe090 000007fef9ee8552 ntdll!RtlExitUserProcess+0x9b
000000001a8fe0c0 000007fef9ee83e4 mscoreei!RuntimeDesc::ShutdownAllActiveRuntimes+0x14a
000000001a8fe3b0 000007fef2ef8787 mscoreei!CLRRuntimeHostInternalImpl::ShutdownAllRuntimesThenExit+0x14
000000001a8fe3e0 000007fef2ef980c clr!EEPolicy::ExitProcessViaShim+0x88
000000001a8fe430 000007fef327cd38 clr!SafeExitProcess+0xdc
000000001a8fe6e0 000007fef30e8114 clr!EEPolicy::HandleFatalError+0x129
000000001a8fecc0 000007fef2ecb33c clr! ?? ::FNODOBFM::`string'+0xd51f4
000000001a8fecf0 000007fef2ecb2f2 clr!CLRVectoredExceptionHandlerPhase2+0x2d
000000001a8fed40 000007fef2ecb1a1 clr!CLRVectoredExceptionHandler+0xaf
000000001a8fedb0 00000000772da59f clr!CLRVectoredExceptionHandlerShim+0x95
000000001a8fede0 00000000772d8e42 ntdll!RtlpCallVectoredHandlers+0xa8
000000001a8fee50 0000000077311278 ntdll!RtlDispatchException+0x22
000000001a8ff530 000007fef2e35867 ntdll!KiUserExceptionDispatcher+0x2e
000000001a8ffaf0 000007fef30b5cab clr!WKS::gc_heap::background_sweep+0x5bd
000000001a8ffc50 000007fef2e33b56 clr! ?? ::FNODOBFM::`string'+0x9f252
000000001a8ffca0 0000000076bf652d clr!WKS::gc_heap::gc_thread_function+0xd3
000000001a8ffcd0 00000000772ec521 KERNEL32!BaseThreadInitThunk+0xd
000000001a8ffd00 0000000000000000 ntdll!RtlUserThreadStart+0x1d
我在WinDbg中非常困惑，只是在黑暗中拍摄希望获得CLR堆栈跟踪，但是从非托管代码的堆栈跟踪判断，WinDbg事后发现了它。
有没有人对原因和/或解决方法有任何想法？ 或者从这里去哪里有什么见解？
在汉斯的评论之后，这是我的结果！VerifyHeap和它被炸毁的堆的转储。
0:000> !VerifyHeap
-verify will only produce output if there are errors in the heap
object 0000000002832a90: does not have valid MT
curr_object: 0000000002832a90
Last good object: 0000000002832a78
----------------
0:000> !do 0x2832a78
Free Object
Size: 24(0x18) bytes
0:000> dc 0x2832a78
00000000`02832a78 0055cd90 00000000 00000000 00000000 ..U.............
00000000`02832a88 0055cd90 00000000 000000b0 00000000 ..U.............
00000000`02832a98 000000a8 000007ff 00000000 00010000 ................
00000000`02832aa8 f2792140 000007fe 00453480 000007ff @!y......4E.....
00000000`02832ab8 00000000 00010000 f2792140 000007fe ........@!y.....
00000000`02832ac8 00453758 000007ff 00000000 00010000 X7E.............
00000000`02832ad8 f2792140 000007fe 00453a30 000007ff @!y.....0:E.....
00000000`02832ae8 00000000 00010000 f2792140 000007fe ........@!y.....
0:000> d
00000000`02832af8 004534f0 000007ff 00000000 00010000 .4E.............
00000000`02832b08 f2792140 000007fe 0045f2c0 000007ff @!y.......E.....
00000000`02832b18 00000000 00010000 f2792140 000007fe ........@!y.....
00000000`02832b28 004b1590 000007ff 000000d8 00000000 ..K.............
00000000`02832b38 ffffff28 ffffffff 00000000 000007ff (...............
00000000`02832b48 00000000 00000000 f1db6728 000007fe ........(g......
00000000`02832b58 00000064 00450053 0045004c 00540043 d...S.E.L.E.C.T.
00000000`02832b68 00560020 004c0041 00450055 00440020 .V.A.L.U.E. .D.