我们有一个旧的VB6应用程序一直冻结和/或崩溃。我们为用户设置了一个简单的快捷方式，以便在程序冻结时创建一个完整的转储。
我们现在有了一周的转储，其中大多数显示了挂起线程的一个神秘堆栈，它甚至不包括我们的任何函数，最后一个调用是user32!NtUserSetFocus.
我们真的被困在这里了…有人能帮忙吗?
0:000> kb
ChildEBP RetAddr Args to Child
0018d788 755eee3e 002609ac 00000001 755eed34 user32!NtUserSetFocus+0x15
0018d7a0 755962fa 00260f22 00000110 002609ac user32!MB_DlgProc+0x10a
0018d7cc 755bf9df 755eed34 00260f22 00000110 user32!InternalCallWinProc+0x23
0018d848 755bf784 00000000 755eed34 00260f22 user32!UserCallDlgProcCheckWow+0xd7
0018d898 755bf889 0160cf70 00000000 00000110 user32!DefDlgProcWorker+0xb7
0018d8b8 755962fa 00260f22 00000110 002609ac user32!DefDlgProcW+0x29
0018d8e4 75596d3a 755bf860 00260f22 00000110 user32!InternalCallWinProc+0x23
0018d95c 7559965e 00000000 76ee3d54 00260f22 user32!UserCallWinProcCheckWow+0x109
0018d9a0 755c206f 0160cf70 00000000 76ee3d54 user32!SendMessageWorker+0x581
0018da74 755bcf4b 75580000 00000008 00000000 user32!InternalCreateDialog+0xb9f
0018daac 755ef73c 75580000 1736f6a8 0010193a user32!InternalDialogBox+0xc1
0018db60 755efa18 00000030 ffffffff ffff0000 user32!SoftModalMessageBox+0x757
0018dcb8 755efc65 0018dcd0 00000000 755efbd1 user32!MessageBoxWorker+0x269
0018dd38 729af829 0018dd50 0010193a 0010193a user32!MessageBoxIndirectA+0x94
0018dd78 729af6a5 0018ddbc 00000000 00000000 msvbvm60!VBMessageBox2+0x92
0018dda0 729af9a0 729af7ce 0018ddbc 0018ddbc msvbvm60!MessageBoxPVoid+0x4b
0018ddd0 729a3d68 00000000 12aa8ef8 0018ddf8 msvbvm60!DlgEnableModeless+0x5e
0018de34 729a3db6 032807d4 002308e4 00000030 msvbvm60!_Scanint+0x13
0018de54 72a0c411 174be0e4 00000000 00000030 msvbvm60!RefMemberIDFromHxmod+0x39
0018de70 72a0c6f3 174be0e4 00000000 00000030 msvbvm60!EbShowError+0x3
0018de94 72a2497c 010831b8 00000000 00000000 msvbvm60!GetErrMsg+0x90
0018deb0 770fb6ad 0018df9c 00000000 0018dfec msvbvm60!SehUpdateStack+0x29
0018ded4 770fb67f 0018df9c 0018f6f8 0018dfec ntdll!ExecuteHandler2+0x26
0018def8 770fb620 0018df9c 0018f6f8 0018dfec ntdll!ExecuteHandler+0x24
0018df84 770b0163 0018df9c 0018dfec 0018df9c ntdll!RtlDispatchException+0x127
0018df84 74f3c42d 0018df9c 0018dfec 0018df9c ntdll!KiUserExceptionDispatcher+0xf
0018e4a0 72a10dcf c000008f 00000001 00000002 KERNELBASE!RaiseException+0x58
0018e4c0 72a0e228 010831b8 800a0061 0018e584 msvbvm60!CEnumConPnts::QueryInterface+0x34
0018e4d4 72a0e28c 010831b8 00000000 00000000 msvbvm60!BasicExcepDeferredFillIn+0x65
0018e4e4 72a0be99 00000061 11035a85 00000000 msvbvm60!BasicExcepDeferredFillIn+0xd2
00000000 00000000 00000000 00000000 00000000 msvbvm60!ValidateArray+0xb4
!Runaway证明这确实是挂起的线程。
0:000> !runaway
User Mode Time
Thread Time
0:ca8 0 days 0:01:00.325
8:13a4 0 days 0:00:00.171
6:10b4 0 days 0:00:00.062
10:1554 0 days 0:00:00.031
19:1598 0 days 0:00:00.000
18:a88 0 days 0:00:00.000
17:7b0 0 days 0:00:00.000
16:ba0 0 days 0:00:00.000
15:770 0 days 0:00:00.000
14:103c 0 days 0:00:00.000
13:16bc 0 days 0:00:00.000
12:17e4 0 days 0:00:00.000
11:1160 0 days 0:00:00.000
9:1194 0 days 0:00:00.000
7:dc8 0 days 0:00:00.000
5:1510 0 days 0:00:00.000
4:af0 0 days 0:00:00.000
3:e5c 0 days 0:00:00.000
2:10f4 0 days 0:00:00.000
1:ff8 0 days 0:00:00.000
!Analyze -hang -v生成以下命令:
0:000> !analyze -hang -v
*******************************************************************************
* *
* Exception Analysis *
* *
*******************************************************************************
*** WARNING: Unable to verify checksum for mscorlib.ni.dll
GetUrlPageData2 (WinHttp) failed: 12152.
FAULTING_IP:
+0
00000000 ?? ???
EXCEPTION_RECORD: ffffffff -- (.exr 0xffffffffffffffff)
ExceptionAddress: 00000000
ExceptionCode: 80000003 (Break instruction exception)
ExceptionFlags: 00000000
NumberParameters: 0
CONTEXT: 00000000 -- (.cxr 0x0;r)
eax=00000001 ebx=00000000 ecx=00000000 edx=00000000 esi=0018dcd0 edi=00260f22
eip=755a218a esp=0018d788 ebp=0018d7a0 iopl=0 nv up ei pl zr na pe nc
cs=0023 ss=002b ds=002b es=002b fs=0053 gs=002b efl=00200246
user32!NtUserSetFocus+0x15:
755a218a 83c404 add esp,4
FAULTING_THREAD: 00000000
BUGCHECK_STR: HANG
DEFAULT_BUCKET_ID: APPLICATION_HANG
PROCESS_NAME: OurProcess.exe
ERROR_CODE: (NTSTATUS) 0xcfffffff - <Unable to get error code text>
EXCEPTION_CODE: (NTSTATUS) 0xcfffffff - <Unable to get error code text>
NTGLOBALFLAG: 0
APPLICATION_VERIFIER_FLAGS: 0
APP: OurProcess.exe
ANALYSIS_VERSION: 6.3.9600.16384 (debuggers(dbg).130821-1623) x86fre
MANAGED_STACK: !dumpstack -EE
OS Thread Id: 0xca8 (0)
Current frame:
ChildEBP RetAddr Caller, Callee
DERIVED_WAIT_CHAIN:
Dl Eid Cid WaitType
-- --- ------- --------------------------
0 758.ca8 Unknown
WAIT_CHAIN_COMMAND: ~0s;k;;
BLOCKING_THREAD: 00000ca8
PRIMARY_PROBLEM_CLASS: APPLICATION_HANG
LAST_CONTROL_TRANSFER: from 755eee3e to 755a218a
STACK_TEXT:
0018d788 755eee3e 002609ac 00000001 755eed34 user32!NtUserSetFocus+0x15
0018d7a0 755962fa 00260f22 00000110 002609ac user32!MB_DlgProc+0x10a
0018d7cc 755bf9df 755eed34 00260f22 00000110 user32!InternalCallWinProc+0x23
0018d848 755bf784 00000000 755eed34 00260f22 user32!UserCallDlgProcCheckWow+0xd7
0018d898 755bf889 0160cf70 00000000 00000110 user32!DefDlgProcWorker+0xb7
0018d8b8 755962fa 00260f22 00000110 002609ac user32!DefDlgProcW+0x29
0018d8e4 75596d3a 755bf860 00260f22 00000110 user32!InternalCallWinProc+0x23
0018d95c 7559965e 00000000 76ee3d54 00260f22 user32!UserCallWinProcCheckWow+0x109
0018d9a0 755c206f 0160cf70 00000000 76ee3d54 user32!SendMessageWorker+0x581
0018da74 755bcf4b 75580000 00000008 00000000 user32!InternalCreateDialog+0xb9f
0018daac 755ef73c 75580000 1736f6a8 0010193a user32!InternalDialogBox+0xc1
0018db60 755efa18 00000030 ffffffff ffff0000 user32!SoftModalMessageBox+0x757
0018dcb8 755efc65 0018dcd0 00000000 755efbd1 user32!MessageBoxWorker+0x269
0018dd38 729af829 0018dd50 0010193a 0010193a user32!MessageBoxIndirectA+0x94
0018dd78 729af6a5 0018ddbc 00000000 00000000 msvbvm60!VBMessageBox2+0x92
0018dda0 729af9a0 729af7ce 0018ddbc 0018ddbc msvbvm60!MessageBoxPVoid+0x4b
0018ddd0 729a3d68 00000000 12aa8ef8 0018ddf8 msvbvm60!DlgEnableModeless+0x5e
0018de34 729a3db6 032807d4 002308e4 00000030 msvbvm60!_Scanint+0x13
0018de54 72a0c411 174be0e4 00000000 00000030 msvbvm60!RefMemberIDFromHxmod+0x39
0018de70 72a0c6f3 174be0e4 00000000 00000030 msvbvm60!EbShowError+0x3
0018de94 72a2497c 010831b8 00000000 00000000 msvbvm60!GetErrMsg+0x90
0018deb0 770fb6ad 0018df9c 00000000 0018dfec msvbvm60!SehUpdateStack+0x29
0018ded4 770fb67f 0018df9c 0018f6f8 0018dfec ntdll!ExecuteHandler2+0x26
0018def8 770fb620 0018df9c 0018f6f8 0018dfec ntdll!ExecuteHandler+0x24
0018df84 770b0163 0018df9c 0018dfec 0018df9c ntdll!RtlDispatchException+0x127
0018df84 74f3c42d 0018df9c 0018dfec 0018df9c ntdll!KiUserExceptionDispatcher+0xf
0018e4a0 72a10dcf c000008f 00000001 00000002 KERNELBASE!RaiseException+0x58
0018e4c0 72a0e228 010831b8 800a0061 0018e584 msvbvm60!CEnumConPnts::QueryInterface+0x34
0018e4d4 72a0e28c 010831b8 00000000 00000000 msvbvm60!BasicExcepDeferredFillIn+0x65
0018e4e4 72a0be99 00000061 11035a85 00000000 msvbvm60!BasicExcepDeferredFillIn+0xd2
00000000 00000000 00000000 00000000 00000000 msvbvm60!ValidateArray+0xb4
FOLLOWUP_IP:
msvbvm60!VBMessageBox2+92
729af829 8bd8 mov ebx,eax
SYMBOL_STACK_INDEX: e
SYMBOL_NAME: msvbvm60!VBMessageBox2+92
FOLLOWUP_NAME: MachineOwner
MODULE_NAME: msvbvm60
IMAGE_NAME: msvbvm60.dll
DEBUG_FLR_IMAGE_TIMESTAMP: 4a5bda6c
STACK_COMMAND: ~0s ; kb
BUCKET_ID: HANG_msvbvm60!VBMessageBox2+92
FAILURE_BUCKET_ID: APPLICATION_HANG_cfffffff_msvbvm60.dll!VBMessageBox2
ANALYSIS_SOURCE: UM
FAILURE_ID_HASH_STRING: um:application_hang_cfffffff_msvbvm60.dll!vbmessagebox2
FAILURE_ID_HASH: {e6dc63dc-251f-a6d5-c66e-f5e07e418955}
Followup: MachineOwner
---------
首先我要弄清楚它在做什么。当它挂起时，获取几个崩溃转储，并比较堆栈以找出它到底在哪里旋转。还有一些符号有较大的偏移量(user32!InternalCreateDialog+0xb9f)，你使用符号服务器吗?