Debug Assertion Failed!
Microsoft Visual C++ Debug Library
Debug Assertion Failed!
Program:E:\gyb.2.5\hotfoxd.exe
File:dbgdel.cpp
Line:52
Expression:_BLOCK_TYPE_IS_VALID(pHead->nBlockUse)
对话框如下图所示：
该对话框为调式环境下断言失败提示对话框，由释放内存时，内存块头部结构非法引发。通常是由于内存被多次释放所致。
单击重试按钮，产生minidump，分析minidump，结果如下所示：
| Microsoft (R) Windows Debugger Version 6.11.0001.404 X86 Copyright (c) Microsoft Corporation. All rights reserved.
Loading Dump File [E:\gyb.2.5\CrashLog\20120131150956\crash.dmp] User Mini Dump File: Only registers, stack and portions of memory are available
WARNING: Whitespace at start of path element Symbol search path is: SRV*d:/temp/*http://msdl.microsoft.com/download/symbols; E:\可执行文件\服务端\output\pdb Executable search path is: Windows Server 2003 Version 3790 (Service Pack 2) MP (4 procs) Free x86 compatible Product: Server, suite: Enterprise TerminalServer SingleUserTS Machine Name: Debug session time: Tue Jan 31 15:09:58.000 2012 (GMT+8) System Uptime: not available Process Uptime: 7 days 7:23:09.000 ................................................................ .......................................... This dump file has a breakpoint exception stored in it. The stored exception information can be accessed via .ecxr. eax=2f880000 ebx=003f1050 ecx=00000007 edx=7c95847c esi=2f2fefe8 edi=00005020 eip=7c95847c esp=2f2fe468 ebp=2f2fe478 iopl=0 nv up ei pl zr na pe nc cs=001b ss=0023 ds=0023 es=0023 fs=003b gs=0000 efl=00000246 ntdll!RtlRaiseException+0xd: 7c95847c c3 ret 0:378> !analyze -v ******************************************************************************* * * * Exception Analysis * * * *******************************************************************************
*** ERROR: Symbol file could not be found. Defaulted to export symbols for aced.dll - *** WARNING: Unable to verify checksum for hotfoxd.exe *** WARNING: Unable to verify checksum for BugReport.dll *** ERROR: Symbol file could not be found. Defaulted to export symbols for BugReport.dll - *** WARNING: Unable to verify checksum for ssleay32.dll *** ERROR: Symbol file could not be found. Defaulted to export symbols for ssleay32.dll - *** WARNING: Unable to verify checksum for rudp.dll *** ERROR: Symbol file could not be found. Defaulted to export symbols for rudp.dll - *** ERROR: Module load completed but symbols could not be loaded for sqloledb.rll *** WARNING: Unable to verify checksum for mysql_ext.dll *** WARNING: Unable to verify checksum for rto.dll *** WARNING: Unable to verify checksum for brsp.dll *** WARNING: Unable to verify checksum for asu.dll *** WARNING: Unable to verify checksum for monitorp.dll ************************************************************************* *** *** *** *** *** Your debugger is not using the correct symbols *** *** *** *** In order for this command to work properly, your symbol path *** *** must point to .pdb files that have full type information. *** *** *** *** Certain .pdb files (such as the public OS symbols) do not *** *** contain the required information. Contact the group that *** *** provided you with these symbols if you need this command to *** *** work. *** *** *** *** Type referenced: kernel32!pNlsUserInfo *** *** *** ************************************************************************* ************************************************************************* *** *** *** *** *** Your debugger is not using the correct symbols *** *** *** *** In order for this command to work properly, your symbol path *** *** must point to .pdb files that have full type information. *** *** *** *** Certain .pdb files (such as the public OS symbols) do not *** *** contain the required information. Contact the group that *** *** provided you with these symbols if you need this command to *** *** work. *** *** *** *** Type referenced: kernel32!pNlsUserInfo *** *** *** *************************************************************************
FAULTING_IP: msvcr80d!operator delete+a6 [f:\rtm\vctools\crt_bld\self_x86\crt\src\dbgdel.cpp @ 52] 102527a6 cc int 3
EXCEPTION_RECORD: ffffffff -- (.exr 0xffffffffffffffff) ExceptionAddress: 102527a6 (msvcr80d!operator delete+0x000000a6) ExceptionCode: 80000003 (Break instruction exception) ExceptionFlags: 00000000 NumberParameters: 3 Parameter[0]: 00000000 Parameter[1]: f9abe3d0 Parameter[2]: 1e954ed0
DEFAULT_BUCKET_ID: STATUS_BREAKPOINT
PROCESS_NAME: hotfoxd.exe
ERROR_CODE: (NTSTATUS) 0x80000003 - {
EXCEPTION_CODE: (HRESULT) 0x80000003 (2147483651) - <Unable to get error code text>
EXCEPTION_PARAMETER1: 00000000
EXCEPTION_PARAMETER2: f9abe3d0
EXCEPTION_PARAMETER3: 1e954ed0
FAULTING_THREAD: 00002478
PRIMARY_PROBLEM_CLASS: STATUS_BREAKPOINT
BUGCHECK_STR: APPLICATION_FAULT_STATUS_BREAKPOINT
LAST_CONTROL_TRANSFER: from 1026917c to 102527a6
STACK_TEXT: 2f2ffd24 1026917c 2d2e1ce8 2f2ffd44 01706746 msvcr80d!operator delete+0xa6 [f:\rtm\vctools\crt_bld\self_x86\crt\src\dbgdel.cpp @ 52] 2f2ffd30 01706746 2d2e1ce8 2d2e1ce8 0183ef14 msvcr80d!operator delete[]+0xc [f:\rtm\vctools\crt_bld\self_x86\crt\src\delete2.cpp @ 21] WARNING: Stack unwind information not available. Following frames may be wrong. 2f2ffd44 01712a38 2d2e1ce8 893bed66 2f2ffea4 aced!ACE_New_Allocator::free+0x26 2f2ffd90 004bab84 2f2fff04 2f2ffeac 2d66aa10 aced!ACE_Message_Block::release+0x138 2f2ffea4 01779d47 2f2ffecc cccccccc cccccccc hotfoxd!HTX_Socket_Sender::svc+0x114 [e:\src\server\hotfox\sockhandler.cpp @ 476] 2f2ffec0 0177a81d 26d26d44 893befea 00000000 aced!ACE_Task_Base::svc_run+0x47 2f2fff1c 0177a6d3 893befaa 2f2fff64 2d6fac38 aced!ACE_Thread_Adapter::invoke_i+0xdd 2f2fff5c 016c85b9 00000000 cccccccc 2d61f358 aced!ACE_Thread_Adapter::invoke+0xc3 2f2fff70 102047c1 2d61f358 8a572bac 00000000 aced!ace_thread_adapter+0x29 2f2fffac 10204767 2d747048 2f2fffec 7c824829 msvcr80d!_callthreadstartex+0x51 [f:\rtm\vctools\crt_bld\self_x86\crt\src\threadex.c @ 348] 2f2fffb8 7c824829 2d747048 00000000 00000000 msvcr80d!_threadstartex+0x87 [f:\rtm\vctools\crt_bld\self_x86\crt\src\threadex.c @ 331] 2f2fffec 00000000 102046e0 2d66aa10 00000000 kernel32!BaseThreadStart+0x34
FOLLOWUP_IP: msvcr80d!operator delete+a6 [f:\rtm\vctools\crt_bld\self_x86\crt\src\dbgdel.cpp @ 52] 102527a6 cc int 3
SYMBOL_STACK_INDEX: 0
SYMBOL_NAME: msvcr80d!operator delete+a6
FOLLOWUP_NAME: MachineOwner
MODULE_NAME: msvcr80d
IMAGE_NAME: msvcr80d.dll
DEBUG_FLR_IMAGE_TIMESTAMP: 4333a44e
STACK_COMMAND: ~378s; .ecxr ; kb
FAILURE_BUCKET_ID: STATUS_BREAKPOINT_80000003_msvcr80d.dll!operator_delete
BUCKET_ID: APPLICATION_FAULT_STATUS_BREAKPOINT_msvcr80d!operator_delete+a6
WATSON_STAGEONE_URL: http://watson.microsoft.com/StageOne/hotfoxd_exe/1_0_0_2465/4ee72f9a/msvcr80d_dll/8_0_50727_42/4333a44e/80000003/000527a6.htm?Retriage=1
Followup: MachineOwner --------- |
通过dv、dt进一步分析栈上变量发现，产生错误的原因是内存被多次释放所致。产生断言代码如下：
| void operator delete( void *pUserData ) { _CrtMemBlockHeader * pHead;
RTCCALLBACK(_RTC_Free_hook, (pUserData, 0));
if (pUserData == NULL) return;
_mlock(_HEAP_LOCK); /* block other threads */ __TRY
/* get a pointer to memory block header */ pHead = pHdr(pUserData);
/* verify block type */ _ASSERTE(_BLOCK_TYPE_IS_VALID(pHead->nBlockUse));
_free_dbg( pUserData, pHead->nBlockUse );
__FINALLY _munlock(_HEAP_LOCK); /* release other threads */ __END_TRY_FINALLY
return; } |
_ASSERTE(_BLOCK_TYPE_IS_VALID(pHead->nBlockUse));
该宏检查内存块是否为有效的内存块。由于内存已经被释放，内存块头部结构已经被破坏，因此，该断言将失败导致出现vc调式对话框。