[vbox-dev] a rare crash

[Huihong Luo]

this doesn't happen often, just FYI
 
static PPDMASYNCCOMPLETIONTASK pdmR3AsyncCompletionGetTask(PPDMASYNCCOMPLETIONENDPOINT pEndpoint, void *pvUser)
{
 
else
{
/* Grab a free task from the head. */
AssertMsg(pEndpoint->cTasksCached > 0, ("No tasks cached but list contain more than one element\n"));
pTask = pEndpoint->pTasksFreeHead;
pEndpoint->pTasksFreeHead = pTask->pNext; <==== CRASH HERE
ASMAtomicDecU32(&pEndpoint->cTasksCached);
}
 
 
}
 
 
> VBoxVMM.dll!pdmR3AsyncCompletionGetTask(PDMASYNCCOMPLETIONENDPOINT * pEndpoint=0x020442d0, void * pvUser=0x00000000)  Line 824 + 0x5 bytes C++
  VBoxVMM.dll!PDMR3AsyncCompletionEpRead(PDMASYNCCOMPLETIONENDPOINT * pEndpoint=0x020442d0, __int64 off=845623296, const PDMDATASEG * paSegments=0x06f7fd98, unsigned int cSegments=1, unsigned int cbRead=512, void * pvUser=0x00000000, PDMASYNCCOMPLETIONTASK * * ppTask=0x06f7fdac)  Line 1076 + 0xa bytes C++
  VBoxDD.dll!drvvdAsyncIOReadSync(void * pvUser=0x059c0ea8, void * pStorage=0x030974a0, unsigned __int64 uOffset=845623296, unsigned int cbRead=512, void * pvBuf=0x03162b18, unsigned int * pcbRead=0x00000000)  Line 321 + 0x28 bytes C++
  VBoxDDU.dll!vhdFileReadSync(VHDIMAGE * pImage=0x00000000, unsigned __int64 off=845623296, void * pvBuf=0x03162b18, unsigned int cbRead=512, unsigned int * pcbRead=0x00000000)  Line 350 + 0x25 bytes C++
  VBoxDDU.dll!vhdRead(void * pBackendData=0x03162840, unsigned __int64 uOffset=846021632, void * pvBuf=0x05930000, unsigned int cbRead=1651608, unsigned int * pcbActuallyRead=0x06f7fe1c)  Line 1159 + 0x2c bytes C++
  VBoxDDU.dll!vdReadHelper(VBOXHDD * pDisk=0x06f7fe44, VDIMAGE * pImage=0x030a28b0, unsigned __int64 uOffset=68732457472, void * pvBuf=0x00000000, unsigned int cbRead=512)  Line 322 + 0x17 bytes C++
  VBoxDDU.dll!VDRead(VBOXHDD * pDisk=0x030034f0, unsigned __int64 uOffset=68732457472, void * pvBuf=0x05930000, unsigned int cbRead=512)  Line 2653 + 0xc bytes C++
  VBoxDD.dll!drvvdRead(PDMIMEDIA * pInterface=0x059c0eac, unsigned __int64 off=68732457472, void * pvBuf=0x05930000, unsigned int cbRead=512)  Line 608 + 0x1d bytes C++
  VBoxDD.dll!drvblockRead(PDMIBLOCK * pInterface=0x020ea654, unsigned __int64 off=68732457472, void * pvBuf=0x05930000, unsigned int cbRead=512)  Line 140 + 0x18 bytes C++
  VBoxDD.dll!ataReadSectors(ATADevState * s=0x00000000, unsigned __int64 u64Sector=134243081, void * pvBuf=0x05930000, unsigned int cSectors=1, bool * fRedo=0x06f7fee3)  Line 1475 C++
  VBoxDD.dll!ataReadSectorsSS(ATADevState * s=0x04411d00)  Line 1549 + 0x18 bytes C++
  VBoxDD.dll!ataAsyncIOLoop(RTTHREADINT * ThreadSelf=0x0204c138, void * pvUser=0x00000002)  Line 4872 + 0xd bytes C++
  VBoxRT.dll!rtThreadMain(RTTHREADINT * pThread=0x0204c138, unsigned int NativeThread=252, const char * pszThreadName=0x0204c1a0)  Line 637 + 0xa bytes C++
  VBoxRT.dll!rtThreadNativeMain(void * pvArgs=0x0204c138)  Line 106 + 0xb bytes C++
  msvcr80.dll!_callthreadstartex()  Line 348 + 0x6 bytes C
  msvcr80.dll!_threadstartex(void * ptd=0x031555b8)  Line 326 + 0x5 bytes C
  kernel32.dll!@BaseThreadInitThunk at 12()  + 0x12 bytes 
  ntdll.dll!___RtlUserThreadStart at 8()  + 0x27 bytes 
  ntdll.dll!__RtlUserThreadStart at 8()  + 0x1b bytes 
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