It seems VHD format is not stable as VDI. VBoxSVC.exe pretty much always
crashes when a snapshot is being discarded. I am running an XP guest on Vista
host. The VHD's capacity is over 100G.
If you look at the following stack, the crash was caused by
pImage->pszParentFilename is NULL inside
static int vhdDynamicHeaderUpdate(PVHDIMAGE pImage) in VHDHDDCore.cpp
I used the very recent SVN source.
//////////
vboxsvc.exe crash stack:
VBoxRT.dll!RTPathFilename(const char * pszPath=0x00000000) Line 240 C++
VBoxDDU.dll!vhdDynamicHeaderUpdate(VHDIMAGE * pImage=0x00000000) Line 362 +
0x12 bytes C++
VBoxDDU.dll!vhdFlush(void * pBackendData=0x01c2caf0) Line 1157 C++
VBoxDDU.dll!vhdClose(void * pBackendData=0x01c2caf0, bool fDelete=false)
Line 880 + 0x6 bytes C++
VBoxDDU.dll!VDClose(VBOXHDD * pDisk=0x01e0e218, bool fDelete=false) Line
2268 C++
VBoxSVC.exe!HardDisk::taskThread(RTTHREADINT * thread=0x00000000, void *
pvUser=0x00e0e2b8) Line 4063 + 0xb bytes C++
VBoxSVC.exe!HardDisk::Task::runNow() Line 220 C++
VBoxSVC.exe!HardDisk::mergeTo(HardDisk::MergeChain * aChain=0x01c2cfe0,
ComObjPtr<Progress,ComStrongRef> * aProgress=0x01e06fe8, bool aWait=true) Line
2844 + 0x9 bytes C++
VBoxSVC.exe!HardDisk::discard(ComObjPtr<Progress,ComStrongRef> &
aProgress={...}, HardDisk::MergeChain * aChain=0x01c2cfe0) Line 2248 + 0xe
bytes C++
VBoxSVC.exe!SessionMachine::discardSnapshotHandler(SessionMachine::DiscardSnapshotTask
& aTask={...}) Line 10584 C++
VBoxSVC.exe!SessionMachine::DiscardSnapshotTask::handler() Line 8251 + 0x9
bytes C++
VBoxSVC.exe!SessionMachine::taskHandler(RTTHREADINT * __formal=0x01c32108,
void * pvUser=0x01e06fe0) Line 11412 C++
VBoxRT.dll!rtThreadMain(RTTHREADINT * pThread=0x01c32108, unsigned int
NativeThread=4312, const char * pszThreadName=0x01c32170) Line 635 + 0xa
bytes C++
VBoxRT.dll!rtThreadNativeMain(void * pvArgs=0x01c32108) Line 106 + 0xb
bytes C++
msvcr80.dll!__endthreadex() + 0x3b bytes
msvcr80.dll!__endthreadex() + 0xc7 bytes
kernel32.d...@basethreadinitthunk@12() + 0x12 bytes
ntdll.dll!___rtluserthreadst...@8() + 0x27 bytes
ntdll.dll!__rtluserthreadst...@8() + 0x1b bytes _______________________________________________
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