topic Re: Access Violation Using ippsFree in Intel® Integrated Performance Primitives

Access Violation Using ippsFree

thorsan1 — Wed, 26 Apr 2006 15:10:19 GMT

Hi
I am using IPP 5.0 with VS 2005. I have some memory that I have allocated ippsMalloc_XXX and that i try to free with ippsFree. But when I call ippsFree i get an access violation. Here is some sample code:
struct SignalData
{
Ipp32fc* pos;
Ipp32fc* neg;
};

struct Frame
{
SignalData* data[NUM_BEAMS];
int estCnt;
int coeffCnt;
int corrCnt;
};

Frame* CreateFrame()
{
Frame* f = new Frame();
for(int k=0;k{
f->data = CreateSignalData();
}
f->coeffCnt = 0;
f->corrCnt = 0;
f->estCnt = 0;

return f;
}

void FreeFrame(Frame* f)
{
for(int k=0;k{
FreeSignalData(f->data);
}

delete f;
}

SignalData* CreateSignalData()
{
SignalData* s = new SignalData();
s->neg = ippsMalloc_32fc(SIGNAL_LENGTH);
s->pos = ippsMalloc_32fc(SIGNAL_LENGTH);
return s;
}

void FreeSignalData(SignalData* s)
{
ippsFree(s->neg);
ippsFree(s->pos);
delete s;
}
And its the calls to ippsFree in FreeSignalData that causes the access violation. This happens only wen I run this in debug mode.....
The error messages I get for these to function calls are: First-chance exception at 0x7c926a36 in estimationv1.0.exe: 0xC0000005: Access violation writing location 0xbaadf00d. First-chance exception at 0x7c911e58 in estimationv1.0.exe: 0xC0000005: Access violation reading location 0xbaadf00d.
thank you for any help.

Thor Andreas

Message Edited by thorsan on 04-26-200601:21 AM

Message Edited by thorsan on 04-26-200601:25 AM

Re: Access Violation Using ippsFree

bendeguy — Thu, 05 Oct 2006 21:33:35 GMT

Hi!

I have the same problem too. Did you solve it? Or can anyone help? Thx

Bendeguy

Re: Access Violation Using ippsFree

bendeguy — Thu, 05 Oct 2006 22:09:30 GMT

I tried it with new and delete operator too and got the same result. I allocate a memory area in the constructor and I write out the pointer values to see if it is changed somewhere. After the allocation my pointer has a value which never changes and when I call the ippsFree or delete[] it throws an acces violation exception. (I call te free because I got a data packet which is larger than my buffer and I want to free it and allocate a new larger one) The WinDbg says the following:

(764.e80): Access violation - code c0000005 (!!! second chance !!!)
eax=1e954798 ebx=15b00000 ecx=00000000 edx=00000000 esi=1e954790 edi=1e94c788
eip=7c910f29 esp=1ea7fd60 ebp=1ea7fd6c 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!RtlpCoalesceFreeBlocks+0x36e:
7c910f29 8b09 mov ecx,dword ptr [ecx] ds:0023:00000000=????????

I hope somebody can help. Greetings,

Bendeguy

Re: Access Violation Using ippsFree

bendeguy — Fri, 06 Oct 2006 18:20:47 GMT

Hi Nikolay!

Thank you for your advice. I've found the source of the problem(I wrote too much data to a buffer which overwrote my pointer's parameter) and I corrected it.

Bendeguy