Hi All,
Have to come across any such issues?
Regards,
Ashok
On Tue, Aug 20, 2013 at 7:59 PM, Ashok Pitambar <ashokpitam...@gmail.com>wrote:
> Hi Dan,
>
> Yes you are right , I think in my case pBuf has corrupted memory and while
> trying to access this it
> is crashing.
>
> Regards,
> Ashok
>
>
> On Tue, Aug 20, 2013 at 7:47 PM, Dan Kennedy <danielk1...@gmail.com>wrote:
>
>> On 08/20/2013 09:08 PM, Ashok Pitambar wrote:
>>
>>> Hi Richard,
>>>
>>> If list of available buffers (*db->lookaside.pFree*) is NULL
>>> and
>>>
>>> it is assigned
>>> to pBuf and if you access pBuf->pNext it will crash. read my comments in
>>> below code
>>> snippet.
>>>
>>> There is good chance that sqlite may end up with empty
>>> lookaside pool(*db->lookaside.pFree*) list when there were many prepare
>>>
>>> statements are executed.
>>>
>>> please read my comments in code:
>>>
>>> if( db->lookaside.bEnabled ){
>>> if( n>db->lookaside.sz ){
>>> db->lookaside.anStat[1]++;
>>> }
>>> * //pBuf assigned with list of available buffers *
>>> * else if( (pBuf = db->lookaside.pFree)==0 ){*
>>>
>>> db->lookaside.anStat[2]++;
>>> }else{
>>> * //it will crash here and there is no check for NULL here*
>>> * db->lookaside.pFree = pBuf->pNext;*
>>>
>>> db->lookaside.nOut++;
>>> db->lookaside.anStat[0]++;
>>> if( db->lookaside.nOut>db->**lookaside.mxOut ){
>>> db->lookaside.mxOut = db->lookaside.nOut;
>>> }
>>> return (void*)pBuf;
>>>
>>
>> You're misreading the "else if" condition. If pBuf is set to NULL,
>> the condition will be true and the "db->lookaside.anStat[2]++;"
>> line executed. Not the block below it.
>>
>>
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>
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