Re: (ITS#5668) Invalid entryCSN generated, and slapd will not restart

[hyc@symas.com]

emmanuel.duru@atosorigin.com wrote:
> I am running windows 32 bits.
> Here is what I get from my debugging session:
> After QueryPerformanceCounter(&count ), count.QuadPart is worth
> 4243738405535005
> So the overflow comes from count.QuadPart *= 1000000;

I see. There's no reason we should be computing against the full value of the 
count; since we're only looking for the microsecond portion we should have 
stripped off everything greater. (E.g., count.QuadPart %= cFreq.QuadPart).

I'll have to play with this code a bit more, there's probably a better way to 
isolate the microseconds.

PS: I guess that means your Windows machine had an uptime of several days. 
Quite impressive, for Windows... ;)
>
>
>> -----Message d'origine-----
>> De : Howard Chu [mailto:hyc@symas.com]
>> Envoyé : mercredi 27 août 2008 13:08
>> À : openldap-its@openldap.org; Emmanuel Duru
>> Objet : Re: (ITS#5668) Invalid entryCSN generated, and slapd will not
>> restart
>>
>> ando@sys-net.it wrote:
>>> emmanuel.duru@atosorigin.com wrote:
>>>> I see that tm->tm_usub is negative, there seems to be overflows between
>>>> LARGE_INTEGER and int variables.
>> It would take over 4 billion operations in a single timer tick (on the
>> order
>> of nanoseconds) to make tm_usub overflow. That seems pretty unlikely.
>>
>>> If the problem disappears by initializing the static variables in
>>> lutil_gettime(), then it might be a compiler issue.
>> I suppose that's always possible...
>>
>> The original post shows that the tm_usec field is negative. That could
>> happen
>> if the offset we computed between the SYSTEMTIME and the
>> PerformanceCounter
>> was wrong, or if the SYSTEMTIME was adjusted while the process was
>> running.
>>
>> What version of Windows are you running? 32 or 64 bit? Can you singlestep
>> through this function with a debugger and verify all of the values? I
>> haven't
>> run this code on Windows in a long time, would take a bit of effort to
>> resurrect my build environment.
>>
>> --
>>     -- Howard Chu
>>     CTO, Symas Corp.           http://www.symas.com
>>     Director, Highland Sun     http://highlandsun.com/hyc/
>>     Chief Architect, OpenLDAP  http://www.openldap.org/project/
>
>
>
>


-- 
   -- Howard Chu
   CTO, Symas Corp.           http://www.symas.com
   Director, Highland Sun     http://highlandsun.com/hyc/
   Chief Architect, OpenLDAP  http://www.openldap.org/project/