[hatari-devel] Latest Hatari HG version gets stuck sometimes

[npomarede at corp.free.fr]

On Fri, 17 Jul 2009, Thomas Huth wrote:

> On Fri, 17 Jul 2009 00:38:06 +0200 (CEST)
> npomarede at corp.free.fr wrote:
>
>> While trying to fix another demo, I tried to restore a fresh snapshot
>> and was lucky enough to get the reported crash problem when restoring
>> it :)
>>
>> This is with the latest head sources, so with the sequence :
>>
>>          Video_ClearOnVBL();
>>
>>          Video_StartInterrupts(PendingCyclesOver);
>>
>>          ShortCut_ActKey();
>>
>> I get the same wrong value for LineCycle in ConvertPosition, but this
>> is due to a wrong value of nHBL. My value is 53, but this is the
>> first line of the VBL, it should be 0 !
>>
>> Adding
>>  	fprintf ( stderr, "capt %d\n" , nHBL );
>>
>> at the end of Video_MemorySnapShot_Capture, I can see that the
>> restored value for nHBL is indeed 53. So the problem is in the saved
>> snapshot.
>>
>> Thomas, do you know how this is possible ? I thought snapshots were
>> captured only during the VBL handler, which means nHBL should be 0
>> and saved this way.
>
> I don't know ... nHBL should always be cleared on Video_ClearOnVBL !?!
> How did you create the snapshot (shortcut? GUI? Python-UI?)?
> Can you somehow reproduce such faulty snapshots? Then you could add an
> assert(nHBL == 0) to Video_MemorySnapShot_Capture to analyse the
> problem with gdb.
>

Yes, it should be cleared by Video_ClearOnVBL.
But perhaps the snapshot procedure can interrupt hatari at another place 
than in the VBL ? In my case, I used the gui, F12, then save snapshot.

I wasn't able to reproduce, but I will add some debug traces to see if I 
can trigger it again.

Nicolas