Re: [hatari-devel] Hatari segfault on cold boot with MMU + EmuTOS

[Eero Tamminen <oak@xxxxxxxxxxxxxx>]

Hi,

On 11/1/18 12:09 AM, Nicolas Pomarède wrote:
> Le 31/10/2018 à 22:53, Eero Tamminen a écrit :
> > Did you have 256k or 512k version of EmuTOS v0.9.7?
> >
> > (192k version doesn't support MMU and can't trigger the bug.)
>
> I'm using 512k version, md5sum is cee17f68e8dc0bd3a35816650e44fe90
>
> > > Can you try after removing hatari.cfg to be sure we have the same 
> > > defaults to do this test ?
> >
> > Segfaults with defaults when enabling 030 & MMU.
>
> I removed hatari.cfg and then ran :
>
> ./hatari    --machine tt --tos ~/Emul/ST/tos/emutos097.img -s 8 --ttram 
> 0 --mmu on --addr24 off
>
> I then press alt+c at the emutos boot page where it says to press shift 
> to pause the screen, but hatari never crashes for me.

Often I wait until EmuTOS boots to the desktop, then it's always been
enough to press AltGr+C 1-2 times (>90% of time, once is enough, and
second press can be done before welcome screen).

Now that I re-tried doing it right at welcome screen, there was one
time where I had to use AltGr+C a dozen times before segfault.  Maybe
EmuTOS initializes MMU right after welcome screen, or at least does
some extra MMU settings after it?


> Maybe this crash is created by some specific optimisation flags / gcc 
> version ? That would be the 1st time it happens, but who knows (I'm 
> comiling for 64 bit architecture, are you using 32 bit maybe ?)

32bit version, gcc v6.3.


> So, I can't reproduce your issue :(

As it seems to be somewhat timing related, could others on the list try 
it after EmuTOS has booted to desktop and then press AltGr+C at least
dozen times at few sec intervals?

(hatari --cpulevel 3 --mmu on --tos etos512k.img --cpu-exact on 
--compatible on)


	- Eero