Re: [hatari-devel] MEMWATCH freezes Hatari

[Uwe Seimet <Uwe.Seimet@xxxxxxxxx>]

Today (note that I did not recompile anything ...) the situation is a
bit different. PD does not crash anymore, but Tempus Word still does.
This time, when PMMU and PF and CE are enabled, Tempus Word crashes with
a double bus fault. When only PMMU is enabled it freezes, then there are
14 bombs, and after some time (about 5 seconds) Hatari crashes with a
segfault.
Even though I compiled with -g gdb only shows this:

Thread 1 "hatari" received signal SIGSEGV, Segmentation fault.
0x00005555578a4f3c in regs ()
(gdb) bt
#0  0x00005555578a4f3c in regs ()
#1  0x0000000000000000 in ?? ()

So all in all, the symptoms of the problem are still the same: Either
freezing or a double bus fault.

> > Note that when I am testing I start Hatari without PMMU, CE and PF
> > enabled. I enable them by pressing F12 and reconfiguring, and then
> > resetting Hatari. Maybe this has some relevance.
> 
> Does it happen if only more compatible/prefetch (I don't know how it is
> called in Hatari) and data cache is enabled? (No cycle-exact)
> 
> There is still something wrong with data cache emulation (at least when
> also MMU is enabled, this is also not a new bug) but it is really
> difficult to debug because actual problem may have happened thousands of
> instructions ago before it causes any visible side-effects..
> 
> I can only duplicate it with Amix that outputs "illegal instruction"
> during boot but there is no illegal instruction exceptions being
> generated so I am not really sure what it means. Unfortunately it also
> continues booting (instead of hanging/halting). No data cache emulation,
> no above error.
> 
>