Re: 10.0 crashes on leaving X

[vom513 <vom513%gmail.com@localhost>]

> On Apr 23, 2024, at 2:00 AM, Michael <macallan1888%gmail.com@localhost> wrote:
> 
> Hello,
> 
> On Mon, 22 Apr 2024 20:44:11 -0400
> vom513 <vom513%gmail.com@localhost> wrote:
> 
>> Hello all,
>> 
>> I am testing 10.0 on an SS10, SMP (2x SM61), TGX+ (4mb) FB.
>> 
>> When the machine is running everything seems fine - nothing bad in dmesg etc.  
>> 
>> However upon shutdown - there is a kernel panic and the machine reboots (and has to fsck).
> 
> Hmm, I don't have an ss10, what I have here is an ss20 with 2x sm81 and
> cg14/SX. Somewhere I have at lease one 4MB cg6 if that's where the
> error comes from.
> 

I have an SS20 with 8mb SX.  I haven’t tried 10 on there yet as it has real HDDs vs. SD SCSI emultators on my SS10 and IPX.  Much easier to shuffle things around on the SD cards.  Trying 10 on the SS20 is on my todo list though...

>> 9.3 seems to run fine on this machine - and does not crash when exiting X.
> 
> Does it happen when exiting X, when rebooting from X, or powering off
> from X? These are all separate cases that take different code paths.
> If you can reproduce it without powering down then the panic output
> should still be in the message buffer on reboot.

I will do some more testing in this regard to try to nail down when/where this is happening.

>> I can try to take a video on shutdown and perhaps we can capture some
>> info to give some clues.  Very difficult to capture this because it’s
>> happening right before power off (assuming shutdown -p).  So nothing
>> is getting logged other than the panic scrolling on the screen before
>> the machine resets.
> 
> I'd try to reproduce it without powering down first.
> 
>> I also remember a post on port-sparc a ways back talking about
>> fixes/enhancements to X / FB bits on sparc coming in 10 ?

Hah - that was me as well.  Seems that that was a RAM issue.  I have swapped that memory out for an all new set and at least in 9.3 I don’t get the crashes.

> 
> Yes, cg14/SX gained proper 8bit acceleration, for people with 4MB cg14
> who prefer higher resolutions over colour depth, some xrender
> improvements, and cg6 got some attention as well.
> 
>> On that note - one thing I notice is that in 9.3 my FB is reported in dmesg
>> as being 2 MB as opposed to 4 MB in 10.0.  My understanding is that
>> the card is 4 MB hardware but the way it’s used it’s 2 MB in practice
>> ? (I’m probably mangling that explanation).  Just caught my eye as a
>> delta from 9.3 vs. 10.0.
> 
> CG6 with double buffering ( that is, (t)gx+ boards and possibly LX with
> VSIMM ) divide the available memory into two independent framebuffers,
> with bits to select which to read from, which to display and which to
> write into ( can be both ).
> We only ever used one of these buffers since the docs and available
> driver code implied that there is only a 2MB window through which we
> write into buffer A, B, or both. Turns out the window is bigger and we
> can in fact access all framebuffer memory as buffer A, and so does the
> blitter.
> With that we now use all available video memory.
> 
>> Let me know if there’s anything specific I need to try - and if I
>> should open a PR.
> 
> I dimly remember a thread about ss10s crashing on shutdown, with or
> without X, from a while ago.
> So, any chance you could try a -current kernel?

I’m also going to try 10 on my IPX.  And I will also add trying a -current kernel to the troubleshooting list as well.  

I will reply once I have some more/better data.  Thanks.