Re: Linux kernel stability fixes for older SPARCs

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Hi John,

thank you for your email. Happy to hear from you!

> On 3. Sep 2024, at 10:15, John Paul Adrian Glaubitz <glaubitz@xxxxxxxxxxxxxxxxxxx> wrote:
> 
> Hi Rene,
> 
> according to these posts [1][2] by Iggi, you figured out the stability problem

No, we are just sometimes lucky it run that long stable. I was only made aware
recently that sun4u was not 100% and my fasted UltraSPARC until some year ago
was only a 360MHz Ultra5 until I was donated a Sun Blade 1000 recently. I see
some MM corruption that I wanted to hunt next.

> with newer kernels on older SPARC machines. There has been a regression on older
> SPARCs since around kernel 4.19.x which I haven't gotten around to bisecting yet.

Happy to bi-sect. I guess you mean random memory corruption I see or anything
else?

If you have issues to bi-sect just let us know for any arch. Given T2’s cross-compile
support and I have most hardware in my museum now, I can usually bisect issues
within a day or two.

> If you've found and fixed the bug in question, it would be great if you could share
> your fix with the community and maybe whip up a kernel patch to fix the bug upstream.

Of course - all patches are always nicely sorted in our public and nicely readable
SVN tree in any case.

	https://t2linux.com

> Newer SPARCs are not affected by this bug, although there are other issues.

You mean sun4v? I found a cheap T4-1 some month ago, and T2/Linux appears
to run stable on that. Any list of issues w/ sun4v I should be aware of?

Thanks,
	René

> Thanks,
> Adrian
> 
>> [1] https://x.com/Iggi76123640/status/1828396228444389600
>> [2] https://x.com/Iggi76123640/status/1828673611080589641
> 
> -- 
> .''`.  John Paul Adrian Glaubitz
> : :' :  Debian Developer
> `. `'   Physicist
>  `-    GPG: 62FF 8A75 84E0 2956 9546  0006 7426 3B37 F5B5 F913

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