Hi Tony,
On Fri, 2025-08-29 at 00:45 -0700, Tony Rodriguez wrote:
> *7) Regarding the following: Thanks, this is good to know.
>
> "As for Linux, Michael Karcher also actually found a bug in the M7
> copy_{to,from}_user code which might cause the crashes on S7, see:"
>
> https://github.com/karcherm/sparc-cfu-bug-reproducer/commit/62d36f0353bd523c143131b99bd9231116c1e054
>
> 8) Regarding "please test Michael's patch series on your Linux
> distribution of choice, be it Gentoo or T2DE and report back!".
>
> Understood, want to rule out systemd first and then will try to allocate
> additional time to research this.
I think you should (cross-)build a custom kernel for your S7 with the patch
applied
as kernels without the patch will show all kinds of erratic behavior. Whether
the
behavior shows more or less prominently always depends on the kernel
configuration
used.
For example, when enabling support for Transparent Huge Pages, the bug is
triggered
already when running "apt update" on an UltraSPARC III. I haven't tested on
M7/S7/M8
yet as the prices for these are still rather permissive, so we would definitely
need
your testing.
So, I would really recommend building a custom kernel with this patch applied:
https://lore.kernel.org/all/[email protected]/
And then verify your machine runs stable again. If yes, please add your own:
Tested-by: Tony Rodriguez <[email protected]>,
Thanks,
Adrian
--
.''`. John Paul Adrian Glaubitz
: :' : Debian Developer
`. `' Physicist
`- GPG: 62FF 8A75 84E0 2956 9546 0006 7426 3B37 F5B5 F913
