>
> On mer. 13 août 2025 09:04:22, Aaron Rainbolt wrote:
> > On Wed, Aug 13, 2025 at 7:39 AM Simon Chopin <simon.chopin@canonical.com> wrote:
> [snip]
> > > Now, if I'm wrong about lack of major breakage, you want to watch out
> > > for the following symptoms in your autopkgtests, build logs, or bug
> > > reports:
> > >
> > > * FTBFS due to missing termio.h
> > > Your package is using some really outdated interfaces that were
> > > already obsolete when the Berlin Wall fell. Please look into
> > > termios.h.
> > > * ARM issues only on modern ARM64 processors (e.g. Apple M4), around coroutine
> > > or exception-handling code. Tobias, do we even support running on M4
> > > hardware!?
> >
> > Does "M4 hardware" mean running directly on Apple's M4 CPU bare metal,
> > or does it also include running inside a virtual machine under
> > Parallels, VMware Fusion, UTM, etc.? If this is a problem inside
> > virtual machines, I personally don't think that would be acceptable.
> > If it's a baremetal-only issue, then meh, probably not that big of a
> > deal. Just my 2 cents on the matter.
>
> Don't worry too much about this. I'm not saying those systems are
> broken, just that *if* you see issues looking like that on those systems
> then this upload might be the cause.
>
> The details are a bit beyond my knowledge, but basically the SME matrix
> storage is disabled when calling setjmp() for consistency with
> longjmp(). It's unlikely to affect Ubuntu since we don't generate those
> opcodes by default and even then, why would you call setjmp() in the
> middle of matrix operations, but OTOH it's the kind of thing that's a
> nightmare to debug, which is why I figured I would mention it.
>
> As to whether or not your VMs are affected, I wouldn't know. Check
> /proc/cpuinfo to see if you have SME in your VM?
No native Linux support for M3+ at the moment but I would expect it to
be available
in QEMU VMs on newer apple machines and that has probably a notable user base.
It doesn't sound like a particularly common bug to hit as you said though.
>
> Cheers,
> Simon
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