Re: ABI mismatch build error for 6.17.y and rustc 1.91.0

[Greg KH <gregkh@linuxfoundation.org>]

On Tue, Nov 04, 2025 at 11:39:37AM +0100, Miguel Ojeda wrote:
> On Tue, Nov 4, 2025 at 8:43 AM Greg KH <gregkh@linuxfoundation.org> wrote:
> >
> > Ok, but why am I not seeing this on 6.18-rc?
> 
> It happens in mainline too, so a few possibilities are:
> 
>   - You have the toolchain forced to an older one (can happen e.g. if
> you are using `rustup` and you have an override on a path, even if the
> default elsewhere is another).

I am using:
	make CC=gcc-14 -j32
as my build command line.  Hm, that's a mix of gcc and rustc, does that
even work?

>   - You are not enabling doctests (KUnit).

CONFIG_KUNIT=y

>   - You are not enabling KASAN.

CONFIG_KASAN=y

The full .config can be found here:
	https://github.com/gregkh/gregkh-linux/blob/master/stable/configs/6.17.y

The issue only started showing up when I moved rustc from 1.90.0 to
1.91.0, nothing else changed on my system that I can determine.

> Please let me know if you still do not see it, because that it is
> definitely not expected.

I have those options as set above, so this is not expected :)

> I committed the fix yesterday -- it should be in tomorrow's -next.

Cool, what's the git id?  I'll be glad to try it.

thanks,

greg k-h