git: df8dd6025af8 - main - amd64: stop using top of the thread' kernel stack for FPU user save area

[Mark Johnston]

On Thu, Sep 23, 2021 at 09:49:47PM +0200, Mateusz Guzik wrote:
> On 9/21/21, Konstantin Belousov <kib at freebsd.org> wrote:
> > The branch main has been updated by kib:
> >
> > URL:
> > https://cgit.FreeBSD.org/src/commit/?id=df8dd6025af88a99d34f549fa9591a9b8f9b75b1
> >
> > commit df8dd6025af88a99d34f549fa9591a9b8f9b75b1
> > Author:     Konstantin Belousov <kib at FreeBSD.org>
> > AuthorDate: 2021-09-13 21:05:47 +0000
> > Commit:     Konstantin Belousov <kib at FreeBSD.org>
> > CommitDate: 2021-09-21 17:20:15 +0000
> >
> >     amd64: stop using top of the thread' kernel stack for FPU user save
> > area
> >
> 
> This causes KASAN to crash on boot:
> 
> panic: ASan: Invalid access, 192-byte read at 0xffffffff84105f40,

Try grabbing https://reviews.freebsd.org/D32057