Re: BUG: optimized kprobes illegal instructions in v4.19 stable kernels

From: Greg Kroah-Hartman
Date: Fri Feb 22 2019 - 03:29:34 EST


On Fri, Feb 22, 2019 at 07:25:50AM +0100, Greg Kroah-Hartman wrote:
> On Thu, Feb 21, 2019 at 07:17:11PM -0500, Mathieu Desnoyers wrote:
> > ----- On Feb 21, 2019, at 7:10 PM, Russell King, ARM Linux linux@xxxxxxxxxxxxxxx wrote:
> >
> > > On Thu, Feb 21, 2019 at 03:02:57PM -0500, Mathieu Desnoyers wrote:
> > >> Hi Arnd, Russell, Linus,
> > >>
> > >> Can we ensure the arm32 kprobes fix I submitted gets upstream before 5.0 final ?
> > >> It takes care of an illegal instruction issue with optimized kprobes on arm32.
> > >>
> > >> Here is the current state of default kprobes configuration on arm32:
> > >> using them will trigger illegal instruction OOPS on v5.0-rc7, 4.19.24,
> > >> v4.14.102.
> > >>
> > >> My fix is in "accepted" state in the arm patch tracking system:
> > >>
> > >> https://www.arm.linux.org.uk/developer/patches/viewpatch.php?id=8834/1
> > >>
> > >> Should I send it directly to Linus as well ?
> > >
> > > Accepted means it's in my tree pending to be sent to Linus. It should
> > > now be in mainline. Have you checked?
> >
> > Hrm, why did I not see it earlier today... it's embarrassing.
> >
> > It's there indeed, all is good!
> >
> > Greg, you should be able to pick it into the stable kernels now.
>
> What is the git commit id of it?

Oh nevermind, I see it. I'll queue it up for the next round of kernel
releases after this one.

thanks,

greg k-h