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Date: Wed, 9 Jun 2021 09:03:12 +0200
From: Arnd Bergmann <>
Cc: Rich Felker <>, Markus Wichmann <>, 
	Florian Weimer <>
Subject: Re: Backwards kernel compatibility

On Wed, Jun 2, 2021 at 1:52 PM Arnd Bergmann <> wrote:
> On Wed, Jun 2, 2021 at 9:38 AM Martin Vajnar <> wrote:

> >
> > The main source of overhead comes from the kernel 4.4 which on arm64
> > produces stack traces when not implemented syscall is invoked:
> >
> >
> That is clearly a bug that was fixed in mainline and backported to linux-4.14
> but not 4.4 or 4.9. I've sent a manual backport for inclusion in those kernels
> now.

The backport is now merged into the stable kernel trees and should be part of


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