Patch regressing rr has landed on Linux kernel stable branches

Robert O'Callahan robert at
Fri Jul 14 00:15:38 UTC 2017

On Thu, Jul 13, 2017 at 4:18 PM, Yichun Zhang (agentzh) <agentzh at>

> On Thu, Jun 29, 2017 at 4:25 PM, Robert O'Callahan wrote:
> > This commit:
> >
> > breaks rr. It landed for 4.12rc5, and we're trying to get it fixed before
> > 4.12 is released. Unfortunately it has already been backported to
> 3.18.57,
> > 4.4.72, 4.9.32 and 4.11.5 :-(. Obviously we'll try to get the 4.12 fix
> also
> > backported to those branches, but that will take a little while.
> >
> This is very unfortunate. Is there any quick and definite way to test
> if the current running Linux kernel is affected?

No, I don't think there is. You have to look at the version number.

The good news is that Ingo Molnar has submitted a backout patch to Linus
and requested backporting to stable:
So this should be fixed soon-ish.

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