Patch regressing rr has landed on Linux kernel stable branches

Kyle Huey me at kylehuey.com
Fri Jul 28 15:32:32 UTC 2017


On Thu, Jul 13, 2017 at 5:15 PM, Robert O'Callahan <robert at ocallahan.org>
wrote:

> On Thu, Jul 13, 2017 at 4:18 PM, Yichun Zhang (agentzh) <agentzh at gmail.com
> > wrote:
>
>> On Thu, Jun 29, 2017 at 4:25 PM, Robert O'Callahan wrote:
>> > This commit:
>> > https://github.com/torvalds/linux/commit/cc1582c231ea
>> > 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: https://git.kernel.org/pub/
> scm/linux/kernel/git/tip/tip.git/commit/?id=6a8a75f3235724c5941a33e287b2f9
> 8966ad14c5
> So this should be fixed soon-ish.
>

Stable kernels 3.18.63, 4.4.79, 4.9.40, and 4.12.4 contain the fix, along
with 4.13-rc2.

4.11 was EOLed before the backout was landed, unfortunately.

- Kyle
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