Re: [v4.9 RT 0/6] futex backports

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On 2018-06-12 12:53:55 [-0500], Julia Cartwright wrote:
> On Wed, Jun 06, 2018 at 03:31:25PM +0200, Sebastian Andrzej Siewior wrote:
> Hey Sebastian-
Hi Julia,

> > as mentioned in the stable meeting, here is the futex patch that was
> > missing in the v4.9 tree :)
> >
> > The futex state in v4.9 was backported from a later kernel at the time
> > Peter made the patches. That is why all the fixes which were tagged
> > stable did not enter the v4.9 stable tree.
> 
> This is a downside to backporting major functionality to an older
> release. :(

but we found a few bugs before it hit upstream and it improved things on
the RT side, too.

> > I had a "deadlock assert in glibc" from pthread_mutex_lock() which did
> > not make a lot of sense. After comparing the futex code in latest v4.9
> > and v4.14 I identified a few patches which should be backported.
> 
> Ah, yes.  As you can see, my name was on these patches because we ran
> into this issue.  Sorry you similarly had to run into this.

no worries.

> > I haven't seen the issue after applying the patches which follow as a
> > reply to this email. They apply on top of v4.9.98-rt76.
> 
> Thanks!  I'll get these cooked into a release over the next few days.

thanks.

>    Julia

Sebastian
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