linux-kernel - Re: [PATCH v4.19.y 0/4] sched/deadline: Fix panic due to nested priority inheritance

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Date:   Thu, 25 Aug 2022 14:31:10 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Ankit Jain <ankitja@...are.com>
Cc:     juri.lelli@...hat.com, bristot@...hat.com, l.stach@...gutronix.de,
        suhui_kernel@....com, msimmons@...hat.com, peterz@...radead.org,
        glenn@...ora.tech, stable@...r.kernel.org,
        linux-kernel@...r.kernel.org, srivatsab@...are.com,
        srivatsa@...il.mit.edu, akaher@...are.com, amakhalov@...are.com,
        vsirnapalli@...are.com, sturlapati@...are.com,
        bordoloih@...are.com, keerthanak@...are.com
Subject: Re: [PATCH v4.19.y 0/4] sched/deadline: Fix panic due to nested
 priority inheritance

On Mon, Aug 22, 2022 at 01:13:44PM +0530, Ankit Jain wrote:
> When a CFS task that was boosted by a SCHED_DEADLINE
> task boosts another CFS task (nested priority inheritance),
> Kernel panic is observed.
> Fixing priority inheritance changes the way how sched_deadline
> attributes are being inherited from original donor task.
> 
> Additional supporting patches are added to fix throttling of
> boosted tasks.
> 
> Daniel Bristot de Oliveira (1):
>   sched/deadline: Unthrottle PI boosted threads while enqueuing
> 
> Lucas Stach (1):
>   sched/deadline: Fix stale throttling on de-/boosted tasks
> 
> Juri Lelli (1):
>   sched/deadline: Fix priority inheritance with multiple scheduling
>     classes
> 
> Hui Su (1):
>   kernel/sched: Remove dl_boosted flag comment
> 
>  include/linux/sched.h   |  13 ++--
>  kernel/sched/core.c     |  11 ++--
>  kernel/sched/deadline.c | 131 +++++++++++++++++++++++++---------------
>  3 files changed, 96 insertions(+), 59 deletions(-)
> 
> -- 
> 2.34.1
> 

Both sets of backports now queued up, thanks.

greg k-h