linux-kernel - Re: Please add 2dce224f469f ("netns: protect netns ID lookups with RCU") to LTS

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Date:   Thu, 9 Sep 2021 15:30:39 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Haakon Bugge <haakon.bugge@...cle.com>
Cc:     Sasha Levin <sashal@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Linux-Net <netdev@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>,
        Doug Ledford <dledford@...hat.com>,
        Jason Gunthorpe <jgg@...dia.com>,
        OFED mailing list <linux-rdma@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Guillaume Nault <gnault@...hat.com>
Subject: Re: Please add 2dce224f469f ("netns: protect netns ID lookups with
 RCU") to LTS

On Thu, Sep 09, 2021 at 01:10:05PM +0000, Haakon Bugge wrote:
> Hi Greg & Sasha,
> 
> 
> tl;dr: Please add 2dce224f469f ("netns: protect netns ID lookups with
> RCU") to the stable releases from v5.4 and older. It fixes a
> spin_unlock_bh() in peernet2id() called with IRQs off. I think this
> neat side-effect of commit 2dce224f469f was quite un-intentional,
> hence no Fixes: tag or CC: stable.

Please provide a working backport for all of the relevant kernel
verisons, as it does not apply cleanly on it's own.

thanks,

greg k-h