linux-kernel - Re: mlockall(MCL_CURRENT) blocking infinitely

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Message-ID: <9621c697a6af55422f8c89087e73dc1ba2098154.camel@gmx.de>
Date:   Wed, 20 Nov 2019 13:42:30 +0100
From:   Robert Stupp <snazy@....de>
To:     Jan Kara <jack@...e.cz>, Josef Bacik <josef@...icpanda.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        Michal Hocko <mhocko@...nel.org>
Cc:     "Kirill A. Shutemov" <kirill@...temov.name>,
        Randy Dunlap <rdunlap@...radead.org>,
        linux-kernel@...r.kernel.org, Linux MM <linux-mm@...ck.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "Potyra, Stefan" <Stefan.Potyra@...ktrobit.com>
Subject: Re: mlockall(MCL_CURRENT) blocking infinitely

Is there any chance to get a patch merged?

On Thu, 2019-11-07 at 09:08 +0100, Robert Stupp wrote:
> On Wed, 2019-11-06 at 18:25 +0100, Jan Kara wrote:
> > On Wed 06-11-19 18:03:10, Robert Stupp wrote:
> > > Oh, and I just realized, that I have two custom settings in my
> > > /etc/rc.local - guess, I configured that when I installed that
> > > machine
> > > years ago. Sorry, that I haven't mentioned that earlier.
> > >
> > > echo 0 > /sys/block/nvme0n1/queue/read_ahead_kb
> > > echo never >
> > > /sys/kernel/mm/transparent_hugepage/defrag
> > >
> > > That setting is probably not quite standard, but I assume there
> > > are
> > > some database server setups out there, that set RA=0 as well.
> >
> > Ok, yes, that explains ra_pages == 0. Thanks for the details.
>
> Ah! And with these settings, a fresh & clean installation of Ubuntu
> eoan (5.3.x kernel), hangs during reboot.
> And if the VM's booted with these settings in /etc/rc.local, the
> mlockall(MCL_CURRENT) is reproducible as well.
>
>