linux-kernel - Re: [BUG] page allocation failure reading procfs ipv6 configuration files with cgroups

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Message-ID: <CAMdYzYojq--qWhxmpj4VL_feNjMFZcjN6q7mQL-+SWujScNzkQ@mail.gmail.com>
Date:   Mon, 22 Feb 2021 18:40:15 -0500
From:   Peter Geis <pgwipeout@...il.com>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     Tejun Heo <tj@...nel.org>, Zefan Li <lizefan.x@...edance.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Alexey Dobriyan <adobriyan@...il.com>,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        cgroups@...r.kernel.org
Subject: Re: [BUG] page allocation failure reading procfs ipv6 configuration
 files with cgroups

On Sat, Feb 20, 2021 at 12:36 PM Matthew Wilcox <willy@...radead.org> wrote:
>
> On Sat, Feb 20, 2021 at 12:29:18PM -0500, Peter Geis wrote:
> > Good Afternoon,
> >
> > I have been tracking down a regular bug that triggers when running OpenWRT in a lxd container.
> > Every ten minutes I was greeted with the following splat in the kernel log:
> >
> > [2122311.383389] warn_alloc: 3 callbacks suppressed
> > [2122311.383403] cat: page allocation failure: order:5, mode:0x40dc0(GFP_KERNEL|__GFP_COMP|__GFP_ZERO), nodemask=(null),cpuset=lxc.payload.openwrt,mems_allowed=0
>
> You want this patch:
>
> https://lore.kernel.org/linux-fsdevel/6345270a2c1160b89dd5e6715461f388176899d1.1612972413.git.josef@toxicpanda.com/

I've tested this patch against 5.10.17 for 36 hours and can confirm it
solves the problem.
Thank you.