linux-kernel - Re: [PATCH stable-4.9 2/2] mm, vmscan: consider eligible zones in get_scan

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Message-ID: <20170307141417.GK28642@dhcp22.suse.cz>
Date:   Tue, 7 Mar 2017 15:14:17 +0100
From:   Michal Hocko <mhocko@...nel.org>
To:     MegaBrutal <megabrutal@...il.com>
Cc:     Stable tree <stable@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>, linux-mm@...ck.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Hillf Danton <hillf.zj@...baba-inc.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Mel Gorman <mgorman@...e.de>, Minchan Kim <minchan@...nel.org>,
        Trevor Cordes <trevor@...nopolis.ca>
Subject: Re: [PATCH stable-4.9 2/2] mm, vmscan: consider eligible zones in
 get_scan_count

On Mon 06-03-17 19:00:00, MegaBrutal wrote:
> Hi Michal,
> 
> I'm over a very long kernel bisection, and if I made no mistake in
> testing commits, this patch fixes a kernel bug which affects my HP
> Compaq dc5800 machine with 32 bit Ubuntu OS.
> 
> The bug manifests itself with "NMI watchdog: BUG: soft lockup - CPU#0
> stuck for 23s! [kswapd0:38]" messages in 4.8 kernels, and "page
> allocation stalls for 47608ms, order:1,
> mode:0x17000c0(GFP_KERNEL_ACCOUNT|__GFP_NOTRACK)" in 4.10 kernels up
> to this commit.

This is really hard to say without seeing the traces.
 
> Michal, can you confirm that this patch may fix issues like the ones I
> encountered? If so, I'll try to get the Ubuntu kernel staff to
> backport this commit to Yakkety's 4.8 kernel. On the other hand, I
> can't seem to be able to backport this commit to 4.8 with "git
> cherry-pick", so maybe I need to wait for your tweaks you mentioned.

The backport from 4.9 to 4.8 shouldn't be very complicated I believe.
 
> Anyway, thank you very much for the fix!

Good to hear the patch helped you though.
-- 
Michal Hocko
SUSE Labs