linux-kernel - Re: OOM killer invoked during btrfs send/recieve on otherwise idle machine

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Date:	Tue, 2 Aug 2016 09:48:01 -0600
From:	Chris Murphy <lists@...orremedies.com>
To:	Michal Hocko <mhocko@...nel.org>, Mel Gorman <mgorman@...e.de>
Cc:	Btrfs BTRFS <linux-btrfs@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: OOM killer invoked during btrfs send/recieve on otherwise idle machine

On Tue, Aug 2, 2016 at 9:38 AM, Chris Murphy <lists@...orremedies.com> wrote:
> Yesterday I saw oom killer knocking off processes during a simple cp
> -a from one Btrfs to another, in a VM, with kernel
> 4.8.0-0.rc0.git3.1.fc25.x86_64. The call trace looks different than
> Markus' so I'm not sure it's the same problem. It's not always
> reproducible. It hasn't happened on 4.7.0 though. According ot koji
> this is Linux v4.7-6438-gc624c86
>
> This is 'journalctl -o short-monotonic -b-4 -k'
>
> https://drive.google.com/open?id=0B_2Asp8DGjJ9ZC1JSDJnaWpnSEE

Btrfs volume 2 is created at [  625.769736]  and mounted at [
640.119150], with the copy starting shortly after that. OOM happens at
[  856.212658] . There are a bunch of earlier bug messages, BUG:
sleeping function called from invalid context at mm/slab.h:393.


-- 
Chris Murphy