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Date:   Wed, 1 Aug 2018 16:19:37 +0100
From:   Al Viro <viro@ZenIV.linux.org.uk>
To:     Kirill Tkhai <ktkhai@virtuozzo.com>
Cc:     "linux-fsdevel@vger.kernel.org" <linux-fsdevel@vger.kernel.org>,
        LKML <linux-kernel@vger.kernel.org>
Subject: Re: Commit "new primitive: discard_new_inode()" introduces a problem
Message-ID: <20180801151937.GN30522@ZenIV.linux.org.uk>
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On Wed, Aug 01, 2018 at 05:43:35PM +0300, Kirill Tkhai wrote:
> Hi, Al,
> 
> commit 22dc9a1682722fda8603991595528b87e90436f6
> Author: Al Viro <viro@zeniv.linux.org.uk>
> Date:   Thu Jun 28 15:53:17 2018 -0400
> 
>     new primitive: discard_new_inode()
> 
> from current linux-next introduces the following problem.
> It reproduces 100% in my test VM:
> 
> # cat /etc/mtab 
> /dev/sda1 / ext4 rw 0 0
> proc /proc proc rw 0 0
> sysfs /sys sysfs rw 0 0
> devpts /dev/pts devpts rw,gid=5,mode=620 0 0
> tmpfs /dev/shm tmpfs rw,noexec,nosuid,nodev 0 0
> # echo 3 > /proc/sys/vm/drop_caches 
> # cat /etc/mtab 
> cat: /etc/mtab: Cannot allocate memory

Can't reproduce here...  Could you post your .config (and
toolchain information, for the sake of completeness)?