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Date: Thu, 12 Jan 2017 20:31:19 +0000
From: Al Viro <viro@ZenIV.linux.org.uk>
To: "Alan J. Wylie" <alan@wylie.me.uk>
Cc: Thorsten Leemhuis <regressions@leemhuis.info>,
        linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: 4.9.0 regression in pipe-backed iov_iter with systemd-nspawn
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References: <22647.59020.331664.632444@wylie.me.uk>
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On Thu, Jan 12, 2017 at 08:26:52PM +0000, Alan J. Wylie wrote:
> 
> Some time after 4.9.0 was released, I noticed that a cron job running
> systemd-nspawn was hanging trying to send mail.

Check if 8e54cadab447 (fix default_file_splice_read()) fixes it.