linux-kernel - Re: 4.9.0 regression in pipe-backed iov

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Message-ID: <20170112225846.GC1555@ZenIV.linux.org.uk>
Date:   Thu, 12 Jan 2017 22:58:46 +0000
From:   Al Viro <viro@...IV.linux.org.uk>
To:     "Alan J. Wylie" <alan@...ie.me.uk>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Thorsten Leemhuis <regressions@...mhuis.info>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: 4.9.0 regression in pipe-backed iov_iter with systemd-nspawn

On Thu, Jan 12, 2017 at 10:46:06PM +0000, Alan J. Wylie wrote:
> at 14:26 on Thu 12-Jan-2017 Linus Torvalds (torvalds@...ux-foundation.org) wrote:

> 13761 copy_file_range(5, NULL, 1, NULL, 9223372036854775807, 0) = -1 EXDEV (Invalid cross-device link)
> 13761 sendfile(1, 5, NULL, 9223372036854775807) = -1 EINVAL (Invalid argument)
> 13761 splice(5, NULL, 1, NULL, 9223372036854775807, 0) = -1 EAGAIN (Resource temporarily unavailable)

*bleep*

splice from /dev/ptmx to stdout, whatever the latter had been.  IOW,
we are dealing with do_splice() -> do_splice_to() -> default_file_splice_read()
for pseudo-tty as source...