Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1557865

Re: 4.9.0 regression in pipe-backed iov_iter with systemd-nspawn

From Linus Torvalds <torvalds@linux-foundation.org>
Newsgroups linux.kernel
Subject Re: 4.9.0 regression in pipe-backed iov_iter with systemd-nspawn
Date 2017-01-12 23:30 +0100
Message-ID <sYW2B-15S-5@gated-at.bofh.it> (permalink)
References <sYUk9-8sU-5@gated-at.bofh.it>
Organization linux.* mail to news gateway

Show all headers | View raw

On Thu, Jan 12, 2017 at 12:26 PM, Alan J. Wylie <alan@wylie.me.uk> wrote:
>
> Strace shows that the processes are hanging in write() and read() calls.

If this is splice-related, I'm assuming that they aren't actually the
two ends of the same pipe, and there is somebody doing splice in the
middle.

I'm not seeing that process. I'm assuming it's systemd.  Can you try
to find it and strace that one too? Because that middle man is likely
the one that has problems (and is not able to splice from one pipe to
the other).

Ugh. That one commit has had a lot of bugs in it already. We do not
have good splice test coverage, because almost nobody uses it.

               Linus

Back to linux.kernel | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

4.9.0 regression in pipe-backed iov_iter with systemd-nspawn "Alan J. Wylie" <alan@wylie.me.uk> - 2017-01-12 21:40 +0100
  Re: 4.9.0 regression in pipe-backed iov_iter with systemd-nspawn Linus Torvalds <torvalds@linux-foundation.org> - 2017-01-12 23:30 +0100
    Re: 4.9.0 regression in pipe-backed iov_iter with systemd-nspawn Al Viro <viro@ZenIV.linux.org.uk> - 2017-01-12 23:40 +0100
      Re: 4.9.0 regression in pipe-backed iov_iter with systemd-nspawn Al Viro <viro@ZenIV.linux.org.uk> - 2017-01-12 23:50 +0100
        Re: 4.9.0 regression in pipe-backed iov_iter with systemd-nspawn Linus Torvalds <torvalds@linux-foundation.org> - 2017-01-13 00:10 +0100
          Re: 4.9.0 regression in pipe-backed iov_iter with systemd-nspawn Linus Torvalds <torvalds@linux-foundation.org> - 2017-01-13 00:20 +0100
            Re: 4.9.0 regression in pipe-backed iov_iter with systemd-nspawn Al Viro <viro@ZenIV.linux.org.uk> - 2017-01-13 00:30 +0100
          Re: 4.9.0 regression in pipe-backed iov_iter with systemd-nspawn Al Viro <viro@ZenIV.linux.org.uk> - 2017-01-13 00:20 +0100
    Re: 4.9.0 regression in pipe-backed iov_iter with systemd-nspawn "Alan J. Wylie" <alan@wylie.me.uk> - 2017-01-12 23:50 +0100
      Re: 4.9.0 regression in pipe-backed iov_iter with systemd-nspawn Al Viro <viro@ZenIV.linux.org.uk> - 2017-01-13 00:00 +0100
      Re: 4.9.0 regression in pipe-backed iov_iter with systemd-nspawn Linus Torvalds <torvalds@linux-foundation.org> - 2017-01-13 00:30 +0100
        Re: 4.9.0 regression in pipe-backed iov_iter with systemd-nspawn Al Viro <viro@ZenIV.linux.org.uk> - 2017-01-13 05:10 +0100
          Re: 4.9.0 regression in pipe-backed iov_iter with systemd-nspawn "Alan J. Wylie" <alan@wylie.me.uk> - 2017-01-13 08:40 +0100
        Re: 4.9.0 regression in pipe-backed iov_iter with systemd-nspawn "Alan J. Wylie" <alan@wylie.me.uk> - 2017-01-13 08:40 +0100
          Re: 4.9.0 regression in pipe-backed iov_iter with systemd-nspawn Al Viro <viro@ZenIV.linux.org.uk> - 2017-01-13 10:40 +0100
            Re: 4.9.0 regression in pipe-backed iov_iter with systemd-nspawn "Alan J. Wylie" <alan@wylie.me.uk> - 2017-01-13 11:00 +0100
              Re: 4.9.0 regression in pipe-backed iov_iter with systemd-nspawn Al Viro <viro@ZenIV.linux.org.uk> - 2017-01-13 11:30 +0100
                Re: 4.9.0 regression in pipe-backed iov_iter with systemd-nspawn "Alan J. Wylie" <alan@wylie.me.uk> - 2017-01-13 11:40 +0100
                Re: 4.9.0 regression in pipe-backed iov_iter with systemd-nspawn Al Viro <viro@ZenIV.linux.org.uk> - 2017-01-13 12:30 +0100
                Re: 4.9.0 regression in pipe-backed iov_iter with systemd-nspawn Al Viro <viro@ZenIV.linux.org.uk> - 2017-01-13 12:20 +0100
                Re: 4.9.0 regression in pipe-backed iov_iter with systemd-nspawn Linus Torvalds <torvalds@linux-foundation.org> - 2017-01-13 20:40 +0100
                Re: 4.9.0 regression in pipe-backed iov_iter with systemd-nspawn Al Viro <viro@ZenIV.linux.org.uk> - 2017-01-13 21:10 +0100
                Re: 4.9.0 regression in pipe-backed iov_iter with systemd-nspawn Al Viro <viro@ZenIV.linux.org.uk> - 2017-01-13 21:20 +0100
                Re: 4.9.0 regression in pipe-backed iov_iter with systemd-nspawn Linus Torvalds <torvalds@linux-foundation.org> - 2017-01-13 21:40 +0100
                Re: 4.9.0 regression in pipe-backed iov_iter with systemd-nspawn Al Viro <viro@ZenIV.linux.org.uk> - 2017-01-13 21:50 +0100
                Re: 4.9.0 regression in pipe-backed iov_iter with systemd-nspawn Al Viro <viro@ZenIV.linux.org.uk> - 2017-01-13 23:00 +0100
                Re: 4.9.0 regression in pipe-backed iov_iter with systemd-nspawn Al Viro <viro@ZenIV.linux.org.uk> - 2017-01-13 23:00 +0100
                Re: 4.9.0 regression in pipe-backed iov_iter with systemd-nspawn Al Viro <viro@ZenIV.linux.org.uk> - 2017-01-13 23:20 +0100
                Re: 4.9.0 regression in pipe-backed iov_iter with systemd-nspawn Al Viro <viro@ZenIV.linux.org.uk> - 2017-01-14 00:00 +0100
                Re: 4.9.0 regression in pipe-backed iov_iter with systemd-nspawn Linus Torvalds <torvalds@linux-foundation.org> - 2017-01-14 02:10 +0100
                Re: 4.9.0 regression in pipe-backed iov_iter with systemd-nspawn Al Viro <viro@ZenIV.linux.org.uk> - 2017-01-14 02:30 +0100
                Re: 4.9.0 regression in pipe-backed iov_iter with systemd-nspawn Al Viro <viro@ZenIV.linux.org.uk> - 2017-01-14 02:50 +0100
                Re: 4.9.0 regression in pipe-backed iov_iter with systemd-nspawn Linus Torvalds <torvalds@linux-foundation.org> - 2017-01-14 02:50 +0100
                Re: 4.9.0 regression in pipe-backed iov_iter with systemd-nspawn Al Viro <viro@ZenIV.linux.org.uk> - 2017-01-14 03:00 +0100
                Re: 4.9.0 regression in pipe-backed iov_iter with systemd-nspawn Al Viro <viro@ZenIV.linux.org.uk> - 2017-01-15 02:00 +0100
                Re: 4.9.0 regression in pipe-backed iov_iter with systemd-nspawn "Alan J. Wylie" <alan@wylie.me.uk> - 2017-01-14 14:30 +0100
                Re: 4.9.0 regression in pipe-backed iov_iter with systemd-nspawn "Alan J. Wylie" <alan@wylie.me.uk> - 2017-01-14 17:40 +0100
                Re: 4.9.0 regression in pipe-backed iov_iter with systemd-nspawn Linus Torvalds <torvalds@linux-foundation.org> - 2017-01-14 19:10 +0100
                Re: 4.9.0 regression in pipe-backed iov_iter with systemd-nspawn Linus Torvalds <torvalds@linux-foundation.org> - 2017-01-13 21:10 +0100
                Re: 4.9.0 regression in pipe-backed iov_iter with systemd-nspawn Al Viro <viro@ZenIV.linux.org.uk> - 2017-01-13 21:20 +0100

csiph-web