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

From "Alan J. Wylie" <alan@wylie.me.uk>
Newsgroups linux.kernel
Subject Re: 4.9.0 regression in pipe-backed iov_iter with systemd-nspawn
Date 2017-01-13 08:40 +0100
Message-ID <sZ4CS-6u0-3@gated-at.bofh.it> (permalink)
References <sYUk9-8sU-5@gated-at.bofh.it> <sYW2B-15S-5@gated-at.bofh.it> <sYWlZ-1cO-31@gated-at.bofh.it> <sYWYF-1Hr-5@gated-at.bofh.it> <sZ1lD-4Bb-1@gated-at.bofh.it>
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at 04:00 on Fri 13-Jan-2017 Al Viro (viro@ZenIV.linux.org.uk) wrote:

> That, and check if it is reproducible on commit 523ac9afc73a with
> commit 8e54cadab447 cherry-picked on top of that.

$ git checkout 523ac9afc73a

$ git cherry-pick 8e54cadab447
[detached HEAD 3826f27f6830] fix default_file_splice_read()
 Author: Al Viro <viro@zeniv.linux.org.uk>
 Date: Sat Nov 26 20:05:42 2016 -0500
 1 file changed, 2 insertions(+), 1 deletion(-)

$ uname -a
Linux frodo 4.8.0-rc8-00011-g3826f27f6830 #1 SMP PREEMPT Fri Jan 13 07:30:06 GMT 2017 x86_64 AMD FX(tm)-8350 Eight-Core Processor AuthenticAMD GNU/Linux

# ps axfu | grep -A10 cron
root       982  0.0  0.0  18764  1948 ?        Ss   07:32   0:00 /usr/sbin/cron
root      1593  0.0  0.0  27340  2164 ?        S    07:35   0:00  \_ /usr/sbin/cron
root      1594  0.0  0.0   9840  2572 ?        Ss   07:35   0:00      \_ /bin/bash -c date; /work/chroot-shared/test.sh; date
root      1597  0.0  0.0   9840  2668 ?        S    07:35   0:00      |   \_ /bin/bash /work/chroot-shared/test.sh
root      1596  0.0  0.0  76156  5496 ?        S    07:35   0:00      \_ /usr/sbin/sendmail -FCronDaemon -odi -oem -oi -t
root      1600  0.0  0.0  76140  5440 ?        S    07:35   0:00          \_ /usr/sbin/postdrop -r

Still hangs

-- 
Alan J. Wylie                                          http://www.wylie.me.uk/

Dance like no-one's watching. / Encrypt like everyone is.
Security is inversely proportional to convenience

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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

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