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

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Message-ID: <22648.33766.920805.378037@wylie.me.uk>
Date:   Fri, 13 Jan 2017 07:38:14 +0000
From:   "Alan J. Wylie" <alan@...ie.me.uk>
To:     Al Viro <viro@...IV.linux.org.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

at 04:00 on Fri 13-Jan-2017 Al Viro (viro@...IV.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@...iv.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