On Wed, Jun 10, 2015 at 11:00:51AM -0400, Chet Ramey wrote:
> On 6/2/15 1:07 PM, Roy Keene wrote:
> > All,
> >
> > There is a bug of some sort in bash 4.3.30 (and likely others) when
> > compiled with --disable-job-control on Linux/x86_64.
>
> I can't reproduce this on RHEL 6 or Fedora 22 with bash-4.3.39.
I can reliably reproduce this in 4.3.30 and in branch `master' of the latest
git:
# Bash from `master'
dualbus@hp ...src/gnu/bash % time ./bash -ic 'until : | { ! :; }; do :; done;
echo x'
x
./bash -ic 'until : | { ! :; }; do :; done; echo x' 2.08s user 3.72s system
48% cpu 12.011 total
dualbus@hp ...src/gnu/bash % ./bash --version
GNU bash, version 4.3.39(1)-release (x86_64-unknown-linux-gnu)
Copyright (C) 2013 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software; you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
# Bash from FTP
dualbus@hp ~/Downloads/bash-4.3.30
% time ./bash -c 'until : | { ! :; }; do :; done; echo x'
^C./bash -c 'until : | { ! :; }; do :; done; echo x' 3.10s user 18.81s
system 41% cpu 52.893 total
dualbus@hp ~/Downloads/bash-4.3.30
% time ./bash -ic 'until : | { ! :; }; do :; done; echo x'
x
./bash -ic 'until : | { ! :; }; do :; done; echo x' 1.97s user 3.53s system
52% cpu 10.427 total
dualbus@hp ~/Downloads/bash-4.3.30
% ./bash --version
GNU bash, version 4.3.30(1)-release (x86_64-unknown-linux-gnu)
Copyright (C) 2013 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software; you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
I compiled both with:
CFLAGS='-O0 -g' ./configure --disable-job-control
Notice that it doesn't happen if you don't use the interactive mode.
All this is on GNU/Linux (debian sid):
dualbus@hp ~ % uname -a
Linux hp 3.14-2-amd64 #1 SMP Debian 3.14.15-2 (2014-08-09) x86_64 GNU/Linux
I can reproduce it on OpenBSD:
$ ./bash --version
GNU bash, version 4.3.30(1)-release (x86_64-unknown-openbsd5.6)
Copyright (C) 2013 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software; you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
$ time ./bash -ic 'until : | { ! :; }; do :; done; echo x'
x
0m0.39s real 0m0.06s user 0m0.28s system
$ time ./bash -c 'until : | { ! :; }; do :; done; echo x'
^C^C^C^C 0m11.27s real 0m2.25s user 0m6.87s system
$ uname -a
OpenBSD openbsd.my.domain 5.6 GENERIC#310 amd64
And NetBSD:
[dual...@faeroes.sdf.org]$ ./bash --version
GNU bash, version 4.3.30(1)-release (x86_64-unknown-netbsd6.1.)
Copyright (C) 2013 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software; you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
[dual...@faeroes.sdf.org]$ time ./bash -ic 'until : | { ! :; }; do :; done;
echo x'
x
real 0m27,27s
user 0m9,72s
sys 0m12,24s
[dual...@faeroes.sdf.org]$ uname -a
NetBSD faeroes 6.1_STABLE NetBSD 6.1_STABLE (SDF6.amd64) #0: Sun Dec 21
18:11:22 UTC 2014
root@bjork:/spare/netbsd/usr/src/sys/arch/amd64/compile/SDF6.amd64 amd64
I tried digging into the issue with strace/ltrace, but I couldn't find any
pattern.
--
Eduardo Bustamante
https://dualbus.me/
