2013-07-18 12:32:10 +0100, Peter Stephenson:
[...]
> Apparently working (except for the fact it doesn't fix Stephane's
> original problem, don't know if we're any further forward with that).
> However, I'll wait in case Bart can see something I missed.
> 
> diff --git a/Src/jobs.c b/Src/jobs.c
[...]

Not better with that one (on top of the other one).

~$ eval 'ls -l <(echo 1) <(echo 2) <(echo 3) <(echo 4)' | cat
ls: cannot access /proc/self/fd/11: No such file or directory
ls: cannot access /proc/self/fd/13: No such file or directory
lr-x------ 1 chazelas chazelas 64 Jul 19 20:52 /proc/self/fd/10 -> pipe:[509333]
lr-x------ 1 chazelas chazelas 64 Jul 19 20:52 /proc/self/fd/12 -> pipe:[509335]

Though I've also seen (with one zsh invocation consistently but no other one):

~$ eval 'ls -l <(echo 1) <(echo 2) <(echo 3) <(echo 4)' | cat
ls: cannot access /proc/self/fd/11: No such file or directory
ls: cannot access /proc/self/fd/12: No such file or directory
ls: cannot access /proc/self/fd/13: No such file or directory
lr-x------ 1 chazelas chazelas 64 Jul 19 20:51 /proc/self/fd/10 -> pipe:[504591]

Attached is the strace output (for the first case).

See how fd 13 is closed in the process that execs ls and fd 11
in its parent shortly before the fork.

I verified that I can reproduce it from a fresh debootstrap of
debian sid amd64, so it should be easily reproduced from a
Debian-based system like ubuntu or ubuntu live CD.

Procedure:

sudo debootstrap --arch amd64 sid debian http://ftp.uk.debian.org/debian
cd debian
sudo mount --bind /dev dev
sudo mount -t proc p proc
sudo mount -t sysfs s sys
sudo mount -t devpts d dev/pts
chroot . bash
apt-get install zsh
zsh
autoload compinit
compinit
eval 'ls -l <(echo 1) <(echo 2) <(echo 3) <(echo 4)' | cat

From the config.status of the debian package build:

ac_cs_config="'--build=x86_64-linux-gnu' '--includedir=\${prefix}/include' '--mandir=\${prefix}/share/man' '--infodir=\${prefix}/share/info' '--sysconfdir=/etc' '--localstatedir=/var' '--libdir=\${prefix}/lib/x86_64-linux-gnu' '--libexecdir=\${prefix}/lib/x86_64-linux-gnu' '--disable-maintainer-mode' '--disable-dependency-tracking' '--prefix=/usr' '--mandir=/usr/share/man' '--bindir=/bin' 'LDFLAGS=-Wl,--as-needed -g -Wl,-z,relro' '--infodir=/usr/share/info' '--enable-maildir-support' '--enable-max-jobtable-size=256' '--enable-etcdir=/etc/zsh' '--enable-function-subdirs' '--enable-site-fndir=/usr/local/share/zsh/site-functions' '--enable-fndir=/usr/share/zsh/functions' '--with-tcsetpgrp' '--with-term-lib=ncursesw tinfo' '--enable-cap' '--enable-pcre' '--enable-readnullcmd=pager' '--enable-custom-patchlevel=Debian' '--enable-additional-fpath=/usr/share/zsh/vendor-functions,/usr/share/zsh/vendor-completions' 'build_alias=x86_64-linux-gnu' 'CFLAGS=-g -O2 -fstack-protector --param=ssp-buffer-size=4 -Wformat -Werror=format-security -Wall -g' 'CPPFLAGS=-D_FORTIFY_SOURCE=2'"

-- 
Stephane