Configuration Information [Automatically generated, do not change]:
Machine: x86_64
OS: linux-gnu
Compiler: gcc -I/home/abuild/rpmbuild/BUILD/bash-4.3
-L/home/abuild/rpmbuild/BUILD/bash-4.3/../readline-6.3
Compilation CFLAGS: -DPROGRAM='bash' -DCONF_HOSTTYPE='x86_64'
-DCONF_OSTYPE='linux-gnu' -DCONF_MACHTYPE='x86_64-suse-linux-gnu'
-DCONF_VENDOR='suse' -DLOCALEDIR='/usr/share/locale' -DPACKAGE='bash' -DSHELL
-DHAVE_CONFIG_H -I. -I. -I./include -I./lib -fmessage-length=0
-grecord-gcc-switches -O2 -Wall -D_FORTIFY_SOURCE=2 -fstack-protector
-funwind-tables -fasynchronous-unwind-tables -g -D_GNU_SOURCE -DRECYCLES_PIDS
-Wall -g -Wuninitialized -Wextra -Wno-unprototyped-calls -Wno-switch-enum
-Wno-unused-variable -Wno-unused-parameter -Wno-parentheses -ftree-loop-linear
-pipe -DBNC382214=0 -DMUST_UNBLOCK_CHLD=1 -DIMPORT_FUNCTIONS_DEF=0 -fprofile-use
uname output: Linux d136 3.15.0-rc7-3-desktop #1 SMP PREEMPT Wed May 28
15:39:51 UTC 2014 (96f5b60) x86_64 x86_64 x86_64 GNU/Linux
Machine Type: x86_64-suse-linux-gnu
Bash Version: 4.3
Patch Level: 33
Release Status: release
Description:
Named fifo's causing hanging bash scripts like
while IFS="|" read a b c ; do
[shell code]
done < <(shell code)
can cause random hangs of the bash. An strace shows that the bash
stays in wait4()
Repeat-By:
Here is a script which had been modified to do no real work but show
the problem:
#!/bin/bash
# Task: go through the files in $RPM_BUILD_ROOT and
# relink symbolic links so that:
# links crossing top level directory boundaries (/usr/* -> /etc/*)
# are absolute links
# links below one top level directory (/usr/bin/* -> /usr/lib/*)
# are relative links
# NOTE: we're not doing this to fix a problem (as no matter how you
# do it you fix one problem by creating another). We're doing it
# so we can document this as policy - so you can rely on it
# Additional Task: check some usual errors arround symlinks e.g.
# dangling symlinks or symlinks to init scripts in wrong location
# Author: Stephan Kulow <co...@suse.de>
#
# major speedup: Tomas Cech <sleep_wal...@suse.cz> and Michal Kubecek
<mkube...@suse.cz>
# If using normal root, avoid changing anything.
###if [ -z "$RPM_BUILD_ROOT" ]; then
### exit 0
###fi
RPM_BUILD_ROOT=/
strip_slashes() {
local loc="${!1}"
local tmp="${loc//\/\///}"
while [ "$loc" != "$tmp" ]; do
loc="$tmp"
tmp="${loc//\/\///}"
done
eval "$1"="'$loc'"
}
eat_component() {
loc="${!1}"
local rslt="${loc#/*/}"
if [ "$rslt" != "$loc" ]; then
rslt="/$rslt"
else
rslt="${loc##/*}"
fi
eval "$1"="'$rslt'"
}
top_dir () {
local rslt
if [ "${1:0:1}" = / ]; then
rslt="${1:1}"
rslt="/${rslt%%/*}"
else
rslt="$1"
fi
eval "$2"="'$rslt'"
}
LC_ALL=
LANG=
LC_TIME=POSIX
basename_int() {
echo "${1##*/}"
}
dirname_int() {
local rslt="${1%/*}"
if [ -n "$rslt" ]; then
echo "$rslt"
elif [ "${1:0:1}" = / ]; then
echo /
else
echo .
fi
}
cd $RPM_BUILD_ROOT
had_errors=0
while IFS="|" read link link_dir link_dest
do
link="${link#.}"
link_dir="${link_dir#.}"
orig_link_dest="$link_dest"
new_link_dest=NONE
link_dir="$(dirname_int $link)"
case $link_dest in
.|..|../..) # link to current dir
continue ;;
.*) # relative links up
link_dest="$link_dir/$link_dest"
;;
/*) # absolute links
;;
*/*) # relative links down
link_dest="$link_dir/$link_dest"
;;
*) # the rest
continue
esac
# cleaning out double slash
strip_slashes link_dest
link_dest="${link_dest%.}"
link_dest="${link_dest%/}"
# eliminating /./ components
link_dest="${link_dest//\/.\///}"
counter=0
# eliminating back references
while [[ $link_dest =~ /\.\. ]]; do
link_dest="$(sed "s@/[^/]\+/\.\.@@" <<< "$link_dest")"
case $link_dest in
/..*) # this is very mean
echo "ERROR: $link points to illegal $link_dest"
exit 1
;;
esac
counter=$((counter + 1))
if test $counter -gt 10; then
echo "ERROR: more than 10 back references in $link?"
exit 1
fi
done
if test "$link" = "$link_dest"; then
echo "ERROR: $link points to itself (as $orig_link_dest)"
exit 1
fi
# black list
case "$link,$link_dest" in
*,/var/lib/named*)
continue;;
/usr/etc,*|/usr/tmp,*)
continue;;
*/share/texmf/*|/usr/share/terminfo/*)
continue;;
/sbin/init,*) # don't create absolute symlink for /sbin/init
continue;;
*,/etc/alternatives/*) # white list alternatives
;;
*share/automake-*)
echo "ERROR: link target $link points into automake directory"
echo " You might want to add a -c to the automake call (or just"
echo " skip the files from packaging)"
exit 1
;;
*,/opt/kde3/share/doc*/HTML/*/common) # white listed for not existant
;;
*,/usr/share/doc/kde/HTML/*/common) # white listed for not existant
;;
*,/proc/*) # links pointing into /proc file system
;;
*)
if test ! -L ./$link_dest && test ! -e $link_dest && test ! -e
./$link_dest; then
echo "ERROR: link target doesn't exist (neither in build root nor
in installed system):"
echo " $link -> $link_dest"
echo "Add the package providing the target to neededforbuild and
Requires"
test "$NO_BRP_STALE_LINK_ERROR" != "yes" && had_errors=1
fi
;;
esac
forced_absolute=0
for prefix in /usr/X11R6/lib/X11 /usr/X11R6/include/X11
/usr/X11R6/lib/X11/app-defaults ; do
if [[ $link =~ ^$prefix/ ]]; then
if ! [[ $link_dest =~ ^$prefix/ ]]; then
# not ok
forced_absolute=1
fi
fi
done
dest_dir="$(dirname_int $link_dest)"
# figuring out (currently) correct destination
if [ "$link_dir" = "$dest_dir" -o "$dest_dir" = "." ]; then
new_link_dest="$(basename_int $link_dest)"
else
# figuring out top level directory
top_dir "$link" top_link
top_dir "$link_dest" top_dest
if [ "$forced_absolute" = 0 -a "$top_link" = "$top_dest" ]; then #
supposed to be relative
# first we need to cut out the common prefix
link_tmp=$link
while [ "$top_link" = "$top_dest" ]; do
link_orig=$link_tmp
dest_orig=$link_dest
link_tmp="/${link_tmp#/*/}"
link_dest="/${link_dest#/*/}"
top_link="${link_tmp#/}"
top_link="/${top_link%%/*}"
top_dest="${link_dest#/}"
top_dest="/${top_dest%%/*}"
if [ "$top_dest" = "$dest_orig" -o "$top_link" = "$link_orig"
]; then
link_tmp="$link_orig"
link_dest="$dest_orig"
break
fi
done
# now we add a .. for every directory component
link_tmp="$(dirname_int $link_tmp)"
if [ "$link_tmp" = "$link_dest" ]; then
new_link_dest=.
elif [ "$link_tmp" != "/" ]; then # we have a directory component
link_rel=
while [ -n "$link_tmp" ]; do
eat_component link_tmp
link_rel="../$link_rel"
done
new_link_dest="$link_rel/$link_dest"
strip_slashes new_link_dest
else
# get rid of the slash
link_dest="${link_dest#/}"
new_link_dest="$link_dest"
fi
else
new_link_dest="$link_dest"
fi
fi
if [ "$new_link_dest" != NONE -a "$new_link_dest" != "$orig_link_dest" ];
then
echo "INFO: relinking $link -> $new_link_dest (was $orig_link_dest)"
### rm ./$link && ln -s $new_link_dest ./$link
fi
done < <(find . -type l -printf '%p|%h|%l\n' 2>/dev/null)
if test "$had_errors" = 1; then
exit 1
fi
