Configuration Information [Automatically generated, do not change]:
Machine: i486
OS: linux-gnu
Compiler: gcc
Compilation CFLAGS: -DPROGRAM='bash' -DCONF_HOSTTYPE='i486'
-DCONF_OSTYPE='linux-gnu' -DCONF_MACHTYPE='i486-pc-linux-gnu'
-DCONF_VENDOR='pc' -DLOCALEDIR='/usr/share/locale' -DPACKAGE='bash' -DSHELL
-DHAVE_CONFIG_H -I. -I../bash -I../bash/include -I../bash/lib -g -O2 -Wall
uname output: Linux hestia 2.6.32-5-686 #1 SMP Mon Jun 13 04:13:06 UTC 2011
i686 GNU/Linux
Machine Type: i486-pc-linux-gnu
Bash Version: 4.1
Patch Level: 5
Release Status: release
Description:
Under a convoluted sequence of events, bash blocks unexpectedly.
Following is the minimum amount of code that can replicate the problem.
See comments in code.
Repeat-By:
#!/bin/bash
### demonstrate bug in bash(1):
#
# Problem replicated on:
# * Ubuntu 7.04 (Feisty) Linux 2.6.20-15 IBM ThinkPad P-III 1.1GHz
# GNU bash, version 3.2.13(1)-release (i486-pc-linux-gnu)
#
# * Debian 6.0 (Squeeze) Linux 2.6.32-5-686 Dell P-II 400MHz
# GNU bash, version 4.1.5(1)-release (i486-pc-linux-gnu)
while :; do # problem only occurs in a loop.
eval 'command exec >/dev/null' # both eval and command stms
needed.
# # Target file choice matters
not.
exec >/bad || exit # script locks up at this exec
# # but only if followed by ||.
echo >&2 finished; break # this line never reached.
# # Problem does manifest
without it.
done
Fix:
I haven't tried fixing this.
Also, I haven't tested on the latest version of bash.
