From: [email protected]

Package: bash
Version: 3.0-5
Severity: normal
Tags: sid

Thanks for maintaining bash.

It rocks.

Under certain circumstances, bash crashes after
upgrading the linux kernel from 2.4.19-aa1 to
2.6.7-1-k7. The bug has been duplicated two other
boxes with:

a.) a custom compiled 2.6.7 kernel for AMD's
k7 and

b.) a 2.6.8 rc3 kernel for i486 on Slackware,
version 10.

It has also been duplicated with an earlier
2.? version of bash.

Although I suspect a bug in the kernel's process
handling code, I reported this bug for bash first,
because :

a.) bash is crashing and

b.) I expect the kernel guys will respond
quicker if they know:

i.) bash has been eliminated and ideally,

ii.) their attention is directed to
specific kernel code.

A script that duplicates the bug follows.

Feel free to let me know if you have trouble
duplicating the problem. I'd like to get the
kernel guys involved soon.

Thanks,
Kingsley
================== Begin script ====================
#!/bin/bash

# This script demonstrates how kernel version
# 2.6.7-1-k7 causes bash to crash. Another person
# duplicated the bug with a kernel that he
# compiled and a third person duplicated the bug
# with 2.6.8 rc3 on slackware version 10.
# Although I suspect a bug in the kernel's process
# handling code, I'll report this bug for bash
# first, because it's bash that's crashing and I
# expect the kernel guys will respond quicker if
# they know bash has been eliminated and ideally,
# we can direct them to more specific kernel code.
# The bug didn't happen with 2.4.19-aa1. KGMJR
# 8/15/2004.

####################################################
# Check if required programs are installed ####################################################

for application in xmessage xterm mutt gvim bash grep watch test; do
if ! `which $application > /dev/null` ; then
echo need to install $application
echo It is in $(dpkg -S $application)
exit 1
fi
done


######################################################
# Check if a suspect version of the kernel is
# installed
######################################################
if ! uname -r | grep 2.6 > /dev/null; then
echo This should be run under a 2.6 version of the linux kernel, ideally debian\'s version 2.6.7-1-k7.
fi


####################################################
# Create a mutt initialization file ####################################################
echo "set editor='gvim -f -U /tmp/gvimrc'" > /tmp/muttrc


####################################################
# Create gvimrc file
####################################################
echo 'map <S-F3> :w!:!/tmp/script % &' > /tmp/gvimrc


####################################################
# Create a bash (sub-)script that should abort. ####################################################
cat > /tmp/script <<EOF
#!/bin/bash

echo "Got this far." > /tmp/log

if ! echo "hello world" | grep "x" > /dev/null ; then
echo "Got further(1)." >> /tmp/log
else
echo "Got further(2)." >> /tmp/log
fi

echo "Got to the end." >> /tmp/log
EOF

chmod 755 /tmp/script


####################################################
# Watch how far the script gets. ####################################################
xterm -e watch -n 1 "if test -f /tmp/log ; then cat /tmp/log; fi" &


####################################################
# Instructions for how to duplicate the bug ####################################################

xmessage "You'll need to have an email waiting for
you to read. If you don't already have one, send
an email to yourself now.

Then, in mutt's xterm, press \"r\" and <enter> a
few times to reply to the email.

Once you are editing the reply in gvim, press
shift-F3 and check the \"watch\" xterm to see how
far the script got. Press shift-F3 a few times.
It should duplicate the bug within 10 or so tries,
in which case you'll see fewer than 3 lines in
watch's xterm." &


####################################################
# Run the scripts
####################################################
rm /tmp/log 2>/dev/null
xterm -e mutt -F /tmp/muttrc

================== End script ====================

-- System Information:
Debian Release: testing/unstable
APT prefers unstable
APT policy: (500, 'unstable')
Architecture: i386 (i686)
Kernel: Linux 2.6.7-1-k7
Locale: LANG=C, LC_CTYPE=C

Versions of packages bash depends on:
ii base-files 3.0.8 Debian base system miscellaneous f ii libc6 2.3.2.ds1-13 GNU C Library: Shared libraries an ii libncurses5 5.4-4 Shared libraries for terminal hand ii passwd 1:4.0.3-29 Change and administer password and

-- no debconf information




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