The symptom was umount2 couldn't unmount /usr. We added a diagnostic
mod to /etc/rc.d/init.d/halt. Adding a call to /sbin/fuser to find the offending
pid(s) and then to /sbin/lsof to see exactly what files were preventing the
umount we got:
COMMAND PID USER FD TYPE DEVICE SIZE NODE NAME
... bunch of irrelevant stuff snipped ....
S01halt 1065 root 3r REG 3,3 30306528 214860
/usr/lib/locale/locale-archive S01halt 1065 root 255r REG 3,7
5575 96095 /etc/rc.d/init.d/halt
The file /etc/rc.d/init.d/halt incorporates /etc/rc.d/init.d/functions. The /usr
locale file turned out to be called up by /etc/rc.d/init.d/functions in the line
which goes something like this:
if [ -f /etc/sysconfig/i18n ] ..... <do locale stuff>
Somehow I had installed i18n (the international set). In the spirit of
adventure, I renamed /etc/sysconfig/i18n to /etc/sysconfig/i18n.notnow.
Several hot and cold reboots (with my rescue disk handy) indicated that the
original symptom was fixed with no degradation of other programs after
renaming the i18n file.
This is certainly not the only way you can end up with umount2 errors
in RH or any other distribution. The error mesage you get is rather ..er..
terse (although it is definitely better than "Unknown Vxd Error: Windows Will
Close Now").
If your filesystems are ext3, you may not suffer much of an annoyance.
However, ext2 will run a <lengthy> fsck on the errant mount on the next
boot, and it is unlikely that you won't notice it.
Here is one possible diagnostic mod to /etc/rc.d/init.d/halt (this one
assumes there is only one errant mount . Make a copy of /etc/rc.d/init.d/halt
before making this mod . Similar code works for me, your mileage may
vary.) :
..............<snip>
fi
sleep 8
remaining=`halt_get_remaining |sort -r`
+ garbage=`/sbin/fuser -m $remaining |awk -F: ' {print $2}'`
+ echo $garbage
+ for entries in $garbage; do
+ entry=`echo $entries |sed s/[a-z]//`
+ echo "PID: " $entry
+ /sbin/lsof -p $entry |grep $remaining
+ ps ax |grep $entry | grep -v grep;
+ done
/sbin/fuser -k -m $remaining > /dev/null
sleep 5
............<snip> .
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