3rd and last attempt to post this
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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