> Anyway I will make /etc/mtab as a regular file and disable
> mtab_migrate() shell function in /lib/init/mount-functions.sh on wheezy
> since this problem is a show-stopper for me.
I've met another problem of /bin/umount (mount package).
But this is specific to the system where /etc/mtab is a regular file. I
know the file on wheezy is a symlink, so I stopped registering another
new bug.
Here are the output and my test script.
Unmounting $B, umount(8) writes a broken entry
("none rw,bind 0 0 0 0") in /etc/mtab.
(there are very very long pathname in the output, and I omitted them by
replacing "...")
----------------------------------------------------------------------
$ sh ./a.sh
Linux jrofr 3.2.0-4-amd64 #1 SMP Debian 3.2.46-1 x86_64 GNU/Linux
-rw-r--r-- 1 root root 1427 Jul 24 17:41 /etc/mtab
+ egrep -n (/tmp/|bind) /etc/mtab /proc/mounts
/etc/mtab:19:/debug /sys/kernel/debug none rw,bind 0 0
/etc/mtab:28:/tmp/2940 /tmp/01234...567892222222.55 none rw,bind 0 0
/etc/mtab:29:/tmp/01234...567892222222.55 /tmp/2940 none rw,bind 0 0
/etc/mtab:30:/tmp/01234...567892222222.55 /tmp/01234...567892222222.4 none
rw,bind 0 0
/proc/mounts:29:tmpfs /tmp/01234...567892222222.55 tmpfs rw,relatime 0 0
/proc/mounts:30:tmpfs /tmp/2940 tmpfs rw,relatime 0 0
/proc/mounts:31:tmpfs /tmp/01234...567892222222.4 tmpfs rw,relatime 0 0
+ echo * unmount B
* unmount B
+ sudo umount /tmp/01234...567892222222.55
+ egrep -n (/tmp/|bind) /etc/mtab /proc/mounts
/etc/mtab:19:/debug /sys/kernel/debug none rw,bind 0 0
/etc/mtab:28:/tmp/01234...567892222222.55 /tmp/2940 none rw,bind 0 0
/etc/mtab:29:none rw,bind 0 0 0 0
/proc/mounts:29:tmpfs /tmp/2940 tmpfs rw,relatime 0 0
/proc/mounts:30:tmpfs /tmp/01234...567892222222.4 tmpfs rw,relatime 0 0
:::
----------------------------------------------------------------------
#!/bin/sh
set -eu
ten=0123456789
hundred=$ten$ten$ten$ten$ten$ten$ten$ten$ten$ten
hundred2=$hundred$hundred
n1004=$hundred2/$hundred2/$hundred2/$hundred2/$hundred2
#test $(echo -n $n1004 | wc -c) -eq 1004
n4019=$n1004/$n1004/$n1004/$n1004
base=/tmp/$n4019
# n4080=$base/$ten$ten$ten$ten${ten}00080
# test $(echo -n $n4080 | wc -c) -eq 4080
# tmp=$n4080
n4092=$base/$ten$ten$ten$ten$ten${ten}2222222
test $(echo -n $n4092 | wc -c) -eq 4092
tmp=$n4092
A=/tmp/$$
B=$tmp.55
test $(echo -n $B | wc -c) -eq 4095
C=$tmp.4
test $(echo -n $C | wc -c) -eq 4094
alias f="egrep -n '(/tmp/|bind)' /etc/mtab /proc/mounts"
alias msg="echo '*'"
#set -x
uname -a
ls -l /etc/mtab
mkdir -p $A $B $C
#f
sudo mount -t tmpfs tmpfs $A
#f
sudo mount -o bind $A $B
#f
sudo umount $A
#f
sudo mount -o bind $B $A
#f
sudo mount -o bind $B $C
set -x
f
msg unmount B
sudo umount $B
f
msg unmount A
sudo umount $A
f
msg bind C to A
sudo mount -o bind $C $A
f
msg unmount C
sudo umount $C
f
msg unmount A
sudo umount $A || :
f
set +x
rm -r $base
----------------------------------------------------------------------
Because of Bug#717547, I had to keep /etc/mtab as a regular file. But
this leads to another problem. Finally I cannot continue my
development on wheezy. Ouch!!
J. R. Okajima
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