Repeated mounts

[Michael Abbott]

Here is something very strange (though I seem to remember a conversation 
on the subject here recently).  It would appear that every time I run 
`mount -a` all the entries in /etc/fstab are mounted again!  How is this 
even possible?

busybox version 1.15.2
kernel version 2.6.26 (maybe a bug in this kernel?  I'll try upgrading it)


Here is my /etc/fstab (there are some other file systems I mount first, 
you'll see them in the mount list below):

tmpfs       /tmp            tmpfs   mode=1777
varlog      /var/log        tmpfs   mode=755,nosuid
varrun      /var/run        tmpfs   mode=755,nosuid
varlock     /var/lock       tmpfs   mode=1777,nosuid,nodev,noexec
serv0005:/home2/libera/nfs /mnt/nfs nfs rw,intr
172.23.100.32:/exports/dls_sw/work /mnt/work nfs ro,intr
172.23.100.32:/exports/dls_sw/prod /mnt/prod nfs ro,intr


Finally, here is the output of `cat /proc/mounts` after running `mount -a` 
three times or so:

# cat /proc/mounts
rootfs / rootfs rw 0 0
proc /proc proc rw 0 0
sysfs /sys sysfs rw 0 0
mdev /dev tmpfs rw 0 0
devpts /dev/pts devpts rw,nosuid,noexec,gid=5,mode=620 0 0
devshm /dev/shm tmpfs rw,nosuid,nodev 0 0
tmpfs /tmp tmpfs rw 0 0
varlog /var/log tmpfs rw,nosuid 0 0
varrun /var/run tmpfs rw,nosuid 0 0
varlock /var/lock tmpfs rw,nosuid,nodev,noexec 0 0
serv0005:/home2/libera/nfs /mnt/nfs nfs 
rw,vers=3,rsize=8192,wsize=8192,namlen=255,hard,intr,proto=udp,timeo=7,retrans=3,sec=sys,mountproto=udp,addr=172.23.240.5 0 0
172.23.100.32:/exports/dls_sw/work /mnt/work nfs 
ro,vers=3,rsize=32768,wsize=32768,namlen=255,hard,intr,proto=udp,timeo=7,retrans=3,sec=sys,mountproto=udp,addr=172.23.100.32 0 0
172.23.100.32:/exports/dls_sw/prod /mnt/prod nfs 
ro,vers=3,rsize=32768,wsize=32768,namlen=255,hard,intr,proto=udp,timeo=7,retrans=3,sec=sys,mountproto=udp,addr=172.23.100.32 0 0
tmpfs /tmp tmpfs rw 0 0
varlog /var/log tmpfs rw,nosuid 0 0
varrun /var/run tmpfs rw,nosuid 0 0
varlock /var/lock tmpfs rw,nosuid,nodev,noexec 0 0
serv0005:/home2/libera/nfs /mnt/nfs nfs 
rw,vers=3,rsize=8192,wsize=8192,namlen=255,hard,intr,proto=udp,timeo=7,retrans=3,sec=sys,mountproto=udp,addr=172.23.240.5 0 0
172.23.100.32:/exports/dls_sw/work /mnt/work nfs 
ro,vers=3,rsize=32768,wsize=32768,namlen=255,hard,intr,proto=udp,timeo=7,retrans=3,sec=sys,mountproto=udp,addr=172.23.100.32 0 0
172.23.100.32:/exports/dls_sw/prod /mnt/prod nfs 
ro,vers=3,rsize=32768,wsize=32768,namlen=255,hard,intr,proto=udp,timeo=7,retrans=3,sec=sys,mountproto=udp,addr=172.23.100.32 0 0
tmpfs /tmp tmpfs rw 0 0
varlog /var/log tmpfs rw,nosuid 0 0
varrun /var/run tmpfs rw,nosuid 0 0
varlock /var/lock tmpfs rw,nosuid,nodev,noexec 0 0
tmpfs /tmp tmpfs rw 0 0
varlog /var/log tmpfs rw,nosuid 0 0
varrun /var/run tmpfs rw,nosuid 0 0
varlock /var/lock tmpfs rw,nosuid,nodev,noexec 0 0



It's rather odd that the nfs mounts only get mounted twice, while 
everything else seems to get remounted for each time I run mount.

I've never seen this peculiar behaviour before: any ideas what's causing 
it?