I hadto digg quite a little before finding what mounted it automatically.
I made a very small change to /etc/udev/scripts/mount.sh that would avoid mounting automatically entries that have noauto option in fstab.
If anyone is intrested here is the diff (unfortunately indentation has gone to hell) :
*** /etc/udev/scripts/mount.sh 1970-01-01 00:00:00.000000000 +0000
--- scripts/mount.sh 2006-08-11 15:32:30.000000000 +0000
***************
*** 61,67 ****
if [ "$ACTION" = "add" ] && [ -n "$DEVNAME" ]; then
if grep "^$DEVNAME" /etc/fstab >/dev/null ; then
! mount $DEVNAME
exit 0
fi
get_mount_dir
--- 61,67 ----
if [ "$ACTION" = "add" ] && [ -n "$DEVNAME" ]; then
if grep "^$DEVNAME" /etc/fstab >/dev/null ; then
! [ $(grep -v noauto /etc/fstab |grep -c "^$DEVNAME") -ge 1 ] && mount $DEVNAME
exit 0
fi
get_mount_dir