in rules.d/20-names.rules, I changed the following line:
KERNEL=="dm-[0-9]*", NAME="dm/%n"
to the following: KERNEL=="dm-[0-9]*", NAME="dm/%n",OPTIONS+="ignore_device"
and voila, the problem has vanished.so this really seems to be debian #343671
in rules.d/ 20-names. rules, I changed the following line:
KERNEL= ="dm-[0- 9]*", NAME="dm/%n"
to the following: ="dm-[0- 9]*", NAME="dm/ %n",OPTIONS+ ="ignore_ device"
KERNEL=
and voila, the problem has vanished.so this really seems to be debian #343671