Processes are incorrectly marked as swapped out

[Dmitry Sivachenko]

Hello!

After upgrade from stable/9 to stable/10 I see the following regression.
Some processes are marked as swapped out in top(1) output:

 1436 root            1  43    0 16524K     0K nanslp 14   1:14   0.00% <cron>
 1381 smmsp           1  20    0 23988K     0K pause  18   0:04   0.00% <sendma
99348 mitya           1  21    0 23492K     0K pause  16   0:00   0.00% <csh>

ps(1) also shows them as swapped out (W as second character in state field):
 1381  -  IWs       0:00.00 sendmail: Queue runner at 00:30:00 for /var/spool/clie
 1436  -  IWs       0:00.00 /usr/sbin/cron -s
80231  -  IWs       0:00.00 /usr/local/sbin/collectdmon -c /usr/local/sbin/coll
99348  1  IWs       0:00.00 -csh (csh)

Though swapinfo reports that zero swap is used and even if I turn swap completely off (swapoff -a)
the output of both top(1) and ps(1) does not change: these processes are still marked as swapped out.