INSERT/UPDATE waiting

Hello,

somehow the backend is hanging on my system (6.5beta1, Linux 2.2.6):

postgres 29957  0.0  1.5  4124  2048  ?  S    18:23   0:00 /usr/local/pgsql/bin/postgres localhost lutzeb cs UPDATE
waiting
 
postgres 29980  0.0  1.6  4124  2064  ?  S    18:25   0:00 /usr/local/pgsql/bin/postgres localhost lutzeb cs UPDATE
waiting
 
postgres 30005  0.0  1.6  4124  2088  ?  S    18:27   0:00 /usr/local/pgsql/bin/postgres localhost lutzeb cs UPDATE
waiting
 
postgres 30012  0.0  2.1  4532  2696  ?  S    18:28   0:00 /usr/local/pgsql/bin/postgres localhost lutzeb cs INSERT
waiting
 
postgres 30030  0.0  3.0  5780  3916  ?  S    18:28   0:00 /usr/local/pgsql/bin/postgres localhost lutzeb cs idle


[about 34 processes]

What is happening here? Can't find anything in the documentation.

Dirk