[CentOS] 40 second delay on automounts with 2.6.18-53.1.21.el5 kernel

after this latest centos 5 kernel update, i am seeing 40 second delays on 
automount points.  nothing in the rpm changelog looks obviously related to 
autofs and the autofs module seems to be the same as the previous kernel. 
i'm starting to do some strace'ing and other debugging, but nothing has 
jumped out at me yet.  i'm hoping someone else has seen it so i know i'm 
not alone :-).