cvs tip - stats buffer process consuming 100% cpu

I just noticed that the stats buffer process is consuming 100% cpu as 
soon as a backend is started, and continues after that backend is ended:
  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
15150 postgres  25   0 27004  948  508 S 99.9  0.0   0:30.97 postmaster


# ps -ef |grep 15150
postgres 15150 15143 78 11:29 pts/3    00:00:38 postgres: stats buffer 
process
postgres 15151 15150  0 11:29 pts/3    00:00:00 postgres: stats 
collector process


(gdb) bt
#0  0x000000383b8c2633 in __select_nocancel () from /lib64/libc.so.6
#1  0x000000000055e896 in PgstatBufferMain (argc=Variable "argc" is not 
available.
) at pgstat.c:1921
#2  0x000000000055f73b in pgstat_start () at pgstat.c:614
#3  0x0000000000562fda in reaper (postgres_signal_arg=Variable 
"postgres_signal_arg" is not available.
) at postmaster.c:2175
#4  <signal handler called>
#5  0x000000383b8c2633 in __select_nocancel () from /lib64/libc.so.6
#6  0x0000000000560d0f in ServerLoop () at postmaster.c:1180
#7  0x0000000000562443 in PostmasterMain (argc=7, argv=0x88df20) at 
postmaster.c:943
#8  0x00000000005217fe in main (argc=7, argv=0x88df20) at main.c:263

I noticed a recent discussion on the stats collector -- is this related 
to a recent change?

Joe