Statistic collector too many fork

Hi to all,
Is it normal that after a while is like if the statistics collector fork a
lot
of time in only one second ?

Oct 11 16:51:28 pserver2 postgres[8898]: [1943390] DEBUG: reaping dead
processes
Oct 11 16:51:28 pserver2 postgres[8898]: [1943391] DEBUG: statistics
collector process (pid 16882) exited with exit code 1
Oct 11 16:51:28 pserver2 postgres[8898]: [1943392] DEBUG: reaping dead
processes
Oct 11 16:51:28 pserver2 postgres[8898]: [1943393] DEBUG: statistics
collector process (pid 16884) exited with exit code 1
Oct 11 16:51:28 pserver2 postgres[8898]: [1943394] DEBUG: reaping dead
processes
Oct 11 16:51:28 pserver2 postgres[8898]: [1943395] DEBUG: statistics
collector process (pid 16886) exited with exit code 1
Oct 11 16:51:28 pserver2 postgres[8898]: [1943396] DEBUG: reaping dead
processes
Oct 11 16:51:28 pserver2 postgres[8898]: [1943397] DEBUG: statistics
collector process (pid 16888) exited with exit code 1
Oct 11 16:51:28 pserver2 postgres[8898]: [1943398] DEBUG: reaping dead
processes
Oct 11 16:51:28 pserver2 postgres[8898]: [1943399] DEBUG: statistics
collector process (pid 16890) exited with exit code 1
Oct 11 16:51:28 pserver2 postgres[8898]: [1943400] DEBUG: reaping dead
processes
Oct 11 16:51:28 pserver2 postgres[8898]: [1943401] DEBUG: statistics
collector process (pid 16892) exited with exit code 1
Oct 11 16:51:28 pserver2 postgres[8898]: [1943402] DEBUG: reaping dead
processes
Oct 11 16:51:28 pserver2 postgres[8898]: [1943403] DEBUG: statistics
collector process (pid 16894) exited with exit code 1
Oct 11 16:51:28 pserver2 postgres[8898]: [1943404] DEBUG: reaping dead
processes
[SNIPP]

and a lot more.

At the end my partition was full, now I don't know what was the cause (disk
almost full / to many line in the log )
and the effect ( statistics collector bug / disk full ).

Ciao
Gaetano