Problem with pg_upgrade?

I have gotten two reports via IRC that months after using 9.0
pg_upgrade, some of the clog files have been removed while there is
still data in the table needing those clog files. These reports came to
me through Rhodiumtoad who analyzed the systems.

Looking at pg_upgrade, I am concerned that somehow autovaccum is running
in frozen mode before I have restored the frozen xids for the table or
database. Here is the code I am using:

snprintf(cmd, sizeof(cmd),
SYSTEMQUOTE "\"%s/pg_ctl\" -l \"%s\" -D \"%s\" "
"-o \"-p %d -c autovacuum=off "
"-c autovacuum_freeze_max_age=2000000000\" "
"start >> \"%s\" 2>&1" SYSTEMQUOTE,
bindir,

Does anyone have any other suggestions on how to make sure autovacuum
does not run in freeze mode? I know 'autovacuum=off' turns off normal
autovacuum. Would increasing autovacuum_naptime help? It looks like
the autovacuum code sleeps before processing anything, but I am not
certain.

--
Bruce Momjian <bruce(at)momjian(dot)us> http://momjian.us
EnterpriseDB http://enterprisedb.com

+ It's impossible for everything to be true. +