(My earlier post has been stuck in infinite moderation due to the use of a common 6 letter abbreviation for configuration, so I will try again without it)
With v10, commit 14ca9abfbe4643408a, the upper limit on bgwriter_lru_maxpages was changed from 1000 to INT_MAX / 2, but the postgresql.conf.sample was not updated.
#bgwriter_lru_maxpages = 100 # 0-1000 max buffers written/round
I don't see any precedence for including INT_MAX-type limits in the sample configuration file, so maybe something like this:?
#bgwriter_lru_maxpages = 100 # max buffers written/round, 0 to turn off
Cheers,
Jeff