Is this message the sign of trouble, or is it harmless?

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TIP 4: Don't 'kill -9' the postmaster

Michael Guerin <guerin (AT) rentec (DOT) com> writes:
It's not good. The least bad explanation is that you had a system crash
recently that occurred between extending a table by one page and filling
that page with useful data. (The page is filled with zeroes on creation.)
If you haven't had any crashes lately then I'd wonder about whether your
disk is dropping data.

regards, tom lane

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TIP 4: Don't 'kill -9' the postmaster

Tom Lane wrote:

having lately?

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Michael Guerin <guerin (AT) rentec (DOT) com> writes:
No, more the other way around. IIRC, "page n is uninitialized" is
VACUUM's report that it is fixing an invalid page header.

regards, tom lane

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TIP 8: explain analyze is your friend