Alvaro Herrera <alvherre@alvh.no-ip.org> writes:
> On 2021-Jan-18, Tom Lane wrote:
>> [ thinks for a bit... ] Does the checkpointer pin pages it's writing
>> out? I guess it'd have to ...
> It does, per SyncOneBuffer(), called from BufferSync(), called from
> CheckPointBuffers().
Right, then we don't need any strange theories about autovacuum,
just bad timing luck. whelk does seem pretty slow, so it's not
much of a stretch to imagine that it's more susceptible to this
corner case than faster machines.
So, do we have any other tests that are invoking a manual vacuum
and assuming it won't skip any pages? By this theory, they'd
all be failures waiting to happen.
regards, tom lane
