Allow Pin/UnpinBuffer to operate in a lockfree manner.
I get the errors:

ERROR:  attempted to delete invisible tuple
ERROR:  unexpected chunk number 1 (expected 2) for toast value

Just reminder, you investigate "unexpected chunk number" problem, but, seems, we have another bug (first ERROR: attempted to delete invisible tuple). IMHO, it's a separate bug, not related to oid. Unfortunately, I've never seen such error on my notebook.

Teodor Sigaev                                   E-mail:

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