On Mon, Apr 04, 2016 at 12:45:25PM -0400, Robert Haas wrote:
> Backends shouldn't be requesting nonexistent blocks from a relation -
> higher-level safeguards, like holding AccessExclusiveLock before
> trying to complete a DROP or TRUNCATE - are supposed to prevent that.
> If this patch is causing us to hold onto smgr references to a relation
> on which we no longer hold locks, I think that's irretrievably broken
> and should be reverted.  I really doubt this will be the only thing
> that goes wrong if you do that.


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