Robert Haas <> writes:
> On Thu, Mar 1, 2018 at 2:03 AM, Craig Ringer <> wrote:
>> So I can't say it's definitely impossible. It seems astonishingly unlikely,
>> but that's not always good enough.

> Race conditions tend to happen a lot more often than one might think.

Just to back that up --- we've seen cases where people could repeatably
hit race-condition windows that are just an instruction or two wide.
The first one I came to in an idle archive search is
I vaguely recall others but don't feel like digging harder right now.

                        regards, tom lane

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