Re: REINDEX INDEX results in a crash for an index of pg_class since 9.6

Andres Freund <andres(at)anarazel(dot)de> writes:
> On 2019-05-02 16:54:11 -0400, Tom Lane wrote:
>> How do you feel about the other patch to rejigger the order of operations
>> in CommandCounterIncrement? I think that's a bug, but it's probably
>> noncritical for most people. What I'm leaning towards for that one is
>> waiting till after the minor releases, then pushing it to all branches.

> I've not yet have the mental cycles to look more deeply into it. I
> thought your explanation why the current way is wrong made sense, but I
> wanted to look a bit more into how it came to be how it is now.

Well, I wrote that code, and I can say pretty confidently that this
failure mode just didn't occur to me at the time.

> I agree
> that pushing after the minors would make sense, it's too subtle to go
> for it now.

It is subtle, and given that it's been there this long, I don't feel
urgency to fix it Right Now. I think we're already taking plenty of
risk back-patching the REINDEX patch :-(

regards, tom lane