Re: [PATCH] plpython function causes server panic

On Fri, Mar 22, 2024 at 1:52 PM Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> Robert Haas <robertmhaas(at)gmail(dot)com> writes:
> > I agree with the general direction. A few comments:
>
> > - Isn't it redundant to test if IsInParallelMode() ||
> > IsParallelWorker()? We can't be in a parallel worker without also
> > being in parallel mode, except during the worker startup sequence.
>
> Hmm. The existing code in AssignTransactionId and
> CommandCounterIncrement tests both, so I figured that the conservative
> course was to make DefineSavepoint and friends test both. Are you
> saying AssignTransactionId and CommandCounterIncrement are wrong?
> If you're saying you don't believe that these routines are reachable
> during parallel worker start, that could be true, but I'm not sure
> I want to make that assumption. In any case, surely the xxxSavepoint
> routines are not hot enough to make it an interesting
> micro-optimization. (Perhaps it is worthwhile in AssignTransactionId
> and CCI, but changing those seems like a job for another patch.)

Yeah, that's all fair enough. I went back and looked at the history of
this and found 94b4f7e2a635c3027a23b07086f740615b56aa64.

--
Robert Haas
EDB: http://www.enterprisedb.com