| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Tomas Vondra <tomas(dot)vondra(at)2ndquadrant(dot)com> |
| Cc: | James Coleman <jtc331(at)gmail(dot)com>, Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>, Michael Paquier <michael(at)paquier(dot)xyz>, Rafia Sabih <rafia(dot)pghackers(at)gmail(dot)com>, Peter Geoghegan <pg(at)bowt(dot)ie>, Simon Riggs <simon(at)2ndquadrant(dot)com>, Shaun Thomas <shaun(dot)thomas(at)2ndquadrant(dot)com>, Dmitry Dolgov <9erthalion6(at)gmail(dot)com>, Alexander Korotkov <a(dot)korotkov(at)postgrespro(dot)ru>, PostgreSQL Developers <pgsql-hackers(at)lists(dot)postgresql(dot)org>, Andreas Karlsson <andreas(at)proxel(dot)se> |
| Subject: | Re: [PATCH] Incremental sort (was: PoC: Partial sort) |
| Date: | 2020-04-07 00:42:13 |
| Message-ID: | 2595.1586220133@sss.pgh.pa.us |
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| Lists: | pgsql-hackers |
Tomas Vondra <tomas(dot)vondra(at)2ndquadrant(dot)com> writes:
> It doesn't seem to be particularly platform-specific, but I've been
> unable to reproduce it so far. It seems on older gcc versions, though.
It's looking kind of like an uninitialized-memory problem. Note
the latest from spurfowl,
https://buildfarm.postgresql.org/cgi-bin/show_log.pl?nm=spurfowl&dt=2020-04-07%2000%3A15%3A05
which got through "make check" and then failed during pg_upgrade's
repetition of the test. Similarly on rhinoceros. So there's definitely
instability there even on one machine.
Perhaps something to do with unexpected cache flushes??
regards, tom lane
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