| From: | Christoph Berg <christoph(dot)berg(at)credativ(dot)de> |
|---|---|
| To: | Pg Hackers <pgsql-hackers(at)postgresql(dot)org> |
| Cc: | Thomas Munro <thomas(dot)munro(at)enterprisedb(dot)com>, Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>, Bernd Helmle <bernd(at)oopsware(dot)de>, Andreas Seltenreich <andreas(dot)seltenreich(at)credativ(dot)de> |
| Subject: | Re: 9.3.9 and pg_multixact corruption |
| Date: | 2015-09-20 14:23:05 |
| Message-ID: | 20150920142305.GC31429@msg.df7cb.de |
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| Lists: | pgsql-hackers |
Re: Andreas Seltenreich 2015-09-13 <87si6i1875(dot)fsf(at)credativ(dot)de>
> I managed disassemble RecordNewMultiXact from the core dump using a
> cross-binutils, and it reveals that the compiler[1] appears to have
> indeed generated a signed division here. I'm attaching a piece of C
> code that does the same computation as the assembly (I think), as well
> as the disassembly itself.
>
> Footnotes:
> [1] Sun C 5.12 SunOS_sparc Patch 148917-07 2013/10/18, 64-bit
Hi,
a short update here: the customer updated the compiler to a newer
version, is now compiling using -O2 instead of -O3, and the code
generated now looks sane, so this turned out to be a compiler issue.
(Though it's unclear if the upgrade fixed it, or the different -O
level.)
Thanks to all who provided feedback, it was very valuable in actually
tracking down the root of the issue.
Christoph
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