| From: | Tomas Vondra <tomas(dot)vondra(at)2ndquadrant(dot)com> |
|---|---|
| To: | Martin Liška <marxin(dot)liska(at)gmail(dot)com> |
| Cc: | pgsql-bugs(at)lists(dot)postgresql(dot)org, PG Bug reporting form <noreply(at)postgresql(dot)org> |
| Subject: | Re: BUG #15121: Multiple UBSAN errors |
| Date: | 2018-03-19 14:26:12 |
| Message-ID: | 46a345c1-1f8d-fd0d-c334-d8ca577719a9@2ndquadrant.com |
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| Lists: | pgsql-bugs |
On 03/19/2018 09:59 AM, Martin Liška wrote:
> On 19 March 2018 at 01:34, Tomas Vondra <tomas(dot)vondra(at)2ndquadrant(dot)com> wrote:
>
> ...
>>
>> Again, the line numbers don't really match the code I have, but I guess
>> it's the same issue as for pg_comp_crc32c_sse42. This is apparently
>> related to array serialization, and I guess we have a compact structure
>> (intentionally, to make it smaller), and we accept the unaligned access.
>
> Note that building postgresql with -03, I see some array tests failing.
>
I'm unable to reproduce that. I do get a bunch of compile-time warnings
about possibly uninitialized variables (which seem bogus after a quick
inspection), but no failures.
Which gcc version are you using? Mine is 6.4.1. Do the failures happen
every time or rarely?
regards
--
Tomas Vondra http://www.2ndQuadrant.com
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
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