Re: pgsql: ltree: Zero padding bytes when allocating memory for externally

I wrote:
> Andres Freund <andres@anarazel.de> writes:
>> This is marked as the originating commit for a failure on dromedary:
>> http://pgbuildfarm.org/cgi-bin/show_log.pl?nm=dromedary&dt=2016-03-08%2023%3A27%3A02
>> the origin of the failure is:
>> FATAL:  no PostgreSQL user name specified in startup packet
>> while in the 'comments' tests, which looks fairly independent of this commit.

>> Tom, did you happen to change config on that machine or anything?

> No, haven't touched it in awhile.  Looks like just a glitch maybe?

I had a vague feeling that this looked familiar, and it occurred to me
to scan the buildfarm database for occurrences of that error message.
Quite a few hours later, I have these results:

  sysname  |      snapshot       | count
-----------+---------------------+-------
 okapi     | 2012-05-10 06:15:02 |   138
 okapi     | 2012-05-20 00:15:02 |   174
 dromedary | 2014-03-28 00:13:52 |     4
 dromedary | 2014-05-07 06:23:09 |     2
 dromedary | 2016-03-08 23:27:02 |     2

So yeah, we've seen it before, but it sure looks like a system-specific
glitch.  dromedary is a pretty old machine (2006 Mac mini), so I would not
be surprised if it dropped a bit now and then.

            regards, tom lane