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Re: Unresolved error 0xC0000409 on Windows Server

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Matthew Gerber <gerber(dot)matthew(at)gmail(dot)com>
Cc: Craig Ringer <ringerc(at)ringerc(dot)id(dot)au>, Noah Misch <noah(at)leadboat(dot)com>, Merlin Moncure <mmoncure(at)gmail(dot)com>, pgsql-hackers(at)postgresql(dot)org
Subject: Re: Unresolved error 0xC0000409 on Windows Server
Date: 2012-11-04 19:30:38
Message-ID: 21226.1352057438@sss.pgh.pa.us (view raw or flat)
Thread:
Lists: pgsql-hackers
Matthew Gerber <gerber(dot)matthew(at)gmail(dot)com> writes:
>> Here is the command that was executing when the 0xC0000409 exception was
>> raised:
>> INSERT INTO places (bounding_box,country,full_name,id,name,type,url)
>> VALUES
>> (st_transform_null(ST_GeometryFromText('POLYGON((-97.034085
>> 32.771786,-97.034085 32.953966,-96.888789 32.953966,-96.888789
>> 32.771786,-97.034085 32.771786))',4326),26918),'United States','Irving,
>> TX','dce44ec49eb788f5','Irving','city','
>> http://api.twitter.com/1/geo/id/dce44ec49eb788f5.json'),

Assuming that 0xC0000409 does actually represent a stack-overrun
condition, it doesn't seem like there are very many ways that could
happen on such a simple command.  The best theory that is coming to mind
is that you hit some corner case in the GiST code that is causing the
index-entry-insertion attempt to recurse infinitely, or at least enough
times to hit the stack limit.  (I exclude the theory of infinite
recursion in the btree indexes only on the grounds that those are so
much better tested than GiST that the idea seems improbable.)  It's not
clear yet whether the bug is in the generic GiST code or in the
PostGIS-provided index operator class.

If that is the explanation, then hitting the crash would likely depend
not only on the specific bounding_box value being inserted, but also on
the previous state of the places_bounding_box_idx index, which could
make it darn hard to reproduce.  If you can't easily create a reproducer
script, I think we'll have to ask you for a stack trace from the crash.
See
https://wiki.postgresql.org/wiki/Generating_a_stack_trace_of_a_PostgreSQL_backend

			regards, tom lane


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Subject: Re: SP-GiST for ranges based on 2d-mapping and quad-tree
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