ST_Multi seg faults

[kneufeld]

What steps will reproduce the problem?

1. SELECT ST_Multi('MULTILINESTRING((0 0,1 1))');

What is the expected output? multi

---

01050000000100000001020000000200000000000000000000000000000000000000000000000000F03F000000000000F03F

(1 row)

What do you see instead? server closed the connection unexpectedly

This probably means the server terminated abnormally before or while processing the request.

The connection to the server was lost. Attempting reset: Failed.

What version of the product are you using? On what operating system? PostgreSQL 8.3.5, POSTGIS='1.4.0SVN'

Apparently the same happens for 1.3.4

[mcayland]

Hmmmm. I get this on 1.4.0SVN (x86_64):

postgis=# SELECT ST_Multi('MULTILINESTRING((0 0,1 1))'); ERROR: Dimensions mismatch in lwcurve

Looks similar to the error message that was reported by William Kyngesburye when trying to clean geometries…

ATB,

Mark.

[robe]

I think I found the smoking gun. Shouldn't lwgeom_contains_subgeoms have a line for MULTILINETYPE? — take a look at lwgeom_dump.c around line 56.

[mcayland]

Good spot Regina! For some reason, this doesn't segfault on my machine but just returns a slightly wrong answer?! Anyway, the fix looks good.

ATB,

Mark.

[robe]

I tested the patch on 1.3 but I'm still getting my system back to 1.4 so haven't tested the 1.4 patch. If you can confirm the 1.4 patch works, that will be great.

[mcayland]

Hi Regina,

Looks good to me on both 1.3 branch and trunk.

ATB,

Mark.

[mcayland]

Kevin,

Are you happy for this to be marked as Fixed?

ATB,

Mark.

[kneufeld]

Yes, the fix works for me now as well.

Great work, Kevin