MapServer incompatibility with RHEL4/CE NTOS4.2

[Doyon, Jean-Francois]

I tried moving the RedHat 7.3 binary that I know works fine to a CentOS 4.2
system, and wham, the problem appeared!

I also investigated trying to run multiple glibc's to see if that might be
the problem (i.e. install the RedHat 7.3 glibc on CentOS for the use of
MapServer), but that looks like quite the nightmare to try out ...

J.F. 

-----Original Message-----
From: UMN MapServer Users List [mailto:MAPSERVER-USERS at LISTS.UMN.EDU] On
Behalf Of Doyon, Jean-Francois
Sent: March 3, 2006 10:28 AM
To: MAPSERVER-USERS at LISTS.UMN.EDU
Subject: Re: [UMN_MAPSERVER-USERS] MapServer incompatibility with RHEL4/CE
NTOS4.2

OK, we're running 32 bit CentOS 4.2, on Xeon processors.

I'm thinking there's some problem with the newer glibc or something like
that, which would also explain the crashes I was having at first on a
specific map?

J.F. 

-----Original Message-----
From: UMN MapServer Users List [mailto:MAPSERVER-USERS at LISTS.UMN.EDU] On
Behalf Of Doyon, Jean-Francois
Sent: March 3, 2006 9:56 AM
To: MAPSERVER-USERS at LISTS.UMN.EDU
Subject: Re: [UMN_MAPSERVER-USERS] MapServer incompatibility with RHEL4/CE
NTOS4.2

Lowell,

Indeed! These are 64 bit CPU's! (Intel Xeon, Dell PowerEdge 1850's)

And we're running CentOS, though I'm not sure whether it's the i386 version,
or the x86_64 one, I'll look into that.

I've also replicated the problem on a Pentium 4 machine though, which is 32
bit, though with what intel calls EM64T technology.

Could it be the HyperThreading?

J.F.

-----Original Message-----
From: Lowell.Filak [mailto:lfilak at medinaco.org]
Sent: March 3, 2006 9:41 AM
To: Doyon, Jean-Francois
Cc: MAPSERVER-USERS at LISTS.UMN.EDU
Subject: Re: [UMN_MAPSERVER-USERS] MapServer incompatibility with
RHEL4/CENTOS4.2

Doyon, Jean-Francois writes: 

> Hello,
> 
> OK well I've tracked down the source of my problem to the operating 
> system itself it seems.
> 
> Regardless of the versions/combinations of mapserver/gd/freetype I 
> use, there are definite visual rendering problems when on this OS.  On 
> RedHat 7.3, everything is fine!
> 
> Example: 
> 
> http://atlas.gc.ca/family-good.gif
> http://atlas.gc.ca/family-bad.gif
> 
> Note the small dot that appears on the symbol? 
> 
> Also: 
> 
> http://atlas.gc.ca/the-market-good.gif
> http://atlas.gc.ca/the-market-bad.gif
> 
> Notice how on the bad version, a bunch of point symbols are missing? 
> 
> I tried various combinations of: 
> 
> MapServer 4.6.1 and 4.8.1
> FreeType 2.0.9 and 2.1.9
> GD 2.0.28 and 2.0.33
> 
> A given combination works on 7.3, but not on CentOS. 
> 
> Without luck.  The problem with the strange shape of the symbols ( 
> http://atlas.gc.ca/mapserver-symbol-problem.png ) seemes to be related 
> to the version of FreeType for some reason?  FreeType 2.0.9 acts as we 
> expect it to, FreeType 2.1.9 does not.  There may be cumulative 
> effects
also.
> 
> CentOS 4.2 uses GCC 3.4.4 and GLIBC 2.3.4.  I had gotten a horrible 
> crash message at some point with a version of mapserver on this OS
> (http://lists.umn.edu/cgi-bin/wa?A2=ind0602&L=mapserver-users&P=R60802
> &I=-3& X=106ECE1CAE6B73E23F), but upgrading from 4.6.1 to 4.8.1 had 
> fixed it.  This was related to memory allocation.  Could something 
> related to that be causing this?  Turns out I've got 4.6.1 running on 
> this platform now, but that really didn't help.
> 
> I'm out of ideas :( Anyone?

J.F., 

Is the 7.3 box a 32-bit and the RHEL box a 64-bit kernel by any chance (you
may have already stated that in your previous "double free detected.." post
but I don't remember). Not that I know of a particular fix, but we have
certainly had strange problems here also. 

Lowell