Re: [Openexr-devel] Issue with libz library 1.2.x version and OpenEXR

[Wayne Wooten]

  We have had customers complain of seg faults in the OpenEXR  
display drivers in prman
 when using them on FC4. We thought it might be related to libzip,  
but were never able to
 fully track it down.

   Now we can suggest folks revert libzip on these machines and  
hopefully their problems will
 be resolved.

   --Wayne

On Mar 31, 2006, at 3:40 AM, Jeff Clifford wrote:

> Hi,
>
> I have successfully compiled up 32 and 64-bit versions of the  
> openEXR libs for our 64-bit Fedora Core 4 machines.
>
> The libraries have been working fine until I used ZIP compression  
> when writing a file.  This caused a seg fault at the line:
>
>    file.writePixels( header.dataWindow().max.y - header.dataWindow 
> ().min.y + 1);
>
> Suspicious of an error else where in code I ran the program through  
> Valgrind to check if they were any other causes and where exactly  
> the problem was.  There were no other errors, just this:
>
> ==8576== Invalid write of size 2
> ==8576==    at 0x342FE0582B: (within /usr/lib64/libz.so.1.2.2.2)
> ==8576==    by 0x342FE0478E: deflate (in /usr/lib64/libz.so.1.2.2.2)
> ==8576==    by 0x342FE025BB: compress2 (in /usr/lib64/libz.so.1.2.2.2)
> ==8576==    by 0x55C08B: Imf::ZipCompressor::compress(char const*,  
> int, int, char const*&) (in /u/jbc/tools/bin/Linux64/exrwriter)
> ==8576==    by 0x5557B7: Imf::OutputFile::writePixels(int) (in /u/ 
> jbc/tools/bin/Linux64/exrwriter)
>
> If I change the line
>
> header.compression() = Imf::ZIP_COMPRESSION;
>
> to any other compression (except ZIPS) or no compression everything  
> works fine.
>
>
> I then decided to check what version of the zlib came on the 32-bit  
> RedHat9 machines machines which worked fine with no seg fault (1.1.4).
>
> First off I tried upping the zlib version to 1.2.3 (the latest  
> release) but still the seg fault occured.
>
> I then rolled back the version of zlib on our Fedora Core 4  
> machines to 1.1.4 and the seg fault stopped.  I found that rolling  
> back both the 32-bit and 64-bit versions of the zlib library fixed  
> both the 32-bit and 64-bit verions of the program on the Fedora  
> Core 4 machines.
>
> I just wondered if this is a known issue or whether anyone else has  
> any experience of such problems?  Is there something I need to do  
> to be able to use the later zlib version?
>
>
> Thanks,
>
> Jeff Clifford.
>
>
>
>
>
>
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