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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