New MB and Processor and gzip/bzip2 does not work anymore

I am using suse for a long time but I did not yet experience this strange error:

I installed 11.2 and now 11.3RC1 on a new HW:
ASUS M4N72-E with AMD Phenom2 X4 965, 8GB Memory, standard settings.

I experienced unusual errors when copying large files to the new system with scp/ssh (connection broken).

Even stranger I could not read .tgz files created on the older machine, same OS 11.2, but
MB ASUS M2N32-SLI with AMD Phenom X4 9850

Testing further reveals that if I create a .gz file from the same source it produces every time a different output:
-rw-r–r-- 1 root root 3875041280 Jun 21 01:51 wwtest.tar
-rw-r–r-- 1 root root 1326141906 Jun 21 01:55 wwtest1.tar.gz
-rw-r–r-- 1 root root 1326137319 Jun 21 03:26 wwtest2.tar.gz
-rw-r–r-- 1 root root 1326146273 Jun 22 07:32 wwtest3.tar.gz
-rw-r–r-- 1 root root 1326136894 Jun 22 23:47 wwtest4.tar.gz
-rw-r–r-- 1 root root 1326127822 Jun 22 23:57 wwtest5.tar.gz

and when restoring back they all fail with some error like:
linux-hfob:/d/sdb6 # gunzip wwtest5.tar.gz

gzip: wwtest5.tar.gz: invalid compressed data–crc error

gzip: wwtest5.tar.gz: invalid compressed data–length error
linux-hfob:/d/sdb6 #

I never saw something like it, I guess it must be something with the underlying library not working on the new processor.
I tried with slower memory speed, newest BIOS etc …always the same errors.
Other wise the system works absolutely stable.

When I compare the generated files with one created on the older system it looks like there are single bits missing in a random number of bites.

Any ideas?
Thanks a lot
Christian Eva

On Tue, 22 Jun 2010 23:46:02 +0000, phoinix wrote:

> Any ideas?

CRC errors might point to a memory fault. I’d suggest starting by
running memtest86 for a thorough check (let it run for several hours) and
see what it reports back.


Jim Henderson
openSUSE Forums Administrator

Dear Jim,
that was spot on!
I installed memtest86 and it revealed right away that the upper part of the 8GB did not cope with some patterns!
This was not recognized by the MB long boot!

The gzip/gunzip works again as it should. As it was high up, the errors showed only with the ‘big’ files and explains also that the cpio over ssh did not work when the data was bigger than 4 GB…

With hindsight I should have thought of it -
just not used so much to computers without ECC.

Thanks a lot again and I will go to bed with memtest86!