There is a scheduled downtime of Cluster32 starting on Wednesday, March 9 at 8 o’clock in the morning with open end. It is expected that Cluster32 is available again for user operation in the late afternoon of Thurday, March 10!

As major software components will be upgraded (Linux kernel 2.4.x => 2.6.y, glibc 2.2.x => 2.3.y) throrough testing will be required … As we cannot test all applications your help is required. Contact hpc@rrze in case of problems – but do not forget to give a detailed description of the problem.

Error message “symbol errno, version GLIBC_2.0 not defined in file libc.so.6”: If you happen to see the above error message about the symbol errno, the program is broken! It is NOT a bug of our Cluster32.

The program probably says “extern int errno” somewhere instead of including . Glibc versions older than 2.3 did not report this problem. However, errno in recent glibc versions is a macro, which calls the function __errno_location; when glibc is built with thread-local storage enabled, there is no extern int variable named errno. In addition, “extern int errno” is not thread-safe.

The program should continue to run if you export LD_ASSUME_KERNEL=2.4.0 disabling NPTL and thread-local storage. Sometimes, you might even need to use LD_ASSUME_KERNEL=2.2.0.

But the problem should really be fixed in the original program. Complain with the supplier of the software!

See e.g. a page from Novell or a posting to the Debian mailinglist from 2003, or the file /usr/share/doc/libc6/README.Debian.gz for more details.