initdb failure on RH 5.10

Hi,

One of our sites ran into a problem with database installation:

initdb failed
FATAL: unexpected data beyond EOF in block 19 of relation base/1/2609
HINT: This has been seen to occur with buggy kernels; consider updating your system.
STATEMENT: COMMENT ON FUNCTION euc_jis_2004_to_shift_jis_2004
(INTEGER, INTEGER, CSTRING, INTERNAL, INTEGER)
IS 'internal conversion function for EUC_JIS_2004 to SHIFT_JIS_2004';

initdb is called like this:
initdb -D <data-dir> -L <input-dir> -E UTF8 --locale=C

This is Postgres 8.4.4, the installation piece has been stable and always worked, but this time they have a new Red Hat 5.10 server

# uname -a
Linux <hostname> 2.6.18-371.el5 #1 SMP Thu Sep 5 21:21:44 EDT 2013 x86_64 x86_64 x86_64 GNU/Linux

# cat /etc/redhat-release
Red Hat Enterprise Linux Server release 5.10 (Tikanga)

I am not sure if this is helpful, but just in case:
# ldd euc_jis_2004_and_shift_jis_2004.so
linux-vdso.so.1 => (0x00007fff259fd000)
libc.so.6 => /lib64/libc.so.6 (0x00002b3d5a756000)
/lib64/ld-linux-x86-64.so.2 (0x0000003848400000)

And these libs are softlinks:
/lib64/libc.so.6 -> libc-2.5.so
/lib64/ld-linux-x86-64.so.2 -> ld-2.5.so

The only thought I have at this point is to run it with strace, but maybe this is a known issue and someone has a better idea?

Thank you,
Michael.

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