Hi,

Kernel 2.4.21 gives the message:

An unexpected IO-APIC was found. If this kernel release is less than
three months old please report this to linux-smp@vger.kernel.org

The "dmesg" log is attached.
Also the "dmesg" log of the same system booting RH9 is attached; this
one does not give this message.

For reference:
The system is "Medion", with MSI motherboard and SiS chipset, P4 2.66GHz.

Hope this is useful, regards,
Klaas de Waal