The UP x86 kernel used for a while has been panic'ing on boot on my 2x3.4 ghz em64t box. The x86_64 kernel (which is smp) boots fine. Backtrace with 2.6.13-1.1624_FC5 kernel BUG at arch/i386/kernel/apic.c:430! Call trace: init APIC_init_uniprocessor init init kernel_thread_helper panic do_exit do_divide_error do_invalid_op do_invalid_op setup_local_APIC complete kthread_create watchdog error_code init init setup_local_APIC init APIC_init_uniprocessor init init kernel_thread_helper
My other dual box (2x2.8 ghz p4 xen, compaq presario) boots fine. This is on a HP xw8200. Booting with 'linux apic' gets further, but then just hangs after probing the IDE devices.
Could you try 'linux lapic apic' to enable the local APIC and IO APIC on the xw8200? My x445 throws up "hda: Interrupt timeout" messages if I only enable the IOAPICs but it boots fine if both are passed. Also, I've submitted a patch (see RH 167333) that should keep the local APIC off except when expressly asked for with 'lapic'. Hopefully this problem you're seeing will go away when that patch goes into rawhide.
That does make things work... adding bug dep
that patch has been in rawhide for a few days now. Does the latest tree work ?
Works with today's rawhide at least