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[Xen-bugs] [Bug 59] Hypervisor enters infinite loop at boot with "(XEN)

To: xen-bugs@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-bugs] [Bug 59] Hypervisor enters infinite loop at boot with "(XEN) APIC error on CPU0: 02(02)"
From: bugzilla-daemon@xxxxxxxxxxxxxxxxxxx
Date: Thu, 26 May 2005 20:55:56 +0000
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kaf24@xxxxxxxxxxxx changed:

           What    |Removed                     |Added
             Status|NEW                         |ASSIGNED

------- Additional Comments From kaf24@xxxxxxxxxxxx  2005-05-26 20:55 -------
My guess is that this is a hardware issue. Xen likes to use the CPU's local 
APIC, but uniprocessor boards 
tend to leave the APIC disabled by default and may not be tested with it 
enabled. The error you are 
seeing is a 'receive checksum error': that is, the APIC is receiving garbage on 
the external 3-wire APIC 
bus. This is probably because of something stupid, like those processor pins 
not being properly tied to 

It would be interesting to find out whether you can induce native Linux to 
suffer the same error. To find 
out, build yourself a uniprocessor (non-SMP) native Linux kernel, with the 
following configuration 
option selected: Processor type and features -> Local APIC support on 

Xen is able to run with no local APIC (this was required to be able to run on 
VMware) -- if you need it 
then I can add in a command-line option that will allow you to forcibly disable 
the local APIC.

Please let me know how you get on!

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