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ACPI issue in netbsd-5, fixed in HEAD

on a server running netbsd-5, access to the second serial port
(com2 in bios, com1 for NetBSD) leads to an interrupt storm on ioapic0 pin 9,
used for the ACPI callback. This immediatly freeze the kernel on Xen,
and freeze a amd64 GENERIC kernel a few seconds later.
This doesn't happends with a -current kernel (both native and Xen).

Any idea of what fixed it in -HEAD, and if it can be pulled up to netbsd-5 ?

Manuel Bouyer <>
     NetBSD: 26 ans d'experience feront toujours la difference

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