[issue676] SB600 HDA audio (Realtek ALC883) glitch - IRQ sharing?

["Joe \"Floid\" Kanowitz" <bugs@xxxxxxxxxxxxxxxxxxxxxxx>]

Joe "Floid" Kanowitz <jkanowitz@snet.net> added the comment:

Looks like a kernel without APIC_IO shows up a new problem; I didn't realize
panics would ever record in the dmesg file at all, but most of this one did:

[All fine until...]
usb0.ohci0.pci0.pcib0.legacypci0.nexus0.root0
usb0: <OHCI (generic) USB controller> [tentative] on ohci0
usb0: USB revision 1.0
uhub0: 2 ports with 2 removable, self powered

Fatal trap 12: page fault while in kernel mode
mp_lock = 00000000; cpuid = 0; lapic.id = 00000000
fault virtual address   = 0x0
fault code              = supervisor write, page not present
instruction pointer     = 0x8:0xc0489f4c
stack pointer           = 0x10:0xc3c10d34
frame pointer           = 0x10:0xc3c10d44
code segment            = base 0x0, limit 0xfffff, type 0x1b
                        = DPL 0, pres 1, def32 1, gran 1
processor eflags        = interrupt enabled, resume, IOPL = 0
current process         = Idle
current thread          = pri 46 (CRIT)
 <- SMP: XXX

It stopped in usb_add_task(), apparently.

Full dmesg to that point will be attached to #676.

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