interrupt routing

On  5.2-RC FreeBSD 5.2-RC #2: Thu Dec 11 19:52:34 GMT 2003 
(cvsupped a few hours before) I seem to get interrupt routing
problem where interrupts that belong to the gigabit ethernet
interfaces get also delivered to uhci1;
There is nothing connected to the USB connectors.
Advice how to debug further appreciated. As a workaround I´m just
dropping usb support from the kernel.

    0    32     0  18 -64  0     0   12 -      RL    ??    4:25.53  
(irq19: uhci1)
    0    41     0   0 -68  0     0   12 -      WL    ??    0:02.27  
(irq28: em0)
    0    42     0 129 -68  0     0   12 -      RL    ??   20:29.17  
(irq29: em1)
    0    85     0 126 -68  0     0   12 -      RL    ??   20:50.71  
(irq72: em2)

em0: <Intel(R) PRO/1000 Network Connection, Version - 1.7.19> port 
0x3000-0x303f mem 0xfc200000-0x
fc21ffff irq 28 at device 2.0 on pci3
em0:  Speed:N/A  Duplex:N/A
em1: <Intel(R) PRO/1000 Network Connection, Version - 1.7.19> port 
0x3040-0x307f mem 0xfc220000-0x
fc23ffff irq 29 at device 2.1 on pci3
em1:  Speed:N/A  Duplex:N/A
pcib4: <ACPI PCI-PCI bridge> at device 4.0 on pci0
pcib4: could not get PCI interrupt routing table for \\_SB_.PCI0.HLD_ - 
AE_NOT_FOUND
pci4: <ACPI PCI bus> on pcib4
pci4: <base peripheral, interrupt controller> at device 28.0 (no driver 
attached)
pcib5: <ACPI PCI-PCI bridge> at device 29.0 on pci4
pci5: <ACPI PCI bus> on pcib5
pci4: <base peripheral, interrupt controller> at device 30.0 (no driver 
attached)
pcib6: <ACPI PCI-PCI bridge> at device 31.0 on pci4
pci6: <ACPI PCI bus> on pcib6
em2: <Intel(R) PRO/1000 Network Connection, Version - 1.7.19> port 
0x4000-0x403f mem 0xfc400000-0x
fc41ffff irq 72 at device 1.0 on pci6
em2:  Speed:N/A  Duplex:N/A
em3: <Intel(R) PRO/1000 Network Connection, Version - 1.7.19> port 
0x4040-0x407f mem 0xfc420000-0x
fc43ffff irq 73 at device 1.1 on pci6
em3:  Speed:N/A  Duplex:N/A
uhci0: <Intel 82801CA/CAM (ICH3) USB controller USB-A> port 
0x2000-0x201f irq 16 at device 29.0 on pci0
usb0: <Intel 82801CA/CAM (ICH3) USB controller USB-A> on uhci0
usb0: USB revision 1.0
uhub0: Intel UHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub0: 2 ports with 2 removable, self powered
uhci1: <Intel 82801CA/CAM (ICH3) USB controller USB-B> port 
0x2020-0x203f irq 19 at device 29.1 on pci0
usb1: <Intel 82801CA/CAM (ICH3) USB controller USB-B> on uhci1
usb1: USB revision 1.0
uhub1: Intel UHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub1: 2 ports with 2 removable, self powered

Pete