Server reboots when silo overflows - FreeBSD 4.11

[Lefteris Tsintjelis]

> >sio5: 1 more silo overflow (total 7)
> >puc0: <VScom PCI-200L> port
> >0xb000-0xb007,0xb400-0xb407,0xb800-0xb807,0xd000-0xd007 mem
> >0xea800000-0xea80003f irq 14 at device 12.0 on pci2
> >sio4: configured irq 14 not in bitmap of probed irqs 0x8000
> >sio4: type 16550A
> >sio5: configured irq 14 not in bitmap of probed irqs 0x8000
> >sio5: type 16550A
> 
> How do you have device sio configured in your kernel ?  Are you trying to
> specify the ports for the puc attached serial ports ?  All you need is
> 
> device          sio
> device          puc

device          sio0    at isa? port IO_COM1 flags 0x10 irq 4
device          sio1    at isa? port IO_COM2 irq 3
device          sio2    at isa? disable port IO_COM3 irq 5
device          sio3    at isa? disable port IO_COM4 irq 9

device          puc

No other sio specific devices for puc other than the kernel's default.
The sio0/1 never gave me any trouble though. Its the sio4/5 (puc)
that fail me. BTW this bug is old and run to it again about a year ago.

> Also, enable crash dumps and build a debug kernel.

I enabled the debug symbols already and I have a few crash dumps.
What can do I do next?