bnx(4) lockups?

[Stephen Borrill <netbsd%precedence.co.uk@localhost>]

I have a reliable installation on one Lenovo server which has wm(4) NICs. 
It has connections to the LAN and directly to the open Internet. I tried 
to migrate it to a different server which has bnx(4) NICs. If not 
connected to the Internet, it runs reliably. If connected to the Internet 
and traffic is flowing, it will lock solid after a while. I have 
encountered this previously and tracked it down to IPFilter. My workaround 
on that occasion was to use "pass in all/pass out all" rules (I could not 
disable IPFilter as I needed NAT) as anything more complex caused the 
lock. However, on this occasion I switched to NPF and the lockups 
continue. This is on netbsd-7.

The hardware has been running XenServer solidly under 
heavy load for a number of years. Doing internal data copies (to stress 
the HDDs and RAID controller) is also reliable.

I really can't think of much else besides the network hardware (and I 
don't have any spare NICs to hand). Is bnx(4) known bad?

bnx0 at pci1 dev 0 function 0: Broadcom NetXtreme II BCM5709 1000Base-T
bnx0: Ethernet address 5c:f3:fc:e4:e6:78
bnx0: interrupting at ioapic1 pin 4
bnx0: ASIC BCM5709 C0 (0x57092003)
bnx0: PCIe x2 5Gbps
bnx0: Coal (RX:6,6,18,18; TX:20,20,80,80)
bnx1 at pci1 dev 0 function 1: Broadcom NetXtreme II BCM5709 1000Base-T
bnx1: Ethernet address 5c:f3:fc:e4:e6:7a
bnx1: interrupting at ioapic1 pin 16
bnx1: ASIC BCM5709 C0 (0x57092003)
bnx1: PCIe x2 5Gbps
bnx1: Coal (RX:6,6,18,18; TX:20,20,80,80)
bnx2 at pci2 dev 0 function 0: Broadcom NetXtreme II BCM5709 1000Base-T
bnx2: Ethernet address 5c:f3:fc:6b:c6:b4
bnx2: interrupting at ioapic1 pin 5
bnx2: ASIC BCM5709 C0 (0x57092003)
bnx2: PCIe x2 5Gbps
bnx2: Coal (RX:6,6,18,18; TX:20,20,80,80)
bnx3 at pci2 dev 0 function 1: Broadcom NetXtreme II BCM5709 1000Base-T
bnx3: Ethernet address 5c:f3:fc:6b:c6:b6
bnx3: interrupting at ioapic1 pin 17
bnx3: ASIC BCM5709 C0 (0x57092003)
bnx3: PCIe x2 5Gbps
bnx3: Coal (RX:6,6,18,18; TX:20,20,80,80)

--
Stephen