igb hang when cable unplugged

[Daniel Kalchev]

I am observing an transmit hang of the igb driver when the cable is unplugged. It only recovers after unit reset, such as

ifconfig igb0 down up

This is with kernel

FreeBSD xxx 8.2-STABLE FreeBSD 8.2-STABLE #0: Fri Sep 30 16:17:47 EEST 2011     root at xxx:/usr/obj/usr/src/sys/GENERIC  amd64

igb0: <Intel(R) PRO/1000 Network Connection version - 2.2.3> port 0x3020-0x303f mem 0xb1d60000-0xb1d7ffff,0xb1d40000-0xb1d5ffff,0xb1e04000-0xb1e07fff irq 37 at device 0.0 on pci13
igb0: Using MSIX interrupts with 9 vectors
igb0: [ITHREAD]
igb0: [ITHREAD]
igb0: [ITHREAD]
igb0: [ITHREAD]
igb0: [ITHREAD]
igb0: [ITHREAD]
igb0: [ITHREAD]
igb0: [ITHREAD]
igb0: [ITHREAD]
igb0: Ethernet address: 00:25:90:36:ee:7c

The interface is quad port Supermicro branded PCI-E card with 

pciconf -vl

igb0 at pci0:13:0:0:       class=0x020000 card=0x10c915d9 chip=0x10c98086 rev=0x01 hdr=0x00
    vendor     = 'Intel Corporation'
    class      = network
    subclass   = ethernet
igb1 at pci0:13:0:1:       class=0x020000 card=0x10c915d9 chip=0x10c98086 rev=0x01 hdr=0x00
    vendor     = 'Intel Corporation'
    class      = network
    subclass   = ethernet
igb2 at pci0:16:0:0:       class=0x020000 card=0x10c915d9 chip=0x10c98086 rev=0x01 hdr=0x00
    vendor     = 'Intel Corporation'
    class      = network
    subclass   = ethernet
igb3 at pci0:16:0:1:       class=0x020000 card=0x10c915d9 chip=0x10c98086 rev=0x01 hdr=0x00
    vendor     = 'Intel Corporation'
    class      = network
    subclass   = ethernet


Has anyone experience something like this? Is there solution? It is very inconvenient to have to down/up the interfaces manually via the IPMI console when such thing happens.

Daniel