em0 watchdog timeouts on 8-STABLE

[Joshua Boyd]

I recently updated my server to the latest 8-STABLE, and upgraded to v28
ZFS. I have not had these problems on any other version of 8-STABLE or
7-STABLE, which this box was upgraded from some time ago.

Now, during my weekly scrub, I get the following messages and em0 is
unresponsive:

Jun 12 03:07:58 foghornleghorn kernel: em0: Watchdog timeout -- resetting
Jun 12 03:07:58 foghornleghorn kernel: em0: link state changed to DOWN
Jun 12 03:08:01 foghornleghorn kernel: em0: link state changed to UP
Jun 12 03:08:47 foghornleghorn kernel: em0: Watchdog timeout -- resetting
Jun 12 03:08:47 foghornleghorn kernel: em0: link state changed to DOWN
Jun 12 03:08:50 foghornleghorn kernel: em0: link state changed to UP

My scrub is scheduled to start at 03:00:00, so it looks like watchdog
timeouts start occurring pretty quickly once I/O ramps up.

Here's some possibly relevant information, let me know if anything else
would be helpful to troubleshoot.

FreeBSD foghornleghorn.res.openband.net 8.2-STABLE FreeBSD 8.2-STABLE #17:
Mon Jun  6 19:40:19 EDT 2011
root at foghornleghorn.res.openband.net:/usr/obj/usr/src/sys/FOGHORNLEGHORN
 amd64

em0: <Intel(R) PRO/1000 Legacy Network Connection 1.0.3> port 0xe800-0xe83f
mem 0xfebe0000-0xfebfffff,0xfebc0000-0xfebdffff irq 20 at device 5.0 on pci7

em0 at pci0:7:5:0: class=0x020000 card=0x13768086 chip=0x107c8086 rev=0x05
hdr=0x00
    vendor     = 'Intel Corporation'
    device     = 'Gigabit Ethernet Controller (Copper) rev 5 (82541PI)'
    class      = network
    subclass   = ethernet

And, the SAS cards:

dev.mpt.0.%desc: LSILogic SAS/SATA Adapter
dev.mpt.0.%driver: mpt
dev.mpt.0.%location: slot=0 function=0
dev.mpt.0.%pnpinfo: vendor=0x1000 device=0x0058 subvendor=0x15d9
subdevice=0xa580 class=0x010000
dev.mpt.0.%parent: pci1
dev.mpt.0.debug: 3
dev.mpt.0.role: 1
dev.mpt.1.%desc: LSILogic SAS/SATA Adapter
dev.mpt.1.%driver: mpt
dev.mpt.1.%location: slot=0 function=0
dev.mpt.1.%pnpinfo: vendor=0x1000 device=0x0058 subvendor=0x15d9
subdevice=0xa580 class=0x010000
dev.mpt.1.%parent: pci2
dev.mpt.1.debug: 3
dev.mpt.1.role: 1
dev.mpt.2.%desc: LSILogic SAS/SATA Adapter
dev.mpt.2.%driver: mpt
dev.mpt.2.%location: slot=0 function=0
dev.mpt.2.%pnpinfo: vendor=0x1000 device=0x0058 subvendor=0x1000
subdevice=0x30a0 class=0x010000
dev.mpt.2.%parent: pci6
dev.mpt.2.debug: 3
dev.mpt.2.role: 1


-- 
Joshua Boyd
JBipNet

E-mail: boydjd at jbip.net
Cell: (513) 375-0157

http://www.jbip.net