I found this in the syslog after rebooting when my server machine decided to stop responding.
Sep 23 05:57:42 eridanos kernel: [48109.953768] ------------[ cut here ]------------
Sep 23 05:57:42 eridanos kernel: [48109.953790] WARNING: at /build/buildd/linux-2.6.32/net/sched/sch_generic.c:261 dev_watchdog+0x262/0x270()
Sep 23 05:57:42 eridanos kernel: [48109.953796] Hardware name: Sun Fire X2200 M2
Sep 23 05:57:42 eridanos kernel: [48109.953801] NETDEV WATCHDOG: eth0 (tg3): transmit queue 0 timed out
Sep 23 05:57:42 eridanos kernel: [48109.953805] Modules linked in: ipt_MASQUERADE iptable_nat nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_state nf_conntrack ipt_REJECT xt_tcpudp iptable_filter ip_tables x_tab
les kvm_amd kvm bridge stp fbcon tileblit font bitblit softcursor vga16fb vgastate i2c_nforce2 psmouse k8temp amd64_edac_mod lp edac_core serio_raw edac_mce_amd shpchp parport usbhid hid dm_raid45 xor tg3 sa
ta_nv forcedeth pata_amd
Sep 23 05:57:42 eridanos kernel: [48109.953868] Pid: 0, comm: swapper Not tainted 2.6.32-24-server #43-Ubuntu
Sep 23 05:57:42 eridanos kernel: [48109.953873] Call Trace:
Sep 23 05:57:42 eridanos kernel: [48109.953877] <IRQ> [<ffffffff81066dcb>] warn_slowpath_common+0x7b/0xc0
Sep 23 05:57:42 eridanos kernel: [48109.953897] [<ffffffff81066e71>] warn_slowpath_fmt+0x41/0x50
Sep 23 05:57:42 eridanos kernel: [48109.953905] [<ffffffff8148d062>] dev_watchdog+0x262/0x270
Sep 23 05:57:42 eridanos kernel: [48109.953914] [<ffffffff8101a0f3>] ? native_sched_clock+0x13/0x60
Sep 23 05:57:42 eridanos kernel: [48109.953923] [<ffffffff8108b095>] ? sched_clock_local+0x25/0x90
Sep 23 05:57:42 eridanos kernel: [48109.953930] [<ffffffff8148ce00>] ? dev_watchdog+0x0/0x270
Sep 23 05:57:42 eridanos kernel: [48109.953938] [<ffffffff8107751b>] run_timer_softirq+0x19b/0x340
Sep 23 05:57:42 eridanos kernel: [48109.953947] [<ffffffff81094730>] ? tick_sched_timer+0x0/0xc0
Sep 23 05:57:42 eridanos kernel: [48109.953954] [<ffffffff8108f393>] ? ktime_get+0x63/0xe0
Sep 23 05:57:42 eridanos kernel: [48109.953961] [<ffffffff8106e317>] __do_softirq+0xb7/0x1e0
Sep 23 05:57:42 eridanos kernel: [48109.953968] [<ffffffff8109431a>] ? tick_program_event+0x2a/0x30
Sep 23 05:57:42 eridanos kernel: [48109.953975] [<ffffffff810142ec>] call_softirq+0x1c/0x30
Sep 23 05:57:42 eridanos kernel: [48109.953982] [<ffffffff81015cb5>] do_softirq+0x65/0xa0
Sep 23 05:57:42 eridanos kernel: [48109.953987] [<ffffffff8106e1b5>] irq_exit+0x85/0x90
Sep 23 05:57:42 eridanos kernel: [48109.953996] [<ffffffff8155fe11>] smp_apic_timer_interrupt+0x71/0x9c
Sep 23 05:57:42 eridanos kernel: [48109.954003] [<ffffffff81013cb3>] apic_timer_interrupt+0x13/0x20
Sep 23 05:57:42 eridanos kernel: [48109.954007] <EOI> [<ffffffff81038acb>] ? native_safe_halt+0xb/0x10
Sep 23 05:57:42 eridanos kernel: [48109.954021] [<ffffffff8155d906>] ? notifier_call_chain+0x16/0x80
Sep 23 05:57:42 eridanos kernel: [48109.954029] [<ffffffff8101b69d>] ? default_idle+0x3d/0x90
Sep 23 05:57:42 eridanos kernel: [48109.954036] [<ffffffff8101b753>] ? c1e_idle+0x63/0x120
Sep 23 05:57:42 eridanos kernel: [48109.954045] [<ffffffff81011e63>] ? cpu_idle+0xb3/0x110
Sep 23 05:57:42 eridanos kernel: [48109.954052] [<ffffffff81552b33>] ? start_secondary+0xa8/0xaa
Sep 23 05:57:42 eridanos kernel: [48109.954058] ---[ end trace e0e54656d9b5de0f ]---
Sep 23 05:57:42 eridanos kernel: [48109.954063] tg3: eth0: transmit timed out, resetting
Sep 23 05:57:42 eridanos kernel: [48109.954498] tg3: DEBUG: MAC_TX_STATUS[0000000b] MAC_RX_STATUS[00000000]
Sep 23 05:57:42 eridanos kernel: [48109.955003] tg3: DEBUG: RDMAC_STATUS[00000000] WDMAC_STATUS[00000000]
Sep 23 05:57:42 eridanos kernel: [48109.970934] tg3: eth0: Link is down.
ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: linux-image-2.6.32-24-server 2.6.32-24.43
Regression: Yes
Reproducible: No
ProcVersionSignature: Ubuntu 2.6.32-24.43-server 2.6.32.15+drm33.5
Uname: Linux 2.6.32-24-server x86_64
AlsaDevices: Error: command ['ls', '-l', '/dev/snd/'] failed with exit code 2: ls: cannot access /dev/snd/: No such file or directory
AplayDevices: Error: [Errno 2] No such file or directory
Architecture: amd64
ArecordDevices: Error: [Errno 2] No such file or directory
Date: Thu Sep 23 11:28:28 2010
Frequency: This has only happened once.
Lsusb:
Bus 002 Device 004: ID 046d:c303 Logitech, Inc. iTouch Keyboard
Bus 002 Device 003: ID 046d:0b01 Logitech, Inc.
Bus 002 Device 002: ID 0b38:0003
Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: Sun Microsystems Sun Fire X2200 M2
PciMultimedia:
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.32-24-server root=UUID=b0902430-dfc3-4190-b281-f613f531252d ro quiet splash hpet=force
ProcEnviron:
LANG=en_AU.UTF-8
SHELL=/bin/bash
SourcePackage: linux
dmi.bios.date: 02/04/2009
dmi.bios.vendor: Sun Microsystems
dmi.bios.version: S39_3B27
dmi.board.asset.tag: To Be Filled By O.E.M.
dmi.board.name: S39
dmi.board.vendor: Sun Microsystems
dmi.board.version: Rev 50
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 23
dmi.chassis.vendor: Sun Microsystems
dmi.chassis.version: Rev 50
dmi.modalias: dmi:bvnSunMicrosystems:bvrS39_3B27:bd02/04/2009:svnSunMicrosystems:pnSunFireX2200M2:pvrRev50:rvnSunMicrosystems:rnS39:rvrRev50:cvnSunMicrosystems:ct23:cvrRev50:
dmi.product.name: Sun Fire X2200 M2
dmi.product.version: Rev 50
dmi.sys.vendor: Sun Microsystems
Possibly related to 404708.