NETDEV WATCHDOG: eth0 (pcnet_cs): transmit queue 0 timed out

haven't any

ProblemType: KernelOops
DistroRelease: Ubuntu 11.04
Package: linux-image-2.6.38-7-generic 2.6.38-7.39
Regression: Yes
Reproducible: No
ProcVersionSignature: Ubuntu 2.6.38-7.39-generic 2.6.38
Uname: Linux 2.6.38-7-generic i686
AlsaDevices:
 total 0
 crw------- 1 root root 116, 1 2011-03-31 09:09 seq
 crw------- 1 root root 116, 33 2011-03-31 09:09 timer
Annotation: Your system might become unstable now and might need to be restarted.
AplayDevices: aplay: device_list:240: no soundcards found...
Architecture: i386
ArecordDevices: arecord: device_list:240: no soundcards found...
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
CRDA: Error: [Errno 2] Datei oder Verzeichnis nicht gefunden
Date: Wed Mar 30 16:58:08 2011
Failure: oops
Frequency: I don't know.
HibernationDevice: RESUME=/dev/sda5
InstallationMedia: Xubuntu 11.04 "Natty Narwhal" - Alpha i386 (20110301.2)
IwConfig:
 lo no wireless extensions.

 eth0 no wireless extensions.
Lsusb:
 Bus 001 Device 002: ID 413c:3012 Dell Computer Corp. Optical Wheel Mouse
 Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
PccardctlStatus:
 Socket 0:
   5.0V 16-bit PC Card
   Subdevice 0 (function 0) bound to driver "pcnet_cs"
 Socket 1:
   no card
PciMultimedia:

ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.38-7-generic root=UUID=ad4ffbf3-6349-4472-8ab4-acd5bfac1e75 ro quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-2.6.38-7-generic N/A
 linux-backports-modules-2.6.38-7-generic N/A
 linux-firmware 1.49
RfKill:

SourcePackage: linux
Title: NETDEV WATCHDOG: eth0 (pcnet_cs): transmit queue 0 timed out
UpgradeStatus: Upgraded to natty on 2011-03-23 (7 days ago)