network-manager unstable, system freezes when disconnected from wire connection

[ubuntugaga]

The systems freezes whenever I unplug the wire cable. Wireless seems to be connecting OK.
If the wire is not connected, the system is also unable to properly launch (doesn't even get Login page) or shutdown.

Here's the syslog when I unplug the cable:
May 29 21:57:16 yushan kernel: [ 2453.391125] atl1c 0000:07:00.0: atl1c: eth0 NIC Link is Down
May 29 21:57:16 yushan NetworkManager[680]: <info> (eth0): carrier now OFF (device state 100, deferring action for 4 seconds)
May 29 21:57:21 yushan NetworkManager[680]: <info> (eth0): device state change: activated -> unavailable (reason 'carrier-changed') [100 20 40]
May 29 21:57:21 yushan NetworkManager[680]: <info> (eth0): deactivating device (reason 'carrier-changed') [40]
May 29 21:57:21 yushan NetworkManager[680]: <info> (eth0): canceled DHCP transaction, DHCP client pid 3266
May 29 21:57:21 yushan kernel: [ 2458.289657] ADDRCONF(NETDEV_UP): eth0: link is not ready
May 29 21:57:21 yushan avahi-daemon[692]: Withdrawing address record for fe80::e269:95ff:fee6:61f1 on eth0.
May 29 21:57:21 yushan avahi-daemon[692]: Leaving mDNS multicast group on interface eth0.IPv6 with address fe80::e269:95ff:fee6:61f1.
May 29 21:57:21 yushan avahi-daemon[692]: Interface eth0.IPv6 no longer relevant for mDNS.
May 29 21:57:21 yushan avahi-daemon[692]: Withdrawing address record for 192.168.1.69 on eth0.
May 29 21:57:21 yushan avahi-daemon[692]: Leaving mDNS multicast group on interface eth0.IPv4 with address 192.168.1.69.
May 29 21:57:21 yushan avahi-daemon[692]: Interface eth0.IPv4 no longer relevant for mDNS.
May 29 21:57:21 yushan dnsmasq[3276]: exiting on receipt of SIGTERM
May 29 21:57:21 yushan NetworkManager[680]: <info> DNS: starting dnsmasq...
May 29 21:57:21 yushan NetworkManager[680]: <info> (eth0): writing resolv.conf to /sbin/resolvconf
May 29 21:57:21 yushan dnsmasq[3326]: started, version 2.59 cache disabled
May 29 21:57:21 yushan dnsmasq[3326]: compile time options: IPv6 GNU-getopt DBus i18n DHCP TFTP conntrack IDN
May 29 21:57:21 yushan dnsmasq[3326]: using nameserver 192.168.1.1#53
May 29 21:57:21 yushan NetworkManager[680]: <info> Policy set 'Doraemon' (wlan0) as default for IPv4 routing and DNS.
May 29 21:57:21 yushan NetworkManager[680]: <info> Policy set 'Doraemon' (wlan0) as default for IPv4 routing and DNS.
May 29 21:57:21 yushan dbus[627]: [system] Activating service name='org.freedesktop.nm_dispatcher' (using servicehelper)
May 29 21:57:21 yushan dbus[627]: [system] Successfully activated service 'org.freedesktop.nm_dispatcher'

Infor about my network cards:
06:00.0 Network controller: Atheros Communications Inc. AR9285 Wireless Network Adapter (PCI-Express) (rev 01)
07:00.0 Ethernet controller: Atheros Communications Inc. AR8152 v2.0 Fast Ethernet (rev c1)

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: network-manager 0.9.4.0-0ubuntu4
ProcVersionSignature: Ubuntu 3.2.0-24.39-generic 3.2.16
Uname: Linux 3.2.0-24-generic x86_64
ApportVersion: 2.0.1-0ubuntu7
Architecture: amd64
CRDA: Error: [Errno 2] No such file or directory
Date: Tue May 29 22:55:36 2012
EcryptfsInUse: Yes
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
IpRoute:
 default via 192.168.1.1 dev eth0 proto static
 169.254.0.0/16 dev eth0 scope link metric 1000
 192.168.1.0/24 dev eth0 proto kernel scope link src 192.168.1.69 metric 1
 192.168.1.0/24 dev wlan0 proto kernel scope link src 192.168.1.81 metric 2
NetworkManager.state:
 [main]
 NetworkingEnabled=true
 WirelessEnabled=true
 WWANEnabled=true
 WimaxEnabled=true
ProcEnviron:
 LANGUAGE=en_US:en
 TERM=xterm
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: network-manager
UpgradeStatus: No upgrade log present (probably fresh install)
nmcli-con:
 NAME UUID TYPE TIMESTAMP TIMESTAMP-REAL AUTOCONNECT READONLY DBUS-PATH
 Wired connection 1 e0456485-8365-4f6c-b6d0-a85b2a8931fc 802-3-ethernet 1338324852 Tue 29 May 2012 10:54:12 PM CEST yes no /org/freedesktop/NetworkManager/Settings/1
 Doraemon 14cbdf64-ec36-43c4-a141-7368608673f8 802-11-wireless 1338324852 Tue 29 May 2012 10:54:12 PM CEST yes no /org/freedesktop/NetworkManager/Settings/0
nmcli-dev:
 DEVICE TYPE STATE DBUS-PATH
 wlan0 802-11-wireless connected /org/freedesktop/NetworkManager/Devices/1
 eth0 802-3-ethernet connected /org/freedesktop/NetworkManager/Devices/0
nmcli-nm:
 RUNNING VERSION STATE NET-ENABLED WIFI-HARDWARE WIFI WWAN-HARDWARE WWAN
 running 0.9.4.0 connected enabled enabled enabled enabled disabled

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[ubuntugaga (ubuntugaga)]

Temporary solution found by doing "rmmod atl1c" as suggested, http://askubuntu.com/questions/147425/ubuntu-12-04-system-freezing-when-not-connected-to-lan

[ubuntugaga (ubuntugaga)]

Actually, to be more precise about the temporary solution, the answer to this forum question will be better: http://askubuntu.com/questions/105607/ubuntu-11-10-and-atheros-ar8131-ethernet-card

[Bráulio (brauliobo)]

the problem still happens with atl1c version 1.0.1.1 and ubuntu, kernel 3.8.0-23 and ubuntu 13.04.

the hangs here also happens with usb when the wired network is being used.

I (think) I don't use NFS.

[ 317.551669] atl1c 0000:01:00.0: atl1c: eth0 NIC Link is Down
[ 319.070364] atl1c 0000:01:00.0: atl1c: eth0 NIC Link is Up<100 Mbps Full Duplex>
[ 342.527902] usb 1-1: USB disconnect, device number 3
[ 522.335865] atl1c 0000:01:00.0: atl1c: eth0 NIC Link is Down
[ 523.866725] atl1c 0000:01:00.0: atl1c: eth0 NIC Link is Up<100 Mbps Full Duplex>
[ 538.748071] usb 1-1: new high-speed USB device number 4 using ehci-pci
[ 538.893189] usb 1-1: New USB device found, idVendor=0bb4, idProduct=0c96
[ 538.893202] usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 538.893210] usb 1-1: Product: myTouch 4G
[ 538.893217] usb 1-1: Manufacturer: T-Mobile
[ 538.893223] usb 1-1: SerialNumber: SH11WT600957
[ 538.896623] scsi5 : usb-storage 1-1:1.0
[ 539.898326] scsi 5:0:0:0: Direct-Access T-Mobile myTouch 4G 0100 PQ: 0 ANSI: 2
[ 539.900769] sd 5:0:0:0: Attached scsi generic sg1 type 0
[ 539.913593] sd 5:0:0:0: [sdb] Attached SCSI removable disk