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[Eric Carlier <1457863@xxxxxxxxxxxxxxxxxx>]

The bug is not reproducible anymore, although no linux-* package was
upgraded, and nothing kernel-related was changed on my machine.

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https://bugs.launchpad.net/bugs/1457863

Title:
  interface eth0 disappears after network cable unplug/re-plug

Status in linux package in Ubuntu:
  Triaged

Bug description:
  The following bug is reproducible with linux-image-3.13.0-53-generic,
  but not with linux-image-3.13.0-52-generic.

  When I unplug the Ethernet cable from my laptop, I get the following messages in /var/log/kern.log after a few seconds (~20s):
  May 22 13:59:36 host kernel: [ 5498.465626] pciehp 0000:00:1c.5:pcie04: Card not present on Slot(5)
  May 22 13:59:36 host kernel: [ 5498.478755] pciehp 0000:00:1c.5:pcie04: Card present on Slot(5)
  May 22 13:59:36 host kernel: [ 5498.598744] pciehp 0000:00:1c.5:pcie04: Device 0000:06:00.0 already exists at 0000:06:00, cannot hot-add
  May 22 13:59:36 host kernel: [ 5498.598755] pciehp 0000:00:1c.5:pcie04: Cannot add device at 0000:06:00
  May 22 13:59:36 host kernel: [ 5498.718646] atl1c 0000:06:00.0: MAC state machine can't be idle since disabled for 10ms second

  Then, when I re-plug the cable, eth0 does not appear in network manager; there is no message in kern.log.
  eth0 does not appear in ifconfig -a

  $ ifconfig -a
  lo        Link encap:Local Loopback  
            inet addr:127.0.0.1  Mask:255.0.0.0
            inet6 addr: ::1/128 Scope:Host
            UP LOOPBACK RUNNING  MTU:65536  Metric:1
            RX packets:11586 errors:0 dropped:0 overruns:0 frame:0                                                                                                        
            TX packets:11586 errors:0 dropped:0 overruns:0 carrier:0                                                                                                      
            collisions:0 txqueuelen:0                                                                                                                                     
            RX bytes:16392353 (16.3 MB)  TX bytes:16392353 (16.3 MB)                                                                                                      

  wlan0     Link encap:Ethernet  HWaddr 48:5d:xx:xx:xx:xx  
            inet addr:192.168.xx.xx  Bcast:192.168.xx.xx  Mask:255.255.255.0
            inet6 addr: fe80::xxxx:xxxx:xxxx:xxxx/64 Scope:Link
            UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
            RX packets:19 errors:0 dropped:0 overruns:0 frame:0
            TX packets:66 errors:0 dropped:0 overruns:0 carrier:0
            collisions:0 txqueuelen:1000 
            RX bytes:2651 (2.6 KB)  TX bytes:12364 (12.3 KB)

  I tried to reinitialize networking with the following:
  sudo modprobe -r atl1c
  sudo modprobe atl1c

  Still no eth0 and no message in kern.log

  I tried
  $ sudo ifup eth0
  Ignoring unknown interface eth0=eth0.

  Same symptoms occur when I reboot my router, and its Ethernet
  interface becomes temporarily unavailable.

  Only way I found to restore eth0 was rebooting.
  --- 
  ApportVersion: 2.14.1-0ubuntu3.11
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  chewy      3002 F.... pulseaudio
   /dev/snd/controlC0:  chewy      3002 F.... pulseaudio
  CurrentDesktop: KDE
  DistroRelease: Ubuntu 14.04
  EcryptfsInUse: Yes
  HibernationDevice: RESUME=UUID=17ba1751-f706-417b-ac40-1b4a7be825d8
  InstallationDate: Installed on 2012-12-29 (873 days ago)
  InstallationMedia: Kubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120423)
  MachineType: ASUSTeK Computer Inc. N53Jq
  NonfreeKernelModules: nvidia
  Package: linux (not installed)
  ProcFB: 0 VESA VGA
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-53-generic root=UUID=d48490d1-ca6a-448d-82e6-6397021cd403 ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 3.13.0-53.89-generic 3.13.11-ckt19
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-53-generic N/A
   linux-backports-modules-3.13.0-53-generic  N/A
   linux-firmware                             1.127.12
  Tags:  trusty
  Uname: Linux 3.13.0-53-generic x86_64
  UpgradeStatus: Upgraded to trusty on 2014-09-05 (259 days ago)
  UserGroups: adm admin cdrom dialout disk fuse lpadmin mediatomb plugdev sambashare vboxusers wireshark
  _MarkForUpload: True
  dmi.bios.date: 01/25/2011
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: N53Jq.211
  dmi.board.asset.tag: ATN12345678901234567
  dmi.board.name: N53Jq
  dmi.board.vendor: ASUSTeK Computer Inc.
  dmi.board.version: 1.0
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: ASUSTeK Computer Inc.
  dmi.chassis.version: 1.0
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrN53Jq.211:bd01/25/2011:svnASUSTeKComputerInc.:pnN53Jq:pvr1.0:rvnASUSTeKComputerInc.:rnN53Jq:rvr1.0:cvnASUSTeKComputerInc.:ct10:cvr1.0:
  dmi.product.name: N53Jq
  dmi.product.version: 1.0
  dmi.sys.vendor: ASUSTeK Computer Inc.

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