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[Bug 1305406] Re: [8086:4238] iwlwifi: fail to flush all tx fifo queues Q 0


I have tested the latest upstream kernel even more, and I have noticed
something that may or may not help.  I have found a "degradation effect"
in which the total length of time the connection is hung within a given
time frame increases the longer the system is running.  To illustrate
this effect, here are time frames from a sample system run in which I
saw the aforementioned messages in the system log:

130.027554-277.358228 seconds since startup (147.330674 seconds long)
279.384357-299.437885 seconds since startup (20.053528 seconds long)
51257.090718-51261.102655 seconds since startup (4.011937 seconds long)
51575.931991-51579.948176 seconds since startup (4.016185 seconds long)
53066.713218-53099.649674 seconds since startup (32.936456 seconds long)
68674.880550-68738.963402 seconds since startup (64.082852 seconds long)
83473.503976-83619.708034 seconds since startup (146.204058 seconds long)
84739.202166-84739.204135 seconds since startup (0.001969 of a second long)
87142.062085-87198.136332 seconds since startup (56.074247 seconds long)
. . .

Suppose we group these time frames into 40,000 second time intervals.
Between 0 and 40,000 seconds since startup, there are 56.074247 seconds
worth of these messages.  Between 40,000 and 80,000 seconds since
startup, there are 105.04743 seconds worth of these messages.  Between
80,000 and 120,000 seconds since startup, there are at least 202.280274
seconds worth of these messages.

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  [8086:4238] iwlwifi: fail to flush all tx fifo queues Q 0

Status in “linux” package in Ubuntu:

Bug description:
  I have a Lenovo ThinkPad X201 Tablet with an Intel Centrino Ultimate-N
  6300 AGN wireless card.  Ever since I have upgraded to Ubuntu 13.10
  from Ubuntu 12.10, I keep experiencing this annoying issue on wireless
  networks with multiple APs:  a TX queue gets stuck, and the wireless
  card cannot send any packets.  The Wi-Fi LED constantly flashes, and
  sometimes, it becomes nearly impossible to restart the wireless card
  using Fn+F5.

  The NetworkManager connection is setup as follows:

  SSID:  IllinoisNet
  BSSID:  DA:BE:76:xx:xx:xx
  Security:  WPA/WPA2 Enterprise
  Authentication:  Protected EAP (PEAP)
  CA Certificate:  /etc/ssl/certs/AddTrust_External_Root.pem
  PEAP Version:  Automatic
  Inner Authentication:  MSCHAPv2

  Notice that I have manually specified a BSSID to force the system to
  use only one AP (since I have not found a way to reduce the roaming
  aggressiveness on Intel wireless cards in Linux).

  Attached is the Wireshark log and the syslog output while TX queue 0
  is stuck.

  ProblemType: Bug
  DistroRelease: Ubuntu 13.10
  Package: linux-image-3.11.0-19-generic 3.11.0-19.33
  ProcVersionSignature: Ubuntu 3.11.0-19.33-generic
  Uname: Linux 3.11.0-19-generic x86_64
  ApportVersion: 2.12.5-0ubuntu2.2
  Architecture: amd64
   /dev/snd/controlC0:  ron        2599 F.... pulseaudio
  Date: Wed Apr  9 21:36:49 2014
  HibernationDevice: RESUME=UUID=70381092-dbb1-458c-8c5c-68850e61086c
  InstallationDate: Installed on 2013-02-28 (405 days ago)
  InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
  MachineType: LENOVO 0831CTO
  MarkForUpload: True
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.11.0-19-generic root=UUID=606d1eed-eeca-4acb-a739-6796a7f7432b ro quiet splash vt.handoff=7
   linux-restricted-modules-3.11.0-19-generic N/A
   linux-backports-modules-3.11.0-19-generic  N/A
   linux-firmware                             1.116.2
  SourcePackage: linux
  UpgradeStatus: Upgraded to saucy on 2014-01-22 (77 days ago)
  dmi.bios.date: 04/26/2012
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 6QET69WW (1.39 )
  dmi.board.name: 0831CTO
  dmi.board.vendor: LENOVO
  dmi.board.version: Not Available
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: dmi:bvnLENOVO:bvr6QET69WW(1.39):bd04/26/2012:svnLENOVO:pn0831CTO:pvrThinkPadX201Tablet:rvnLENOVO:rn0831CTO:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 0831CTO
  dmi.product.version: ThinkPad X201 Tablet
  dmi.sys.vendor: LENOVO

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