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[Sharath <sharathcshekhar@xxxxxxxxx>]

The problem was reproduced even in the mainline kernel. Attached is the dmesg output.
I faced another issue with running in the RC kernel. After the wifi crash and reboot cycle, I could never connect to wifi and my wireless card was not detected even after manually loading the drivers. The only way I could resolve this issue was to boot into windows and then boot into linux again (but I am not sure if it's the driver issue or my hardware). Is it possible that the faulty drivers modify some persistent state variables in the hardware which was causing this issue?

Thanks and regards,
Sharath


** Attachment added: "dmesg output for wifi crash 3.12-rc kernel"
   https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1226728/+attachment/3830687/+files/failed_wifi_dmesg_3.12rc.log

** Tags added: kernel-bug-exists-upstream

** Changed in: linux (Ubuntu)
       Status: Incomplete => Confirmed

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https://bugs.launchpad.net/bugs/1226728

Title:
  Wifi Driver crashes very ofter on kernel version 3.8.0-x, Dell XPS
  Laptop

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  After upgrade to Ubuntu 13.04, I have observed random Wifi Driver
  Crashes. The frequency I have observed is about once or twice a day
  (10 hrs or usage per day). No particular steps to reprroduce, but the
  just random crashes. The issue is seen in both patch 30 and 31 of the
  kernel version 3.8.0. Full dmesg logs are attached with the bug.

  The below is the stack trace from dmesg

  [  972.637382]  [<ffffffff810589bf>] warn_slowpath_common+0x7f/0xc0
  [  972.637389]  [<ffffffff81058abc>] warn_slowpath_fmt+0x4c/0x50
  [  972.637408]  [<ffffffffa01ea361>] ? iwl_grab_nic_access_silent+0xe1/0x120 [iwlwifi]
  [  972.637424]  [<ffffffffa01ea41e>] iwl_grab_nic_access+0x7e/0x90 [iwlwifi]
  [  972.637439]  [<ffffffffa01ea8d6>] iwl_write_prph+0x46/0xc0 [iwlwifi]
  [  972.637458]  [<ffffffffa01f300a>] iwl_pcie_tx_stop+0x4a/0x140 [iwlwifi]
  [  972.637476]  [<ffffffffa01f63cf>] iwl_trans_pcie_stop_device+0xcf/0x460 [iwlwifi]
  [  972.637492]  [<ffffffffa039f34d>] iwl_down+0x21d/0x320 [iwldvm]
  [  972.637508]  [<ffffffffa03a4775>] iwlagn_mac_stop+0x65/0xd0 [iwldvm]
  [  972.637546]  [<ffffffffa02ef561>] ieee80211_stop_device+0x51/0xf0 [mac80211]
  [  972.637575]  [<ffffffffa02d9db1>] ieee80211_do_stop+0x2a1/0x650 [mac80211]
  [  972.637585]  [<ffffffff815e9391>] ? dev_deactivate_many+0x201/0x250
  [  972.637611]  [<ffffffffa02da17a>] ieee80211_stop+0x1a/0x20 [mac80211]
  [  972.637619]  [<ffffffff815c63cd>] __dev_close_many+0x7d/0xc0
  [  972.637626]  [<ffffffff815c643d>] __dev_close+0x2d/0x40
  [  972.637634]  [<ffffffff815cc871>] __dev_change_flags+0xa1/0x180
  [  972.637642]  [<ffffffff815cca08>] dev_change_flags+0x28/0x70
  [  972.637650]  [<ffffffff815d9320>] do_setlink+0x3a0/0xa40

  --- CUT ---

  The last kernel version with the issue was not reproduced was 3.5.40.

  ProblemType: Bug
  DistroRelease: Ubuntu 13.04
  Package: linux-image-3.8.0-31-generic 3.8.0-31.46
  ProcVersionSignature: Ubuntu 3.8.0-31.46-generic 3.8.13.8
  Uname: Linux 3.8.0-31-generic x86_64
  ApportVersion: 2.9.2-0ubuntu8.4
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  sharath    2433 F.... pulseaudio
  Date: Tue Sep 17 13:09:22 2013
  HibernationDevice: RESUME=UUID=a65c7147-fc92-4b66-856c-4cd6489c8e02
  InstallationDate: Installed on 2013-01-21 (238 days ago)
  InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
  MachineType: Dell Inc. XPS L421X
  MarkForUpload: True
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.8.0-31-generic root=UUID=ccb29335-a20e-4b37-80e4-a4dcd91dec31 ro
  RelatedPackageVersions:
   linux-restricted-modules-3.8.0-31-generic N/A
   linux-backports-modules-3.8.0-31-generic  N/A
   linux-firmware                            1.106
  SourcePackage: linux
  UpgradeStatus: Upgraded to raring on 2013-08-27 (20 days ago)
  dmi.bios.date: 08/27/2012
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A09
  dmi.board.name: 09JP1V
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: A09
  dmi.modalias: dmi:bvnDellInc.:bvrA09:bd08/27/2012:svnDellInc.:pnXPSL421X:pvrA09:rvnDellInc.:rn09JP1V:rvrA00:cvnDellInc.:ct8:cvrA09:
  dmi.product.name: XPS L421X
  dmi.product.version: A09
  dmi.sys.vendor: Dell Inc.

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