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Date
[Bug 1417450] Re: Kernel modul mac80211 crashed

To: kernel-packages@xxxxxxxxxxxxxxxxxxx
From: Daniel Mehrmann <daniel.mehrmann@xxxxxx>
Date: Tue, 03 Feb 2015 09:58:16 -0000
Reply-to: Bug 1417450 <1417450@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx
** Summary changed:

- Kernel modul iwlwifi crashed
+ Kernel modul mac80211 crashed

** Description changed:

- From time to time my kernel wlan modul  iwlwifi is crashing. I'm using
+ From time to time my kernel wlan modul  mac80211 is crashing. I'm using
  my laptop daily and once in a month this happen. I can't force this bug.
  I only can say that it happens mostly during big data transfer
  (sftp/backup).
- 
  
  /var/log/boot.log.1:
  
  ------------[ cut here ]------------
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106187] WARNING: CPU: 3 PID: 76 at /build/buildd/linux-lts-utopic-3.16.0/net/mac80211/util.c:1565 ieee80211_reconfig+0x4b1/0x1500 [mac80211]()
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106194] Hardware became unavailable during restart.
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106219] Modules linked in: vmw_vsock_vmci_transport vsock vmw_vmci bnep rfcomm binfmt_misc xfs libcrc32c uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core v4l2_common videodev media arc4 iwldvm mac80211 intel_rapl x86_pkg_temp_thermal intel_powerclamp kvm_intel kvm i915 snd_hda_codec_hdmi btusb iwlwifi crct10dif_pclmul crc32_pclmul snd_hda_codec_realtek bluetooth rtsx_pci_ms drm_kms_helper snd_hda_codec_generic joydev cfg80211 serio_raw ghash_clmulni_intel 6lowpan_iphc snd_hda_intel cryptd drm mei_me snd_hda_controller snd_hda_codec snd_hwdep i2c_algo_bit thinkpad_acpi wmi memstick mei snd_pcm snd_seq_midi snd_seq_midi_event snd_rawmidi snd_seq nvram lpc_ich snd_seq_device snd_timer snd video mac_hid soundcore parport_pc ppdev coretemp lp parport hid_generic usbhid hid rtsx_pci_sdmmc psmouse r8169 ahci libahci mii rtsx_pci
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106268] CPU: 3 PID: 76 Comm: kworker/3:1 Not tainted 3.16.0-30-generic #40~14.04.1-Ubuntu
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106269] Hardware name: LENOVO 3354APG/3354APG, BIOS H3ET72WW(1.09) 02/25/2013
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106277] Workqueue: events ieee80211_restart_work [mac80211]
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106279]  0000000000000009 ffff880210edbce8
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106282] ieee80211 phy0: Hardware restart was requested
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106283]  ffffffff81762590 ffff880210edbd30
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106285]  ffff880210edbd20 ffffffff8106dd2d 00000000fffffffb ffff880212710680
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106287]  ffff880212711738 0000000000000000 ffff880212710680 ffff880210edbd80
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106290] Call Trace:
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106295]  [<ffffffff81762590>] dump_stack+0x45/0x56
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106307]  [<ffffffff8106dd2d>] warn_slowpath_common+0x7d/0xa0
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106317]  [<ffffffff8106dd9c>] warn_slowpath_fmt+0x4c/0x50
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106322]  [<ffffffff810889cf>] ? flush_workqueue+0x17f/0x5a0
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106333]  [<ffffffffc06b1f81>] ieee80211_reconfig+0x4b1/0x1500 [mac80211]
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106344]  [<ffffffffc06841b2>] ieee80211_restart_work+0x42/0x70 [mac80211]
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106346]  [<ffffffff81089ef2>] process_one_work+0x182/0x450
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106348]  [<ffffffff8108a663>] worker_thread+0x123/0x5a0
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106351]  [<ffffffff8108a540>] ? rescuer_thread+0x380/0x380
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106354]  [<ffffffff810912c2>] kthread+0xd2/0xf0
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106357]  [<ffffffff810911f0>] ? kthread_create_on_node+0x1c0/0x1c0
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106361]  [<ffffffff8176ac3c>] ret_from_fork+0x7c/0xb0
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106363]  [<ffffffff810911f0>] ? kthread_create_on_node+0x1c0/0x1c0
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106365] ---[ end trace cf4f868f9d3defa0 ]---
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106417] ------------[ cut here ]------------
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106428] WARNING: CPU: 3 PID: 76 at /build/buildd/linux-lts-utopic-3.16.0/net/mac80211/driver-ops.h:12 ieee80211_do_stop+0x88a/0x8f0 [mac80211]()
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106430] wlan0:  Failed check-sdata-in-driver check, flags: 0x0
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106431] Modules linked in: vmw_vsock_vmci_transport vsock vmw_vmci bnep rfcomm binfmt_misc xfs libcrc32c uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core v4l2_common videodev media arc4 iwldvm mac80211 intel_rapl x86_pkg_temp_thermal intel_powerclamp kvm_intel kvm i915 snd_hda_codec_hdmi btusb iwlwifi crct10dif_pclmul crc32_pclmul snd_hda_codec_realtek bluetooth rtsx_pci_ms drm_kms_helper snd_hda_codec_generic joydev cfg80211 serio_raw ghash_clmulni_intel 6lowpan_iphc snd_hda_intel cryptd drm mei_me snd_hda_controller snd_hda_codec snd_hwdep i2c_algo_bit thinkpad_acpi wmi memstick mei snd_pcm snd_seq_midi snd_seq_midi_event snd_rawmidi snd_seq nvram lpc_ich snd_seq_device snd_timer snd video mac_hid soundcore parport_pc ppdev coretemp lp parport hid_generic usbhid hid rtsx_pci_sdmmc psmouse r8169 ahci libahci mii rtsx_pci
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106468] CPU: 3 PID: 76 Comm: kworker/3:1 Tainted: G        W     3.16.0-30-generic #40~14.04.1-Ubuntu
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106469] Hardware name: LENOVO 3354APG/3354APG, BIOS H3ET72WW(1.09) 02/25/2013
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106476] Workqueue: events ieee80211_restart_work [mac80211]
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106477]  0000000000000009 ffff880210edbba0 ffffffff81762590 ffff880210edbbe8
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106480]  ffff880210edbbd8 ffffffff8106dd2d ffff880212710680 ffff88021056e8c0
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106482]  ffff8802127112b0 ffff8802127112c8 ffff8802127112c8 ffff880210edbc38
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106484] Call Trace:
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106487]  [<ffffffff81762590>] dump_stack+0x45/0x56
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106490]  [<ffffffff8106dd2d>] warn_slowpath_common+0x7d/0xa0
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106493]  [<ffffffff8106dd9c>] warn_slowpath_fmt+0x4c/0x50
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106504]  [<ffffffffc06ad19b>] ? ieee80211_clear_tx_pending+0x4b/0x70 [mac80211]
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106513]  [<ffffffffc0698e7a>] ieee80211_do_stop+0x88a/0x8f0 [mac80211]
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106516]  [<ffffffff81683d31>] ? dev_deactivate_many+0x221/0x270
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106525]  [<ffffffffc0698efa>] ieee80211_stop+0x1a/0x20 [mac80211]
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106527]  [<ffffffff8165b475>] __dev_close_many+0x95/0xf0
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106530]  [<ffffffff8165b551>] dev_close_many+0x81/0x120
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106533]  [<ffffffff8165d7f6>] dev_close.part.73+0x36/0x50
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106535]  [<ffffffff8165d831>] dev_close+0x21/0x30
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106545]  [<ffffffffc0339895>] cfg80211_shutdown_all_interfaces+0x45/0xb0 [cfg80211]
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106556]  [<ffffffffc06b1dd5>] ieee80211_reconfig+0x305/0x1500 [mac80211]
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106563]  [<ffffffffc06841b2>] ieee80211_restart_work+0x42/0x70 [mac80211]
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106566]  [<ffffffff81089ef2>] process_one_work+0x182/0x450
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106568]  [<ffffffff8108a663>] worker_thread+0x123/0x5a0
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106570]  [<ffffffff8108a540>] ? rescuer_thread+0x380/0x380
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106573]  [<ffffffff810912c2>] kthread+0xd2/0xf0
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106576]  [<ffffffff810911f0>] ? kthread_create_on_node+0x1c0/0x1c0
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106579]  [<ffffffff8176ac3c>] ret_from_fork+0x7c/0xb0
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106581]  [<ffffffff810911f0>] ? kthread_create_on_node+0x1c0/0x1c0
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106583] ---[ end trace cf4f868f9d3defa1 ]---
  
  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.16.0-30-generic 3.16.0-30.40~14.04.1
  ProcVersionSignature: Ubuntu 3.16.0-30.40~14.04.1-generic 3.16.7-ckt3
  Uname: Linux 3.16.0-30-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.6
  Architecture: amd64
  Date: Tue Feb  3 10:28:42 2015
  InstallationDate: Installed on 2014-12-28 (37 days ago)
  InstallationMedia: Xubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140723)
  ProcEnviron:
-  LANGUAGE=de_DE
-  TERM=xterm
-  PATH=(custom, no user)
-  LANG=de_DE.UTF-8
-  SHELL=/bin/bash
+  LANGUAGE=de_DE
+  TERM=xterm
+  PATH=(custom, no user)
+  LANG=de_DE.UTF-8
+  SHELL=/bin/bash
  SourcePackage: linux-lts-utopic
  UpgradeStatus: No upgrade log present (probably fresh install)

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https://bugs.launchpad.net/bugs/1417450

Title:
  Kernel modul mac80211 crashed

Status in linux-lts-utopic package in Ubuntu:
  New

Bug description:
  From time to time my kernel wlan modul  mac80211 is crashing. I'm
  using my laptop daily and once in a month this happen. I can't force
  this bug. I only can say that it happens mostly during big data
  transfer (sftp/backup).

  /var/log/boot.log.1:

  ------------[ cut here ]------------
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106187] WARNING: CPU: 3 PID: 76 at /build/buildd/linux-lts-utopic-3.16.0/net/mac80211/util.c:1565 ieee80211_reconfig+0x4b1/0x1500 [mac80211]()
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106194] Hardware became unavailable during restart.
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106219] Modules linked in: vmw_vsock_vmci_transport vsock vmw_vmci bnep rfcomm binfmt_misc xfs libcrc32c uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core v4l2_common videodev media arc4 iwldvm mac80211 intel_rapl x86_pkg_temp_thermal intel_powerclamp kvm_intel kvm i915 snd_hda_codec_hdmi btusb iwlwifi crct10dif_pclmul crc32_pclmul snd_hda_codec_realtek bluetooth rtsx_pci_ms drm_kms_helper snd_hda_codec_generic joydev cfg80211 serio_raw ghash_clmulni_intel 6lowpan_iphc snd_hda_intel cryptd drm mei_me snd_hda_controller snd_hda_codec snd_hwdep i2c_algo_bit thinkpad_acpi wmi memstick mei snd_pcm snd_seq_midi snd_seq_midi_event snd_rawmidi snd_seq nvram lpc_ich snd_seq_device snd_timer snd video mac_hid soundcore parport_pc ppdev coretemp lp parport hid_generic usbhid hid rtsx_pci_sdmmc psmouse r8169 ahci libahci mii rtsx_pci
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106268] CPU: 3 PID: 76 Comm: kworker/3:1 Not tainted 3.16.0-30-generic #40~14.04.1-Ubuntu
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106269] Hardware name: LENOVO 3354APG/3354APG, BIOS H3ET72WW(1.09) 02/25/2013
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106277] Workqueue: events ieee80211_restart_work [mac80211]
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106279]  0000000000000009 ffff880210edbce8
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106282] ieee80211 phy0: Hardware restart was requested
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106283]  ffffffff81762590 ffff880210edbd30
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106285]  ffff880210edbd20 ffffffff8106dd2d 00000000fffffffb ffff880212710680
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106287]  ffff880212711738 0000000000000000 ffff880212710680 ffff880210edbd80
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106290] Call Trace:
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106295]  [<ffffffff81762590>] dump_stack+0x45/0x56
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106307]  [<ffffffff8106dd2d>] warn_slowpath_common+0x7d/0xa0
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106317]  [<ffffffff8106dd9c>] warn_slowpath_fmt+0x4c/0x50
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106322]  [<ffffffff810889cf>] ? flush_workqueue+0x17f/0x5a0
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106333]  [<ffffffffc06b1f81>] ieee80211_reconfig+0x4b1/0x1500 [mac80211]
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106344]  [<ffffffffc06841b2>] ieee80211_restart_work+0x42/0x70 [mac80211]
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106346]  [<ffffffff81089ef2>] process_one_work+0x182/0x450
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106348]  [<ffffffff8108a663>] worker_thread+0x123/0x5a0
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106351]  [<ffffffff8108a540>] ? rescuer_thread+0x380/0x380
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106354]  [<ffffffff810912c2>] kthread+0xd2/0xf0
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106357]  [<ffffffff810911f0>] ? kthread_create_on_node+0x1c0/0x1c0
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106361]  [<ffffffff8176ac3c>] ret_from_fork+0x7c/0xb0
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106363]  [<ffffffff810911f0>] ? kthread_create_on_node+0x1c0/0x1c0
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106365] ---[ end trace cf4f868f9d3defa0 ]---
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106417] ------------[ cut here ]------------
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106428] WARNING: CPU: 3 PID: 76 at /build/buildd/linux-lts-utopic-3.16.0/net/mac80211/driver-ops.h:12 ieee80211_do_stop+0x88a/0x8f0 [mac80211]()
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106430] wlan0:  Failed check-sdata-in-driver check, flags: 0x0
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106431] Modules linked in: vmw_vsock_vmci_transport vsock vmw_vmci bnep rfcomm binfmt_misc xfs libcrc32c uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core v4l2_common videodev media arc4 iwldvm mac80211 intel_rapl x86_pkg_temp_thermal intel_powerclamp kvm_intel kvm i915 snd_hda_codec_hdmi btusb iwlwifi crct10dif_pclmul crc32_pclmul snd_hda_codec_realtek bluetooth rtsx_pci_ms drm_kms_helper snd_hda_codec_generic joydev cfg80211 serio_raw ghash_clmulni_intel 6lowpan_iphc snd_hda_intel cryptd drm mei_me snd_hda_controller snd_hda_codec snd_hwdep i2c_algo_bit thinkpad_acpi wmi memstick mei snd_pcm snd_seq_midi snd_seq_midi_event snd_rawmidi snd_seq nvram lpc_ich snd_seq_device snd_timer snd video mac_hid soundcore parport_pc ppdev coretemp lp parport hid_generic usbhid hid rtsx_pci_sdmmc psmouse r8169 ahci libahci mii rtsx_pci
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106468] CPU: 3 PID: 76 Comm: kworker/3:1 Tainted: G        W     3.16.0-30-generic #40~14.04.1-Ubuntu
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106469] Hardware name: LENOVO 3354APG/3354APG, BIOS H3ET72WW(1.09) 02/25/2013
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106476] Workqueue: events ieee80211_restart_work [mac80211]
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106477]  0000000000000009 ffff880210edbba0 ffffffff81762590 ffff880210edbbe8
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106480]  ffff880210edbbd8 ffffffff8106dd2d ffff880212710680 ffff88021056e8c0
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106482]  ffff8802127112b0 ffff8802127112c8 ffff8802127112c8 ffff880210edbc38
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106484] Call Trace:
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106487]  [<ffffffff81762590>] dump_stack+0x45/0x56
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106490]  [<ffffffff8106dd2d>] warn_slowpath_common+0x7d/0xa0
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106493]  [<ffffffff8106dd9c>] warn_slowpath_fmt+0x4c/0x50
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106504]  [<ffffffffc06ad19b>] ? ieee80211_clear_tx_pending+0x4b/0x70 [mac80211]
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106513]  [<ffffffffc0698e7a>] ieee80211_do_stop+0x88a/0x8f0 [mac80211]
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106516]  [<ffffffff81683d31>] ? dev_deactivate_many+0x221/0x270
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106525]  [<ffffffffc0698efa>] ieee80211_stop+0x1a/0x20 [mac80211]
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106527]  [<ffffffff8165b475>] __dev_close_many+0x95/0xf0
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106530]  [<ffffffff8165b551>] dev_close_many+0x81/0x120
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106533]  [<ffffffff8165d7f6>] dev_close.part.73+0x36/0x50
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106535]  [<ffffffff8165d831>] dev_close+0x21/0x30
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106545]  [<ffffffffc0339895>] cfg80211_shutdown_all_interfaces+0x45/0xb0 [cfg80211]
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106556]  [<ffffffffc06b1dd5>] ieee80211_reconfig+0x305/0x1500 [mac80211]
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106563]  [<ffffffffc06841b2>] ieee80211_restart_work+0x42/0x70 [mac80211]
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106566]  [<ffffffff81089ef2>] process_one_work+0x182/0x450
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106568]  [<ffffffff8108a663>] worker_thread+0x123/0x5a0
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106570]  [<ffffffff8108a540>] ? rescuer_thread+0x380/0x380
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106573]  [<ffffffff810912c2>] kthread+0xd2/0xf0
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106576]  [<ffffffff810911f0>] ? kthread_create_on_node+0x1c0/0x1c0
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106579]  [<ffffffff8176ac3c>] ret_from_fork+0x7c/0xb0
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106581]  [<ffffffff810911f0>] ? kthread_create_on_node+0x1c0/0x1c0
  Feb  1 10:49:20 Homer-Mobil kernel: [   18.106583] ---[ end trace cf4f868f9d3defa1 ]---

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.16.0-30-generic 3.16.0-30.40~14.04.1
  ProcVersionSignature: Ubuntu 3.16.0-30.40~14.04.1-generic 3.16.7-ckt3
  Uname: Linux 3.16.0-30-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.6
  Architecture: amd64
  Date: Tue Feb  3 10:28:42 2015
  InstallationDate: Installed on 2014-12-28 (37 days ago)
  InstallationMedia: Xubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140723)
  ProcEnviron:
   LANGUAGE=de_DE
   TERM=xterm
   PATH=(custom, no user)
   LANG=de_DE.UTF-8
   SHELL=/bin/bash
  SourcePackage: linux-lts-utopic
  UpgradeStatus: No upgrade log present (probably fresh install)

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References

[Bug 1417450] [NEW] Kernel modul iwlwifi crashed
From: Daniel Mehrmann, 2015-02-03