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[Shevek <1434765@xxxxxxxxxxxxxxxxxx>]

Wireless is generally flaky, so  I'm not sure I can attribute a specific
user-visible occurrence to this bug. It tends to disassociate at
inconvenient moments, and I'm sure I use more bad language than my
mother would approve of.

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https://bugs.launchpad.net/bugs/1434765

Title:
  warn_slowpath in ieee80211_recalc_smps

Status in linux package in Ubuntu:
  New

Bug description:
  Mar 20 11:40:06 raven NetworkManager[1799]: <info> sleep requested (sleeping: no  enabled: yes)
  Mar 20 11:40:06 raven NetworkManager[1799]: <info> sleeping...
  Mar 20 11:40:06 raven NetworkManager[1799]: <info> (eth0): device state change: unavailable -> unmanaged (reason 'sleeping') [20 10 37]
  Mar 20 11:40:06 raven NetworkManager[1799]: <info> (wlan0): device state change: activated -> unmanaged (reason 'sleeping') [100 10 37]
  Mar 20 11:40:06 raven NetworkManager[1799]: <info> (wlan0): deactivating device (reason 'sleeping') [37]
  Mar 20 11:40:06 raven NetworkManager[1799]: <info> (wlan0): canceled DHCP transaction, DHCP client pid 23893
  Mar 20 11:40:06 raven avahi-daemon[1774]: Withdrawing address record for fe80::6257:18ff:febf:99d3 on wlan0.
  Mar 20 11:40:06 raven avahi-daemon[1774]: Leaving mDNS multicast group on interface wlan0.IPv6 with address fe80::6257:18ff:febf:99d3.
  Mar 20 11:40:06 raven avahi-daemon[1774]: Interface wlan0.IPv6 no longer relevant for mDNS.
  Mar 20 11:40:06 raven kernel: [39594.194083] wlan0: deauthenticating from 24:a4:3c:5c:ff:01 by local choice (Reason: 3=DEAUTH_LEAVING)
  Mar 20 11:40:06 raven wpa_supplicant[2029]: wlan0: CTRL-EVENT-DISCONNECTED bssid=24:a4:3c:5c:ff:01 reason=3 locally_generated=1
  Mar 20 11:40:06 raven avahi-daemon[1774]: Withdrawing address record for 10.146.25.7 on wlan0.
  Mar 20 11:40:06 raven avahi-daemon[1774]: Leaving mDNS multicast group on interface wlan0.IPv4 with address 10.146.25.7.
  Mar 20 11:40:06 raven kernel: [39594.222577] ------------[ cut here ]------------
  Mar 20 11:40:06 raven kernel: [39594.222611] WARNING: CPU: 0 PID: 24689 at /build/buildd/linux-3.19.0/net/mac80211/util.c:2113 ieee80211_recalc_smps+0x79/0x90 [mac80211]()
  Mar 20 11:40:06 raven kernel: [39594.222613] Modules linked in: msr usb_serial_simple usbserial ctr ccm rfcomm bnep nls_iso8859_1 joydev arc4 uvcvideo cdc_mbim videobuf2_vmalloc videobuf2_memops intel_rapl cdc_wdm videobuf2_core iosf_mbi x86_pkg_temp_thermal v4l2_common intel_powerclamp coretemp iwlmvm dm_multipath kvm_intel mac80211 scsi_dh serio_raw kvm cdc_ncm usbnet wacom videodev cdc_acm mii media btusb bluetooth snd_seq_midi snd_hda_codec_realtek iwlwifi snd_hda_codec_generic snd_hda_codec_hdmi snd_seq_midi_event cfg80211 nvram rtsx_pci_ms snd_rawmidi lpc_ich memstick shpchp snd_hda_intel snd_hda_controller snd_hda_codec snd_hwdep mei_me mei snd_pcm snd_seq snd_seq_device snd_timer snd soundcore mac_hid parport_pc ppdev lp parport autofs4 btrfs dm_crypt raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq raid1 raid0 multipath linear mmc_block usbhid hid rtsx_pci_sdmmc crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd i915 psmouse ahci e1000e libahci rtsx_pci ptp i2c_algo_bit pps_core drm_kms_helper drm wmi video
  Mar 20 11:40:06 raven kernel: [39594.222704] CPU: 0 PID: 24689 Comm: kworker/u16:0 Not tainted 3.19.0-9-generic #9-Ubuntu
  Mar 20 11:40:06 raven kernel: [39594.222706] Hardware name: LENOVO 20CKCTO1WW/20CKCTO1WW, BIOS N11ET29W (1.05 ) 12/26/2014
  Mar 20 11:40:06 raven kernel: [39594.222725] Workqueue: phy0 ieee80211_recalc_smps_work [mac80211]
  Mar 20 11:40:06 raven kernel: [39594.222729]  ffffffffc08b0568 ffff88009e0abd68 ffffffff817c09b5 0000000000000007
  Mar 20 11:40:06 raven kernel: [39594.222734]  0000000000000000 ffff88009e0abda8 ffffffff8107595a 0000000000000000
  Mar 20 11:40:06 raven kernel: [39594.222738]  ffff8800c5b517d0 ffff8800c9d368c0 ffff8800c5b50680 ffff8800c5929100
  Mar 20 11:40:06 raven kernel: [39594.222742] Call Trace:
  Mar 20 11:40:06 raven kernel: [39594.222751]  [<ffffffff817c09b5>] dump_stack+0x45/0x57
  Mar 20 11:40:06 raven kernel: [39594.222757]  [<ffffffff8107595a>] warn_slowpath_common+0x8a/0xc0
  Mar 20 11:40:06 raven kernel: [39594.222768]  [<ffffffff81075a4a>] warn_slowpath_null+0x1a/0x20
  Mar 20 11:40:06 raven kernel: [39594.222790]  [<ffffffffc086b469>] ieee80211_recalc_smps+0x79/0x90 [mac80211]
  Mar 20 11:40:06 raven kernel: [39594.222808]  [<ffffffffc084e3c5>] ieee80211_recalc_smps_work+0x15/0x20 [mac80211]
  Mar 20 11:40:06 raven kernel: [39594.222813]  [<ffffffff8108eb48>] process_one_work+0x158/0x430
  Mar 20 11:40:06 raven kernel: [39594.222817]  [<ffffffff8108f5db>] worker_thread+0x5b/0x530
  Mar 20 11:40:06 raven kernel: [39594.222822]  [<ffffffff8108f580>] ? rescuer_thread+0x3a0/0x3a0
  Mar 20 11:40:06 raven kernel: [39594.222827]  [<ffffffff81094679>] kthread+0xc9/0xe0
  Mar 20 11:40:06 raven kernel: [39594.222832]  [<ffffffff810945b0>] ? kthread_create_on_node+0x1c0/0x1c0
  Mar 20 11:40:06 raven kernel: [39594.222838]  [<ffffffff817c7a3c>] ret_from_fork+0x7c/0xb0
  Mar 20 11:40:06 raven kernel: [39594.222843]  [<ffffffff810945b0>] ? kthread_create_on_node+0x1c0/0x1c0
  Mar 20 11:40:06 raven kernel: [39594.222846] ---[ end trace 56452b3ca290b9f3 ]---

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: linux-image-3.19.0-9-generic 3.19.0-9.9
  ProcVersionSignature: Ubuntu 3.19.0-9.9-generic 3.19.1
  Uname: Linux 3.19.0-9-generic x86_64
  ApportVersion: 2.16.2-0ubuntu4
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  shevek     2618 F.... pulseaudio
   /dev/snd/controlC0:  shevek     2618 F.... pulseaudio
  CurrentDesktop: XFCE
  Date: Fri Mar 20 21:07:13 2015
  HibernationDevice: RESUME=UUID=cd97b65a-0d29-4887-a0e6-7c9eea8707b0
  InstallationDate: Installed on 2015-03-05 (15 days ago)
  InstallationMedia: Xubuntu 14.04.2 LTS "Trusty Tahr" - Release amd64 (20150218.1)
  MachineType: LENOVO 20CKCTO1WW
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.19.0-9-generic.efi.signed root=/dev/mapper/xubuntu--vg-root ro quiet splash crashkernel=384M-:128M nomdmonddf nomdmonisw crashkernel=384M-:128M nomdmonddf nomdmonisw crashkernel=384M-:128M vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.19.0-9-generic N/A
   linux-backports-modules-3.19.0-9-generic  N/A
   linux-firmware                            1.143
  SourcePackage: linux
  UpgradeStatus: Upgraded to vivid on 2015-03-19 (1 days ago)
  dmi.bios.date: 12/26/2014
  dmi.bios.vendor: LENOVO
  dmi.bios.version: N11ET29W (1.05 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20CKCTO1WW
  dmi.board.vendor: LENOVO
  dmi.board.version: SDK0E50512 STD
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: None
  dmi.modalias: dmi:bvnLENOVO:bvrN11ET29W(1.05):bd12/26/2014:svnLENOVO:pn20CKCTO1WW:pvrThinkPadT550:rvnLENOVO:rn20CKCTO1WW:rvrSDK0E50512STD:cvnLENOVO:ct10:cvrNone:
  dmi.product.name: 20CKCTO1WW
  dmi.product.version: ThinkPad T550
  dmi.sys.vendor: LENOVO

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