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[Chris J Arges <1345008@xxxxxxxxxxxxxxxxxx>]

This is included in 3.18-rc4. It is applied to 3.16.y stable, and I've
requested inclusion in 3.13.y stable.

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https://bugs.launchpad.net/bugs/1345008

Title:
  WARNING: CPU: 0 PID: 71 at
  /build/buildd/linux-3.13.0/fs/sysfs/group.c:214
  sysfs_remove_group+0xc6/0xd0()

Status in “linux” package in Ubuntu:
  In Progress
Status in “linux” source package in Trusty:
  New
Status in “linux” source package in Utopic:
  New

Bug description:
  [Impact]

  This impacts 3.16 and 3.13 series kernels.

  When powering off a USB audio device that is plugged into the computer the following kernel WARNs are displayed:
  [  410.508315] usb 1-1.4: USB disconnect, device number 4
  [  410.510722] ------------[ cut here ]------------
  [  410.510731] WARNING: CPU: 0 PID: 71 at /build/buildd/linux-3.13.0/fs/sysfs/group.c:214 sysfs_remove_group+0xc6/0xd0()
  [  410.510733] sysfs group ffffffff81cabae0 not found for kobject 'midiC3D0'
  [  410.510734] Modules linked in: xt_conntrack ipt_REJECT ip6table_filter ip6_tables ebtable_nat ebtables hid_logitech_dj hid_generic usbhid hid xt_CHECKSUM iptable_mangle ipt_MASQUERADE iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack xt_tcpudp bridge stp llc iptable_filter ip_tables x_tables usb_storage dm_crypt gpio_ich intel_rapl x86_pkg_temp_thermal coretemp kvm_intel uvcvideo videobuf2_vmalloc kvm videobuf2_memops snd_usb_audio videobuf2_core videodev snd_usbmidi_lib crct10dif_pclmul crc32_pclmul ghash_clmulni_intel nvidia(POF) bnep rfcomm snd_hda_codec_hdmi aesni_intel bluetooth aes_x86_64 lrw gf128mul glue_helper ablk_helper snd_hda_codec_realtek cryptd serio_raw snd_seq_midi snd_hda_intel snd_seq_midi_event snd_hda_codec snd_hwdep snd_rawmidi snd_pcm mei_me snd_seq lpc_ich mei snd_page_alloc snd_seq_device snd_timer snd soundcore mac_hid wmi parport_pc ppdev binfmt_misc lp parport i915 video i2c_algo_bit ahci drm_kms_helper libahci firewire_ohci e1000e drm psmouse firewire_core ptp crc_itu_t pps_core
  [  410.510801] CPU: 0 PID: 71 Comm: khubd Tainted: PF          O 3.13.0-32-generic #57-Ubuntu
  [  410.510803] Hardware name: LENOVO 7052B9U/        , BIOS 9HKT47AUS 01/10/2012
  [  410.510805]  0000000000000009 ffff8804275b1990 ffffffff8171bcb4 ffff8804275b19d8
  [  410.510809]  ffff8804275b19c8 ffffffff810676cd 0000000000000000 ffffffff81cabae0
  [  410.510813]  ffff880424710c10 ffff880424710000 ffff880422c1bcf8 ffff8804275b1a28
  [  410.510816] Call Trace:
  [  410.510824]  [<ffffffff8171bcb4>] dump_stack+0x45/0x56
  [  410.510829]  [<ffffffff810676cd>] warn_slowpath_common+0x7d/0xa0
  [  410.510832]  [<ffffffff8106773c>] warn_slowpath_fmt+0x4c/0x50
  [  410.510836]  [<ffffffff8123446e>] ? sysfs_get_dirent_ns+0x4e/0x70
  [  410.510839]  [<ffffffff81235756>] sysfs_remove_group+0xc6/0xd0
  [  410.510844]  [<ffffffff814998c3>] dpm_sysfs_remove+0x43/0x50
  [  410.510849]  [<ffffffff8148f2c5>] device_del+0x45/0x1c0
  [  410.510852]  [<ffffffff8148f45e>] device_unregister+0x1e/0x60
  [  410.510856]  [<ffffffff8148f51c>] device_destroy+0x3c/0x50
  [  410.510866]  [<ffffffffa02142ed>] snd_unregister_device+0x4d/0xa0 [snd]
  [  410.510872]  [<ffffffffa029fc76>] snd_rawmidi_dev_disconnect+0xc6/0xf0 [snd_rawmidi]
  [  410.510881]  [<ffffffffa021b2ea>] snd_device_disconnect+0x6a/0xf0 [snd]
  [  410.510889]  [<ffffffffa021b43c>] snd_device_disconnect_all+0x4c/0x90 [snd]
  [  410.510896]  [<ffffffffa0214861>] snd_card_disconnect+0x131/0x1e0 [snd]
  [  410.510904]  [<ffffffffa0ead480>] usb_audio_disconnect+0x80/0x1b0 [snd_usb_audio]
  [  410.510909]  [<ffffffff81546a14>] usb_unbind_interface+0x64/0x1c0
  [  410.510913]  [<ffffffff81492fdf>] __device_release_driver+0x7f/0xf0
  [  410.510916]  [<ffffffff81493073>] device_release_driver+0x23/0x30
  [  410.510918]  [<ffffffff814928f8>] bus_remove_device+0x108/0x180
  [  410.510922]  [<ffffffff8148f3a9>] device_del+0x129/0x1c0
  [  410.510925]  [<ffffffff815443f0>] usb_disable_device+0xb0/0x290
  [  410.510929]  [<ffffffff81538f4d>] usb_disconnect+0xad/0x200
  [  410.510933]  [<ffffffff8153b9f5>] hub_port_connect_change+0xd5/0xb50
  [  410.510937]  [<ffffffff81542df4>] ? usb_control_msg+0xd4/0x110
  [  410.510941]  [<ffffffff8153c934>] hub_events+0x4c4/0xa20
  [  410.510944]  [<ffffffff8153cec5>] hub_thread+0x35/0x160
  [  410.510950]  [<ffffffff810aaf00>] ? prepare_to_wait_event+0x100/0x100
  [  410.510953]  [<ffffffff8153ce90>] ? hub_events+0xa20/0xa20
  [  410.510957]  [<ffffffff8108b3d2>] kthread+0xd2/0xf0
  [  410.510961]  [<ffffffff8108b300>] ? kthread_create_on_node+0x1d0/0x1d0
  [  410.510966]  [<ffffffff8172c5bc>] ret_from_fork+0x7c/0xb0
  [  410.510969]  [<ffffffff8108b300>] ? kthread_create_on_node+0x1d0/0x1d0
  [  410.510971] ---[ end trace 68a53e3235c146ed ]---
  [  410.511060] ------------[ cut here ]------------

  [ Test Case ]
  1) Use a USB Audio device.
  2) Turn the power of the device on and off.
  3) Check dmesg for output.

  [Fix]
  commit 0725dda207e95ff25f1aa01432250323e0ec49d6 upstream

  --

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-32-generic 3.13.0-32.57
  ProcVersionSignature: Ubuntu 3.13.0-32.57-generic 3.13.11.4
  Uname: Linux 3.13.0-32-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 2.14.1-0ubuntu3.2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  arges      2670 F.... pulseaudio
   /dev/snd/controlC2:  arges      2670 F.... pulseaudio
   /dev/snd/controlC0:  arges      2670 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Sat Jul 19 12:35:49 2014
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2014-07-18 (1 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  MachineType: LENOVO 7052B9U
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-32-generic root=UUID=8012e371-1ce8-4a24-ac05-13305882aad6 ro quiet splash
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-32-generic N/A
   linux-backports-modules-3.13.0-32-generic  N/A
   linux-firmware                             1.127.4
  RfKill:

  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 01/10/2012
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 9HKT47AUS
  dmi.board.vendor: LENOVO
  dmi.chassis.type: 3
  dmi.chassis.vendor: To Be Filled By O.E.M.
  dmi.chassis.version: To Be Filled By O.E.M.
  dmi.modalias: dmi:bvnLENOVO:bvr9HKT47AUS:bd01/10/2012:svnLENOVO:pn7052B9U:pvrThinkCentreM91p:rvnLENOVO:rn:rvr:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
  dmi.product.name: 7052B9U
  dmi.product.version: ThinkCentre M91p
  dmi.sys.vendor: LENOVO

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