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[PascalC <p92@xxxxxxx>]

This is the result with 
Linux minipc 3.19.0-031900rc6-lowlatency #201501261152 SMP PREEMPT Mon Jan 26 17:02:06 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

see attachement for syslog.

Jan 28 19:54:49 minipc kernel: [ 1344.093797] ------------[ cut here ]------------
Jan 28 19:54:49 minipc kernel: [ 1344.093801] WARNING: CPU: 0 PID: 3412 at /home/kernel/COD/linux/fs/sysfs/group.c:219 sysfs_remove_group+0xa3/0xb0()
Jan 28 19:54:49 minipc kernel: [ 1344.093803] sysfs group ffffffff81cb72a0 not found for kobject 'media0'
Jan 28 19:54:49 minipc kernel: [ 1344.093804] Modules linked in: xt_CHECKSUM iptable_mangle ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack ipt_REJECT nf_reject_ipv4 xt_tcpudp iptable_filter ip_tables x_tables bridge stp llc ib_iser rdma_cm iw_cm ib_cm ib_sa ib_mad ib_core ib_addr iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi nfsv3 dm_crypt rpcsec_gss_krb5 nfsv4 ir_lirc_codec ir_xmp_decoder lirc_dev ir_mce_kbd_decoder pl2303 usbserial ir_sharp_decoder ir_sanyo_decoder ir_sony_decoder ir_jvc_decoder ir_rc6_decoder ir_rc5_decoder ir_nec_decoder rc_rc6_mce mceusb rc_core bnep rfcomm bluetooth snd_hda_codec_realtek snd_hda_codec_generic snd_hda_intel nfsd snd_hda_controller snd_usb_audio auth_rpcgss snd_hda_codec nfs_acl nfs lockd grace binfmt_misc sunrpc coretemp snd_usbmidi_lib fscache snd_hwdep kvm_intel snd_seq_midi snd_seq_midi_event kvm snd_rawmidi uvcvideo videobuf2_vmalloc videobuf2_memops serio_raw snd_pcm videobuf2_core v4l2_common joydev snd_seq videodev media snd_seq_device snd_timer lpc_ich snd soundcore mac_hid parport_pc ppdev lp parport btrfs xor raid6_pq hid_generic i915 firewire_ohci firewire_core psmouse crc_itu_t video i2c_algo_bit drm_kms_helper pata_acpi drm e1000e ptp pps_core usbhid hid
Jan 28 19:54:49 minipc kernel: [ 1344.093881] CPU: 0 PID: 3412 Comm: MediaManager Tainted: G        W      3.19.0-031900rc6-lowlatency #201501261152
Jan 28 19:54:49 minipc kernel: [ 1344.093883] Hardware name: AOpen i965GMx-IF/i965GMx-IF, BIOS 6.00 PG 10/03/2008
Jan 28 19:54:49 minipc kernel: [ 1344.093884]  00000000000000db ffff8800cafdfbc8 ffffffff817c8e7a 0000000000000007
Jan 28 19:54:49 minipc kernel: [ 1344.093887]  ffff8800cafdfc18 ffff8800cafdfc08 ffffffff81078697 ffff8800cafdfbf8
Jan 28 19:54:49 minipc kernel: [ 1344.093890]  ffffffff81cb72a0 ffff8800ca566898 0000000000000000 ffff88012aae2f20
Jan 28 19:54:49 minipc kernel: [ 1344.093894] Call Trace:
Jan 28 19:54:49 minipc kernel: [ 1344.093897]  [<ffffffff817c8e7a>] dump_stack+0x4c/0x6e
Jan 28 19:54:49 minipc kernel: [ 1344.093900]  [<ffffffff81078697>] warn_slowpath_common+0x97/0xe0
Jan 28 19:54:49 minipc kernel: [ 1344.093903]  [<ffffffff81078796>] warn_slowpath_fmt+0x46/0x50
Jan 28 19:54:49 minipc kernel: [ 1344.093906]  [<ffffffff8126c543>] ? kernfs_find_and_get_ns+0x53/0x70
Jan 28 19:54:49 minipc kernel: [ 1344.093910]  [<ffffffff81270793>] sysfs_remove_group+0xa3/0xb0
Jan 28 19:54:49 minipc kernel: [ 1344.093913]  [<ffffffff81503b99>] dpm_sysfs_remove+0x59/0x70
Jan 28 19:54:49 minipc kernel: [ 1344.093916]  [<ffffffff814f7b46>] device_del+0x56/0x230
Jan 28 19:54:49 minipc kernel: [ 1344.093920]  [<ffffffff814f7d42>] device_unregister+0x22/0x60
Jan 28 19:54:49 minipc kernel: [ 1344.093928]  [<ffffffffc068e055>] media_devnode_unregister+0x45/0x50 [media]
Jan 28 19:54:49 minipc kernel: [ 1344.093934]  [<ffffffffc068d2bd>] media_device_unregister+0x5d/0x70 [media]
Jan 28 19:54:49 minipc kernel: [ 1344.093940]  [<ffffffffc0717451>] uvc_delete+0x151/0x160 [uvcvideo]
Jan 28 19:54:49 minipc kernel: [ 1344.093946]  [<ffffffffc0717555>] uvc_release+0x25/0x30 [uvcvideo]
Jan 28 19:54:49 minipc kernel: [ 1344.093955]  [<ffffffffc069a986>] v4l2_device_release+0xe6/0x120 [videodev]
Jan 28 19:54:49 minipc kernel: [ 1344.093958]  [<ffffffff814f72ae>] device_release+0x3e/0xc0
Jan 28 19:54:49 minipc kernel: [ 1344.093960]  [<ffffffff813abe22>] kobject_cleanup+0x82/0x1c0
Jan 28 19:54:49 minipc kernel: [ 1344.093963]  [<ffffffff813abcb0>] kobject_put+0x30/0x70
Jan 28 19:54:49 minipc kernel: [ 1344.093966]  [<ffffffff814f6f77>] put_device+0x17/0x20
Jan 28 19:54:49 minipc kernel: [ 1344.093974]  [<ffffffffc06994aa>] v4l2_release+0x5a/0x90 [videodev]
Jan 28 19:54:49 minipc kernel: [ 1344.093976]  [<ffffffff811f8fb4>] __fput+0xb4/0x240
Jan 28 19:54:49 minipc kernel: [ 1344.093979]  [<ffffffff811f918e>] ____fput+0xe/0x10
Jan 28 19:54:49 minipc kernel: [ 1344.093982]  [<ffffffff810952cf>] task_work_run+0xaf/0xf0
Jan 28 19:54:49 minipc kernel: [ 1344.093986]  [<ffffffff81017107>] do_notify_resume+0xc7/0xd0
Jan 28 19:54:49 minipc kernel: [ 1344.093989]  [<ffffffff817d588f>] int_signal+0x12/0x17
Jan 28 19:54:49 minipc kernel: [ 1344.093991] ---[ end trace e430cc791155b0c4 ]---

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1411357

Title:
  crash in uvc_status_cleanup

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  when using firefox Hello videochat application, the webcam crashes.

  Step to reproduce:
  1. start firefox Hello
  2. click on start a conversation
  3. the webcam starts and hello displays the video
  4. just wait until the webcam disconnects

  then the following appear in the syslog:
  https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1411357/+attachment/4305725/+files/syslog

  ProblemType: Bug
  DistroRelease: Ubuntu 14.10
  Package: linux-image-lowlatency 3.16.0.29.30
  ProcVersionSignature: Ubuntu 3.16.0-29.39-lowlatency 3.16.7-ckt2
  Uname: Linux 3.16.0-29-lowlatency x86_64
  ApportVersion: 2.14.7-0ubuntu8
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  pascal     3177 F.... pulseaudio
   /dev/snd/pcmC0D0p:   pascal     3177 F...m pulseaudio
   /dev/snd/controlC0:  pascal     3177 F.... pulseaudio
  CurrentDesktop: KDE
  Date: Thu Jan 15 18:59:43 2015
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2015-01-03 (12 days ago)
  InstallationMedia: Kubuntu 14.10 "Utopic Unicorn" - Release amd64 (20141022.1)
  IwConfig:
   eth0      no wireless extensions.

   virbr0    no wireless extensions.

   lo        no wireless extensions.
  MachineType: AOpen i965GMx-IF
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.16.0-29-lowlatency root=UUID=076b58d2-a51a-4802-a928-ddafdecc1b83 ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.16.0-29-lowlatency N/A
   linux-backports-modules-3.16.0-29-lowlatency  N/A
   linux-firmware                                1.138.1
  RfKill:

  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 10/03/2008
  dmi.bios.vendor: Phoenix Technologies, LTD
  dmi.bios.version: 6.00 PG
  dmi.board.name: i965GMx-IF
  dmi.board.vendor: AOpen
  dmi.board.version: 558EX10I690
  dmi.chassis.type: 3
  dmi.chassis.vendor: AOpen
  dmi.chassis.version: i965GMx-IF
  dmi.modalias: dmi:bvnPhoenixTechnologies,LTD:bvr6.00PG:bd10/03/2008:svnAOpen:pni965GMx-IF:pvrAO00001JW:rvnAOpen:rni965GMx-IF:rvr558EX10I690:cvnAOpen:ct3:cvri965GMx-IF:
  dmi.product.name: i965GMx-IF
  dmi.product.version: AO00001JW
  dmi.sys.vendor: AOpen

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