I tried latest mainline kernel available and the crash is still present.

# uname -a
Linux minipc 3.19.0-031900rc4-lowlatency #201501112135 SMP PREEMPT Sun Jan 11 21:42:06 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux


First I notice that the webcam stops by itself after several seconds with the following trace in syslog :


Jan 15 19:26:35 minipc kernel: [  214.121777] usb 2-4: USB disconnect, device number 3
Jan 15 19:26:35 minipc kernel: [  214.125214] uvcvideo: Failed to resubmit video URB (-19).
Jan 15 19:26:35 minipc kernel: [  214.528043] usb 2-4: new high-speed USB device number 6 using ehci-pci                                                                                      
Jan 15 19:26:35 minipc kernel: [  214.823034] usb 2-4: new high-speed USB device number 7 using ehci-pci                                                                                      
Jan 15 19:26:36 minipc kernel: [  215.194593] usb 2-4: New USB device found, idVendor=046d, idProduct=081d                                                                                    
Jan 15 19:26:36 minipc kernel: [  215.194598] usb 2-4: New USB device strings: Mfr=0, Product=0, SerialNumber=1                                                                               
Jan 15 19:26:36 minipc kernel: [  215.452968] usb 2-4: set resolution quirk: cval->res = 384   
Jan 15 19:26:36 minipc kernel: [  215.453468] uvcvideo: Found UVC 1.00 device <unnamed> (046d:081d)                                                                                           
Jan 15 19:26:36 minipc kernel: [  215.466056] input: UVC Camera (046d:081d) as /devices/pci0000:00/0000:00:1d.7/usb2/2-4/2-4:1.2/input/input14
Jan 15 19:26:36 minipc mtp-probe: checking bus 2, device 7: "/sys/devices/pci0000:00/0000:00:1d.7/usb2/2-4"
Jan 15 19:26:36 minipc mtp-probe: bus: 2, device: 7 was not an MTP device
Jan 15 19:26:36 minipc rtkit-daemon[3019]: Successfully made thread 3492 of process 3017 (n/a) owned by '1000' RT at priority 5.
Jan 15 19:26:36 minipc rtkit-daemon[3019]: Supervising 4 threads of 1 processes of 1 users.
Jan 15 19:27:39 minipc dbus[897]: [system] Activating service name='org.debian.AptXapianIndex' (using servicehelper)
Jan 15 19:27:40 minipc dbus[897]: [system] Successfully activated service 'org.debian.AptXapianIndex'
Jan 15 19:27:47 minipc kernel: [  286.803565] perf interrupt took too long (2504 > 2500), lowering kernel.perf_event_max_sample_rate to 50000



then when clicking on Hello disconnect button we have the 4 same crashes appearing  at once in syslog



Jan 15 19:29:14 minipc kernel: [  373.240109] ------------[ cut here ]------------
Jan 15 19:29:14 minipc kernel: [  373.240124] WARNING: CPU: 1 PID: 3451 at /home/apw/COD/linux/fs/sysfs/group.c:219 sysfs_remove_group+0xa3/0xb0()
Jan 15 19:29:14 minipc kernel: [  373.240126] sysfs group ffffffff81cb7260 not found for kobject 'event8'
Jan 15 19:29:14 minipc kernel: [  373.240128] 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 bnep rfcomm bluetooth rpcsec_gss_krb5 nfsv4 dm_crypt nfsd auth_rpcgss nfs_acl nfs lockd binfmt_misc grace sunrpc fscache ir_lirc_codec ir_xmp_decoder ir_sharp_decoder lirc_dev ir_mce_kbd_decoder ir_sony_decoder ir_sanyo_decoder ir_rc6_decoder ir_jvc_decoder ir_nec_decoder ir_rc5_decoder rc_rc6_mce pl2303 mceusb rc_core usbserial uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core v4l2_common snd_hda_codec_realtek snd_hda_codec_generic videodev snd_hda_intel snd_usb_audio snd_hda_controller snd_hda_codec media snd_usbmidi_lib snd_hwdep joydev snd_pcm coretemp snd_seq_midi snd_seq_midi_event kvm_intel snd_rawmidi kvm snd_seq snd_seq_device snd_timer snd soundcore serio_raw parport_pc lpc_ich ppdev lp mac_hid parport hid_generic psmouse e1000e pata_acpi i915 usbhid hid video i2c_algo_bit drm_kms_helper drm firewire_ohci firewire_core ptp crc_itu_t pps_core
Jan 15 19:29:14 minipc kernel: [  373.240226] CPU: 1 PID: 3451 Comm: MediaManager Tainted: G        W      3.19.0-031900rc4-lowlatency #201501112135
Jan 15 19:29:14 minipc kernel: [  373.240228] Hardware name: AOpen i965GMx-IF/i965GMx-IF, BIOS 6.00 PG 10/03/2008
Jan 15 19:29:14 minipc kernel: [  373.240230]  00000000000000db ffff8800738dfb98 ffffffff817c94ae 0000000000000007
Jan 15 19:29:14 minipc kernel: [  373.240234]  ffff8800738dfbe8 ffff8800738dfbd8 ffffffff81078657 ffff8800738dfbc8
Jan 15 19:29:14 minipc kernel: [  373.240237]  ffffffff81cb7260 ffff8800c942fcc0 0000000000000000 ffff88012a5287a0
Jan 15 19:29:14 minipc kernel: [  373.240241] Call Trace:
Jan 15 19:29:14 minipc kernel: [  373.240248]  [<ffffffff817c94ae>] dump_stack+0x4c/0x6e
Jan 15 19:29:14 minipc kernel: [  373.240252]  [<ffffffff81078657>] warn_slowpath_common+0x97/0xe0
Jan 15 19:29:14 minipc kernel: [  373.240256]  [<ffffffff81078756>] warn_slowpath_fmt+0x46/0x50
Jan 15 19:29:14 minipc kernel: [  373.240259]  [<ffffffff8126e2e3>] ? kernfs_find_and_get_ns+0x53/0x70
Jan 15 19:29:14 minipc kernel: [  373.240262]  [<ffffffff81272533>] sysfs_remove_group+0xa3/0xb0
Jan 15 19:29:14 minipc kernel: [  373.240267]  [<ffffffff81502e69>] dpm_sysfs_remove+0x59/0x70
Jan 15 19:29:14 minipc kernel: [  373.240271]  [<ffffffff814f6e16>] device_del+0x56/0x230
Jan 15 19:29:14 minipc kernel: [  373.240275]  [<ffffffff814a8846>] ? kbd_disconnect+0x26/0x30
Jan 15 19:29:14 minipc kernel: [  373.240280]  [<ffffffff8161427e>] evdev_disconnect+0x2e/0x70
Jan 15 19:29:14 minipc kernel: [  373.240283]  [<ffffffff8161038d>] __input_unregister_device+0xbd/0x170
Jan 15 19:29:14 minipc kernel: [  373.240286]  [<ffffffff81610495>] input_unregister_device+0x55/0x80
Jan 15 19:29:14 minipc kernel: [  373.240297]  [<ffffffffc07fd176>] uvc_status_cleanup+0x46/0x50 [uvcvideo]
Jan 15 19:29:14 minipc kernel: [  373.240303]  [<ffffffffc07f2318>] uvc_delete+0x18/0x160 [uvcvideo]
Jan 15 19:29:14 minipc kernel: [  373.240308]  [<ffffffffc07f2555>] uvc_release+0x25/0x30 [uvcvideo]
Jan 15 19:29:14 minipc kernel: [  373.240321]  [<ffffffffc0794986>] v4l2_device_release+0xe6/0x120 [videodev]
Jan 15 19:29:14 minipc kernel: [  373.240324]  [<ffffffff814f657e>] device_release+0x3e/0xc0
Jan 15 19:29:14 minipc kernel: [  373.240330]  [<ffffffffc07f5793>] ? uvc_v4l2_release+0x63/0x110 [uvcvideo]
Jan 15 19:29:14 minipc kernel: [  373.240334]  [<ffffffff813ad902>] kobject_cleanup+0x82/0x1c0
Jan 15 19:29:14 minipc kernel: [  373.240337]  [<ffffffff813ad790>] kobject_put+0x30/0x70
Jan 15 19:29:14 minipc kernel: [  373.240340]  [<ffffffff814f6247>] put_device+0x17/0x20
Jan 15 19:29:14 minipc kernel: [  373.240347]  [<ffffffffc07934aa>] v4l2_release+0x5a/0x90 [videodev]
Jan 15 19:29:14 minipc kernel: [  373.240351]  [<ffffffff811faad4>] __fput+0xb4/0x240
Jan 15 19:29:14 minipc kernel: [  373.240354]  [<ffffffff811facae>] ____fput+0xe/0x10
Jan 15 19:29:14 minipc kernel: [  373.240358]  [<ffffffff8109542f>] task_work_run+0xaf/0xf0
Jan 15 19:29:14 minipc kernel: [  373.240363]  [<ffffffff81017107>] do_notify_resume+0xc7/0xd0
Jan 15 19:29:14 minipc kernel: [  373.240366]  [<ffffffff817d5e8f>] int_signal+0x12/0x17
Jan 15 19:29:14 minipc kernel: [  373.240369] ---[ end trace 91c8a7ab90795723 ]---
Jan 15 19:29:14 minipc kernel: [  373.261071] ------------[ cut here ]------------
Jan 15 19:29:14 minipc kernel: [  373.261082] WARNING: CPU: 1 PID: 3451 at /home/apw/COD/linux/fs/sysfs/group.c:219 sysfs_remove_group+0xa3/0xb0()
Jan 15 19:29:14 minipc kernel: [  373.261085] sysfs group ffffffff81cb7260 not found for kobject 'input11'
Jan 15 19:29:14 minipc kernel: [  373.261087] 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 bnep rfcomm bluetooth rpcsec_gss_krb5 nfsv4 dm_crypt nfsd auth_rpcgss nfs_acl nfs lockd binfmt_misc grace sunrpc fscache ir_lirc_codec ir_xmp_decoder ir_sharp_decoder lirc_dev ir_mce_kbd_decoder ir_sony_decoder ir_sanyo_decoder ir_rc6_decoder ir_jvc_decoder ir_nec_decoder ir_rc5_decoder rc_rc6_mce pl2303 mceusb rc_core usbserial uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core v4l2_common snd_hda_codec_realtek snd_hda_codec_generic videodev snd_hda_intel snd_usb_audio snd_hda_controller snd_hda_codec media snd_usbmidi_lib snd_hwdep joydev snd_pcm coretemp snd_seq_midi snd_seq_midi_event kvm_intel snd_rawmidi kvm snd_seq snd_seq_device snd_timer snd soundcore serio_raw parport_pc lpc_ich ppdev lp mac_hid parport hid_generic psmouse e1000e pata_acpi i915 usbhid hid video i2c_algo_bit drm_kms_helper drm firewire_ohci firewire_core ptp crc_itu_t pps_core
Jan 15 19:29:14 minipc kernel: [  373.261185] CPU: 1 PID: 3451 Comm: MediaManager Tainted: G        W      3.19.0-031900rc4-lowlatency #201501112135
Jan 15 19:29:14 minipc kernel: [  373.261187] Hardware name: AOpen i965GMx-IF/i965GMx-IF, BIOS 6.00 PG 10/03/2008
Jan 15 19:29:14 minipc kernel: [  373.261189]  00000000000000db ffff8800738dfbc8 ffffffff817c94ae 0000000000000007
Jan 15 19:29:14 minipc kernel: [  373.261192]  ffff8800738dfc18 ffff8800738dfc08 ffffffff81078657 ffff8800738dfbf8
Jan 15 19:29:14 minipc kernel: [  373.261196]  ffffffff81cb7260 ffff8800c9a8f258 0000000000000000 ffff88012a5287a0
Jan 15 19:29:14 minipc kernel: [  373.261199] Call Trace:
Jan 15 19:29:14 minipc kernel: [  373.261206]  [<ffffffff817c94ae>] dump_stack+0x4c/0x6e
Jan 15 19:29:14 minipc kernel: [  373.261211]  [<ffffffff81078657>] warn_slowpath_common+0x97/0xe0
Jan 15 19:29:14 minipc kernel: [  373.261214]  [<ffffffff81078756>] warn_slowpath_fmt+0x46/0x50
Jan 15 19:29:14 minipc kernel: [  373.261217]  [<ffffffff8126e2e3>] ? kernfs_find_and_get_ns+0x53/0x70
Jan 15 19:29:14 minipc kernel: [  373.261221]  [<ffffffff81272533>] sysfs_remove_group+0xa3/0xb0
Jan 15 19:29:14 minipc kernel: [  373.261226]  [<ffffffff81502e69>] dpm_sysfs_remove+0x59/0x70
Jan 15 19:29:14 minipc kernel: [  373.261229]  [<ffffffff814f6e16>] device_del+0x56/0x230
Jan 15 19:29:14 minipc kernel: [  373.261233]  [<ffffffff810b9523>] ? __wake_up+0x53/0x70
Jan 15 19:29:14 minipc kernel: [  373.261237]  [<ffffffff81610419>] __input_unregister_device+0x149/0x170
Jan 15 19:29:14 minipc kernel: [  373.261240]  [<ffffffff81610495>] input_unregister_device+0x55/0x80
Jan 15 19:29:14 minipc kernel: [  373.261251]  [<ffffffffc07fd176>] uvc_status_cleanup+0x46/0x50 [uvcvideo]
Jan 15 19:29:14 minipc kernel: [  373.261256]  [<ffffffffc07f2318>] uvc_delete+0x18/0x160 [uvcvideo]
Jan 15 19:29:14 minipc kernel: [  373.261262]  [<ffffffffc07f2555>] uvc_release+0x25/0x30 [uvcvideo]
Jan 15 19:29:14 minipc kernel: [  373.261273]  [<ffffffffc0794986>] v4l2_device_release+0xe6/0x120 [videodev]
Jan 15 19:29:14 minipc kernel: [  373.261276]  [<ffffffff814f657e>] device_release+0x3e/0xc0
Jan 15 19:29:14 minipc kernel: [  373.261282]  [<ffffffffc07f5793>] ? uvc_v4l2_release+0x63/0x110 [uvcvideo]
Jan 15 19:29:14 minipc kernel: [  373.261286]  [<ffffffff813ad902>] kobject_cleanup+0x82/0x1c0
Jan 15 19:29:14 minipc kernel: [  373.261289]  [<ffffffff813ad790>] kobject_put+0x30/0x70
Jan 15 19:29:14 minipc kernel: [  373.261292]  [<ffffffff814f6247>] put_device+0x17/0x20
Jan 15 19:29:14 minipc kernel: [  373.261299]  [<ffffffffc07934aa>] v4l2_release+0x5a/0x90 [videodev]
Jan 15 19:29:14 minipc kernel: [  373.261303]  [<ffffffff811faad4>] __fput+0xb4/0x240
Jan 15 19:29:14 minipc kernel: [  373.261306]  [<ffffffff811facae>] ____fput+0xe/0x10
Jan 15 19:29:14 minipc kernel: [  373.261309]  [<ffffffff8109542f>] task_work_run+0xaf/0xf0
Jan 15 19:29:14 minipc kernel: [  373.261314]  [<ffffffff81017107>] do_notify_resume+0xc7/0xd0
Jan 15 19:29:14 minipc kernel: [  373.261318]  [<ffffffff817d5e8f>] int_signal+0x12/0x17
Jan 15 19:29:14 minipc kernel: [  373.261320] ---[ end trace 91c8a7ab90795724 ]---
Jan 15 19:29:14 minipc kernel: [  373.261331] ------------[ cut here ]------------
Jan 15 19:29:14 minipc kernel: [  373.261335] WARNING: CPU: 1 PID: 3451 at /home/apw/COD/linux/fs/sysfs/group.c:219 sysfs_remove_group+0xa3/0xb0()
Jan 15 19:29:14 minipc kernel: [  373.261337] sysfs group ffffffff81cd0280 not found for kobject 'input11'
Jan 15 19:29:14 minipc kernel: [  373.261338] 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 bnep rfcomm bluetooth rpcsec_gss_krb5 nfsv4 dm_crypt nfsd auth_rpcgss nfs_acl nfs lockd binfmt_misc grace sunrpc fscache ir_lirc_codec ir_xmp_decoder ir_sharp_decoder lirc_dev ir_mce_kbd_decoder ir_sony_decoder ir_sanyo_decoder ir_rc6_decoder ir_jvc_decoder ir_nec_decoder ir_rc5_decoder rc_rc6_mce pl2303 mceusb rc_core usbserial uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core v4l2_common snd_hda_codec_realtek snd_hda_codec_generic videodev snd_hda_intel snd_usb_audio snd_hda_controller snd_hda_codec media snd_usbmidi_lib snd_hwdep joydev snd_pcm coretemp snd_seq_midi snd_seq_midi_event kvm_intel snd_rawmidi kvm snd_seq snd_seq_device snd_timer snd soundcore serio_raw parport_pc lpc_ich ppdev lp mac_hid parport hid_generic psmouse e1000e pata_acpi i915 usbhid hid video i2c_algo_bit drm_kms_helper drm firewire_ohci firewire_core ptp crc_itu_t pps_core
Jan 15 19:29:14 minipc kernel: [  373.261411] CPU: 1 PID: 3451 Comm: MediaManager Tainted: G        W      3.19.0-031900rc4-lowlatency #201501112135
Jan 15 19:29:14 minipc kernel: [  373.261413] Hardware name: AOpen i965GMx-IF/i965GMx-IF, BIOS 6.00 PG 10/03/2008
Jan 15 19:29:14 minipc kernel: [  373.261415]  00000000000000db ffff8800738dfb88 ffffffff817c94ae 0000000000000007
Jan 15 19:29:14 minipc kernel: [  373.261418]  ffff8800738dfbd8 ffff8800738dfbc8 ffffffff81078657 ffff8800738dfbb8
Jan 15 19:29:14 minipc kernel: [  373.261421]  ffffffff81cd0280 ffff8800c9a8f258 0000000000000000 ffffffff81cd0180
Jan 15 19:29:14 minipc kernel: [  373.261424] Call Trace:
Jan 15 19:29:14 minipc kernel: [  373.261427]  [<ffffffff817c94ae>] dump_stack+0x4c/0x6e
Jan 15 19:29:14 minipc kernel: [  373.261430]  [<ffffffff81078657>] warn_slowpath_common+0x97/0xe0
Jan 15 19:29:14 minipc kernel: [  373.261433]  [<ffffffff81078756>] warn_slowpath_fmt+0x46/0x50
Jan 15 19:29:14 minipc kernel: [  373.261436]  [<ffffffff8126e2e3>] ? kernfs_find_and_get_ns+0x53/0x70
Jan 15 19:29:14 minipc kernel: [  373.261439]  [<ffffffff81272533>] sysfs_remove_group+0xa3/0xb0
Jan 15 19:29:14 minipc kernel: [  373.261442]  [<ffffffff8127257b>] sysfs_remove_groups+0x3b/0x60
Jan 15 19:29:14 minipc kernel: [  373.261445]  [<ffffffff814f6acb>] device_remove_attrs+0x5b/0x80
Jan 15 19:29:14 minipc kernel: [  373.261448]  [<ffffffff814f6ee0>] device_del+0x120/0x230
Jan 15 19:29:14 minipc kernel: [  373.261451]  [<ffffffff810b9523>] ? __wake_up+0x53/0x70
Jan 15 19:29:14 minipc kernel: [  373.261454]  [<ffffffff81610419>] __input_unregister_device+0x149/0x170
Jan 15 19:29:14 minipc kernel: [  373.261457]  [<ffffffff81610495>] input_unregister_device+0x55/0x80
Jan 15 19:29:14 minipc kernel: [  373.261464]  [<ffffffffc07fd176>] uvc_status_cleanup+0x46/0x50 [uvcvideo]
Jan 15 19:29:14 minipc kernel: [  373.261469]  [<ffffffffc07f2318>] uvc_delete+0x18/0x160 [uvcvideo]
Jan 15 19:29:14 minipc kernel: [  373.261475]  [<ffffffffc07f2555>] uvc_release+0x25/0x30 [uvcvideo]
Jan 15 19:29:14 minipc kernel: [  373.261482]  [<ffffffffc0794986>] v4l2_device_release+0xe6/0x120 [videodev]
Jan 15 19:29:14 minipc kernel: [  373.261485]  [<ffffffff814f657e>] device_release+0x3e/0xc0
Jan 15 19:29:14 minipc kernel: [  373.261491]  [<ffffffffc07f5793>] ? uvc_v4l2_release+0x63/0x110 [uvcvideo]
Jan 15 19:29:14 minipc kernel: [  373.261494]  [<ffffffff813ad902>] kobject_cleanup+0x82/0x1c0
Jan 15 19:29:14 minipc kernel: [  373.261496]  [<ffffffff813ad790>] kobject_put+0x30/0x70
Jan 15 19:29:14 minipc kernel: [  373.261499]  [<ffffffff814f6247>] put_device+0x17/0x20
Jan 15 19:29:14 minipc kernel: [  373.261506]  [<ffffffffc07934aa>] v4l2_release+0x5a/0x90 [videodev]
Jan 15 19:29:14 minipc kernel: [  373.261509]  [<ffffffff811faad4>] __fput+0xb4/0x240
Jan 15 19:29:14 minipc kernel: [  373.261512]  [<ffffffff811facae>] ____fput+0xe/0x10
Jan 15 19:29:14 minipc kernel: [  373.261515]  [<ffffffff8109542f>] task_work_run+0xaf/0xf0
Jan 15 19:29:14 minipc kernel: [  373.261518]  [<ffffffff81017107>] do_notify_resume+0xc7/0xd0
Jan 15 19:29:14 minipc kernel: [  373.261521]  [<ffffffff817d5e8f>] int_signal+0x12/0x17
Jan 15 19:29:14 minipc kernel: [  373.261523] ---[ end trace 91c8a7ab90795725 ]---
Jan 15 19:29:14 minipc kernel: [  373.261525] ------------[ cut here ]------------
Jan 15 19:29:14 minipc kernel: [  373.261528] WARNING: CPU: 1 PID: 3451 at /home/apw/COD/linux/fs/sysfs/group.c:219 sysfs_remove_group+0xa3/0xb0()
Jan 15 19:29:14 minipc kernel: [  373.261530] sysfs group ffffffff81cd02a0 not found for kobject 'input11'
Jan 15 19:29:14 minipc kernel: [  373.261531] 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 bnep rfcomm bluetooth rpcsec_gss_krb5 nfsv4 dm_crypt nfsd auth_rpcgss nfs_acl nfs lockd binfmt_misc grace sunrpc fscache ir_lirc_codec ir_xmp_decoder ir_sharp_decoder lirc_dev ir_mce_kbd_decoder ir_sony_decoder ir_sanyo_decoder ir_rc6_decoder ir_jvc_decoder ir_nec_decoder ir_rc5_decoder rc_rc6_mce pl2303 mceusb rc_core usbserial uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core v4l2_common snd_hda_codec_realtek snd_hda_codec_generic videodev snd_hda_intel snd_usb_audio snd_hda_controller snd_hda_codec media snd_usbmidi_lib snd_hwdep joydev snd_pcm coretemp snd_seq_midi snd_seq_midi_event kvm_intel snd_rawmidi kvm snd_seq snd_seq_device snd_timer snd soundcore serio_raw parport_pc lpc_ich ppdev lp mac_hid parport hid_generic psmouse e1000e pata_acpi i915 usbhid hid video i2c_algo_bit drm_kms_helper drm firewire_ohci firewire_core ptp crc_itu_t pps_core
Jan 15 19:29:14 minipc kernel: [  373.261609] CPU: 1 PID: 3451 Comm: MediaManager Tainted: G        W      3.19.0-031900rc4-lowlatency #201501112135
Jan 15 19:29:14 minipc kernel: [  373.261611] Hardware name: AOpen i965GMx-IF/i965GMx-IF, BIOS 6.00 PG 10/03/2008
Jan 15 19:29:14 minipc kernel: [  373.261612]  00000000000000db ffff8800738dfb88 ffffffff817c94ae 0000000000000007
Jan 15 19:29:14 minipc kernel: [  373.261615]  ffff8800738dfbd8 ffff8800738dfbc8 ffffffff81078657 ffff8800738dfbb8
Jan 15 19:29:14 minipc kernel: [  373.261618]  ffffffff81cd02a0 ffff8800c9a8f258 0000000000000000 ffffffff81cd0180
Jan 15 19:29:14 minipc kernel: [  373.261621] Call Trace:
Jan 15 19:29:14 minipc kernel: [  373.261624]  [<ffffffff817c94ae>] dump_stack+0x4c/0x6e
Jan 15 19:29:14 minipc kernel: [  373.261628]  [<ffffffff81078657>] warn_slowpath_common+0x97/0xe0
Jan 15 19:29:14 minipc kernel: [  373.261631]  [<ffffffff81078756>] warn_slowpath_fmt+0x46/0x50
Jan 15 19:29:14 minipc kernel: [  373.261634]  [<ffffffff8126e2e3>] ? kernfs_find_and_get_ns+0x53/0x70
Jan 15 19:29:14 minipc kernel: [  373.261637]  [<ffffffff81272533>] sysfs_remove_group+0xa3/0xb0
Jan 15 19:29:14 minipc kernel: [  373.261640]  [<ffffffff8127257b>] sysfs_remove_groups+0x3b/0x60
Jan 15 19:29:14 minipc kernel: [  373.261643]  [<ffffffff814f6acb>] device_remove_attrs+0x5b/0x80
Jan 15 19:29:14 minipc kernel: [  373.261646]  [<ffffffff814f6ee0>] device_del+0x120/0x230
Jan 15 19:29:14 minipc kernel: [  373.261649]  [<ffffffff810b9523>] ? __wake_up+0x53/0x70
Jan 15 19:29:14 minipc kernel: [  373.261652]  [<ffffffff81610419>] __input_unregister_device+0x149/0x170
Jan 15 19:29:14 minipc kernel: [  373.261655]  [<ffffffff81610495>] input_unregister_device+0x55/0x80
Jan 15 19:29:14 minipc kernel: [  373.261661]  [<ffffffffc07fd176>] uvc_status_cleanup+0x46/0x50 [uvcvideo]
Jan 15 19:29:14 minipc kernel: [  373.261667]  [<ffffffffc07f2318>] uvc_delete+0x18/0x160 [uvcvideo]
Jan 15 19:29:14 minipc kernel: [  373.261672]  [<ffffffffc07f2555>] uvc_release+0x25/0x30 [uvcvideo]
Jan 15 19:29:14 minipc kernel: [  373.261680]  [<ffffffffc0794986>] v4l2_device_release+0xe6/0x120 [videodev]
Jan 15 19:29:14 minipc kernel: [  373.261683]  [<ffffffff814f657e>] device_release+0x3e/0xc0
Jan 15 19:29:14 minipc kernel: [  373.261689]  [<ffffffffc07f5793>] ? uvc_v4l2_release+0x63/0x110 [uvcvideo]
Jan 15 19:29:14 minipc kernel: [  373.261692]  [<ffffffff813ad902>] kobject_cleanup+0x82/0x1c0
Jan 15 19:29:14 minipc kernel: [  373.261694]  [<ffffffff813ad790>] kobject_put+0x30/0x70
Jan 15 19:29:14 minipc kernel: [  373.261697]  [<ffffffff814f6247>] put_device+0x17/0x20
Jan 15 19:29:14 minipc kernel: [  373.261704]  [<ffffffffc07934aa>] v4l2_release+0x5a/0x90 [videodev]
Jan 15 19:29:14 minipc kernel: [  373.261707]  [<ffffffff811faad4>] __fput+0xb4/0x240
Jan 15 19:29:14 minipc kernel: [  373.261710]  [<ffffffff811facae>] ____fput+0xe/0x10
Jan 15 19:29:14 minipc kernel: [  373.261713]  [<ffffffff8109542f>] task_work_run+0xaf/0xf0
Jan 15 19:29:14 minipc kernel: [  373.261716]  [<ffffffff81017107>] do_notify_resume+0xc7/0xd0
Jan 15 19:29:14 minipc kernel: [  373.261719]  [<ffffffff817d5e8f>] int_signal+0x12/0x17
Jan 15 19:29:14 minipc kernel: [  373.261721] ---[ end trace 91c8a7ab90795726 ]---
Jan 15 19:29:14 minipc kernel: [  373.261802] ------------[ cut here ]------------
Jan 15 19:29:14 minipc kernel: [  373.261806] WARNING: CPU: 1 PID: 3451 at /home/apw/COD/linux/fs/sysfs/group.c:219 sysfs_remove_group+0xa3/0xb0()
Jan 15 19:29:14 minipc kernel: [  373.261808] sysfs group ffffffff81cb7260 not found for kobject 'media0'
Jan 15 19:29:14 minipc kernel: [  373.261809] 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 bnep rfcomm bluetooth rpcsec_gss_krb5 nfsv4 dm_crypt nfsd auth_rpcgss nfs_acl nfs lockd binfmt_misc grace sunrpc fscache ir_lirc_codec ir_xmp_decoder ir_sharp_decoder lirc_dev ir_mce_kbd_decoder ir_sony_decoder ir_sanyo_decoder ir_rc6_decoder ir_jvc_decoder ir_nec_decoder ir_rc5_decoder rc_rc6_mce pl2303 mceusb rc_core usbserial uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core v4l2_common snd_hda_codec_realtek snd_hda_codec_generic videodev snd_hda_intel snd_usb_audio snd_hda_controller snd_hda_codec media snd_usbmidi_lib snd_hwdep joydev snd_pcm coretemp snd_seq_midi snd_seq_midi_event kvm_intel snd_rawmidi kvm snd_seq snd_seq_device snd_timer snd soundcore serio_raw parport_pc lpc_ich ppdev lp mac_hid parport hid_generic psmouse e1000e pata_acpi i915 usbhid hid video i2c_algo_bit drm_kms_helper drm firewire_ohci firewire_core ptp crc_itu_t pps_core
Jan 15 19:29:14 minipc kernel: [  373.261884] CPU: 1 PID: 3451 Comm: MediaManager Tainted: G        W      3.19.0-031900rc4-lowlatency #201501112135
Jan 15 19:29:14 minipc kernel: [  373.261886] Hardware name: AOpen i965GMx-IF/i965GMx-IF, BIOS 6.00 PG 10/03/2008
Jan 15 19:29:14 minipc kernel: [  373.261887]  00000000000000db ffff8800738dfbc8 ffffffff817c94ae 0000000000000007
Jan 15 19:29:14 minipc kernel: [  373.261890]  ffff8800738dfc18 ffff8800738dfc08 ffffffff81078657 ffff8800738dfbf8
Jan 15 19:29:14 minipc kernel: [  373.261893]  ffffffff81cb7260 ffff880129913898 0000000000000000 ffff88012a5287a0
Jan 15 19:29:14 minipc kernel: [  373.261896] Call Trace:
Jan 15 19:29:14 minipc kernel: [  373.261899]  [<ffffffff817c94ae>] dump_stack+0x4c/0x6e
Jan 15 19:29:14 minipc kernel: [  373.261903]  [<ffffffff81078657>] warn_slowpath_common+0x97/0xe0
Jan 15 19:29:14 minipc kernel: [  373.261906]  [<ffffffff81078756>] warn_slowpath_fmt+0x46/0x50
Jan 15 19:29:14 minipc kernel: [  373.261909]  [<ffffffff8126e2e3>] ? kernfs_find_and_get_ns+0x53/0x70
Jan 15 19:29:14 minipc kernel: [  373.261912]  [<ffffffff81272533>] sysfs_remove_group+0xa3/0xb0
Jan 15 19:29:14 minipc kernel: [  373.261915]  [<ffffffff81502e69>] dpm_sysfs_remove+0x59/0x70
Jan 15 19:29:14 minipc kernel: [  373.261918]  [<ffffffff814f6e16>] device_del+0x56/0x230
Jan 15 19:29:14 minipc kernel: [  373.261922]  [<ffffffff814f7012>] device_unregister+0x22/0x60
Jan 15 19:29:14 minipc kernel: [  373.261929]  [<ffffffffc0713055>] media_devnode_unregister+0x45/0x50 [media]
Jan 15 19:29:14 minipc kernel: [  373.261935]  [<ffffffffc07122bd>] media_device_unregister+0x5d/0x70 [media]
Jan 15 19:29:14 minipc kernel: [  373.261940]  [<ffffffffc07f2451>] uvc_delete+0x151/0x160 [uvcvideo]
Jan 15 19:29:14 minipc kernel: [  373.261946]  [<ffffffffc07f2555>] uvc_release+0x25/0x30 [uvcvideo]
Jan 15 19:29:14 minipc kernel: [  373.261953]  [<ffffffffc0794986>] v4l2_device_release+0xe6/0x120 [videodev]
Jan 15 19:29:14 minipc kernel: [  373.261957]  [<ffffffff814f657e>] device_release+0x3e/0xc0
Jan 15 19:29:14 minipc kernel: [  373.261962]  [<ffffffffc07f5793>] ? uvc_v4l2_release+0x63/0x110 [uvcvideo]
Jan 15 19:29:14 minipc kernel: [  373.261965]  [<ffffffff813ad902>] kobject_cleanup+0x82/0x1c0
Jan 15 19:29:14 minipc kernel: [  373.261968]  [<ffffffff813ad790>] kobject_put+0x30/0x70
Jan 15 19:29:14 minipc kernel: [  373.261971]  [<ffffffff814f6247>] put_device+0x17/0x20
Jan 15 19:29:14 minipc kernel: [  373.261978]  [<ffffffffc07934aa>] v4l2_release+0x5a/0x90 [videodev]
Jan 15 19:29:14 minipc kernel: [  373.261981]  [<ffffffff811faad4>] __fput+0xb4/0x240
Jan 15 19:29:14 minipc kernel: [  373.261984]  [<ffffffff811facae>] ____fput+0xe/0x10
Jan 15 19:29:14 minipc kernel: [  373.261987]  [<ffffffff8109542f>] task_work_run+0xaf/0xf0
Jan 15 19:29:14 minipc kernel: [  373.261990]  [<ffffffff81017107>] do_notify_resume+0xc7/0xd0
Jan 15 19:29:14 minipc kernel: [  373.261993]  [<ffffffff817d5e8f>] int_signal+0x12/0x17
Jan 15 19:29:14 minipc kernel: [  373.261995] ---[ end trace 91c8a7ab90795727 ]---



Note that relaunching firefox Hello make the webcam work again then stops and crashes appear upon disconecting application.

Thus this is always reproducible.