I just noticed the following em28xx bug: Steps to reproduce: 1) open device with qv4l2 2) start streaming 3) unplugg the device 4) close qv4l2 Result: [19188.227756] ------------[ cut here ]------------ [19188.227766] WARNING: CPU: 0 PID: 12773 at fs/sysfs/group.c:214 sysfs_remove_group+0xc9/0xd0() [19188.227769] sysfs group c0a10100 not found for kobject 'vbi1' [19188.227771] Modules linked in: tuner_xc2028(O) em28xx_rc zl10353 em28xx_dvb dvb_core snd_usb_audio snd_usbmidi_lib snd_rawmidi tvp5150 em28xx videobuf2_core videobuf2_vmalloc videobuf2_memops xt_tcpudp xt_pkttype af_packet xt_LOG xt_limit ip6t_REJECT nf_conntrack_ipv6 nf_defrag_ipv6 ip6table_raw ipt_REJECT iptable_raw xt_CT iptable_filter ip6table_mangle nf_conntrack_netbios_ns nf_conntrack_broadcast nf_conntrack_ipv4 nf_defrag_ipv4 ip_tables xt_conntrack nf_conntrack ip6table_filter ip6_tables x_tables fuse arc4 rtl8187 mac80211 snd_hda_codec_hdmi snd_hda_codec_analog snd_hda_intel snd_hda_codec rc_hauppauge ir_kbd_i2c snd_hwdep cfg80211 tuner_simple tuner_types snd_pcm tda9887 tda8290 rfkill usb_storage snd_seq usblp tuner msp3400 eeprom_93cx6 bttv snd_timer snd_seq_device v4l2_common videodev snd videobuf_dma_sg videobuf_core firewire_ohci sg btcx_risc firewire_core sr_mod cdrom soundcore snd_page_alloc rc_core tveeprom forcedeth k8temp serio_raw shpchp crc_itu_t i2c_nforce2 powernow_k8 pcspkr kvm_amd kvm ppdev parport_pc parport floppy asus_atk0110 button autofs4 radeon ttm drm_kms_helper drm i2c_algo_bit thermal fan processor thermal_sys scsi_dh_alua scsi_dh_hp_sw scsi_dh_emc scsi_dh_rdac scsi_dh ata_generic pata_amd pata_jmicron sata_nv [last unloaded: tuner_xc2028] [19188.227858] CPU: 0 PID: 12773 Comm: qv4l2 Tainted: G O 3.13.0-rc5-0.1-desktop+ #58 [19188.227861] Hardware name: System manufacturer System Product Name/M2N-VM DH, BIOS ASUS M2N-VM DH ACPI BIOS Revision 1503 09/16/2010 [19188.227863] 00000000 00000000 d876be38 c077957b d876be78 d876be68 c02401bf c092ae20 [19188.227871] d876be94 000031e5 c0934ca6 000000d6 c03afec9 c03afec9 00000000 c0a10100 [19188.227877] d853d80c d876be80 c024025e 00000009 d876be78 c092ae20 d876be94 d876bea8 [19188.227883] Call Trace: [19188.227890] [<c077957b>] dump_stack+0x48/0x69 [19188.227895] [<c02401bf>] warn_slowpath_common+0x7f/0xa0 [19188.227900] [<c03afec9>] ? sysfs_remove_group+0xc9/0xd0 [19188.227904] [<c03afec9>] ? sysfs_remove_group+0xc9/0xd0 [19188.227908] [<c024025e>] warn_slowpath_fmt+0x2e/0x30 [19188.227912] [<c03afec9>] sysfs_remove_group+0xc9/0xd0 [19188.227918] [<c059c26d>] dpm_sysfs_remove+0x2d/0x30 [19188.227922] [<c0593fec>] device_del+0x2c/0x150 [19188.227926] [<c059412c>] device_unregister+0x1c/0x60 [19188.227929] [<c07761ea>] ? printk+0x48/0x4a [19188.227943] [<f95126e8>] video_unregister_device+0x38/0x40 [videodev] [19188.227952] [<f9bf28a4>] em28xx_release_analog_resources+0xc4/0x100 [em28xx] [19188.227959] [<f9bf572b>] em28xx_release_resources+0xb/0x70 [em28xx] [19188.227964] [<f9bf0c6f>] em28xx_v4l2_close+0xcf/0x150 [em28xx] [19188.227974] [<f951302e>] v4l2_release+0x2e/0x70 [videodev] [19188.227980] [<c034df1b>] __fput+0xab/0x1d0 [19188.227984] [<c034e078>] ____fput+0x8/0x10 [19188.227989] [<c025a6e9>] task_work_run+0x79/0x90 [19188.227994] [<c0202141>] do_notify_resume+0x51/0x80 [19188.227998] [<c077fd1b>] work_notifysig+0x24/0x29 [19188.228028] ---[ end trace e8fa0efd13bec3a1 ]--- [19188.228132] em2882/3 #0: V4L2 device video1 deregistered [19188.228142] ------------[ cut here ]------------ [19188.228155] WARNING: CPU: 0 PID: 12773 at fs/sysfs/group.c:214 sysfs_remove_group+0xc9/0xd0() [19188.228165] sysfs group c0a10100 not found for kobject 'video1' [19188.228175] Modules linked in: tuner_xc2028(O) em28xx_rc zl10353 em28xx_dvb dvb_core snd_usb_audio snd_usbmidi_lib snd_rawmidi tvp5150 em28xx videobuf2_core videobuf2_vmalloc videobuf2_memops xt_tcpudp xt_pkttype af_packet xt_LOG xt_limit ip6t_REJECT nf_conntrack_ipv6 nf_defrag_ipv6 ip6table_raw ipt_REJECT iptable_raw xt_CT iptable_filter ip6table_mangle nf_conntrack_netbios_ns nf_conntrack_broadcast nf_conntrack_ipv4 nf_defrag_ipv4 ip_tables xt_conntrack nf_conntrack ip6table_filter ip6_tables x_tables fuse arc4 rtl8187 mac80211 snd_hda_codec_hdmi snd_hda_codec_analog snd_hda_intel snd_hda_codec rc_hauppauge ir_kbd_i2c snd_hwdep cfg80211 tuner_simple tuner_types snd_pcm tda9887 tda8290 rfkill usb_storage snd_seq usblp tuner msp3400 eeprom_93cx6 bttv snd_timer snd_seq_device v4l2_common videodev snd videobuf_dma_sg videobuf_core firewire_ohci sg btcx_risc firewire_core sr_mod cdrom soundcore snd_page_alloc rc_core tveeprom forcedeth k8temp serio_raw shpchp crc_itu_t i2c_nforce2 powernow_k8 pcspkr kvm_amd kvm ppdev parport_pc parport floppy asus_atk0110 button autofs4 radeon ttm drm_kms_helper drm i2c_algo_bit thermal fan processor thermal_sys scsi_dh_alua scsi_dh_hp_sw scsi_dh_emc scsi_dh_rdac scsi_dh ata_generic pata_amd pata_jmicron sata_nv [last unloaded: tuner_xc2028] [19188.228250] CPU: 0 PID: 12773 Comm: qv4l2 Tainted: G W O 3.13.0-rc5-0.1-desktop+ #58 [19188.228253] Hardware name: System manufacturer System Product Name/M2N-VM DH, BIOS ASUS M2N-VM DH ACPI BIOS Revision 1503 09/16/2010 [19188.228255] 00000000 00000000 d876be38 c077957b d876be78 d876be68 c02401bf c092ae20 [19188.228261] d876be94 000031e5 c0934ca6 000000d6 c03afec9 c03afec9 00000000 c0a10100 [19188.228266] d9f9f40c d876be80 c024025e 00000009 d876be78 c092ae20 d876be94 d876bea8 [19188.228272] Call Trace: [19188.228286] [<c077957b>] dump_stack+0x48/0x69 [19188.228297] [<c02401bf>] warn_slowpath_common+0x7f/0xa0 [19188.228302] [<c03afec9>] ? sysfs_remove_group+0xc9/0xd0 [19188.228306] [<c03afec9>] ? sysfs_remove_group+0xc9/0xd0 [19188.228310] [<c024025e>] warn_slowpath_fmt+0x2e/0x30 [19188.228314] [<c03afec9>] sysfs_remove_group+0xc9/0xd0 [19188.228318] [<c059c26d>] dpm_sysfs_remove+0x2d/0x30 [19188.228322] [<c0593fec>] device_del+0x2c/0x150 [19188.228332] [<c059412c>] device_unregister+0x1c/0x60 [19188.228342] [<c07761ea>] ? printk+0x48/0x4a [19188.228353] [<f95126e8>] video_unregister_device+0x38/0x40 [videodev] [19188.228359] [<f9bf2867>] em28xx_release_analog_resources+0x87/0x100 [em28xx] [19188.228366] [<f9bf572b>] em28xx_release_resources+0xb/0x70 [em28xx] [19188.228378] [<f9bf0c6f>] em28xx_v4l2_close+0xcf/0x150 [em28xx] [19188.228388] [<f951302e>] v4l2_release+0x2e/0x70 [videodev] [19188.228397] [<c034df1b>] __fput+0xab/0x1d0 [19188.228401] [<c034e078>] ____fput+0x8/0x10 [19188.228410] [<c025a6e9>] task_work_run+0x79/0x90 [19188.228413] [<c0202141>] do_notify_resume+0x51/0x80 [19188.228421] [<c077fd1b>] work_notifysig+0x24/0x29 [19188.228424] ---[ end trace e8fa0efd13bec3a2 ]--- [19188.228460] ------------[ cut here ]------------ [19188.228465] WARNING: CPU: 0 PID: 12773 at fs/sysfs/group.c:214 sysfs_remove_group+0xc9/0xd0() [19188.228468] sysfs group c0a10100 not found for kobject '10-005c' [19188.228469] Modules linked in: tuner_xc2028(O) em28xx_rc zl10353 em28xx_dvb dvb_core snd_usb_audio snd_usbmidi_lib snd_rawmidi tvp5150 em28xx videobuf2_core videobuf2_vmalloc videobuf2_memops xt_tcpudp xt_pkttype af_packet xt_LOG xt_limit ip6t_REJECT nf_conntrack_ipv6 nf_defrag_ipv6 ip6table_raw ipt_REJECT iptable_raw xt_CT iptable_filter ip6table_mangle nf_conntrack_netbios_ns nf_conntrack_broadcast nf_conntrack_ipv4 nf_defrag_ipv4 ip_tables xt_conntrack nf_conntrack ip6table_filter ip6_tables x_tables fuse arc4 rtl8187 mac80211 snd_hda_codec_hdmi snd_hda_codec_analog snd_hda_intel snd_hda_codec rc_hauppauge ir_kbd_i2c snd_hwdep cfg80211 tuner_simple tuner_types snd_pcm tda9887 tda8290 rfkill usb_storage snd_seq usblp tuner msp3400 eeprom_93cx6 bttv snd_timer snd_seq_device v4l2_common videodev snd videobuf_dma_sg videobuf_core firewire_ohci sg btcx_risc firewire_core sr_mod cdrom soundcore snd_page_alloc rc_core tveeprom forcedeth k8temp serio_raw shpchp crc_itu_t i2c_nforce2 powernow_k8 pcspkr kvm_amd kvm ppdev parport_pc parport floppy asus_atk0110 button autofs4 radeon ttm drm_kms_helper drm i2c_algo_bit thermal fan processor thermal_sys scsi_dh_alua scsi_dh_hp_sw scsi_dh_emc scsi_dh_rdac scsi_dh ata_generic pata_amd pata_jmicron sata_nv [last unloaded: tuner_xc2028] [19188.228534] CPU: 0 PID: 12773 Comm: qv4l2 Tainted: G W O 3.13.0-rc5-0.1-desktop+ #58 [19188.228536] Hardware name: System manufacturer System Product Name/M2N-VM DH, BIOS ASUS M2N-VM DH ACPI BIOS Revision 1503 09/16/2010 [19188.228538] 00000000 00000000 d876bde8 c077957b d876be28 d876be18 c02401bf c092ae20 [19188.228544] d876be44 000031e5 c0934ca6 000000d6 c03afec9 c03afec9 00000000 c0a10100 [19188.228550] d8e00624 d876be30 c024025e 00000009 d876be28 c092ae20 d876be44 d876be58 [19188.228555] Call Trace: [19188.228559] [<c077957b>] dump_stack+0x48/0x69 [19188.228563] [<c02401bf>] warn_slowpath_common+0x7f/0xa0 [19188.228568] [<c03afec9>] ? sysfs_remove_group+0xc9/0xd0 [19188.228572] [<c03afec9>] ? sysfs_remove_group+0xc9/0xd0 [19188.228576] [<c024025e>] warn_slowpath_fmt+0x2e/0x30 [19188.228580] [<c03afec9>] sysfs_remove_group+0xc9/0xd0 [19188.228584] [<c059c26d>] dpm_sysfs_remove+0x2d/0x30 [19188.228587] [<c0593fec>] device_del+0x2c/0x150 [19188.228592] [<c064b7d0>] ? __unregister_dummy+0x30/0x30 [19188.228595] [<c059412c>] device_unregister+0x1c/0x60 [19188.228599] [<c064b4eb>] i2c_unregister_device+0xb/0x10 [19188.228603] [<c064b803>] __unregister_client+0x33/0x40 [19188.228606] [<c05935fc>] device_for_each_child+0x2c/0x60 [19188.228610] [<c064ca88>] i2c_del_adapter+0x158/0x2c0 [19188.228614] [<c064b790>] ? __process_removed_driver+0x30/0x30 [19188.228617] [<c07761ea>] ? printk+0x48/0x4a [19188.228625] [<f9bf42b7>] em28xx_i2c_unregister+0x17/0x30 [em28xx] [19188.228631] [<f9bf573e>] em28xx_release_resources+0x1e/0x70 [em28xx] [19188.228636] [<f9bf0c6f>] em28xx_v4l2_close+0xcf/0x150 [em28xx] [19188.228647] [<f951302e>] v4l2_release+0x2e/0x70 [videodev] [19188.228651] [<c034df1b>] __fput+0xab/0x1d0 [19188.228656] [<c034e078>] ____fput+0x8/0x10 [19188.228660] [<c025a6e9>] task_work_run+0x79/0x90 [19188.228663] [<c0202141>] do_notify_resume+0x51/0x80 [19188.228667] [<c077fd1b>] work_notifysig+0x24/0x29 [19188.228670] ---[ end trace e8fa0efd13bec3a3 ]--- [19188.228695] ------------[ cut here ]------------ [19188.228700] WARNING: CPU: 0 PID: 12773 at fs/sysfs/group.c:214 sysfs_remove_group+0xc9/0xd0() [19188.228702] sysfs group c0a10100 not found for kobject '10-0061' [19188.228704] Modules linked in: tuner_xc2028(O) em28xx_rc zl10353 em28xx_dvb dvb_core snd_usb_audio snd_usbmidi_lib snd_rawmidi tvp5150 em28xx videobuf2_core videobuf2_vmalloc videobuf2_memops xt_tcpudp xt_pkttype af_packet xt_LOG xt_limit ip6t_REJECT nf_conntrack_ipv6 nf_defrag_ipv6 ip6table_raw ipt_REJECT iptable_raw xt_CT iptable_filter ip6table_mangle nf_conntrack_netbios_ns nf_conntrack_broadcast nf_conntrack_ipv4 nf_defrag_ipv4 ip_tables xt_conntrack nf_conntrack ip6table_filter ip6_tables x_tables fuse arc4 rtl8187 mac80211 snd_hda_codec_hdmi snd_hda_codec_analog snd_hda_intel snd_hda_codec rc_hauppauge ir_kbd_i2c snd_hwdep cfg80211 tuner_simple tuner_types snd_pcm tda9887 tda8290 rfkill usb_storage snd_seq usblp tuner msp3400 eeprom_93cx6 bttv snd_timer snd_seq_device v4l2_common videodev snd videobuf_dma_sg videobuf_core firewire_ohci sg btcx_risc firewire_core sr_mod cdrom soundcore snd_page_alloc rc_core tveeprom forcedeth k8temp serio_raw shpchp crc_itu_t i2c_nforce2 powernow_k8 pcspkr kvm_amd kvm ppdev parport_pc parport floppy asus_atk0110 button autofs4 radeon ttm drm_kms_helper drm i2c_algo_bit thermal fan processor thermal_sys scsi_dh_alua scsi_dh_hp_sw scsi_dh_emc scsi_dh_rdac scsi_dh ata_generic pata_amd pata_jmicron sata_nv [last unloaded: tuner_xc2028] [19188.228768] CPU: 0 PID: 12773 Comm: qv4l2 Tainted: G W O 3.13.0-rc5-0.1-desktop+ #58 [19188.228770] Hardware name: System manufacturer System Product Name/M2N-VM DH, BIOS ASUS M2N-VM DH ACPI BIOS Revision 1503 09/16/2010 [19188.228772] 00000000 00000000 d876bde8 c077957b d876be28 d876be18 c02401bf c092ae20 [19188.228778] d876be44 000031e5 c0934ca6 000000d6 c03afec9 c03afec9 00000000 c0a10100 [19188.228783] f6aeac24 d876be30 c024025e 00000009 d876be28 c092ae20 d876be44 d876be58 [19188.228789] Call Trace: [19188.228793] [<c077957b>] dump_stack+0x48/0x69 [19188.228797] [<c02401bf>] warn_slowpath_common+0x7f/0xa0 [19188.228801] [<c03afec9>] ? sysfs_remove_group+0xc9/0xd0 [19188.228805] [<c03afec9>] ? sysfs_remove_group+0xc9/0xd0 [19188.228809] [<c024025e>] warn_slowpath_fmt+0x2e/0x30 [19188.228813] [<c03afec9>] sysfs_remove_group+0xc9/0xd0 [19188.228817] [<c059c26d>] dpm_sysfs_remove+0x2d/0x30 [19188.228820] [<c0593fec>] device_del+0x2c/0x150 [19188.228824] [<c064b7d0>] ? __unregister_dummy+0x30/0x30 [19188.228828] [<c059412c>] device_unregister+0x1c/0x60 [19188.228831] [<c059333f>] ? put_device+0xf/0x20 [19188.228834] [<c059335b>] ? klist_children_put+0xb/0x10 [19188.228838] [<c064b4eb>] i2c_unregister_device+0xb/0x10 [19188.228841] [<c064b803>] __unregister_client+0x33/0x40 [19188.228845] [<c05935fc>] device_for_each_child+0x2c/0x60 [19188.228849] [<c064ca88>] i2c_del_adapter+0x158/0x2c0 [19188.228853] [<c064b790>] ? __process_removed_driver+0x30/0x30 [19188.228856] [<c07761ea>] ? printk+0x48/0x4a [19188.228863] [<f9bf42b7>] em28xx_i2c_unregister+0x17/0x30 [em28xx] [19188.228868] [<f9bf573e>] em28xx_release_resources+0x1e/0x70 [em28xx] [19188.228873] [<f9bf0c6f>] em28xx_v4l2_close+0xcf/0x150 [em28xx] [19188.228884] [<f951302e>] v4l2_release+0x2e/0x70 [videodev] [19188.228890] [<c034df1b>] __fput+0xab/0x1d0 [19188.228894] [<c034e078>] ____fput+0x8/0x10 [19188.228910] [<c025a6e9>] task_work_run+0x79/0x90 [19188.228913] [<c0202141>] do_notify_resume+0x51/0x80 [19188.228915] [<c077fd1b>] work_notifysig+0x24/0x29 [19188.228917] ---[ end trace e8fa0efd13bec3a4 ]--- [19188.228930] xc2028 10-0061: destroying instance [19188.228945] ------------[ cut here ]------------ [19188.228948] WARNING: CPU: 0 PID: 12773 at fs/sysfs/group.c:214 sysfs_remove_group+0xc9/0xd0() [19188.228949] sysfs group c0a10100 not found for kobject 'i2c-10' [19188.228974] Modules linked in: tuner_xc2028(O) em28xx_rc zl10353 em28xx_dvb dvb_core snd_usb_audio snd_usbmidi_lib snd_rawmidi tvp5150 em28xx videobuf2_core videobuf2_vmalloc videobuf2_memops xt_tcpudp xt_pkttype af_packet xt_LOG xt_limit ip6t_REJECT nf_conntrack_ipv6 nf_defrag_ipv6 ip6table_raw ipt_REJECT iptable_raw xt_CT iptable_filter ip6table_mangle nf_conntrack_netbios_ns nf_conntrack_broadcast nf_conntrack_ipv4 nf_defrag_ipv4 ip_tables xt_conntrack nf_conntrack ip6table_filter ip6_tables x_tables fuse arc4 rtl8187 mac80211 snd_hda_codec_hdmi snd_hda_codec_analog snd_hda_intel snd_hda_codec rc_hauppauge ir_kbd_i2c snd_hwdep cfg80211 tuner_simple tuner_types snd_pcm tda9887 tda8290 rfkill usb_storage snd_seq usblp tuner msp3400 eeprom_93cx6 bttv snd_timer snd_seq_device v4l2_common videodev snd videobuf_dma_sg videobuf_core firewire_ohci sg btcx_risc firewire_core sr_mod cdrom soundcore snd_page_alloc rc_core tveeprom forcedeth k8temp serio_raw shpchp crc_itu_t i2c_nforce2 powernow_k8 pcspkr kvm_amd kvm ppdev parport_pc parport floppy asus_atk0110 button autofs4 radeon ttm drm_kms_helper drm i2c_algo_bit thermal fan processor thermal_sys scsi_dh_alua scsi_dh_hp_sw scsi_dh_emc scsi_dh_rdac scsi_dh ata_generic pata_amd pata_jmicron sata_nv [last unloaded: tuner_xc2028] [19188.228995] CPU: 0 PID: 12773 Comm: qv4l2 Tainted: G W O 3.13.0-rc5-0.1-desktop+ #58 [19188.228996] Hardware name: System manufacturer System Product Name/M2N-VM DH, BIOS ASUS M2N-VM DH ACPI BIOS Revision 1503 09/16/2010 [19188.229018] 00000000 00000000 d876be18 c077957b d876be58 d876be48 c02401bf c092ae20 [19188.229022] d876be74 000031e5 c0934ca6 000000d6 c03afec9 c03afec9 00000000 c0a10100 [19188.229026] eed2e220 d876be60 c024025e 00000009 d876be58 c092ae20 d876be74 d876be88 [19188.229026] Call Trace: [19188.229029] [<c077957b>] dump_stack+0x48/0x69 [19188.229032] [<c02401bf>] warn_slowpath_common+0x7f/0xa0 [19188.229035] [<c03afec9>] ? sysfs_remove_group+0xc9/0xd0 [19188.229038] [<c03afec9>] ? sysfs_remove_group+0xc9/0xd0 [19188.229040] [<c024025e>] warn_slowpath_fmt+0x2e/0x30 [19188.229043] [<c03afec9>] sysfs_remove_group+0xc9/0xd0 [19188.229045] [<c059c26d>] dpm_sysfs_remove+0x2d/0x30 [19188.229048] [<c0593fec>] device_del+0x2c/0x150 [19188.229050] [<c059412c>] device_unregister+0x1c/0x60 [19188.229052] [<c03af3f1>] ? sysfs_remove_link+0x11/0x30 [19188.229055] [<c0597b9f>] ? class_compat_remove_link+0x2f/0x50 [19188.229058] [<c064cae4>] i2c_del_adapter+0x1b4/0x2c0 [19188.229061] [<c064b790>] ? __process_removed_driver+0x30/0x30 [19188.229062] [<c07761ea>] ? printk+0x48/0x4a [19188.229068] [<f9bf42b7>] em28xx_i2c_unregister+0x17/0x30 [em28xx] [19188.229073] [<f9bf573e>] em28xx_release_resources+0x1e/0x70 [em28xx] [19188.229077] [<f9bf0c6f>] em28xx_v4l2_close+0xcf/0x150 [em28xx] [19188.229086] [<f951302e>] v4l2_release+0x2e/0x70 [videodev] [19188.229089] [<c034df1b>] __fput+0xab/0x1d0 [19188.229092] [<c034e078>] ____fput+0x8/0x10 [19188.229095] [<c025a6e9>] task_work_run+0x79/0x90 [19188.229097] [<c0202141>] do_notify_resume+0x51/0x80 [19188.229100] [<c077fd1b>] work_notifysig+0x24/0x29 [19188.229101] ---[ end trace e8fa0efd13bec3a5 ]--- It also occurs with the latest em28xx-experimental code (analog support moved to it's own separate module). Regards, Frank -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
