Description of problem: When I disconnect USB stick I see this messages in kernel log [ 332.339452] usb 3-3.4: USB disconnect, device number 6 [ 332.356005] ------------[ cut here ]------------ [ 332.356020] WARNING: CPU: 6 PID: 2662 at fs/sysfs/group.c:214 sysfs_remove_group+0xc6/0xd0() [ 332.356021] sysfs group ffffffff81cb06e0 not found for kobject 'target7:0:0' [ 332.356022] Modules linked in: rfcomm nls_utf8 isofs fuse joydev hid_logitech_dj btusb ip6t_rpfilter bnep bluetooth ip6t_REJECT xt_conntrack cfg80211 rfkill ebtable_nat ebtable_broute bridge usb_storage stp llc ebtable_filter ebtables ip6table_nat nf_conntrack_ipv6 nf_defrag_ipv6 nf_nat_ipv6 ip6table_mangle ip6table_security ip6table_raw ip6table_filter ip6_tables iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack iptable_mangle iptable_security iptable_raw iTCO_wdt iTCO_vendor_support ppdev snd_hda_codec_ca0132 vfat fat x86_pkg_temp_thermal coretemp snd_hda_codec_realtek kvm_intel kvm crct10dif_pclmul crc32_pclmul snd_hda_codec_hdmi crc32c_intel snd_hda_intel snd_hda_codec ghash_clmulni_intel snd_hwdep snd_seq microcode snd_seq_device snd_pcm i2c_i801 snd_page_alloc serio_raw [ 332.356054] r8169 lpc_ich snd_timer mfd_core mii snd mei_me mei shpchp soundcore parport_pc parport binfmt_misc i915 i2c_algo_bit drm_kms_helper drm i2c_core video [ 332.356062] CPU: 6 PID: 2662 Comm: umount Not tainted 3.13.5-201.fc20.x86_64 #1 [ 332.356063] Hardware name: Gigabyte Technology Co., Ltd. Z87M-D3H/Z87M-D3H, BIOS F9 01/20/2014 [ 332.356063] 0000000000000009 ffff8807cd6fbb70 ffffffff81686fdc ffff8807cd6fbbb8 [ 332.356065] ffff8807cd6fbba8 ffffffff8106d47d 0000000000000000 ffffffff81cb06e0 [ 332.356066] ffff880810be2038 ffff880811655188 ffff8807fae35900 ffff8807cd6fbc08 [ 332.356068] Call Trace: [ 332.356072] [<ffffffff81686fdc>] dump_stack+0x45/0x56 [ 332.356075] [<ffffffff8106d47d>] warn_slowpath_common+0x7d/0xa0 [ 332.356077] [<ffffffff8106d4ec>] warn_slowpath_fmt+0x4c/0x50 [ 332.356078] [<ffffffff81230afe>] ? sysfs_get_dirent_ns+0x4e/0x70 [ 332.356079] [<ffffffff81231dc6>] sysfs_remove_group+0xc6/0xd0 [ 332.356082] [<ffffffff8141dc03>] dpm_sysfs_remove+0x43/0x50 [ 332.356084] [<ffffffff81413955>] device_del+0x45/0x1c0 [ 332.356086] [<ffffffff8143eb87>] scsi_target_reap_usercontext+0x27/0x40 [ 332.356088] [<ffffffff81086297>] execute_in_process_context+0x67/0x70 [ 332.356090] [<ffffffff81440004>] scsi_target_reap+0xc4/0xf0 [ 332.356091] [<ffffffff81441fd6>] scsi_device_dev_release_usercontext+0xe6/0x120 [ 332.356093] [<ffffffff81086297>] execute_in_process_context+0x67/0x70 [ 332.356094] [<ffffffff81441eec>] scsi_device_dev_release+0x1c/0x20 [ 332.356095] [<ffffffff81412fa2>] device_release+0x32/0xa0 [ 332.356098] [<ffffffff813161c7>] kobject_cleanup+0x77/0x1b0 [ 332.356099] [<ffffffff81316080>] kobject_put+0x30/0x60 [ 332.356100] [<ffffffff81413297>] put_device+0x17/0x20 [ 332.356102] [<ffffffff814346eb>] scsi_device_put+0x3b/0x50 [ 332.356104] [<ffffffff81446b80>] scsi_disk_put+0x30/0x50 [ 332.356105] [<ffffffff81446eb2>] sd_release+0x42/0xd0 [ 332.356107] [<ffffffff811f14ac>] __blkdev_put+0x16c/0x1a0 [ 332.356109] [<ffffffff811f144e>] __blkdev_put+0x10e/0x1a0 [ 332.356110] [<ffffffff811f1dec>] blkdev_put+0x4c/0x120 [ 332.356112] [<ffffffff811baf24>] kill_block_super+0x44/0x70 [ 332.356114] [<ffffffff811bb1ed>] deactivate_locked_super+0x3d/0x60 [ 332.356116] [<ffffffff811bb796>] deactivate_super+0x46/0x60 [ 332.356117] [<ffffffff811d74ac>] mntput_no_expire+0xac/0x140 [ 332.356119] [<ffffffff811d891e>] SyS_umount+0x8e/0x100 [ 332.356121] [<ffffffff81695fa9>] system_call_fastpath+0x16/0x1b [ 332.356121] ---[ end trace 9757a72c2f15f7f2 ]--- [ 344.876080] usb 3-3.4: USB disconnect, device number 11 [ 344.887742] ------------[ cut here ]------------ [ 344.887748] WARNING: CPU: 7 PID: 2699 at fs/sysfs/group.c:214 sysfs_remove_group+0xc6/0xd0() [ 344.887750] sysfs group ffffffff81cb06e0 not found for kobject 'target9:0:0' [ 344.887751] Modules linked in: rfcomm nls_utf8 isofs fuse joydev hid_logitech_dj btusb ip6t_rpfilter bnep bluetooth ip6t_REJECT xt_conntrack cfg80211 rfkill ebtable_nat ebtable_broute bridge usb_storage stp llc ebtable_filter ebtables ip6table_nat nf_conntrack_ipv6 nf_defrag_ipv6 nf_nat_ipv6 ip6table_mangle ip6table_security ip6table_raw ip6table_filter ip6_tables iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack iptable_mangle iptable_security iptable_raw iTCO_wdt iTCO_vendor_support ppdev snd_hda_codec_ca0132 vfat fat x86_pkg_temp_thermal coretemp snd_hda_codec_realtek kvm_intel kvm crct10dif_pclmul crc32_pclmul snd_hda_codec_hdmi crc32c_intel snd_hda_intel snd_hda_codec ghash_clmulni_intel snd_hwdep snd_seq microcode snd_seq_device snd_pcm i2c_i801 snd_page_alloc serio_raw [ 344.887783] r8169 lpc_ich snd_timer mfd_core mii snd mei_me mei shpchp soundcore parport_pc parport binfmt_misc i915 i2c_algo_bit drm_kms_helper drm i2c_core video [ 344.887794] CPU: 7 PID: 2699 Comm: umount Tainted: G W 3.13.5-201.fc20.x86_64 #1 [ 344.887795] Hardware name: Gigabyte Technology Co., Ltd. Z87M-D3H/Z87M-D3H, BIOS F9 01/20/2014 [ 344.887796] 0000000000000009 ffff8807e095db70 ffffffff81686fdc ffff8807e095dbb8 [ 344.887799] ffff8807e095dba8 ffffffff8106d47d 0000000000000000 ffffffff81cb06e0 [ 344.887801] ffff8800b794a838 ffff8807b2904188 ffff8808118e1900 ffff8807e095dc08 [ 344.887804] Call Trace: [ 344.887809] [<ffffffff81686fdc>] dump_stack+0x45/0x56 [ 344.887813] [<ffffffff8106d47d>] warn_slowpath_common+0x7d/0xa0 [ 344.887815] [<ffffffff8106d4ec>] warn_slowpath_fmt+0x4c/0x50 [ 344.887818] [<ffffffff81230afe>] ? sysfs_get_dirent_ns+0x4e/0x70 [ 344.887820] [<ffffffff81231dc6>] sysfs_remove_group+0xc6/0xd0 [ 344.887822] [<ffffffff8141dc03>] dpm_sysfs_remove+0x43/0x50 [ 344.887826] [<ffffffff81413955>] device_del+0x45/0x1c0 [ 344.887828] [<ffffffff8143eb87>] scsi_target_reap_usercontext+0x27/0x40 [ 344.887831] [<ffffffff81086297>] execute_in_process_context+0x67/0x70 [ 344.887833] [<ffffffff81440004>] scsi_target_reap+0xc4/0xf0 [ 344.887836] [<ffffffff81441fd6>] scsi_device_dev_release_usercontext+0xe6/0x120 [ 344.887838] [<ffffffff81086297>] execute_in_process_context+0x67/0x70 [ 344.887840] [<ffffffff81441eec>] scsi_device_dev_release+0x1c/0x20 [ 344.887842] [<ffffffff81412fa2>] device_release+0x32/0xa0 [ 344.887845] [<ffffffff813161c7>] kobject_cleanup+0x77/0x1b0 [ 344.887847] [<ffffffff81316080>] kobject_put+0x30/0x60 [ 344.887850] [<ffffffff81413297>] put_device+0x17/0x20 [ 344.887852] [<ffffffff814346eb>] scsi_device_put+0x3b/0x50 [ 344.887855] [<ffffffff81446b80>] scsi_disk_put+0x30/0x50 [ 344.887857] [<ffffffff81446eb2>] sd_release+0x42/0xd0 [ 344.887860] [<ffffffff811f14ac>] __blkdev_put+0x16c/0x1a0 [ 344.887862] [<ffffffff811f144e>] __blkdev_put+0x10e/0x1a0 [ 344.887864] [<ffffffff811f1dec>] blkdev_put+0x4c/0x120 [ 344.887867] [<ffffffff811baf24>] kill_block_super+0x44/0x70 [ 344.887870] [<ffffffff811bb1ed>] deactivate_locked_super+0x3d/0x60 [ 344.887872] [<ffffffff811bb796>] deactivate_super+0x46/0x60 [ 344.887875] [<ffffffff811d74ac>] mntput_no_expire+0xac/0x140 [ 344.887877] [<ffffffff811d891e>] SyS_umount+0x8e/0x100 [ 344.887881] [<ffffffff81695fa9>] system_call_fastpath+0x16/0x1b [ 344.887882] ---[ end trace 9757a72c2f15f7f3 ]--- [ 376.601048] usb 3-3.1.7: USB disconnect, device number 12 [ 376.602042] r8169 0000:02:00.0 p4p1: frags: 0 [ 376.612414] ------------[ cut here ]------------ [ 376.612421] WARNING: CPU: 6 PID: 2758 at fs/sysfs/group.c:214 sysfs_remove_group+0xc6/0xd0() [ 376.612422] sysfs group ffffffff81cb06e0 not found for kobject 'target10:0:0' [ 376.612423] Modules linked in: rfcomm nls_utf8 isofs fuse joydev hid_logitech_dj btusb ip6t_rpfilter bnep bluetooth ip6t_REJECT xt_conntrack cfg80211 rfkill ebtable_nat ebtable_broute bridge usb_storage stp llc ebtable_filter ebtables ip6table_nat nf_conntrack_ipv6 nf_defrag_ipv6 nf_nat_ipv6 ip6table_mangle ip6table_security ip6table_raw ip6table_filter ip6_tables iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack iptable_mangle iptable_security iptable_raw iTCO_wdt iTCO_vendor_support ppdev snd_hda_codec_ca0132 vfat fat x86_pkg_temp_thermal coretemp snd_hda_codec_realtek kvm_intel kvm crct10dif_pclmul crc32_pclmul snd_hda_codec_hdmi crc32c_intel snd_hda_intel snd_hda_codec ghash_clmulni_intel snd_hwdep snd_seq microcode snd_seq_device snd_pcm i2c_i801 snd_page_alloc serio_raw [ 376.612453] r8169 lpc_ich snd_timer mfd_core mii snd mei_me mei shpchp soundcore parport_pc parport binfmt_misc i915 i2c_algo_bit drm_kms_helper drm i2c_core video [ 376.612464] CPU: 6 PID: 2758 Comm: umount Tainted: G W 3.13.5-201.fc20.x86_64 #1 [ 376.612465] Hardware name: Gigabyte Technology Co., Ltd. Z87M-D3H/Z87M-D3H, BIOS F9 01/20/2014 [ 376.612466] 0000000000000009 ffff8807cd6a1b70 ffffffff81686fdc ffff8807cd6a1bb8 [ 376.612469] ffff8807cd6a1ba8 ffffffff8106d47d 0000000000000000 ffffffff81cb06e0 [ 376.612471] ffff88081167f438 ffff8807b2945188 ffff8807e1db1100 ffff8807cd6a1c08 [ 376.612473] Call Trace: [ 376.612478] [<ffffffff81686fdc>] dump_stack+0x45/0x56 [ 376.612481] [<ffffffff8106d47d>] warn_slowpath_common+0x7d/0xa0 [ 376.612484] [<ffffffff8106d4ec>] warn_slowpath_fmt+0x4c/0x50 [ 376.612486] [<ffffffff81230afe>] ? sysfs_get_dirent_ns+0x4e/0x70 [ 376.612488] [<ffffffff81231dc6>] sysfs_remove_group+0xc6/0xd0 [ 376.612491] [<ffffffff8141dc03>] dpm_sysfs_remove+0x43/0x50 [ 376.612494] [<ffffffff81413955>] device_del+0x45/0x1c0 [ 376.612496] [<ffffffff8143eb87>] scsi_target_reap_usercontext+0x27/0x40 [ 376.612499] [<ffffffff81086297>] execute_in_process_context+0x67/0x70 [ 376.612501] [<ffffffff81440004>] scsi_target_reap+0xc4/0xf0 [ 376.612504] [<ffffffff81441fd6>] scsi_device_dev_release_usercontext+0xe6/0x120 [ 376.612505] [<ffffffff81086297>] execute_in_process_context+0x67/0x70 [ 376.612507] [<ffffffff81441eec>] scsi_device_dev_release+0x1c/0x20 [ 376.612509] [<ffffffff81412fa2>] device_release+0x32/0xa0 [ 376.612513] [<ffffffff813161c7>] kobject_cleanup+0x77/0x1b0 [ 376.612514] [<ffffffff81316080>] kobject_put+0x30/0x60 [ 376.612517] [<ffffffff81413297>] put_device+0x17/0x20 [ 376.612519] [<ffffffff814346eb>] scsi_device_put+0x3b/0x50 [ 376.612522] [<ffffffff81446b80>] scsi_disk_put+0x30/0x50 [ 376.612524] [<ffffffff81446eb2>] sd_release+0x42/0xd0 [ 376.612527] [<ffffffff811f14ac>] __blkdev_put+0x16c/0x1a0 [ 376.612529] [<ffffffff811f144e>] __blkdev_put+0x10e/0x1a0 [ 376.612530] [<ffffffff811f1dec>] blkdev_put+0x4c/0x120 [ 376.612533] [<ffffffff811baf24>] kill_block_super+0x44/0x70 [ 376.612536] [<ffffffff811bb1ed>] deactivate_locked_super+0x3d/0x60 [ 376.612538] [<ffffffff811bb796>] deactivate_super+0x46/0x60 [ 376.612540] [<ffffffff811d74ac>] mntput_no_expire+0xac/0x140 [ 376.612542] [<ffffffff811d891e>] SyS_umount+0x8e/0x100 [ 376.612546] [<ffffffff81695fa9>] system_call_fastpath+0x16/0x1b [ 376.612547] ---[ end trace 9757a72c2f15f7f4 ]--- [ 422.142800] usb 3-3.2: USB disconnect, device number 14 [ 422.161117] ------------[ cut here ]------------ [ 422.161122] WARNING: CPU: 4 PID: 3018 at fs/sysfs/group.c:214 sysfs_remove_group+0xc6/0xd0() [ 422.161123] sysfs group ffffffff81cb06e0 not found for kobject 'target12:0:0' [ 422.161124] Modules linked in: rfcomm nls_utf8 isofs fuse joydev hid_logitech_dj btusb ip6t_rpfilter bnep bluetooth ip6t_REJECT xt_conntrack cfg80211 rfkill ebtable_nat ebtable_broute bridge usb_storage stp llc ebtable_filter ebtables ip6table_nat nf_conntrack_ipv6 nf_defrag_ipv6 nf_nat_ipv6 ip6table_mangle ip6table_security ip6table_raw ip6table_filter ip6_tables iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack iptable_mangle iptable_security iptable_raw iTCO_wdt iTCO_vendor_support ppdev snd_hda_codec_ca0132 vfat fat x86_pkg_temp_thermal coretemp snd_hda_codec_realtek kvm_intel kvm crct10dif_pclmul crc32_pclmul snd_hda_codec_hdmi crc32c_intel snd_hda_intel snd_hda_codec ghash_clmulni_intel snd_hwdep snd_seq microcode snd_seq_device snd_pcm i2c_i801 snd_page_alloc serio_raw [ 422.161146] r8169 lpc_ich snd_timer mfd_core mii snd mei_me mei shpchp soundcore parport_pc parport binfmt_misc i915 i2c_algo_bit drm_kms_helper drm i2c_core video [ 422.161153] CPU: 4 PID: 3018 Comm: umount Tainted: G W 3.13.5-201.fc20.x86_64 #1 [ 422.161153] Hardware name: Gigabyte Technology Co., Ltd. Z87M-D3H/Z87M-D3H, BIOS F9 01/20/2014 [ 422.161154] 0000000000000009 ffff8807b2971b70 ffffffff81686fdc ffff8807b2971bb8 [ 422.161156] ffff8807b2971ba8 ffffffff8106d47d 0000000000000000 ffffffff81cb06e0 [ 422.161157] ffff88003fab5438 ffff8807b6314188 ffff8807e4f4d100 ffff8807b2971c08 [ 422.161159] Call Trace: [ 422.161163] [<ffffffff81686fdc>] dump_stack+0x45/0x56 [ 422.161166] [<ffffffff8106d47d>] warn_slowpath_common+0x7d/0xa0 [ 422.161167] [<ffffffff8106d4ec>] warn_slowpath_fmt+0x4c/0x50 [ 422.161169] [<ffffffff81230afe>] ? sysfs_get_dirent_ns+0x4e/0x70 [ 422.161170] [<ffffffff81231dc6>] sysfs_remove_group+0xc6/0xd0 [ 422.161172] [<ffffffff8141dc03>] dpm_sysfs_remove+0x43/0x50 [ 422.161175] [<ffffffff81413955>] device_del+0x45/0x1c0 [ 422.161176] [<ffffffff8143eb87>] scsi_target_reap_usercontext+0x27/0x40 [ 422.161178] [<ffffffff81086297>] execute_in_process_context+0x67/0x70 [ 422.161179] [<ffffffff81440004>] scsi_target_reap+0xc4/0xf0 [ 422.161181] [<ffffffff81441fd6>] scsi_device_dev_release_usercontext+0xe6/0x120 [ 422.161183] [<ffffffff81086297>] execute_in_process_context+0x67/0x70 [ 422.161184] [<ffffffff81441eec>] scsi_device_dev_release+0x1c/0x20 [ 422.161185] [<ffffffff81412fa2>] device_release+0x32/0xa0 [ 422.161188] [<ffffffff813161c7>] kobject_cleanup+0x77/0x1b0 [ 422.161189] [<ffffffff81316080>] kobject_put+0x30/0x60 [ 422.161190] [<ffffffff81413297>] put_device+0x17/0x20 [ 422.161192] [<ffffffff814346eb>] scsi_device_put+0x3b/0x50 [ 422.161194] [<ffffffff81446b80>] scsi_disk_put+0x30/0x50 [ 422.161196] [<ffffffff81446eb2>] sd_release+0x42/0xd0 [ 422.161198] [<ffffffff811f14ac>] __blkdev_put+0x16c/0x1a0 [ 422.161199] [<ffffffff811f144e>] __blkdev_put+0x10e/0x1a0 [ 422.161200] [<ffffffff811f1dec>] blkdev_put+0x4c/0x120 [ 422.161203] [<ffffffff811baf24>] kill_block_super+0x44/0x70 [ 422.161205] [<ffffffff811bb1ed>] deactivate_locked_super+0x3d/0x60 [ 422.161206] [<ffffffff811bb796>] deactivate_super+0x46/0x60 [ 422.161208] [<ffffffff811d74ac>] mntput_no_expire+0xac/0x140 [ 422.161210] [<ffffffff811d891e>] SyS_umount+0x8e/0x100 [ 422.161212] [<ffffffff81695fa9>] system_call_fastpath+0x16/0x1b [ 422.161213] ---[ end trace 9757a72c2f15f7f5 ]---
Connected my 16GB USB device (which is formatted as FAT) to a USB3 port: WARNING: CPU: 0 PID: 5461 at fs/sysfs/group.c:214 sysfs_remove_group+0xc6/0xd0() sysfs group ffffffff81cb06e0 not found for kobject 'target6:0:0' Modules linked in: usb_storage fuse bnep bluetooth cfg80211 rfkill vboxpci(OF) vboxnetadp(OF) vboxnetflt(OF) ip6t_rpfilter ip6t_REJECT xt_conntrack vboxdrv(OF) ebtable_nat ebtable_broute bridge stp llc ebtable_filter ebtables ip6table_nat nf_conntrack_ipv6 nf_defrag_ipv6 nf_nat_ipv6 ip6table_mangle ip6table_security ip6table_raw ip6table_filter ip6_tables iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack iptable_mangle iptable_security iptable_raw vfat fat joydev snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_intel snd_hda_codec snd_hwdep snd_seq snd_seq_device snd_pcm r8169 mii iTCO_wdt iTCO_vendor_support x86_pkg_temp_thermal snd_page_alloc snd_timer snd mei_me coretemp kvm_intel kvm soundcore shpchp lpc_ich mfd_core mei microcode serio_raw i2c_i801 dm_crypt nouveau mxm_wmi wmi i2c_algo_bit drm_kms_helper ttm crct10dif_pclmul crc32_pclmul crc32c_intel drm ghash_clmulni_intel i2c_core video CPU: 0 PID: 5461 Comm: umount Tainted: GF O 3.13.5-200.fc20.x86_64 #1 Hardware name: Gigabyte Technology Co., Ltd. To be filled by O.E.M./B75M-D3H, BIOS F14 04/17/2013 0000000000000009 ffff88010f359b70 ffffffff81686fdc ffff88010f359bb8 ffff88010f359ba8 ffffffff8106d47d 0000000000000000 ffffffff81cb06e0 ffff8800d1ee1438 ffff8800506ca188 ffff8800d8a08100 ffff88010f359c08 Call Trace: [<ffffffff81686fdc>] dump_stack+0x45/0x56 [<ffffffff8106d47d>] warn_slowpath_common+0x7d/0xa0 [<ffffffff8106d4ec>] warn_slowpath_fmt+0x4c/0x50 [<ffffffff81230afe>] ? sysfs_get_dirent_ns+0x4e/0x70 [<ffffffff81231dc6>] sysfs_remove_group+0xc6/0xd0 [<ffffffff8141dc03>] dpm_sysfs_remove+0x43/0x50 [<ffffffff81413955>] device_del+0x45/0x1c0 [<ffffffff8143eb87>] scsi_target_reap_usercontext+0x27/0x40 [<ffffffff81086297>] execute_in_process_context+0x67/0x70 [<ffffffff81440004>] scsi_target_reap+0xc4/0xf0 [<ffffffff81441fd6>] scsi_device_dev_release_usercontext+0xe6/0x120 [<ffffffff81086297>] execute_in_process_context+0x67/0x70 [<ffffffff81441eec>] scsi_device_dev_release+0x1c/0x20 [<ffffffff81412fa2>] device_release+0x32/0xa0 [<ffffffff813161c7>] kobject_cleanup+0x77/0x1b0 [<ffffffff81316080>] kobject_put+0x30/0x60 [<ffffffff81413297>] put_device+0x17/0x20 [<ffffffff814346eb>] scsi_device_put+0x3b/0x50 [<ffffffff81446b80>] scsi_disk_put+0x30/0x50 [<ffffffff81446eb2>] sd_release+0x42/0xd0 [<ffffffff811f14ac>] __blkdev_put+0x16c/0x1a0 [<ffffffff811f144e>] __blkdev_put+0x10e/0x1a0 [<ffffffff811f1dec>] blkdev_put+0x4c/0x120 [<ffffffff811baf24>] kill_block_super+0x44/0x70 [<ffffffff811bb1ed>] deactivate_locked_super+0x3d/0x60 [<ffffffff811bb796>] deactivate_super+0x46/0x60 [<ffffffff811d74ac>] mntput_no_expire+0xac/0x140 [<ffffffff811d891e>] SyS_umount+0x8e/0x100 [<ffffffff81695fa9>] system_call_fastpath+0x16/0x1b
*********** MASS BUG UPDATE ************** We apologize for the inconvenience. There is a large number of bugs to go through and several of them have gone stale. Due to this, we are doing a mass bug update across all of the Fedora 20 kernel bugs. Fedora 20 has now been rebased to 3.14.4-200.fc20. Please test this kernel update (or newer) and let us know if you issue has been resolved or if it is still present with the newer kernel. If you experience different issues, please open a new bug report for those.
still not fixed when I remove flash stick see this error: [ 1776.058242] usb 3-3.4: USB disconnect, device number 5 [ 1776.225865] ------------[ cut here ]------------ [ 1776.225873] WARNING: CPU: 3 PID: 3539 at fs/sysfs/group.c:216 sysfs_remove_group+0x93/0xa0() [ 1776.225875] sysfs group ffffffff81cce1e0 not found for kobject 'target6:0:0' [ 1776.225876] Modules linked in: nls_utf8 isofs fuse ipt_MASQUERADE xt_CHECKSUM ip6t_rpfilter ip6t_REJECT xt_conntrack cfg80211 ebtable_nat ebtable_broute bridge stp llc ebtable_filter ebtables ip6table_nat nf_conntrack_ipv6 nf_defrag_ipv6 nf_nat_ipv6 ip6table_mangle ip6table_security ip6table_raw ip6table_filter ip6_tables iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack iptable_mangle iptable_security iptable_raw tun bnep iTCO_wdt iTCO_vendor_support ppdev btrfs raid6_pq xor vfat hid_logitech_dj fat btusb bluetooth x86_pkg_temp_thermal 6lowpan_iphc coretemp kvm_intel rfkill kvm crct10dif_pclmul crc32_pclmul crc32c_intel ghash_clmulni_intel microcode usb_storage snd_hda_codec_realtek snd_hda_codec_generic snd_hda_codec_hdmi serio_raw snd_hda_intel snd_hda_codec snd_hwdep [ 1776.225902] snd_seq snd_seq_device snd_pcm mei_me shpchp i2c_i801 mei snd_timer lpc_ich mfd_core snd soundcore parport_pc parport binfmt_misc nfsd auth_rpcgss nfs_acl lockd sunrpc i915 i2c_algo_bit drm_kms_helper drm r8169 mii i2c_core video [ 1776.225917] CPU: 3 PID: 3539 Comm: umount Not tainted 3.14.4-200.fc20.x86_64+debug #1 [ 1776.225918] Hardware name: Gigabyte Technology Co., Ltd. Z87M-D3H/Z87M-D3H, BIOS F10a 02/10/2014 [ 1776.225919] 0000000000000000 00000000d804911a ffff8807e6379b30 ffffffff817d54cf [ 1776.225921] ffff8807e6379b78 ffff8807e6379b68 ffffffff8109680d 0000000000000000 [ 1776.225923] ffffffff81cce1e0 ffff8807e6385038 ffff8807e63702d0 ffff8807e6396148 [ 1776.225925] Call Trace: [ 1776.225929] [<ffffffff817d54cf>] dump_stack+0x4d/0x66 [ 1776.225932] [<ffffffff8109680d>] warn_slowpath_common+0x7d/0xa0 [ 1776.225933] [<ffffffff8109688c>] warn_slowpath_fmt+0x5c/0x80 [ 1776.225935] [<ffffffff817dc12e>] ? mutex_unlock+0xe/0x10 [ 1776.225937] [<ffffffff812c2a0a>] ? kernfs_find_and_get_ns+0x4a/0x60 [ 1776.225939] [<ffffffff812c1363>] sysfs_remove_group+0x93/0xa0 [ 1776.225942] [<ffffffff81505413>] dpm_sysfs_remove+0x43/0x50 [ 1776.225944] [<ffffffff814fa835>] device_del+0x45/0x1d0 [ 1776.225946] [<ffffffff8152a9a7>] scsi_target_reap_usercontext+0x27/0x40 [ 1776.225948] [<ffffffff8152a980>] ? scsi_target_destroy+0xc0/0xc0 [ 1776.225950] [<ffffffff810bb479>] execute_in_process_context+0x99/0xb0 [ 1776.225953] [<ffffffff8152bedf>] scsi_target_reap+0xcf/0x100 [ 1776.225956] [<ffffffff8152df4e>] scsi_device_dev_release_usercontext+0xee/0x130 [ 1776.225959] [<ffffffff8152de60>] ? scsi_device_dev_release+0x20/0x20 [ 1776.225961] [<ffffffff810bb479>] execute_in_process_context+0x99/0xb0 [ 1776.225964] [<ffffffff8152de5c>] scsi_device_dev_release+0x1c/0x20 [ 1776.225966] [<ffffffff814f9da2>] device_release+0x32/0xa0 [ 1776.225970] [<ffffffff813cca97>] kobject_cleanup+0x77/0x1b0 [ 1776.225973] [<ffffffff813cc950>] kobject_put+0x30/0x60 [ 1776.225979] [<ffffffff814fa107>] put_device+0x17/0x20 [ 1776.225982] [<ffffffff8151e8cb>] scsi_device_put+0x3b/0x50 [ 1776.225985] [<ffffffff81532aa2>] scsi_disk_put+0x32/0x50 [ 1776.225988] [<ffffffff81532e02>] sd_release+0x42/0xd0 [ 1776.226018] [<ffffffff81279adc>] __blkdev_put+0x17c/0x1b0 [ 1776.226023] [<ffffffff81279a7c>] __blkdev_put+0x11c/0x1b0 [ 1776.226027] [<ffffffff8127a4e0>] blkdev_put+0x50/0x160 [ 1776.226033] [<ffffffff81238a04>] kill_block_super+0x44/0x70 [ 1776.226038] [<ffffffff81238e4d>] deactivate_locked_super+0x3d/0x60 [ 1776.226042] [<ffffffff81239426>] deactivate_super+0x46/0x60 [ 1776.226047] [<ffffffff8125b6dd>] mntput_no_expire+0x17d/0x1f0 [ 1776.226051] [<ffffffff8125b577>] ? mntput_no_expire+0x17/0x1f0 [ 1776.226056] [<ffffffff8125d0cd>] SyS_umount+0x9d/0x110 [ 1776.226062] [<ffffffff817e9729>] system_call_fastpath+0x16/0x1b [ 1776.226065] ---[ end trace cc21c204e76fb6df ]---
Marking Bug 1071525 as duplicate of Bug 1030988. Please revert if this is incorrect. *** This bug has been marked as a duplicate of bug 1030988 ***