Comment 0 for bug 1283604

[ 5425.167885] usb 3-2: USB disconnect, device number 2
[ 7292.553234] usb 3-1: USB disconnect, device number 10
[ 7292.623563] FAT-fs (sdc1): unable to read boot sector to mark fs as dirty
[ 7292.623613] ------------[ cut here ]------------
[ 7292.623624] WARNING: CPU: 0 PID: 5517 at /build/buildd/linux-3.13.0/fs/sysfs/group.c:214 sysfs_remove_group+0xc6/0xd0()
[ 7292.623626] sysfs group ffffffff81cabb00 not found for kobject 'target6:0:0'
[ 7292.623628] Modules linked in: nls_iso8859_1 nls_utf8 isofs usb_storage ctr ccm pci_stub vboxpci(OF) vboxnetadp(OF) vboxnetflt(OF) vboxdrv(OF) parport_pc ppdev rfcomm bnep joydev intel_rapl x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm crct10dif_pclmul crc32_pclmul ghash_clmulni_intel cryptd snd_hda_codec_hdmi snd_hda_codec_realtek btusb bluetooth samsung_laptop snd_hda_intel snd_hda_codec snd_hwdep snd_pcm microcode snd_page_alloc snd_seq_midi snd_seq_midi_event snd_rawmidi uvcvideo videobuf2_vmalloc snd_seq videobuf2_memops videobuf2_core arc4 snd_seq_device videodev snd_timer iwldvm snd psmouse mac80211 serio_raw iwlwifi cfg80211 lpc_ich soundcore mei_me mei i915 wmi video drm_kms_helper mac_hid drm i2c_algo_bit lp parport hid_generic usbhid hid btrfs xor raid6_pq libcrc32c ahci r8169 libahci mii
[ 7292.623708] CPU: 0 PID: 5517 Comm: umount Tainted: GF O 3.13.0-11-generic #31-Ubuntu
[ 7292.623711] Hardware name: SAMSUNG ELECTRONICS CO., LTD. 530U3C/530U4C/SAMSUNG_NP1234567890, BIOS P14AAJ 04/15/2013
[ 7292.623713] 0000000000000009 ffff880025bf1b70 ffffffff817163b5 ffff880025bf1bb8
[ 7292.623718] ffff880025bf1ba8 ffffffff8106450d 0000000000000000 ffffffff81cabb00
[ 7292.623723] ffff8800c0191438 ffff880053d83188 ffff8800ad531800 ffff880025bf1c08
[ 7292.623727] Call Trace:
[ 7292.623735] [<ffffffff817163b5>] dump_stack+0x45/0x56
[ 7292.623741] [<ffffffff8106450d>] warn_slowpath_common+0x7d/0xa0
[ 7292.623745] [<ffffffff8106457c>] warn_slowpath_fmt+0x4c/0x50
[ 7292.623751] [<ffffffff8122edfe>] ? sysfs_get_dirent_ns+0x4e/0x70
[ 7292.623756] [<ffffffff812300d6>] sysfs_remove_group+0xc6/0xd0
[ 7292.623761] [<ffffffff81496543>] dpm_sysfs_remove+0x43/0x50
[ 7292.623766] [<ffffffff8148bf75>] device_del+0x45/0x1c0
[ 7292.623772] [<ffffffff814ddd17>] scsi_target_reap_usercontext+0x27/0x40
[ 7292.623777] [<ffffffff8107ed27>] execute_in_process_context+0x67/0x70
[ 7292.623782] [<ffffffff814df6e4>] scsi_target_reap+0xc4/0xf0
[ 7292.623786] [<ffffffff814e12d8>] scsi_device_dev_release_usercontext+0x188/0x1c0
[ 7292.623790] [<ffffffff8107ed27>] execute_in_process_context+0x67/0x70
[ 7292.623794] [<ffffffff814e114c>] scsi_device_dev_release+0x1c/0x20
[ 7292.623798] [<ffffffff8148b5c2>] device_release+0x32/0xa0
[ 7292.623802] [<ffffffff81359f57>] kobject_cleanup+0x77/0x1b0
[ 7292.623805] [<ffffffff81359df8>] kobject_put+0x28/0x60
[ 7292.623809] [<ffffffff8148b8b7>] put_device+0x17/0x20
[ 7292.623813] [<ffffffff814d36cb>] scsi_device_put+0x3b/0x50
[ 7292.623819] [<ffffffff814e8940>] scsi_disk_put+0x30/0x50
[ 7292.623823] [<ffffffff814e8c72>] sd_release+0x42/0xd0
[ 7292.623827] [<ffffffff811f15ac>] __blkdev_put+0x16c/0x1a0
[ 7292.623831] [<ffffffff811f154e>] __blkdev_put+0x10e/0x1a0
[ 7292.623834] [<ffffffff811f1efe>] blkdev_put+0x4e/0x140
[ 7292.623839] [<ffffffff811b9cb4>] kill_block_super+0x44/0x70
[ 7292.623843] [<ffffffff811b9f7d>] deactivate_locked_super+0x3d/0x60
[ 7292.623847] [<ffffffff811ba536>] deactivate_super+0x46/0x60
[ 7292.623853] [<ffffffff811d71e6>] mntput_no_expire+0xd6/0x170
[ 7292.623856] [<ffffffff811d86ce>] SyS_umount+0x8e/0x100
[ 7292.623861] [<ffffffff81726fbf>] tracesys+0xe1/0xe6
[ 7292.623864] ---[ end trace e80cad625b577b20 ]---

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: linux-image-3.13.0-11-generic 3.13.0-11.31
ProcVersionSignature: Ubuntu 3.13.0-11.31-generic 3.13.3
Uname: Linux 3.13.0-11-generic x86_64
ApportVersion: 2.13.2-0ubuntu5
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: caravena 2174 F.... pulseaudio
CRDA:
 country CL:
  (2402 - 2482 @ 40), (N/A, 20)
  (5170 - 5250 @ 40), (N/A, 20)
  (5250 - 5330 @ 40), (N/A, 20), DFS
  (5735 - 5835 @ 40), (N/A, 20)
CurrentDesktop: GNOME
Date: Sat Feb 22 21:46:15 2014
HibernationDevice: RESUME=UUID=360bd2d2-4f44-4311-86d6-4781ac81ee87
InstallationDate: Installed on 2014-01-23 (30 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Alpha amd64 (20140122)
MachineType: SAMSUNG ELECTRONICS CO., LTD. 530U3C/530U4C
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/@/boot/vmlinuz-3.13.0-11-generic root=UUID=0c67119c-ddae-476a-b510-142ec598f691 ro rootflags=subvol=@ quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-3.13.0-11-generic N/A
 linux-backports-modules-3.13.0-11-generic N/A
 linux-firmware 1.125
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 04/15/2013
dmi.bios.vendor: Phoenix Technologies Ltd.
dmi.bios.version: P14AAJ
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: SAMSUNG_NP1234567890
dmi.board.vendor: SAMSUNG ELECTRONICS CO., LTD.
dmi.board.version: FAB1
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 9
dmi.chassis.vendor: SAMSUNG ELECTRONICS CO., LTD.
dmi.chassis.version: 0.1
dmi.modalias: dmi:bvnPhoenixTechnologiesLtd.:bvrP14AAJ:bd04/15/2013:svnSAMSUNGELECTRONICSCO.,LTD.:pn530U3C/530U4C:pvr0.1:rvnSAMSUNGELECTRONICSCO.,LTD.:rnSAMSUNG_NP1234567890:rvrFAB1:cvnSAMSUNGELECTRONICSCO.,LTD.:ct9:cvr0.1:
dmi.product.name: 530U3C/530U4C
dmi.product.version: 0.1
dmi.sys.vendor: SAMSUNG ELECTRONICS CO., LTD.