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[Chris J Arges <1283604@xxxxxxxxxxxxxxxxxx>]

Joe, I tested with the latest mainline kernel as of 3/25 (b098d6726bbfb94c06d6e1097466187afddae61f) and can still reproduce this exact issue. It looks like its an upstream issue as well:
https://bugzilla.kernel.org/show_bug.cgi?id=71021
https://bugzilla.kernel.org/show_bug.cgi?id=69441
http://www.spinics.net/lists/linux-usb/msg102568.html

I'll check if the following patches solve the issue as they aren't mainline yet:
	http://marc.info/?l=linux-scsi&m=139031645920152&w=2
	http://marc.info/?l=linux-scsi&m=139031650720168&w=2

** Changed in: linux (Ubuntu)
       Status: Incomplete => Confirmed

** Bug watch added: Linux Kernel Bug Tracker #69441
   http://bugzilla.kernel.org/show_bug.cgi?id=69441

** Changed in: linux (Ubuntu)
   Importance: Medium => High

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Title:
  WARNING: CPU: 0 PID: 5517 at
  /build/buildd/linux-3.13.0/fs/sysfs/group.c:214
  sysfs_remove_group+0xc6/0xd0()

Status in The Linux Kernel:
  Unknown
Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  [ 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.

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