I am still being driven nuts by this. Random usb 3.0 hard drive disconnection. >lspci 00:00.0 Host bridge: Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor DRAM Controller (rev 06) 00:01.0 PCI bridge: Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor PCI Express x16 Controller (rev 06) 00:02.0 VGA compatible controller: Intel Corporation 4th Gen Core Processor Integrated Graphics Controller (rev 06) 00:14.0 USB controller: Intel Corporation 8 Series/C220 Series Chipset Family USB xHCI (rev 05) 00:16.0 Communication controller: Intel Corporation 8 Series/C220 Series Chipset Family MEI Controller #1 (rev 04) 00:1a.0 USB controller: Intel Corporation 8 Series/C220 Series Chipset Family USB EHCI #2 (rev 05) 00:1b.0 Audio device: Intel Corporation 8 Series/C220 Series Chipset High Definition Audio Controller (rev 05) 00:1c.0 PCI bridge: Intel Corporation 8 Series/C220 Series Chipset Family PCI Express Root Port #1 (rev d5) 00:1c.2 PCI bridge: Intel Corporation 8 Series/C220 Series Chipset Family PCI Express Root Port #3 (rev d5) 00:1c.3 PCI bridge: Intel Corporation 8 Series/C220 Series Chipset Family PCI Express Root Port #4 (rev d5) 00:1c.4 PCI bridge: Intel Corporation 8 Series/C220 Series Chipset Family PCI Express Root Port #5 (rev d5) 00:1d.0 USB controller: Intel Corporation 8 Series/C220 Series Chipset Family USB EHCI #1 (rev 05) 00:1f.0 ISA bridge: Intel Corporation HM87 Express LPC Controller (rev 05) 00:1f.2 SATA controller: Intel Corporation 8 Series/C220 Series Chipset Family 6-port SATA Controller 1 [AHCI mode] (rev 05) 00:1f.3 SMBus: Intel Corporation 8 Series/C220 Series Chipset Family SMBus Controller (rev 05) 01:00.0 VGA compatible controller: NVIDIA Corporation GK104M [GeForce GTX 880M] (rev a1) 03:00.0 Ethernet controller: Qualcomm Atheros Killer E2200 Gigabit Ethernet Controller (rev 13) 04:00.0 Network controller: Qualcomm Atheros AR9462 Wireless Network Adapter (rev 01) 05:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. RTS5227 PCI Express Card Reader (rev 01) >dmesg [ 145.156136] EXT4-fs (dm-4): recovery complete [ 145.156257] EXT4-fs (dm-4): mounted filesystem with ordered data mode. Opts: (null) [ 196.482958] usb 2-1: USB disconnect, device number 2 [ 196.483807] scsi 6:0:0:0: rejecting I/O to offline device [ 196.483812] scsi 6:0:0:0: [sdc] killing request [ 196.483815] scsi 6:0:0:0: rejecting I/O to offline device [ 196.483817] scsi 6:0:0:0: [sdc] killing request [ 196.483819] scsi 6:0:0:0: rejecting I/O to dead device [ 196.483829] scsi 6:0:0:0: rejecting I/O to dead device [ 196.483839] scsi 6:0:0:0: [sdc] [ 196.483840] Result: hostbyte=DID_NO_CONNECT driverbyte=DRIVER_OK [ 196.483842] scsi 6:0:0:0: [sdc] CDB: [ 196.483844] Read(10): 28 00 00 06 4a 00 00 00 f0 00 [ 196.483852] blk_update_request: I/O error, dev sdc, sector 412160 [ 196.483863] scsi 6:0:0:0: [sdc] [ 196.483864] Result: hostbyte=DID_NO_CONNECT driverbyte=DRIVER_OK [ 196.483866] scsi 6:0:0:0: [sdc] CDB: [ 196.483867] Read(10): 28 00 00 06 4a f0 00 00 10 00 [ 196.483873] blk_update_request: I/O error, dev sdc, sector 412400 [ 196.540789] Buffer I/O error on dev dm-4, logical block 244190112, async page read [ 196.540797] Buffer I/O error on dev dm-4, logical block 244190132, async page read [ 196.540803] Buffer I/O error on dev dm-4, logical block 244190133, async page read [ 196.540839] Buffer I/O error on dev dm-4, logical block 244190133, async page read [ 196.540841] Buffer I/O error on dev dm-4, logical block 244190133, async page read [ 196.540843] Buffer I/O error on dev dm-4, logical block 244190133, async page read [ 196.540845] Buffer I/O error on dev dm-4, logical block 244190133, async page read [ 196.540847] Buffer I/O error on dev dm-4, logical block 244190133, async page read [ 196.540850] Buffer I/O error on dev dm-4, logical block 244190126, async page read [ 196.540852] Buffer I/O error on dev dm-4, logical block 244190132, async page read [ 201.753269] xhci_hcd 0000:00:14.0: Command completion event does not match command [ 201.753275] xhci_hcd 0000:00:14.0: Timeout while waiting for setup device command [ 202.897358] buffer_io_error: 7 callbacks suppressed [ 202.897360] Buffer I/O error on dev dm-4, logical block 121667584, lost sync page write [ 202.897363] JBD2: Error -5 detected when updating journal superblock for dm-4-8. [ 202.897369] Buffer I/O error on dev dm-4, logical block 121667584, lost sync page write [ 202.897370] JBD2: Error -5 detected when updating journal superblock for dm-4-8. [ 202.897745] Buffer I/O error on dev dm-4, logical block 0, lost sync page write [ 202.898487] ------------[ cut here ]------------ [ 202.898492] WARNING: CPU: 3 PID: 5108 at /home/kernel/COD/linux/fs/block_dev.c:67 bdev_inode_switch_bdi+0x86/0x90() [ 202.898493] Modules linked in: vmnet(OE) vmw_vsock_vmci_transport vsock vmw_vmci vmmon(OE) bbswitch(OE) rfcomm bnep binfmt_misc snd_hda_codec_realtek snd_hda_codec_generic snd_usb_audio snd_hda_intel snd_hda_controller snd_usbmidi_lib snd_hda_codec snd_hwdep snd_pcm snd_seq_midi snd_seq_midi_event snd_rawmidi snd_seq nvidia(POE) mxm_wmi msi_wmi sparse_keymap arc4 snd_seq_device ath9k snd_timer snd ath9k_common ath9k_hw soundcore ath mac80211 cfg80211 ath3k btusb bluetooth rtsx_pci_ms memstick dm_multipath scsi_dh mei_me intel_rapl ie31200_edac mei eeprom edac_core shpchp i2c_i801 lpc_ich x86_pkg_temp_thermal intel_powerclamp coretemp joydev kvm_intel kvm serio_raw mac_hid wmi parport_pc ppdev r8168(OE) lp parport dm_crypt raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq raid0 multipath linear dm_mirror dm_region_hash dm_log hid_logitech_dj hid_generic usbhid hid raid1 uas usb_storage rtsx_pci_sdmmc i915 crct10dif_pclmul crc32_pclmul ghash_clmulni_intel i2c_algo_bit drm_kms_helper aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd drm psmouse ahci alx libahci rtsx_pci mdio video [ 202.898537] CPU: 3 PID: 5108 Comm: pool Tainted: P OE 3.18.6-031806-generic #201502061036 [ 202.898538] Hardware name: Micro-Star International Co., Ltd. GT70 2PE/MS-1763, BIOS E1763IMS.51B 01/29/2015 [ 202.898539] 0000000000000043 ffff8800abccfd68 ffffffff817a69d7 0000000000000007 [ 202.898541] 0000000000000000 ffff8800abccfda8 ffffffff81074b5c 0000000000000000 [ 202.898542] ffff880322c28df0 ffff880322c28e78 ffffffff81c67a40 ffff880318666400 [ 202.898543] Call Trace: [ 202.898548] [] dump_stack+0x46/0x58 [ 202.898567] [] warn_slowpath_common+0x8c/0xc0 [ 202.898568] [] warn_slowpath_null+0x1a/0x20 [ 202.898570] [] bdev_inode_switch_bdi+0x86/0x90 [ 202.898572] [] __blkdev_put+0x81/0x1b0 [ 202.898573] [] blkdev_put+0x5b/0x160 [ 202.898576] [] kill_block_super+0x4d/0x80 [ 202.898579] [] deactivate_locked_super+0x59/0x80 [ 202.898585] [] deactivate_super+0x4e/0x70 [ 202.898591] [] cleanup_mnt+0x43/0x90 [ 202.898595] [] __cleanup_mnt+0x12/0x20 [ 202.898597] [] task_work_run+0xa7/0xe0 [ 202.898601] [] do_notify_resume+0xc7/0xd0 [ 202.898603] [] int_signal+0x12/0x17 [ 202.898604] ---[ end trace 57ba2b773f33f72c ]--- [ 206.975480] xhci_hcd 0000:00:14.0: Timeout while waiting for setup device command [ 207.179689] usb 2-1: device not accepting address 3, error -62 [ 221.508960] usb 2-5: new SuperSpeed USB device number 5 using xhci_hcd [ 221.528028] usb 2-5: New USB device found, idVendor=1f75, idProduct=0621 [ 221.528032] usb 2-5: New USB device strings: Mfr=4, Product=5, SerialNumber=6 [ 221.528034] usb 2-5: Product: Ext. HDD [ 221.528035] usb 2-5: Manufacturer: Innostor [ 221.528037] usb 2-5: SerialNumber: 20140313 [ 221.746137] usb-storage 2-5:1.0: USB Mass Storage device detected [ 221.746252] scsi host7: usb-storage 2-5:1.0 [ 224.203651] scsi 7:0:0:0: Direct-Access Innostor Ext. HDD PQ: 0 ANSI: 6 [ 224.203901] sd 7:0:0:0: Attached scsi generic sg3 type 0 [ 224.204169] sd 7:0:0:0: [sdc] 1953525168 512-byte logical blocks: (1.00 TB/931 GiB) [ 224.204517] sd 7:0:0:0: [sdc] Write Protect is off [ 224.204519] sd 7:0:0:0: [sdc] Mode Sense: 3b 00 00 00 [ 224.204861] sd 7:0:0:0: [sdc] No Caching mode page found [ 224.204863] sd 7:0:0:0: [sdc] Assuming drive cache: write through [ 224.235195] sdc: unknown partition table [ 224.261755] sd 7:0:0:0: [sdc] Attached SCSI disk [ 226.070088] EXT4-fs (dm-4): recovery complete [ 226.070236] EXT4-fs (dm-4): mounted filesystem with ordered data mode. Opts: (null) [ 247.788263] usb 2-5: USB disconnect, device number 5 [ 247.789633] scsi 7:0:0:0: rejecting I/O to offline device [ 247.789637] scsi 7:0:0:0: [sdc] killing request [ 247.789640] scsi 7:0:0:0: rejecting I/O to offline device [ 247.789641] scsi 7:0:0:0: [sdc] killing request [ 247.789642] scsi 7:0:0:0: rejecting I/O to dead device [ 247.789653] scsi 7:0:0:0: rejecting I/O to dead device [ 247.789660] scsi 7:0:0:0: [sdc] [ 247.789662] Result: hostbyte=DID_NO_CONNECT driverbyte=DRIVER_OK [ 247.789663] scsi 7:0:0:0: [sdc] CDB: [ 247.789664] Read(10): 28 00 00 0f 23 00 00 00 f0 00 [ 247.789669] blk_update_request: I/O error, dev sdc, sector 992000 [ 247.789679] scsi 7:0:0:0: [sdc] [ 247.789681] Result: hostbyte=DID_NO_CONNECT driverbyte=DRIVER_OK [ 247.789682] scsi 7:0:0:0: [sdc] CDB: [ 247.789683] Read(10): 28 00 00 0f 23 f0 00 00 10 00 [ 247.789688] blk_update_request: I/O error, dev sdc, sector 992240 [ 247.829800] Buffer I/O error on dev dm-4, logical block 244190112, async page read [ 247.829807] Buffer I/O error on dev dm-4, logical block 244190132, async page read [ 247.829813] Buffer I/O error on dev dm-4, logical block 244190133, async page read [ 247.829851] Buffer I/O error on dev dm-4, logical block 244190133, async page read [ 247.829853] Buffer I/O error on dev dm-4, logical block 244190133, async page read [ 247.829855] Buffer I/O error on dev dm-4, logical block 244190133, async page read [ 247.829857] Buffer I/O error on dev dm-4, logical block 244190133, async page read [ 247.829860] Buffer I/O error on dev dm-4, logical block 244190133, async page read [ 247.829862] Buffer I/O error on dev dm-4, logical block 244190126, async page read [ 247.829864] Buffer I/O error on dev dm-4, logical block 244190132, async page read [ 249.089853] JBD2: Error -5 detected when updating journal superblock for dm-4-8. [ 249.089907] Aborting journal on device dm-4-8. [ 249.089959] JBD2: Error -5 detected when updating journal superblock for dm-4-8. [ 252.813659] EXT4-fs error (device dm-4): ext4_put_super:789: Couldn't clean up the journal [ 252.813663] EXT4-fs (dm-4): Remounting filesystem read-only [ 252.813665] EXT4-fs (dm-4): previous I/O error to superblock detected [ 253.062546] xhci_hcd 0000:00:14.0: Command completion event does not match command [ 253.062550] xhci_hcd 0000:00:14.0: Timeout while waiting for setup device command [ 258.284830] xhci_hcd 0000:00:14.0: Timeout while waiting for setup device command [ 258.489081] usb 2-5: device not accepting address 6, error -62