Bug is still present in 10.10 Maverik: Plugging a Sansa Clip+ MP3 player into USB gives the following dmesg output: $ dmesg [34194.116309] hub 2-0:1.0: unable to enumerate USB device on port 4 [34195.884039] usb 2-4: new high speed USB device using ehci_hcd and address 8 [34196.023380] scsi11 : usb-storage 2-4:1.0 [34197.020929] scsi 11:0:0:0: Direct-Access SanDisk Sansa Clip+ 4GB v01. PQ: 0 ANSI: 0 [34197.021412] scsi 11:0:0:1: Direct-Access SanDisk Sansa Clip+ 4GB v01. PQ: 0 ANSI: 0 [34197.022056] sd 11:0:0:0: Attached scsi generic sg6 type 0 [34197.022274] sd 11:0:0:1: Attached scsi generic sg7 type 0 [34197.024413] sd 11:0:0:0: [sdf] 7683072 512-byte logical blocks: (3.93 GB/3.66 GiB) [34197.027268] sd 11:0:0:1: [sdg] Attached SCSI removable disk [34197.028738] sd 11:0:0:0: [sdf] Write Protect is off [34197.028744] sd 11:0:0:0: [sdf] Mode Sense: 04 00 00 00 [34197.028748] sd 11:0:0:0: [sdf] Assuming drive cache: write through [34197.031557] sd 11:0:0:0: [sdf] Assuming drive cache: write through [34197.031566] sdf: [34197.037913] sd 11:0:0:0: [sdf] Assuming drive cache: write through [34197.037919] sd 11:0:0:0: [sdf] Attached SCSI removable disk [34197.237720] usb 3-2: usbfs: USBDEVFS_CONTROL failed cmd gvfs-gphoto2-vo rqt 128 rq 6 len 1000 ret -110 [34198.409977] usb 3-2: usbfs: USBDEVFS_CONTROL failed cmd gvfs-gphoto2-vo rqt 128 rq 6 len 1000 ret -110 If one tries to mount it: $ sudo mount /dev/sdf /mnt mount: /dev/sdf is not a valid block device $ dmesg [34228.176043] usb 2-4: reset high speed USB device using ehci_hcd and address 8 [34238.692524] usb 2-4: reset high speed USB device using ehci_hcd and address 8 [34255.200532] usb 2-4: reset high speed USB device using ehci_hcd and address 8 [34255.736606] usb 2-4: reset high speed USB device using ehci_hcd and address 8 [34266.364106] usb 2-4: reset high speed USB device using ehci_hcd and address 8 [34266.800557] sd 11:0:0:0: Device offlined - not ready after error recovery [34266.800570] sd 11:0:0:0: [sdf] Unhandled error code [34266.800573] sd 11:0:0:0: [sdf] Result: hostbyte=DID_ABORT driverbyte=DRIVER_OK [34266.800578] sd 11:0:0:0: [sdf] CDB: Read(10): 28 00 00 44 0d 38 00 00 40 00 [34266.800590] end_request: I/O error, dev sdf, sector 4459832 [34266.800596] Buffer I/O error on device sdf, logical block 557479 [34266.800604] Buffer I/O error on device sdf, logical block 557480 [34266.800608] Buffer I/O error on device sdf, logical block 557481 [34266.800612] Buffer I/O error on device sdf, logical block 557482 [34266.800616] Buffer I/O error on device sdf, logical block 557483 [34266.800619] Buffer I/O error on device sdf, logical block 557484 [34266.800623] Buffer I/O error on device sdf, logical block 557485 [34266.800627] Buffer I/O error on device sdf, logical block 557486 [34266.800631] sd 11:0:0:0: rejecting I/O to offline device [34266.800747] sd 11:0:0:0: rejecting I/O to offline device [34266.800824] sd 11:0:0:0: rejecting I/O to offline device [34266.800845] sd 11:0:0:0: rejecting I/O to offline device [34266.800937] sd 11:0:0:0: rejecting I/O to offline device [34266.801001] sd 11:0:0:0: rejecting I/O to offline device [34266.801065] sd 11:0:0:0: rejecting I/O to offline device [34266.801110] sd 11:0:0:0: rejecting I/O to offline device [34266.801196] sd 11:0:0:0: rejecting I/O to offline device [34266.801259] sd 11:0:0:0: rejecting I/O to offline device [34266.801324] sd 11:0:0:0: rejecting I/O to offline device [34266.801370] sd 11:0:0:0: rejecting I/O to offline device [34266.801463] sd 11:0:0:0: rejecting I/O to offline device [34266.801529] sd 11:0:0:0: rejecting I/O to offline device [34266.801594] sd 11:0:0:0: rejecting I/O to offline device [34266.801640] sd 11:0:0:0: rejecting I/O to offline device [34266.801731] sd 11:0:0:0: rejecting I/O to offline device [34266.801796] sd 11:0:0:0: rejecting I/O to offline device [34266.801860] sd 11:0:0:0: rejecting I/O to offline device [34266.801905] sd 11:0:0:0: rejecting I/O to offline device [34266.801999] sd 11:0:0:0: rejecting I/O to offline device [34266.802064] sd 11:0:0:0: rejecting I/O to offline device [34266.802134] sd 11:0:0:0: rejecting I/O to offline device [34266.802187] sd 11:0:0:0: rejecting I/O to offline device [34266.802283] sd 11:0:0:0: rejecting I/O to offline device [34266.802349] sd 11:0:0:0: rejecting I/O to offline device [34266.802415] sd 11:0:0:0: rejecting I/O to offline device [34266.802461] sd 11:0:0:0: rejecting I/O to offline device [34266.802557] sd 11:0:0:0: rejecting I/O to offline device [34266.802624] sd 11:0:0:0: rejecting I/O to offline device [34266.802692] sd 11:0:0:0: rejecting I/O to offline device [34266.802743] sd 11:0:0:0: rejecting I/O to offline device [34266.802834] sd 11:0:0:0: rejecting I/O to offline device [34266.802900] sd 11:0:0:0: rejecting I/O to offline device [34266.802966] sd 11:0:0:0: rejecting I/O to offline device [34266.803016] sd 11:0:0:0: rejecting I/O to offline device [34266.803108] sd 11:0:0:0: rejecting I/O to offline device [34266.803176] sd 11:0:0:0: rejecting I/O to offline device [34266.803249] sd 11:0:0:0: rejecting I/O to offline device [34266.803296] sd 11:0:0:0: rejecting I/O to offline device [34266.803389] sd 11:0:0:0: rejecting I/O to offline device [34266.803456] sd 11:0:0:0: rejecting I/O to offline device [34266.803529] sd 11:0:0:0: rejecting I/O to offline device [34266.803577] sd 11:0:0:0: rejecting I/O to offline device [34266.803671] sd 11:0:0:0: rejecting I/O to offline device [34266.803739] sd 11:0:0:0: rejecting I/O to offline device [34266.803812] sd 11:0:0:0: rejecting I/O to offline device [34266.803859] sd 11:0:0:0: rejecting I/O to offline device [34266.803953] sd 11:0:0:0: rejecting I/O to offline device [34266.804027] sd 11:0:0:0: rejecting I/O to offline device [34266.804105] sd 11:0:0:0: rejecting I/O to offline device [34266.804154] sd 11:0:0:0: rejecting I/O to offline device [34266.804252] sd 11:0:0:0: rejecting I/O to offline device [34266.804328] sd 11:0:0:0: rejecting I/O to offline device [34266.804409] sd 11:0:0:0: rejecting I/O to offline device [34266.804463] sd 11:0:0:0: rejecting I/O to offline device [34266.804584] sd 11:0:0:0: rejecting I/O to offline device [34266.804656] sd 11:0:0:0: rejecting I/O to offline device [34266.804734] sd 11:0:0:0: rejecting I/O to offline device [34266.804784] sd 11:0:0:0: rejecting I/O to offline device [34266.804886] sd 11:0:0:0: rejecting I/O to offline device [34266.804961] sd 11:0:0:0: rejecting I/O to offline device [34266.805040] sd 11:0:0:0: rejecting I/O to offline device [34266.805090] sd 11:0:0:0: rejecting I/O to offline device [34266.805191] sd 11:0:0:0: rejecting I/O to offline device [34266.805267] sd 11:0:0:0: rejecting I/O to offline device [34266.805352] sd 11:0:0:0: rejecting I/O to offline device [34266.805430] sd 11:0:0:0: rejecting I/O to offline device [34266.805503] sd 11:0:0:0: rejecting I/O to offline device [34266.805583] sd 11:0:0:0: rejecting I/O to offline device [34266.805661] sd 11:0:0:0: rejecting I/O to offline device [34266.805743] sd 11:0:0:0: rejecting I/O to offline device [34266.805818] sd 11:0:0:0: rejecting I/O to offline device [34266.805874] sd 11:0:0:0: rejecting I/O to offline device [34266.806009] sd 11:0:0:0: rejecting I/O to offline device [34266.806093] sd 11:0:0:0: rejecting I/O to offline device [34266.806180] sd 11:0:0:0: rejecting I/O to offline device [34266.806312] sd 11:0:0:0: rejecting I/O to offline device [34266.806333] sd 11:0:0:0: rejecting I/O to offline device [34266.806352] sd 11:0:0:0: rejecting I/O to offline device [34266.806371] sd 11:0:0:0: rejecting I/O to offline device [34266.806393] sd 11:0:0:0: rejecting I/O to offline device [34266.806412] sd 11:0:0:0: rejecting I/O to offline device [34266.806431] sd 11:0:0:0: rejecting I/O to offline device [34266.806450] sd 11:0:0:0: rejecting I/O to offline device [34266.806473] sd 11:0:0:0: rejecting I/O to offline device [34266.806492] sd 11:0:0:0: rejecting I/O to offline device [34266.806511] sd 11:0:0:0: rejecting I/O to offline device [34266.806530] sd 11:0:0:0: rejecting I/O to offline device [34266.806552] sd 11:0:0:0: rejecting I/O to offline device [34266.806574] sd 11:0:0:0: rejecting I/O to offline device [34266.806593] sd 11:0:0:0: rejecting I/O to offline device [34266.806611] sd 11:0:0:0: rejecting I/O to offline device [34266.806630] sd 11:0:0:0: rejecting I/O to offline device [34266.806649] sd 11:0:0:0: rejecting I/O to offline device [34266.806674] sd 11:0:0:0: rejecting I/O to offline device [34266.806693] sd 11:0:0:0: rejecting I/O to offline device [34266.806715] sd 11:0:0:0: rejecting I/O to offline device [34266.806734] sd 11:0:0:0: rejecting I/O to offline device [34266.806756] sd 11:0:0:0: rejecting I/O to offline device [34266.806775] sd 11:0:0:0: rejecting I/O to offline device [34266.806804] sd 11:0:0:0: rejecting I/O to offline device [34266.806825] sd 11:0:0:0: rejecting I/O to offline device [34266.806848] sd 11:0:0:0: rejecting I/O to offline device [34266.806868] sd 11:0:0:0: rejecting I/O to offline device [34266.806889] sd 11:0:0:0: rejecting I/O to offline device [34266.806909] sd 11:0:0:0: rejecting I/O to offline device [34266.806941] sd 11:0:0:0: rejecting I/O to offline device [34266.806969] sd 11:0:0:0: rejecting I/O to offline device [34266.806989] sd 11:0:0:0: rejecting I/O to offline device [34266.807015] sd 11:0:0:0: rejecting I/O to offline device [34266.807034] sd 11:0:0:0: rejecting I/O to offline device [34266.807053] sd 11:0:0:0: rejecting I/O to offline device [34266.807073] sd 11:0:0:0: rejecting I/O to offline device [34266.807093] sd 11:0:0:0: rejecting I/O to offline device [34266.807116] sd 11:0:0:0: rejecting I/O to offline device [34290.112027] usb 2-3: reset high speed USB device using ehci_hcd and address 3 [34290.356031] usb 2-2: reset high speed USB device using ehci_hcd and address 2 [34297.168025] usb 2-4: reset high speed USB device using ehci_hcd and address 8 [34307.704025] usb 2-4: reset high speed USB device using ehci_hcd and address 8 [34320.276217] INFO: task udisks-daemon:2469 blocked for more than 120 seconds. [34320.276223] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [34320.276227] udisks-daemon D e10b9b78 0 2469 2466 0x00000000 [34320.276234] e10b9b88 00000086 00000002 e10b9b78 00000003 c05d89e0 c08c3700 c08c3700 [34320.276244] 8d32778f 00001f1a c08c3700 c08c3700 8d31f284 00001f1a 00000000 c08c3700 [34320.276254] c08c3700 e106e580 00000001 e10b9c48 7fffffff e10b9c4c e10b9bec c05c6f05 [34320.276264] Call Trace: [34320.276275] [] schedule_timeout+0x1a5/0x270 [34320.276281] [] ? mod_timer+0x12d/0x280 [34320.276287] [] ? kobject_put+0x1d/0x50 [34320.276292] [] ? _raw_spin_lock_irq+0x18/0x20 [34320.276297] [] wait_for_common+0xa6/0x120 [34320.276303] [] ? default_wake_function+0x0/0x20 [34320.276308] [] wait_for_completion+0x17/0x20 [34320.276314] [] blk_execute_rq+0x7a/0xd0 [34320.276319] [] ? blk_end_sync_rq+0x0/0x30 [34320.276324] [] ? get_request_wait+0x22/0x180 [34320.276329] [] ? blk_get_request+0x63/0x80 [34320.276335] [] scsi_execute+0xcc/0x120 [34320.276340] [] scsi_execute_req+0x8a/0x140 [34320.276344] [] ? kobject_put+0x1d/0x50 [34320.276350] [] ? scsi_dispatch_cmd+0x16d/0x2d0 [34320.276355] [] scsi_test_unit_ready+0x9d/0x1c0 [34320.276362] [] ? kmem_cache_alloc_notrace+0x91/0xb0 [34320.276367] [] sd_media_changed+0x169/0x240 [34320.276371] [] ? kobject_get+0x12/0x20 [34320.276377] [] check_disk_change+0x26/0x60 [34320.276381] [] sd_open+0x85/0x1d0 [34320.276386] [] ? kobject_get+0x12/0x20 [34320.276390] [] __blkdev_get+0xb6/0x380 [34320.276395] [] ? freed_request+0x2f/0x50 [34320.276400] [] blkdev_get+0xf/0x20 [34320.276404] [] blkdev_open+0xbb/0x100 [34320.276410] [] __dentry_open+0xc4/0x280 [34320.276414] [] nameidata_to_filp+0x59/0x70 [34320.276419] [] ? blkdev_open+0x0/0x100 [34320.276424] [] finish_open+0xbf/0x1a0 [34320.276429] [] ? dput+0x91/0x130 [34320.276433] [] do_last+0x66/0x3a0 [34320.276438] [] do_filp_open+0x19d/0x4c0 [34320.276444] [] do_sys_open+0x55/0x150 [34320.276449] [] ? fput+0x1d/0x30 [34320.276453] [] ? filp_close+0x4c/0x80 [34320.276458] [] sys_open+0x2e/0x40 [34320.276462] [] syscall_call+0x7/0xb [34320.276467] [] ? identify_cpu+0x74/0x229 [34324.220029] usb 2-4: reset high speed USB device using ehci_hcd and address 8 [34324.736451] usb 2-4: reset high speed USB device using ehci_hcd and address 8 [34335.368040] usb 2-4: reset high speed USB device using ehci_hcd and address 8 [34335.804384] sd 11:0:0:1: Device offlined - not ready after error recovery So the device is unusable. My current workaround is to delete everything from gvfs-backends that is gphoto related: $ sudo rm /usr/lib/gvfs/gvfs-gphoto2-volume-monitor /usr/lib/gvfs/gvfsd-gphoto2 /usr/share/gvfs/remote-volume-monitors/gphoto2.monitor /usr/share/gvfs/mounts/gphoto2.mount /usr/share/dbus-1/services/org.gtk.Private.GPhoto2VolumeMonitor.service I can't delete the whole package as many parts in Gnome relies on it for proper function (for example Rhythmbox will fail at http downloads when gvfs-backends is gone without warning)