I have exact the same problem since 10 days on our ESX 5.1 machine !
Before chrismas all usb-devices (disks, usb-sticks + an APC power supply) were detected.
They were also connected to different vm guests.
Now they were also detected
<quote># lsusb
Bus 02 Device 07: ID 13fd:1340 Initio Corporation
Bus 02 Device 06: ID 058f:6387 Alcor Micro Corp. Transcend JetFlash Flash Drive
Bus 02 Device 04: ID 152d:0539 JMicron Technology Corp. / JMicron USA Technology Corp.
Bus 02 Device 03: ID 051d:0002 American Power Conversion Uninterruptible Power Supply
Bus 02 Device 02: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub
Bus 02 Device 01: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 01 Device 02: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub
Bus 01 Device 01: ID 1d6b:0002 Linux Foundation 2.0 root hub</quote>
but not connected to an ESX storage adapter (vSphere client) and not possible to assign them to any vm guest anymore.
Here is the kernel.log <quote># cat /var/log/vmkernel.log | grep usb
#2014-01-07T07:15:41.263Z cpu0:4613)usb-storage: detected SCSI revision number 4 on vmhba32
2014-01-07T07:15:41.263Z cpu0:4613)usb-storage: patching inquiry data to change SCSI revision number from 4 to 2 on vmhba32
2014-01-07T07:15:41.263Z cpu0:4613)usb-storage: patching inquiry data to change removable media bit from 'off' to 'on' on vmhba32
VMB: 212: name: /ohci_usb.v00
VMB: 212: name: /uhci_usb.v00
VMB: 1359: Relocating module /ohci_usb.v00 to high memory
VMB: 1359: Relocating module /uhci_usb.v00 to high memory
2014-01-07T08:20:43.531Z cpu0:4096)VisorFSTar: 1743: ohci_usb.v00 for 0xe373 bytes
2014-01-07T08:20:43.536Z cpu0:4096)VisorFSTar: 1743: uhci_usb.v00 for 0xe4ca bytes
2014-01-07T08:20:47.301Z cpu3:4552)Loading module usb ...
2014-01-07T08:20:47.304Z cpu3:4552)Elf: 1852: module usb has license GPL
2014-01-07T08:20:47.306Z cpu3:4552)module heap vmklnx_usb: creation succeeded. id = 0x41000ee00000
2014-01-07T08:20:47.306Z cpu3:4552)<6>usbcore: registered new interface driver usbfs
2014-01-07T08:20:47.306Z cpu3:4552)<6>usbcore: registered new interface driver hub
2014-01-07T08:20:47.306Z cpu3:4552)<6>usbcore: registered new device driver usb
2014-01-07T08:20:47.306Z cpu3:4552)Mod: 4485: Initialization of usb succeeded with module ID 12.
2014-01-07T08:20:47.306Z cpu3:4552)usb loaded successfully.
2014-01-07T08:20:47.330Z cpu2:4554)IRQ: 240: 0x70 <ehci_hcd:usb1> sharable (entropy source), flags 0x10
2014-01-07T08:20:47.663Z cpu2:4554)<6>usb usb1: New USB device found, idVendor=1d6b, idProduct=0002
2014-01-07T08:20:47.663Z cpu2:4554)<6>usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1
2014-01-07T08:20:47.663Z cpu2:4554)<6>usb usb1: Product: EHCI Host Controller
2014-01-07T08:20:47.663Z cpu2:4554)<6>usb usb1: Manufacturer: vmklinux_9 ehci_hcd
2014-01-07T08:20:47.663Z cpu2:4554)<6>usb usb1: SerialNumber: 0000:00:1a.0
2014-01-07T08:20:47.664Z cpu2:4554)<6>usb usb1: device is not available for passthrough
2014-01-07T08:20:47.664Z cpu2:4554)<6>usb usb1: usbfs: registered usb0101
2014-01-07T08:20:47.668Z cpu2:4554)IRQ: 240: 0xa8 <ehci_hcd:usb2> sharable (entropy source), flags 0x10
2014-01-07T08:20:47.833Z cpu2:4554)<6>usb usb2: New USB device found, idVendor=1d6b, idProduct=0002
2014-01-07T08:20:47.833Z cpu2:4554)<6>usb usb2: New USB device strings: Mfr=3, Product=2, SerialNumber=1
2014-01-07T08:20:47.833Z cpu2:4554)<6>usb usb2: Product: EHCI Host Controller
2014-01-07T08:20:47.833Z cpu2:4554)<6>usb usb2: Manufacturer: vmklinux_9 ehci_hcd
2014-01-07T08:20:47.833Z cpu2:4554)<6>usb usb2: SerialNumber: 0000:00:1d.0
2014-01-07T08:20:47.834Z cpu2:4554)<6>usb usb2: device is not available for passthrough
2014-01-07T08:20:47.834Z cpu2:4554)<6>usb usb2: usbfs: registered usb0201
2014-01-07T08:20:47.856Z cpu4:4555)<6>usbcore: registered new interface driver usbhid
2014-01-07T08:20:47.992Z cpu2:4553)<6>usb 1-1: new high speed USB device using ehci_hcd and address 2
2014-01-07T08:20:48.150Z cpu2:4553)<6>usb 1-1: New USB device found, idVendor=8087, idProduct=0020
2014-01-07T08:20:48.150Z cpu2:4553)<6>usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
2014-01-07T08:20:48.151Z cpu4:4553)<6>usb 1-1: device is not available for passthrough
2014-01-07T08:20:48.151Z cpu4:4553)<6>usb 1-1: usbfs: registered usb0102
2014-01-07T08:20:48.275Z cpu0:4553)<6>usb 2-1: new high speed USB device using ehci_hcd and address 2
2014-01-07T08:20:48.434Z cpu0:4553)<6>usb 2-1: New USB device found, idVendor=8087, idProduct=0020
2014-01-07T08:20:48.434Z cpu0:4553)<6>usb 2-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
2014-01-07T08:20:48.436Z cpu0:4553)<6>usb 2-1: device is not available for passthrough
2014-01-07T08:20:48.436Z cpu0:4553)<6>usb 2-1: usbfs: registered usb0202
2014-01-07T08:20:48.724Z cpu0:4553)<6>usb 2-1.2: new low speed USB device using ehci_hcd and address 3
2014-01-07T08:20:48.942Z cpu0:4553)<6>usb 2-1.2: New USB device found, idVendor=051d, idProduct=0002
2014-01-07T08:20:48.942Z cpu0:4553)<6>usb 2-1.2: New USB device strings: Mfr=3, Product=1, SerialNumber=2
2014-01-07T08:20:48.942Z cpu0:4553)<6>usb 2-1.2: Product: Back-UPS RS 1200 LCD FW:848.H4 .I USB FW:H4
2014-01-07T08:20:48.942Z cpu0:4553)<6>usb 2-1.2: Manufacturer: American Power Conversion
2014-01-07T08:20:48.942Z cpu0:4553)<6>usb 2-1.2: SerialNumber: 3B1040X53540
2014-01-07T08:20:48.945Z cpu0:4553)<6>usbhid 2-1.2:1.0: not claiming non-bootable hid device
2014-01-07T08:20:48.945Z cpu0:4553)<6>usb 2-1.2: device is available for passthrough
2014-01-07T08:20:48.945Z cpu0:4553)<6>usb 2-1.2: usbfs: registered usb0203
2014-01-07T08:20:49.029Z cpu0:4553)<6>usb 2-1.3: new high speed USB device using ehci_hcd and address 4
2014-01-07T08:20:49.148Z cpu0:4553)<6>usb 2-1.3: New USB device found, idVendor=152d, idProduct=0539
2014-01-07T08:20:49.148Z cpu0:4553)<6>usb 2-1.3: New USB device strings: Mfr=1, Product=2, SerialNumber=5
2014-01-07T08:20:49.148Z cpu0:4553)<6>usb 2-1.3: Product: USB to ATA/ATAPI Bridge
2014-01-07T08:20:49.148Z cpu0:4553)<6>usb 2-1.3: Manufacturer: JMicron
2014-01-07T08:20:49.148Z cpu0:4553)<6>usb 2-1.3: SerialNumber: 246D2918610F
2014-01-07T08:20:49.149Z cpu0:4553)<6>usb 2-1.3: usbfs: registered usb0204
2014-01-07T08:20:49.232Z cpu0:4553)<6>usb 2-1.4: new high speed USB device using ehci_hcd and address 5
2014-01-07T08:20:49.351Z cpu0:4553)<6>usb 2-1.4: New USB device found, idVendor=13fd, idProduct=1340
2014-01-07T08:20:49.351Z cpu0:4553)<6>usb 2-1.4: New USB device strings: Mfr=1, Product=2, SerialNumber=3
2014-01-07T08:20:49.351Z cpu0:4553)<6>usb 2-1.4: Product: External
2014-01-07T08:20:49.351Z cpu0:4553)<6>usb 2-1.4: Manufacturer: Generic
2014-01-07T08:20:49.351Z cpu0:4553)<6>usb 2-1.4: SerialNumber: 533234364A44325A39313835
2014-01-07T08:20:49.351Z cpu0:4553)<6>usb 2-1.4: usbfs: registered usb0205
2014-01-07T08:20:49.436Z cpu0:4553)<6>usb 2-1.5: new high speed USB device using ehci_hcd and address 6
2014-01-07T08:20:49.640Z cpu4:4553)<6>usb 2-1.5: New USB device found, idVendor=058f, idProduct=6387
2014-01-07T08:20:49.640Z cpu4:4553)<6>usb 2-1.5: New USB device strings: Mfr=1, Product=2, SerialNumber=3
2014-01-07T08:20:49.640Z cpu4:4553)<6>usb 2-1.5: Product: Mass Storage
2014-01-07T08:20:49.640Z cpu4:4553)<6>usb 2-1.5: SerialNumber: 3B60FA77
2014-01-07T08:20:49.640Z cpu7:4553)<6>usb 2-1.5: usbfs: registered usb0206
2014-01-07T08:20:55.072Z cpu2:4612)Loading module usb-storage ...
2014-01-07T08:20:55.074Z cpu2:4612)Elf: 1852: module usb-storage has license GPL
2014-01-07T08:20:55.075Z cpu2:4612)module heap vmklnx_usb_storage: creation succeeded. id = 0x410009c00000
2014-01-07T08:20:55.075Z cpu2:4612)<6>usb 2-1.3: Vendor: 0x152d, Product: 0x0539, Revision: 0x0000
2014-01-07T08:20:55.075Z cpu2:4612)<6>usb 2-1.3: Interface Subclass: 0x06, Protocol: 0x50
2014-01-07T08:20:55.313Z cpu2:4612)WARNING: LinScsiLLD: scsi_add_host:601:vmkAdapter (usb-storage) sgMaxEntries rounded to 255. Reported size was 255
2014-01-07T08:20:55.314Z cpu2:4612)<6>usb-storage 2-1.3:1.0: interface is claimed by usb-storage
2014-01-07T08:20:55.314Z cpu2:4612)<6>usb 2-1.3: device is not available for passthrough
2014-01-07T08:20:55.314Z cpu2:4612)<6>usb 2-1.4: Vendor: 0x13fd, Product: 0x1340, Revision: 0x0210
2014-01-07T08:20:55.314Z cpu2:4612)<6>usb 2-1.4: Interface Subclass: 0x06, Protocol: 0x50
2014-01-07T08:20:55.314Z cpu2:4612)WARNING: LinScsiLLD: scsi_add_host:601:vmkAdapter (usb-storage) sgMaxEntries rounded to 255. Reported size was 255
2014-01-07T08:20:55.315Z cpu2:4612)<6>usb-storage 2-1.4:1.0: interface is claimed by usb-storage
2014-01-07T08:20:55.315Z cpu2:4612)<6>usb 2-1.4: device is not available for passthrough
2014-01-07T08:20:55.315Z cpu2:4612)<6>usb 2-1.5: Vendor: 0x058f, Product: 0x6387, Revision: 0x0103
2014-01-07T08:20:55.315Z cpu2:4612)<6>usb 2-1.5: Interface Subclass: 0x06, Protocol: 0x50
2014-01-07T08:20:55.315Z cpu2:4612)WARNING: LinScsiLLD: scsi_add_host:601:vmkAdapter (usb-storage) sgMaxEntries rounded to 255. Reported size was 255
2014-01-07T08:20:55.316Z cpu2:4612)<6>usb-storage 2-1.5:1.0: interface is claimed by usb-storage
2014-01-07T08:20:55.316Z cpu2:4612)<6>usb 2-1.5: device is not available for passthrough
2014-01-07T08:20:55.316Z cpu2:4612)<6>usbcore: registered new interface driver usb-storage
2014-01-07T08:20:55.316Z cpu2:4612)Mod: 4485: Initialization of usb-storage succeeded with module ID 55.
2014-01-07T08:20:55.316Z cpu2:4612)usb-storage loaded successfully.
2014-01-07T08:20:56.317Z cpu4:4613)usb-storage: detected SCSI revision number 2 on vmhba32
2014-01-07T08:20:56.317Z cpu4:4613)usb-storage: patching inquiry data to change removable media bit from 'off' to 'on' on vmhba32
2014-01-07T08:20:56.317Z cpu2:4615)usb-storage: detected SCSI revision number 4 on vmhba33
2014-01-07T08:20:56.317Z cpu2:4615)usb-storage: patching inquiry data to change SCSI revision number from 4 to 2 on vmhba33
2014-01-07T08:20:56.317Z cpu2:4615)usb-storage: patching inquiry data to change removable media bit from 'off' to 'on' on vmhba33
2014-01-07T08:20:56.318Z cpu7:4617)usb-storage: detected SCSI revision number 2 on vmhba34
2014-01-07T08:21:06.555Z cpu4:4615)usb-storage: detected SCSI revision number 4 on vmhba33
2014-01-07T08:21:06.555Z cpu4:4615)usb-storage: patching inquiry data to change SCSI revision number from 4 to 2 on vmhba33
2014-01-07T08:21:06.555Z cpu4:4615)usb-storage: patching inquiry data to change removable media bit from 'off' to 'on' on vmhba33
2014-01-07T08:21:06.593Z cpu7:4617)usb-storage: detected SCSI revision number 2 on vmhba34
2014-01-07T08:21:07.218Z cpu0:4613)usb-storage: detected SCSI revision number 2 on vmhba32
2014-01-07T08:21:07.218Z cpu0:4613)usb-storage: patching inquiry data to change removable media bit from 'off' to 'on' on vmhba32
2014-01-07T09:04:57.203Z cpu7:4553)<6>usb 2-1.4: USB disconnect, address 5
2014-01-07T09:04:57.203Z cpu6:4553)<6>usb 2-1.4: usbfs: unregistered usb0205
2014-01-07T09:05:08.714Z cpu1:4553)<6>usb 2-1.6: new high speed USB device using ehci_hcd and address 7
2014-01-07T09:05:08.833Z cpu1:4553)<6>usb 2-1.6: New USB device found, idVendor=13fd, idProduct=1340
2014-01-07T09:05:08.833Z cpu1:4553)<6>usb 2-1.6: New USB device strings: Mfr=1, Product=2, SerialNumber=3
2014-01-07T09:05:08.833Z cpu1:4553)<6>usb 2-1.6: Product: External
2014-01-07T09:05:08.833Z cpu1:4553)<6>usb 2-1.6: Manufacturer: Generic
2014-01-07T09:05:08.833Z cpu1:4553)<6>usb 2-1.6: SerialNumber: 533234364A44325A39313835
2014-01-07T09:05:08.833Z cpu1:4553)<6>usb 2-1.6: Vendor: 0x13fd, Product: 0x1340, Revision: 0x0210
2014-01-07T09:05:08.833Z cpu1:4553)<6>usb 2-1.6: Interface Subclass: 0x06, Protocol: 0x50
2014-01-07T09:05:08.834Z cpu1:4553)WARNING: LinScsiLLD: scsi_add_host:601:vmkAdapter (usb-storage) sgMaxEntries rounded to 255. Reported size was 255
2014-01-07T09:05:08.834Z cpu1:4553)<6>usb-storage 2-1.6:1.0: interface is claimed by usb-storage
2014-01-07T09:05:08.834Z cpu1:4553)<6>usb 2-1.6: device is not available for passthrough
2014-01-07T09:05:08.834Z cpu1:4553)<6>usb 2-1.6: usbfs: registered usb0207
2014-01-07T09:05:09.836Z cpu4:8584)usb-storage: detected SCSI revision number 4 on vmhba40
2014-01-07T09:05:09.836Z cpu4:8584)usb-storage: patching inquiry data to change SCSI revision number from 4 to 2 on vmhba40
2014-01-07T09:05:09.836Z cpu4:8584)usb-storage: patching inquiry data to change removable media bit from 'off' to 'on' on vmhba40
2014-01-07T09:05:09.837Z cpu4:8584)usb-storage: detected SCSI revision number 4 on vmhba40
2014-01-07T09:05:09.837Z cpu4:8584)usb-storage: patching inquiry data to change SCSI revision number from 4 to 2 on vmhba40
2014-01-07T09:05:09.837Z cpu4:8584)usb-storage: patching inquiry data to change removable media bit from 'off' to 'on' on vmhba40
2014-01-07T11:33:11.394Z cpu7:15668)<6>usb passthrough enabled; all eligible devices will be unclaimed by kernel drivers except for ESXi boot device vmhba34
2014-01-07T11:33:11.394Z cpu5:4535)<6>usb-storage 2-1.3:1.0: unclaiming vmhba32
2014-01-07T11:33:11.394Z cpu3:4536)<6>usb-storage 2-1.6:1.0: unclaiming vmhba40
2014-01-07T11:33:11.395Z cpu0:4535)<6>usb 2-1.3: device is available for passthrough
2014-01-07T11:33:11.395Z cpu3:4536)<6>usb 2-1.6: device is available for passthrough
2014-01-07T11:33:12.482Z cpu6:4617)usb-storage: detected SCSI revision number 2 on vmhba34
2014-01-07T11:34:37.070Z cpu1:4553)<6>usb 2-1.4: new high speed USB device using ehci_hcd and address 8
2014-01-07T11:34:37.182Z cpu2:4553)<6>usb 2-1.4: New USB device found, idVendor=8644, idProduct=800b
2014-01-07T11:34:37.182Z cpu2:4553)<6>usb 2-1.4: New USB device strings: Mfr=1, Product=2, SerialNumber=3
2014-01-07T11:34:37.182Z cpu2:4553)<6>usb 2-1.4: Product: USB Flash Disk
2014-01-07T11:34:37.183Z cpu2:4553)<6>usb 2-1.4: Manufacturer: General
2014-01-07T11:34:37.183Z cpu2:4553)<6>usb 2-1.4: SerialNumber: 0415FT0000000BA3
2014-01-07T11:34:37.183Z cpu2:4553)<6>usb 2-1.4: Vendor: 0x8644, Product: 0x800b, Revision: 0x0100
2014-01-07T11:34:37.183Z cpu2:4553)<6>usb 2-1.4: Interface Subclass: 0x06, Protocol: 0x50
2014-01-07T11:34:37.183Z cpu2:4553)WARNING: LinScsiLLD: scsi_add_host:601:vmkAdapter (usb-storage) sgMaxEntries rounded to 255. Reported size was 255
2014-01-07T11:34:37.184Z cpu2:4553)<6>usb-storage 2-1.4:1.0: interface is claimed by usb-storage
2014-01-07T11:34:37.184Z cpu2:4553)<6>usb 2-1.4: device is not available for passthrough
2014-01-07T11:34:37.184Z cpu2:4553)<6>usb 2-1.4: usbfs: registered usb0208
2014-01-07T11:34:38.185Z cpu5:15813)usb-storage: detected SCSI revision number 2 on vmhba41
2014-01-07T11:34:38.185Z cpu5:15813)usb-storage: setting peripheral qualifier to 'not connected' on vmhba41
2014-01-07T11:34:38.185Z cpu0:4537)<6>usb-storage 2-1.4:1.0: unclaiming vmhba41
2014-01-07T11:34:38.185Z cpu0:4537)<6>usb 2-1.4: device is available for passthrough
2014-01-07T11:48:36.290Z cpu5:4553)<6>usb 2-1.4: USB disconnect, address 8
2014-01-07T11:48:36.290Z cpu5:4553)<6>usb 2-1.4: usbfs: unregistered usb0208
2014-01-07T11:49:18.270Z cpu0:4553)<6>usb 2-1.4: new high speed USB device using ehci_hcd and address 9
2014-01-07T11:49:18.382Z cpu0:4553)<6>usb 2-1.4: New USB device found, idVendor=8644, idProduct=800b
2014-01-07T11:49:18.382Z cpu0:4553)<6>usb 2-1.4: New USB device strings: Mfr=1, Product=2, SerialNumber=3
2014-01-07T11:49:18.382Z cpu0:4553)<6>usb 2-1.4: Product: USB Flash Disk
2014-01-07T11:49:18.382Z cpu0:4553)<6>usb 2-1.4: Manufacturer: General
2014-01-07T11:49:18.382Z cpu0:4553)<6>usb 2-1.4: SerialNumber: 0415FT0000000BA3
2014-01-07T11:49:18.383Z cpu0:4553)<6>usb 2-1.4: Vendor: 0x8644, Product: 0x800b, Revision: 0x0100
2014-01-07T11:49:18.383Z cpu0:4553)<6>usb 2-1.4: Interface Subclass: 0x06, Protocol: 0x50
2014-01-07T11:49:18.383Z cpu0:4553)WARNING: LinScsiLLD: scsi_add_host:601:vmkAdapter (usb-storage) sgMaxEntries rounded to 255. Reported size was 255
2014-01-07T11:49:18.384Z cpu0:4553)<6>usb-storage 2-1.4:1.0: interface is claimed by usb-storage
2014-01-07T11:49:18.384Z cpu0:4553)<6>usb 2-1.4: device is not available for passthrough
2014-01-07T11:49:18.384Z cpu0:4553)<6>usb 2-1.4: usbfs: registered usb0209
2014-01-07T11:49:19.385Z cpu5:16466)usb-storage: detected SCSI revision number 2 on vmhba42
2014-01-07T11:49:19.385Z cpu5:16466)usb-storage: setting peripheral qualifier to 'not connected' on vmhba42
2014-01-07T11:49:19.385Z cpu0:4547)<6>usb-storage 2-1.4:1.0: unclaiming vmhba42
2014-01-07T11:49:19.385Z cpu2:4547)<6>usb 2-1.4: device is available for passthrough
2014-01-07T11:49:45.387Z cpu6:16513)<6>usb passthrough disabled
2014-01-07T11:49:49.340Z cpu6:16554)<6>usb passthrough enabled; all eligible devices will be unclaimed by kernel drivers except for ESXi boot device vmhba34
2014-01-07T11:49:50.312Z cpu1:4617)usb-storage: detected SCSI revision number 2 on vmhba34
2014-01-07T12:11:09.522Z cpu0:4617)usb-storage: detected SCSI revision number 2 on vmhba34
2014-01-07T12:27:32.400Z cpu0:4553)<6>usb 2-1.4: USB disconnect, address 9
2014-01-07T12:27:32.400Z cpu0:4553)<6>usb 2-1.4: usbfs: unregistered usb0209
2014-01-07T12:30:10.681Z cpu0:4617)usb-storage: detected SCSI revision number 2 on vmhba34
2014-01-07T13:38:01.618Z cpu0:4617)usb-storage: detected SCSI revision number 2 on vmhba34</quote>
I could´t find any errors ?
Any help is appreciated !