usb 6-1: USB disconnect, device number 69
BUG: MAX_STACK_TRACE_ENTRIES too low!
turning off the locking correctness validator.
CPU: 1 PID: 32668 Comm: kworker/1:1 Not tainted 5.2.0-rc6+ #15
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: usb_hub_wq hub_event
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0xca/0x13e lib/dump_stack.c:113
 save_trace kernel/locking/lockdep.c:453 [inline]
 save_trace.isra.0.cold+0x11/0x19 kernel/locking/lockdep.c:438
 mark_lock+0x2b9/0x10c0 kernel/locking/lockdep.c:3502
 __lock_acquire+0x54a/0x5340 kernel/locking/lockdep.c:3749
 lock_acquire+0x100/0x2b0 kernel/locking/lockdep.c:4303
 flush_workqueue+0x126/0x14c0 kernel/workqueue.c:2774
 scsi_remove_host+0x12d/0x360 drivers/scsi/hosts.c:178
 quiesce_and_remove_host drivers/usb/storage/usb.c:864 [inline]
 usb_stor_disconnect+0x106/0x230 drivers/usb/storage/usb.c:1084
 usb_unbind_interface+0x1bd/0x8a0 drivers/usb/core/driver.c:423
 __device_release_driver drivers/base/dd.c:1081 [inline]
 device_release_driver_internal+0x404/0x4c0 drivers/base/dd.c:1112
 bus_remove_device+0x2dc/0x4a0 drivers/base/bus.c:556
 device_del+0x460/0xb80 drivers/base/core.c:2274
 usb_disable_device+0x211/0x690 drivers/usb/core/message.c:1237
 usb_disconnect+0x284/0x830 drivers/usb/core/hub.c:2199
 hub_port_connect drivers/usb/core/hub.c:4949 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5213 [inline]
 port_event drivers/usb/core/hub.c:5359 [inline]
 hub_event+0x13bd/0x3550 drivers/usb/core/hub.c:5441
 process_one_work+0x905/0x1570 kernel/workqueue.c:2269
 worker_thread+0x96/0xe20 kernel/workqueue.c:2415
 kthread+0x30b/0x410 kernel/kthread.c:255
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
usb 6-1: new high-speed USB device number 70 using dummy_hcd
usb 6-1: Using ep0 maxpacket: 32
usb 6-1: config 1 has an invalid interface number: 51 but max is 0
usb 6-1: config 1 has no interface number 0
usb 6-1: config 1 interface 51 altsetting 0 bulk endpoint 0x8F has invalid maxpacket 0
usb 6-1: config 1 interface 51 altsetting 0 bulk endpoint 0x2 has invalid maxpacket 0
usb 6-1: New USB device found, idVendor=066b, idProduct=0105, bcdDevice= 1.00
usb 6-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
ums-sddr09 6-1:1.51: USB Mass Storage device detected
scsi host4: usb-storage 6-1:1.51
scsi 4:0:0:0: Direct-Access     Olympus  Camedia MAUSB-2  0100 PQ: 0 ANSI: 0
sd 4:0:0:0: Attached scsi generic sg3 type 0
usb 1-1: USB disconnect, device number 29
scsi 4:0:0:0: Direct-Access     Olympus  Camedia MAUSB-2  0100 PQ: 0 ANSI: 0
sd 4:0:0:0: Attached scsi generic sg1 type 0
scsi 5:0:0:0: Direct-Access     Olympus  Camedia MAUSB-2  0100 PQ: 0 ANSI: 0
sd 5:0:0:0: Attached scsi generic sg1 type 0
scsi 1:0:0:0: Direct-Access     Olympus  Camedia MAUSB-2  0100 PQ: 0 ANSI: 0
sd 1:0:0:0: Attached scsi generic sg1 type 0
usb 1-1: USB disconnect, device number 30
usb 1-1: new high-speed USB device number 31 using dummy_hcd
usb 1-1: Using ep0 maxpacket: 32
usb 1-1: config 1 has an invalid interface number: 51 but max is 0
usb 1-1: config 1 has no interface number 0
usb 1-1: config 1 interface 51 altsetting 0 bulk endpoint 0x8F has invalid maxpacket 0
usb 1-1: config 1 interface 51 altsetting 0 bulk endpoint 0x2 has invalid maxpacket 0
usb 1-1: New USB device found, idVendor=066b, idProduct=0105, bcdDevice= 1.00
usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0