====================================================== WARNING: possible circular locking dependency detected 5.14.0-rc1-syzkaller #0 Not tainted ------------------------------------------------------ kworker/1:12/12927 is trying to acquire lock: ffffffff8c7d6aa0 (fs_reclaim){+.+.}-{0:0}, at: __fs_reclaim_acquire+0x0/0x30 mm/page_alloc.c:4210 but task is already holding lock: ffff8880b9d4d0c8 (lock#2){-.-.}-{2:2}, at: local_lock_acquire+0x7/0x130 include/linux/local_lock_internal.h:41 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (lock#2){-.-.}-{2:2}: lock_acquire+0x182/0x4a0 kernel/locking/lockdep.c:5625 local_lock_acquire+0x23/0x130 include/linux/local_lock_internal.h:42 free_unref_page+0x242/0x550 mm/page_alloc.c:3427 mm_free_pgd kernel/fork.c:636 [inline] __mmdrop+0xae/0x3f0 kernel/fork.c:687 mmdrop include/linux/sched/mm.h:49 [inline] finish_task_switch+0x221/0x630 kernel/sched/core.c:4582 context_switch kernel/sched/core.c:4686 [inline] __schedule+0xc0f/0x11f0 kernel/sched/core.c:5940 preempt_schedule_irq+0xe3/0x190 kernel/sched/core.c:6328 irqentry_exit+0x56/0x90 kernel/entry/common.c:427 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638 lock_acquire+0x1e7/0x4a0 kernel/locking/lockdep.c:5629 __fs_reclaim_acquire+0x20/0x30 mm/page_alloc.c:4552 fs_reclaim_acquire+0x59/0xf0 mm/page_alloc.c:4566 prepare_alloc_pages+0x151/0x5a0 mm/page_alloc.c:5164 __alloc_pages+0x14d/0x5f0 mm/page_alloc.c:5363 alloc_pages_vma+0x520/0xe40 mm/mempolicy.c:2208 wp_page_copy+0x267/0x2180 mm/memory.c:3003 handle_pte_fault mm/memory.c:4567 [inline] __handle_mm_fault mm/memory.c:4684 [inline] handle_mm_fault+0x1dc5/0x2500 mm/memory.c:4782 do_user_addr_fault+0x8ce/0x10c0 arch/x86/mm/fault.c:1390 handle_page_fault arch/x86/mm/fault.c:1475 [inline] exc_page_fault+0xa1/0x1e0 arch/x86/mm/fault.c:1531 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:568 -> #0 (fs_reclaim){+.+.}-{0:0}: check_prev_add kernel/locking/lockdep.c:3051 [inline] check_prevs_add+0x4f9/0x5b30 kernel/locking/lockdep.c:3174 validate_chain kernel/locking/lockdep.c:3789 [inline] __lock_acquire+0x4476/0x6100 kernel/locking/lockdep.c:5015 lock_acquire+0x182/0x4a0 kernel/locking/lockdep.c:5625 __fs_reclaim_acquire+0x20/0x30 mm/page_alloc.c:4552 fs_reclaim_acquire+0x59/0xf0 mm/page_alloc.c:4566 prepare_alloc_pages+0x151/0x5a0 mm/page_alloc.c:5164 __alloc_pages+0x14d/0x5f0 mm/page_alloc.c:5363 stack_depot_save+0x361/0x490 lib/stackdepot.c:303 save_stack+0xf9/0x1f0 mm/page_owner.c:120 __set_page_owner+0x42/0x2f0 mm/page_owner.c:181 prep_new_page mm/page_alloc.c:2433 [inline] __alloc_pages_bulk+0x9f2/0x1090 mm/page_alloc.c:5301 alloc_pages_bulk_array_node include/linux/gfp.h:557 [inline] vm_area_alloc_pages mm/vmalloc.c:2793 [inline] __vmalloc_area_node mm/vmalloc.c:2863 [inline] __vmalloc_node_range+0x3ad/0x7f0 mm/vmalloc.c:2966 __vmalloc_node mm/vmalloc.c:3015 [inline] vzalloc+0x75/0x80 mm/vmalloc.c:3085 hid_open_report+0x265/0x1010 drivers/hid/hid-core.c:1233 hid_parse include/linux/hid.h:1051 [inline] wacom_probe+0x8cf/0xa80 drivers/hid/wacom_sys.c:2776 hid_device_probe+0x26c/0x410 drivers/hid/hid-core.c:2287 call_driver_probe+0x96/0x250 drivers/base/dd.c:517 really_probe+0x223/0x9c0 drivers/base/dd.c:595 __driver_probe_device+0x1f8/0x3e0 drivers/base/dd.c:747 driver_probe_device+0x50/0x240 drivers/base/dd.c:777 __device_attach_driver+0x1e1/0x3b0 drivers/base/dd.c:894 bus_for_each_drv+0x16a/0x1f0 drivers/base/bus.c:427 __device_attach+0x301/0x560 drivers/base/dd.c:965 bus_probe_device+0xb8/0x1f0 drivers/base/bus.c:487 device_add+0x1295/0x1790 drivers/base/core.c:3352 hid_add_device+0xdd2/0x1030 drivers/hid/hid-core.c:2439 usbhid_probe+0xb4c/0xed0 drivers/hid/usbhid/hid-core.c:1417 usb_probe_interface+0x633/0xb40 drivers/usb/core/driver.c:396 call_driver_probe+0x96/0x250 drivers/base/dd.c:517 really_probe+0x223/0x9c0 drivers/base/dd.c:595 __driver_probe_device+0x1f8/0x3e0 drivers/base/dd.c:747 driver_probe_device+0x50/0x240 drivers/base/dd.c:777 __device_attach_driver+0x1e1/0x3b0 drivers/base/dd.c:894 bus_for_each_drv+0x16a/0x1f0 drivers/base/bus.c:427 __device_attach+0x301/0x560 drivers/base/dd.c:965 bus_probe_device+0xb8/0x1f0 drivers/base/bus.c:487 device_add+0x1295/0x1790 drivers/base/core.c:3352 usb_set_configuration+0x1a86/0x2100 drivers/usb/core/message.c:2170 usb_generic_driver_probe+0x83/0x140 drivers/usb/core/generic.c:238 usb_probe_device+0x13a/0x260 drivers/usb/core/driver.c:293 call_driver_probe+0x96/0x250 drivers/base/dd.c:517 really_probe+0x223/0x9c0 drivers/base/dd.c:595 __driver_probe_device+0x1f8/0x3e0 drivers/base/dd.c:747 driver_probe_device+0x50/0x240 drivers/base/dd.c:777 __device_attach_driver+0x1e1/0x3b0 drivers/base/dd.c:894 bus_for_each_drv+0x16a/0x1f0 drivers/base/bus.c:427 __device_attach+0x301/0x560 drivers/base/dd.c:965 bus_probe_device+0xb8/0x1f0 drivers/base/bus.c:487 device_add+0x1295/0x1790 drivers/base/core.c:3352 usb_new_device+0x108a/0x1940 drivers/usb/core/hub.c:2559 hub_port_connect+0x1055/0x27a0 drivers/usb/core/hub.c:5300 hub_port_connect_change+0x5d0/0xbf0 drivers/usb/core/hub.c:5440 port_event+0xaee/0x1140 drivers/usb/core/hub.c:5586 hub_event+0x48d/0xd80 drivers/usb/core/hub.c:5668 process_one_work+0x833/0x10c0 kernel/workqueue.c:2276 worker_thread+0xac1/0x1320 kernel/workqueue.c:2422 kthread+0x453/0x480 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(lock#2); lock(fs_reclaim); lock(lock#2); lock(fs_reclaim); *** DEADLOCK *** 7 locks held by kworker/1:12/12927: #0: ffff88801974c138 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x7aa/0x10c0 kernel/workqueue.c:2249 #1: ffffc9000416fd20 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x7e8/0x10c0 kernel/workqueue.c:2251 #2: ffff888146a7e220 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:754 [inline] #2: ffff888146a7e220 (&dev->mutex){....}-{3:3}, at: hub_event+0x157/0xd80 drivers/usb/core/hub.c:5614 #3: ffff88806d547220 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:754 [inline] #3: ffff88806d547220 (&dev->mutex){....}-{3:3}, at: __device_attach+0x8a/0x560 drivers/base/dd.c:940 #4: ffff88806cac71a8 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:754 [inline] #4: ffff88806cac71a8 (&dev->mutex){....}-{3:3}, at: __device_attach+0x8a/0x560 drivers/base/dd.c:940 #5: ffff888088f8dab0 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:754 [inline] #5: ffff888088f8dab0 (&dev->mutex){....}-{3:3}, at: __device_attach+0x8a/0x560 drivers/base/dd.c:940 #6: ffff8880b9d4d0c8 (lock#2){-.-.}-{2:2}, at: local_lock_acquire+0x7/0x130 include/linux/local_lock_internal.h:41 stack backtrace: CPU: 1 PID: 12927 Comm: kworker/1:12 Not tainted 5.14.0-rc1-syzkaller #0 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:88 [inline] dump_stack_lvl+0x1ae/0x29f lib/dump_stack.c:105 print_circular_bug+0xb17/0xdc0 kernel/locking/lockdep.c:2009 check_noncircular+0x2cc/0x390 kernel/locking/lockdep.c:2131 check_prev_add kernel/locking/lockdep.c:3051 [inline] check_prevs_add+0x4f9/0x5b30 kernel/locking/lockdep.c:3174 validate_chain kernel/locking/lockdep.c:3789 [inline] __lock_acquire+0x4476/0x6100 kernel/locking/lockdep.c:5015 lock_acquire+0x182/0x4a0 kernel/locking/lockdep.c:5625 __fs_reclaim_acquire+0x20/0x30 mm/page_alloc.c:4552 fs_reclaim_acquire+0x59/0xf0 mm/page_alloc.c:4566 prepare_alloc_pages+0x151/0x5a0 mm/page_alloc.c:5164 __alloc_pages+0x14d/0x5f0 mm/page_alloc.c:5363 stack_depot_save+0x361/0x490 lib/stackdepot.c:303 save_stack+0xf9/0x1f0 mm/page_owner.c:120 __set_page_owner+0x42/0x2f0 mm/page_owner.c:181 prep_new_page mm/page_alloc.c:2433 [inline] __alloc_pages_bulk+0x9f2/0x1090 mm/page_alloc.c:5301 alloc_pages_bulk_array_node include/linux/gfp.h:557 [inline] vm_area_alloc_pages mm/vmalloc.c:2793 [inline] __vmalloc_area_node mm/vmalloc.c:2863 [inline] __vmalloc_node_range+0x3ad/0x7f0 mm/vmalloc.c:2966 __vmalloc_node mm/vmalloc.c:3015 [inline] vzalloc+0x75/0x80 mm/vmalloc.c:3085 hid_open_report+0x265/0x1010 drivers/hid/hid-core.c:1233 hid_parse include/linux/hid.h:1051 [inline] wacom_probe+0x8cf/0xa80 drivers/hid/wacom_sys.c:2776 hid_device_probe+0x26c/0x410 drivers/hid/hid-core.c:2287 call_driver_probe+0x96/0x250 drivers/base/dd.c:517 really_probe+0x223/0x9c0 drivers/base/dd.c:595 __driver_probe_device+0x1f8/0x3e0 drivers/base/dd.c:747 driver_probe_device+0x50/0x240 drivers/base/dd.c:777 __device_attach_driver+0x1e1/0x3b0 drivers/base/dd.c:894 bus_for_each_drv+0x16a/0x1f0 drivers/base/bus.c:427 __device_attach+0x301/0x560 drivers/base/dd.c:965 bus_probe_device+0xb8/0x1f0 drivers/base/bus.c:487 device_add+0x1295/0x1790 drivers/base/core.c:3352 hid_add_device+0xdd2/0x1030 drivers/hid/hid-core.c:2439 usbhid_probe+0xb4c/0xed0 drivers/hid/usbhid/hid-core.c:1417 usb_probe_interface+0x633/0xb40 drivers/usb/core/driver.c:396 call_driver_probe+0x96/0x250 drivers/base/dd.c:517 really_probe+0x223/0x9c0 drivers/base/dd.c:595 __driver_probe_device+0x1f8/0x3e0 drivers/base/dd.c:747 driver_probe_device+0x50/0x240 drivers/base/dd.c:777 __device_attach_driver+0x1e1/0x3b0 drivers/base/dd.c:894 bus_for_each_drv+0x16a/0x1f0 drivers/base/bus.c:427 __device_attach+0x301/0x560 drivers/base/dd.c:965 bus_probe_device+0xb8/0x1f0 drivers/base/bus.c:487 device_add+0x1295/0x1790 drivers/base/core.c:3352 usb_set_configuration+0x1a86/0x2100 drivers/usb/core/message.c:2170 usb_generic_driver_probe+0x83/0x140 drivers/usb/core/generic.c:238 usb_probe_device+0x13a/0x260 drivers/usb/core/driver.c:293 call_driver_probe+0x96/0x250 drivers/base/dd.c:517 really_probe+0x223/0x9c0 drivers/base/dd.c:595 __driver_probe_device+0x1f8/0x3e0 drivers/base/dd.c:747 driver_probe_device+0x50/0x240 drivers/base/dd.c:777 __device_attach_driver+0x1e1/0x3b0 drivers/base/dd.c:894 bus_for_each_drv+0x16a/0x1f0 drivers/base/bus.c:427 __device_attach+0x301/0x560 drivers/base/dd.c:965 bus_probe_device+0xb8/0x1f0 drivers/base/bus.c:487 device_add+0x1295/0x1790 drivers/base/core.c:3352 usb_new_device+0x108a/0x1940 drivers/usb/core/hub.c:2559 hub_port_connect+0x1055/0x27a0 drivers/usb/core/hub.c:5300 hub_port_connect_change+0x5d0/0xbf0 drivers/usb/core/hub.c:5440 port_event+0xaee/0x1140 drivers/usb/core/hub.c:5586 hub_event+0x48d/0xd80 drivers/usb/core/hub.c:5668 process_one_work+0x833/0x10c0 kernel/workqueue.c:2276 worker_thread+0xac1/0x1320 kernel/workqueue.c:2422 kthread+0x453/0x480 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 BUG: sleeping function called from invalid context at mm/page_alloc.c:5167 in_atomic(): 0, irqs_disabled(): 1, non_block: 0, pid: 12927, name: kworker/1:12 INFO: lockdep is turned off. irq event stamp: 16331510 hardirqs last enabled at (16331509): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] hardirqs last enabled at (16331509): [] _raw_spin_unlock_irqrestore+0x8b/0x120 kernel/locking/spinlock.c:191 hardirqs last disabled at (16331510): [] __alloc_pages_bulk+0x801/0x1090 mm/page_alloc.c:5279 softirqs last enabled at (16329692): [] invoke_softirq kernel/softirq.c:432 [inline] softirqs last enabled at (16329692): [] __irq_exit_rcu+0x21b/0x260 kernel/softirq.c:636 softirqs last disabled at (16329679): [] invoke_softirq kernel/softirq.c:432 [inline] softirqs last disabled at (16329679): [] __irq_exit_rcu+0x21b/0x260 kernel/softirq.c:636 CPU: 1 PID: 12927 Comm: kworker/1:12 Not tainted 5.14.0-rc1-syzkaller #0 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:88 [inline] dump_stack_lvl+0x1ae/0x29f lib/dump_stack.c:105 ___might_sleep+0x4e5/0x6b0 kernel/sched/core.c:9154 prepare_alloc_pages+0x1c0/0x5a0 mm/page_alloc.c:5167 __alloc_pages+0x14d/0x5f0 mm/page_alloc.c:5363 stack_depot_save+0x361/0x490 lib/stackdepot.c:303 save_stack+0xf9/0x1f0 mm/page_owner.c:120 __set_page_owner+0x42/0x2f0 mm/page_owner.c:181 prep_new_page mm/page_alloc.c:2433 [inline] __alloc_pages_bulk+0x9f2/0x1090 mm/page_alloc.c:5301 alloc_pages_bulk_array_node include/linux/gfp.h:557 [inline] vm_area_alloc_pages mm/vmalloc.c:2793 [inline] __vmalloc_area_node mm/vmalloc.c:2863 [inline] __vmalloc_node_range+0x3ad/0x7f0 mm/vmalloc.c:2966 __vmalloc_node mm/vmalloc.c:3015 [inline] vzalloc+0x75/0x80 mm/vmalloc.c:3085 hid_open_report+0x265/0x1010 drivers/hid/hid-core.c:1233 hid_parse include/linux/hid.h:1051 [inline] wacom_probe+0x8cf/0xa80 drivers/hid/wacom_sys.c:2776 hid_device_probe+0x26c/0x410 drivers/hid/hid-core.c:2287 call_driver_probe+0x96/0x250 drivers/base/dd.c:517 really_probe+0x223/0x9c0 drivers/base/dd.c:595 __driver_probe_device+0x1f8/0x3e0 drivers/base/dd.c:747 driver_probe_device+0x50/0x240 drivers/base/dd.c:777 __device_attach_driver+0x1e1/0x3b0 drivers/base/dd.c:894 bus_for_each_drv+0x16a/0x1f0 drivers/base/bus.c:427 __device_attach+0x301/0x560 drivers/base/dd.c:965 bus_probe_device+0xb8/0x1f0 drivers/base/bus.c:487 device_add+0x1295/0x1790 drivers/base/core.c:3352 hid_add_device+0xdd2/0x1030 drivers/hid/hid-core.c:2439 usbhid_probe+0xb4c/0xed0 drivers/hid/usbhid/hid-core.c:1417 usb_probe_interface+0x633/0xb40 drivers/usb/core/driver.c:396 call_driver_probe+0x96/0x250 drivers/base/dd.c:517 really_probe+0x223/0x9c0 drivers/base/dd.c:595 __driver_probe_device+0x1f8/0x3e0 drivers/base/dd.c:747 driver_probe_device+0x50/0x240 drivers/base/dd.c:777 __device_attach_driver+0x1e1/0x3b0 drivers/base/dd.c:894 bus_for_each_drv+0x16a/0x1f0 drivers/base/bus.c:427 __device_attach+0x301/0x560 drivers/base/dd.c:965 bus_probe_device+0xb8/0x1f0 drivers/base/bus.c:487 device_add+0x1295/0x1790 drivers/base/core.c:3352 usb_set_configuration+0x1a86/0x2100 drivers/usb/core/message.c:2170 usb_generic_driver_probe+0x83/0x140 drivers/usb/core/generic.c:238 usb_probe_device+0x13a/0x260 drivers/usb/core/driver.c:293 call_driver_probe+0x96/0x250 drivers/base/dd.c:517 really_probe+0x223/0x9c0 drivers/base/dd.c:595 __driver_probe_device+0x1f8/0x3e0 drivers/base/dd.c:747 driver_probe_device+0x50/0x240 drivers/base/dd.c:777 __device_attach_driver+0x1e1/0x3b0 drivers/base/dd.c:894 bus_for_each_drv+0x16a/0x1f0 drivers/base/bus.c:427 __device_attach+0x301/0x560 drivers/base/dd.c:965 bus_probe_device+0xb8/0x1f0 drivers/base/bus.c:487 device_add+0x1295/0x1790 drivers/base/core.c:3352 usb_new_device+0x108a/0x1940 drivers/usb/core/hub.c:2559 hub_port_connect+0x1055/0x27a0 drivers/usb/core/hub.c:5300 hub_port_connect_change+0x5d0/0xbf0 drivers/usb/core/hub.c:5440 port_event+0xaee/0x1140 drivers/usb/core/hub.c:5586 hub_event+0x48d/0xd80 drivers/usb/core/hub.c:5668 process_one_work+0x833/0x10c0 kernel/workqueue.c:2276 worker_thread+0xac1/0x1320 kernel/workqueue.c:2422 kthread+0x453/0x480 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 wacom 0003:056A:0034.0004: unknown main item tag 0x0 wacom 0003:056A:0034.0004: unknown main item tag 0x0 wacom 0003:056A:0034.0004: unknown main item tag 0x0 wacom 0003:056A:0034.0004: unknown main item tag 0x0 wacom 0003:056A:0034.0004: unknown main item tag 0x0 wacom 0003:056A:0034.0004: unknown main item tag 0x0 wacom 0003:056A:0034.0004: unknown main item tag 0x0 wacom 0003:056A:0034.0004: unknown main item tag 0x0 wacom 0003:056A:0034.0004: unknown main item tag 0x0 wacom 0003:056A:0034.0004: unknown main item tag 0x0 wacom 0003:056A:0034.0004: unknown main item tag 0x0 wacom 0003:056A:0034.0004: unknown main item tag 0x0 wacom 0003:056A:0034.0004: unknown main item tag 0x0 wacom 0003:056A:0034.0004: unknown main item tag 0x0 wacom 0003:056A:0034.0004: unknown main item tag 0x0 wacom 0003:056A:0034.0004: unknown main item tag 0x0 wacom 0003:056A:0034.0004: unknown main item tag 0x0 wacom 0003:056A:0034.0004: unknown main item tag 0x0 wacom 0003:056A:0034.0004: unknown main item tag 0x0 wacom 0003:056A:0034.0004: unknown main item tag 0x0 wacom 0003:056A:0034.0004: unknown main item tag 0x0 wacom 0003:056A:0034.0004: unknown main item tag 0x0 wacom 0003:056A:0034.0004: unknown main item tag 0x0 wacom 0003:056A:0034.0004: unknown main item tag 0x0 wacom 0003:056A:0034.0004: unknown main item tag 0x0 wacom 0003:056A:0034.0004: unknown main item tag 0x0 wacom 0003:056A:0034.0004: unknown main item tag 0x0 wacom 0003:056A:0034.0004: unknown main item tag 0x0 wacom 0003:056A:0034.0004: unknown main item tag 0x0 wacom 0003:056A:0034.0004: unknown main item tag 0x0 wacom 0003:056A:0034.0004: unknown main item tag 0x0 wacom 0003:056A:0034.0004: unknown main item tag 0x0 wacom 0003:056A:0034.0004: unknown main item tag 0x0 wacom 0003:056A:0034.0004: unknown main item tag 0x0 wacom 0003:056A:0034.0004: unknown main item tag 0x0 wacom 0003:056A:0034.0004: unknown main item tag 0x0 wacom 0003:056A:0034.0004: unknown main item tag 0x0 wacom 0003:056A:0034.0004: unknown main item tag 0x0 wacom 0003:056A:0034.0004: hidraw0: USB HID v0.00 Device [HID 056a:0034] on usb-dummy_hcd.3-1/input0 usb 4-1: USB disconnect, device number 6 usb 4-1: new high-speed USB device number 7 using dummy_hcd usb 4-1: config 0 has an invalid descriptor of length 0, skipping remainder of the config usb 4-1: config 0 interface 0 altsetting 0 endpoint 0x81 has an invalid bInterval 0, changing to 7 usb 4-1: config 0 interface 0 altsetting 0 endpoint 0x81 has invalid wMaxPacketSize 0 usb 4-1: config 0 interface 0 altsetting 0 has 1 endpoint descriptor, different from the interface descriptor's value: 9 usb 4-1: New USB device found, idVendor=056a, idProduct=0034, bcdDevice= 0.00 usb 4-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0 usb 4-1: config 0 descriptor?? wacom 0003:056A:0034.0005: unknown main item tag 0x0 wacom 0003:056A:0034.0005: unknown main item tag 0x0 wacom 0003:056A:0034.0005: unknown main item tag 0x0 wacom 0003:056A:0034.0005: unknown main item tag 0x0 wacom 0003:056A:0034.0005: unknown main item tag 0x0 wacom 0003:056A:0034.0005: unknown main item tag 0x0 wacom 0003:056A:0034.0005: unknown main item tag 0x0 wacom 0003:056A:0034.0005: unknown main item tag 0x0 wacom 0003:056A:0034.0005: unknown main item tag 0x0 wacom 0003:056A:0034.0005: unknown main item tag 0x0 wacom 0003:056A:0034.0005: unknown main item tag 0x0 wacom 0003:056A:0034.0005: unknown main item tag 0x0 wacom 0003:056A:0034.0005: unknown main item tag 0x0 wacom 0003:056A:0034.0005: unknown main item tag 0x0 wacom 0003:056A:0034.0005: unknown main item tag 0x0 wacom 0003:056A:0034.0005: unknown main item tag 0x0 wacom 0003:056A:0034.0005: unknown main item tag 0x0 wacom 0003:056A:0034.0005: unknown main item tag 0x0 wacom 0003:056A:0034.0005: unknown main item tag 0x0 wacom 0003:056A:0034.0005: unknown main item tag 0x0 wacom 0003:056A:0034.0005: unknown main item tag 0x0 wacom 0003:056A:0034.0005: unknown main item tag 0x0 wacom 0003:056A:0034.0005: unknown main item tag 0x0 wacom 0003:056A:0034.0005: unknown main item tag 0x0 wacom 0003:056A:0034.0005: unknown main item tag 0x0 wacom 0003:056A:0034.0005: unknown main item tag 0x0 wacom 0003:056A:0034.0005: unknown main item tag 0x0 wacom 0003:056A:0034.0005: unknown main item tag 0x0 wacom 0003:056A:0034.0005: unknown main item tag 0x0 wacom 0003:056A:0034.0005: unknown main item tag 0x0 wacom 0003:056A:0034.0005: unknown main item tag 0x0 wacom 0003:056A:0034.0005: unknown main item tag 0x0 wacom 0003:056A:0034.0005: unknown main item tag 0x0 wacom 0003:056A:0034.0005: unknown main item tag 0x0 wacom 0003:056A:0034.0005: unknown main item tag 0x0 wacom 0003:056A:0034.0005: unknown main item tag 0x0 wacom 0003:056A:0034.0005: unknown main item tag 0x0 wacom 0003:056A:0034.0005: unknown main item tag 0x0 wacom 0003:056A:0034.0005: hidraw0: USB HID v0.00 Device [HID 056a:0034] on usb-dummy_hcd.3-1/input0 usb 4-1: USB disconnect, device number 7 usb 4-1: new high-speed USB device number 8 using dummy_hcd usb 4-1: config 0 has an invalid descriptor of length 0, skipping remainder of the config usb 4-1: config 0 interface 0 altsetting 0 endpoint 0x81 has an invalid bInterval 0, changing to 7 usb 4-1: config 0 interface 0 altsetting 0 endpoint 0x81 has invalid wMaxPacketSize 0 usb 4-1: config 0 interface 0 altsetting 0 has 1 endpoint descriptor, different from the interface descriptor's value: 9 usb 4-1: New USB device found, idVendor=056a, idProduct=0034, bcdDevice= 0.00 usb 4-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0 usb 4-1: config 0 descriptor?? wacom 0003:056A:0034.0006: unknown main item tag 0x0 wacom 0003:056A:0034.0006: unknown main item tag 0x0 wacom 0003:056A:0034.0006: unknown main item tag 0x0 wacom 0003:056A:0034.0006: unknown main item tag 0x0 wacom 0003:056A:0034.0006: unknown main item tag 0x0 wacom 0003:056A:0034.0006: unknown main item tag 0x0 wacom 0003:056A:0034.0006: unknown main item tag 0x0 wacom 0003:056A:0034.0006: unknown main item tag 0x0 wacom 0003:056A:0034.0006: unknown main item tag 0x0 wacom 0003:056A:0034.0006: unknown main item tag 0x0 wacom 0003:056A:0034.0006: unknown main item tag 0x0 wacom 0003:056A:0034.0006: unknown main item tag 0x0 wacom 0003:056A:0034.0006: unknown main item tag 0x0 wacom 0003:056A:0034.0006: unknown main item tag 0x0 wacom 0003:056A:0034.0006: unknown main item tag 0x0 wacom 0003:056A:0034.0006: unknown main item tag 0x0 wacom 0003:056A:0034.0006: unknown main item tag 0x0 wacom 0003:056A:0034.0006: unknown main item tag 0x0 wacom 0003:056A:0034.0006: unknown main item tag 0x0 wacom 0003:056A:0034.0006: unknown main item tag 0x0 wacom 0003:056A:0034.0006: unknown main item tag 0x0 wacom 0003:056A:0034.0006: unknown main item tag 0x0 wacom 0003:056A:0034.0006: unknown main item tag 0x0 wacom 0003:056A:0034.0006: unknown main item tag 0x0 wacom 0003:056A:0034.0006: unknown main item tag 0x0 wacom 0003:056A:0034.0006: unknown main item tag 0x0 wacom 0003:056A:0034.0006: unknown main item tag 0x0 wacom 0003:056A:0034.0006: unknown main item tag 0x0 wacom 0003:056A:0034.0006: unknown main item tag 0x0 wacom 0003:056A:0034.0006: unknown main item tag 0x0 wacom 0003:056A:0034.0006: unknown main item tag 0x0 wacom 0003:056A:0034.0006: unknown main item tag 0x0 wacom 0003:056A:0034.0006: unknown main item tag 0x0 wacom 0003:056A:0034.0006: unknown main item tag 0x0 wacom 0003:056A:0034.0006: unknown main item tag 0x0 wacom 0003:056A:0034.0006: unknown main item tag 0x0 wacom 0003:056A:0034.0006: unknown main item tag 0x0 wacom 0003:056A:0034.0006: unknown main item tag 0x0 wacom 0003:056A:0034.0006: hidraw0: USB HID v0.00 Device [HID 056a:0034] on usb-dummy_hcd.3-1/input0 usb 4-1: USB disconnect, device number 8