rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1):
 P10/1:b..l

rcu: 	(detected by 1, t=10502 jiffies, g=154241, q=1302 ncpus=2)
task:kworker/0:1     state:R
  running task     stack:22216 pid:10    tgid:10    ppid:2      task_flags:0x4288060 flags:0x00080000
Workqueue: usb_hub_wq hub_event
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5387 [inline]
 __schedule+0xf89/0x4840 kernel/sched/core.c:7188
 preempt_schedule_irq+0x50/0x90 kernel/sched/core.c:7512
 irqentry_exit_to_kernel_mode_preempt include/linux/irq-entry-common.h:476 [inline]
 irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:547 [inline]
 irqentry_exit+0x1cc/0x6c0 kernel/entry/common.c:164
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:lock_acquire+0x5e/0x370 kernel/locking/lockdep.c:5872
Code: 05 7b 4e 68 0b 83 f8 07 0f 87 d9 02 00 00 48 0f a3 05 06 55 61 09 0f 82 a4 02 00 00 8b 35 8e 64 61 09 85 f6 0f 85 bf 00 00 00 <48> 8b 44 24 30 65 48 2b 05 1d 4e 68 0b 0f 85 ed 02 00 00 48 83 c4
RSP: 0018:ffffc900000af588 EFLAGS: 00000206
RAX: 0000000000000046 RBX: 0000000000000000 RCX: 0000000000000007
RDX: 0000000000000000 RSI: ffffffff890a58f7 RDI: ffffffff87b08d60
RBP: ffffffff896de8e0 R08: 00000000d1941547 R09: 0000000000000007
R10: 0000000000000200 R11: 0000000000000000 R12: 0000000000000002
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
 rcu_read_lock include/linux/rcupdate.h:838 [inline]
 class_rcu_constructor include/linux/rcupdate.h:1181 [inline]
 kernfs_root+0x34/0x2a0 fs/kernfs/kernfs-internal.h:74
 kernfs_next_descendant_post+0x1f5/0x4b0 fs/kernfs/dir.c:1411
 __kernfs_remove+0x193/0xb80 fs/kernfs/dir.c:1561
 kernfs_remove_by_name_ns+0x7c/0x120 fs/kernfs/dir.c:1798
 kernfs_remove_by_name include/linux/kernfs.h:639 [inline]
 remove_files+0x96/0x1c0 fs/sysfs/group.c:28
 sysfs_remove_group+0x8b/0x1b0 fs/sysfs/group.c:328
 sysfs_remove_groups fs/sysfs/group.c:352 [inline]
 sysfs_remove_groups+0x60/0xb0 fs/sysfs/group.c:344
 device_remove_groups drivers/base/core.c:2844 [inline]
 device_remove_attrs+0x192/0x290 drivers/base/core.c:2974
 device_del+0x36e/0x9b0 drivers/base/core.c:3894
 device_unregister+0x1d/0xe0 drivers/base/core.c:3936
 usb_remove_ep_devs+0x42/0x90 drivers/usb/core/endpoint.c:181
 remove_intf_ep_devs drivers/usb/core/message.c:1326 [inline]
 usb_disable_device+0x319/0x810 drivers/usb/core/message.c:1477
 usb_disconnect+0x2e2/0x9a0 drivers/usb/core/hub.c:2345
 hub_port_connect drivers/usb/core/hub.c:5407 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5707 [inline]
 port_event drivers/usb/core/hub.c:5871 [inline]
 hub_event+0x1d0c/0x4af0 drivers/usb/core/hub.c:5953
 process_one_work+0xa0e/0x1980 kernel/workqueue.c:3302
 process_scheduled_works kernel/workqueue.c:3385 [inline]
 worker_thread+0x5ef/0xe50 kernel/workqueue.c:3466
 kthread+0x370/0x450 kernel/kthread.c:436
 ret_from_fork+0x69a/0xc80 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>