rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P4299/1:b..l
rcu: 	(detected by 0, t=10502 jiffies, g=136481, q=868749 ncpus=1)
task:kworker/u8:9    state:R  running task     stack:22568 pid:4299  tgid:4299  ppid:2      task_flags:0x4208160 flags:0x00080000
Workqueue: events_unbound call_usermodehelper_exec_work
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5527 [inline]
 __schedule+0x17dd/0x5940 kernel/sched/core.c:7295
 preempt_schedule_irq+0x4b/0x90 kernel/sched/core.c:7575
 irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:524 [inline]
 irqentry_exit+0x14f/0x910 kernel/entry/common.c:154
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:debug_lockdep_rcu_enabled+0x2c/0x40 kernel/rcu/update.c:320
Code: 1e fa 31 c0 83 3d fb 59 a5 04 00 74 1d 83 3d da 87 a5 04 00 74 14 65 48 8b 0d 48 f5 c5 07 31 c0 83 b9 a4 0b 00 00 00 0f 94 c0 <e9> 8f 06 03 00 cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc 90 90
RSP: 0018:ffffc9000f17f018 EFLAGS: 00000246
RAX: 0000000000000001 RBX: ffffffff81904de7 RCX: ffff888034a23e80
RDX: 0000000050067866 RSI: ffffffff8e82b24f RDI: ffffffff8c6f0580
RBP: 1ffff92001e2fe20 R08: ffffffff817821df R09: 0000000000000000
R10: ffffc9000f17f118 R11: ffffffff81b2b760 R12: dffffc0000000000
R13: ffffffff817821df R14: ffffc9000f17f0c8 R15: 1ffff92001e2fe19
 rcu_read_lock include/linux/rcupdate.h:850 [inline]
 class_rcu_constructor include/linux/rcupdate.h:1216 [inline]
 unwind_next_frame+0xb5/0x2550 arch/x86/kernel/unwind_orc.c:495
 arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122
 save_stack+0x122/0x230 mm/page_owner.c:183
 __reset_page_owner+0x71/0x1f0 mm/page_owner.c:338
 reset_page_owner include/linux/page_owner.h:26 [inline]
 __free_pages_prepare mm/page_alloc.c:1400 [inline]
 __free_frozen_pages+0xc93/0xd90 mm/page_alloc.c:2944
 __slab_free+0x274/0x2c0 mm/slub.c:5820
 qlink_free mm/kasan/quarantine.c:163 [inline]
 qlist_free_all+0x99/0x100 mm/kasan/quarantine.c:179
 kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286
 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:350
 kasan_slab_alloc include/linux/kasan.h:253 [inline]
 slab_post_alloc_hook mm/slub.c:4683 [inline]
 slab_alloc_node mm/slub.c:4996 [inline]
 kmem_cache_alloc_noprof+0x2b4/0x600 mm/slub.c:5010
 copy_signal+0x50/0x650 kernel/fork.c:1745
 copy_process+0x1e25/0x43e0 kernel/fork.c:2303
 kernel_clone+0x2d7/0x940 kernel/fork.c:2765
 user_mode_thread+0x115/0x180 kernel/fork.c:2842
 call_usermodehelper_exec_sync kernel/umh.c:130 [inline]
 call_usermodehelper_exec_work+0x9c/0x230 kernel/umh.c:161
 process_one_work kernel/workqueue.c:3399 [inline]
 process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3482
 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3563
 kthread+0x38b/0x480 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>