rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...0: (1 GPs behind) idle=29b/1/0x4000000000000002 softirq=23348/23354 fqs=2100 
	(detected by 1, t=10505 jiffies, g=26793, q=1096)
Task dump for CPU 0:
task:udevd           state:R  running task     stack:    0 pid: 3643 ppid:     1 flags:0x00000002
Call trace:
 __switch_to+0x308/0x588 arch/arm64/kernel/process.c:518
 return_address+0x118/0x1ec arch/arm64/kernel/return_address.c:46
 rcu_dynticks_curr_cpu_in_eqs kernel/rcu/tree.c:331 [inline]
 rcu_is_watching+0x5c/0x18c kernel/rcu/tree.c:1123
 trace_irq_disable include/trace/events/preemptirq.h:36 [inline]
 trace_hardirqs_off_finish+0x320/0x71c kernel/trace/trace_preemptirq.c:67
 __enter_from_kernel_mode arch/arm64/kernel/entry-common.c:51 [inline]
 enter_from_kernel_mode+0x98/0x17c arch/arm64/kernel/entry-common.c:56
 el1_interrupt+0x30/0x58 arch/arm64/kernel/entry-common.c:454
 el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:470
 el1h_64_irq+0x78/0x7c arch/arm64/kernel/entry.S:522
 arch_local_irq_restore+0x8/0x10 arch/arm64/include/asm/irqflags.h:122
 lock_is_held include/linux/lockdep.h:287 [inline]
 ___might_sleep+0x48/0x4dc kernel/sched/core.c:9605
 __might_sleep+0x98/0xf0 kernel/sched/core.c:9593
 __might_fault+0x80/0x128 mm/memory.c:5354
 filldir64+0x49c/0x9e4 fs/readdir.c:337
 dir_emit include/linux/fs.h:3713 [inline]
 kernfs_fop_readdir+0x4c4/0x770 fs/kernfs/dir.c:1743
 iterate_dir+0x1f4/0x4ec fs/readdir.c:-1
 __do_sys_getdents64 fs/readdir.c:369 [inline]
 __se_sys_getdents64 fs/readdir.c:354 [inline]
 __arm64_sys_getdents64+0x1c4/0x4c4 fs/readdir.c:354
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
 el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:608
 el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584