rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P6638/1:b..l
rcu: 	(detected by 0, t=10502 jiffies, g=12093, q=250902 ncpus=2)
task:udevd           state:R  running task     stack:0     pid:6638  tgid:6638  ppid:6105   task_flags:0x400140 flags:0x00000008
Call trace:
 __switch_to+0x404/0x778 arch/arm64/kernel/process.c:701 (T)
 context_switch kernel/sched/core.c:5382 [inline]
 __schedule+0x13b0/0x28d4 kernel/sched/core.c:6767
 preempt_schedule_irq+0x80/0x188 kernel/sched/core.c:7090
 arm64_preempt_schedule_irq+0x44/0x58 arch/arm64/kernel/entry-common.c:301
 __el1_irq arch/arm64/kernel/entry-common.c:563 [inline]
 el1_interrupt+0x3c/0x54 arch/arm64/kernel/entry-common.c:575
 el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:580
 el1h_64_irq+0x6c/0x70 arch/arm64/kernel/entry.S:596
 __daif_local_irq_restore arch/arm64/include/asm/irqflags.h:175 [inline] (P)
 arch_local_irq_restore arch/arm64/include/asm/irqflags.h:195 [inline] (P)
 lock_acquire+0x178/0x2e0 kernel/locking/lockdep.c:5869 (P)
 rcu_lock_acquire+0x40/0x4c include/linux/rcupdate.h:331
 rcu_read_lock include/linux/rcupdate.h:841 [inline]
 lookup_mnt+0x30/0x46c fs/namespace.c:875
 __traverse_mounts+0x170/0x4cc fs/namei.c:1482
 traverse_mounts fs/namei.c:1529 [inline]
 handle_mounts fs/namei.c:1632 [inline]
 step_into+0x1d4/0xafc fs/namei.c:1976
 walk_component fs/namei.c:2144 [inline]
 link_path_walk+0x60c/0xc60 fs/namei.c:2503
 path_openat+0x1cc/0x2c40 fs/namei.c:4035
 do_filp_open+0x18c/0x36c fs/namei.c:4066
 do_sys_openat2+0x11c/0x1b4 fs/open.c:1429
 do_sys_open fs/open.c:1444 [inline]
 __do_sys_openat fs/open.c:1460 [inline]
 __se_sys_openat fs/open.c:1455 [inline]
 __arm64_sys_openat+0x120/0x158 fs/open.c:1455
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49
 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
 el0_svc+0x58/0x150 arch/arm64/kernel/entry-common.c:744
 el0t_64_sync_handler+0x78/0x108 arch/arm64/kernel/entry-common.c:762
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600