rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P8403/2:b..l
rcu: 	(detected by 0, t=10502 jiffies, g=11641, q=783 ncpus=2)
task:udevadm         state:R  running task     stack:0     pid:8403  tgid:8403  ppid:7287   task_flags:0x400000 flags:0x00000004
Call trace:
 __switch_to+0x414/0x788 arch/arm64/kernel/process.c:701 (T)
 context_switch kernel/sched/core.c:5378 [inline]
 __schedule+0x1360/0x257c kernel/sched/core.c:6765
 preempt_schedule_irq+0x80/0x188 kernel/sched/core.c:7087
 arm64_preempt_schedule_irq arch/arm64/kernel/entry-common.c:301 [inline]
 __el1_irq arch/arm64/kernel/entry-common.c:563 [inline]
 el1_interrupt+0x4c/0x68 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
 prepend_name fs/d_path.c:98 [inline] (P)
 __prepend_path fs/d_path.c:133 [inline] (P)
 prepend_path+0x360/0xa08 fs/d_path.c:172 (P)
 d_absolute_path+0x13c/0x27c fs/d_path.c:234
 tomoyo_get_absolute_path security/tomoyo/realpath.c:101 [inline]
 tomoyo_realpath_from_path+0x24c/0x4cc security/tomoyo/realpath.c:271
 tomoyo_get_realpath security/tomoyo/file.c:151 [inline]
 tomoyo_check_open_permission+0x1ec/0x414 security/tomoyo/file.c:771
 tomoyo_file_open+0x15c/0x1ec security/tomoyo/tomoyo.c:334
 security_file_open+0xc8/0x298 security/security.c:3114
 do_dentry_open+0x2b8/0x1538 fs/open.c:933
 vfs_open+0x48/0x2d8 fs/open.c:1086
 do_open fs/namei.c:3830 [inline]
 path_openat+0x2308/0x2b1c fs/namei.c:3989
 do_filp_open+0x1e8/0x404 fs/namei.c:4016
 do_sys_openat2+0x124/0x1b8 fs/open.c:1428
 do_sys_open fs/open.c:1443 [inline]
 __do_sys_openat fs/open.c:1459 [inline]
 __se_sys_openat fs/open.c:1454 [inline]
 __arm64_sys_openat+0x1f0/0x240 fs/open.c:1454
 __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+0x54/0x168 arch/arm64/kernel/entry-common.c:744
 el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600