rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P3545/1:b..l
	(detected by 0, t=10502 jiffies, g=6937, q=572)
task:udevd           state:R  running task     stack:23856 pid: 3545 ppid:     1 flags:0x00004002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5027 [inline]
 __schedule+0x12c4/0x45b0 kernel/sched/core.c:6373
 preempt_schedule_irq+0xf7/0x1c0 kernel/sched/core.c:6777
 irqentry_exit+0x53/0x80 kernel/entry/common.c:432
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:rcu_read_unlock include/linux/rcupdate.h:768 [inline]
RIP: 0010:__d_lookup+0x5d2/0x730 fs/dcache.c:2451
Code: 04 38 84 c0 0f 85 3a 01 00 00 ff 03 48 8b 7c 24 10 e8 92 7e 6c 08 e8 dd e6 62 08 89 c3 31 ff 89 c6 e8 c2 1a a4 ff 85 db 74 13 <e8> 49 cb 8e ff 84 c0 74 11 e8 50 17 a4 ff e9 82 00 00 00 e8 46 17
RSP: 0018:ffffc90002e2f578 EFLAGS: 00000202
RAX: 0000000000000000 RBX: 0000000000000001 RCX: ffff88807d161dc0
RDX: ffff88807d161dc0 RSI: 0000000000000001 RDI: 0000000000000000
RBP: 0000000000000007 R08: ffffffff81dc6e2e R09: ffffed100427e871
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff8880213f42f0
R13: ffff888021293d60 R14: 006c617574726976 R15: dffffc0000000000
 lookup_fast+0xdc/0x7b0 fs/namei.c:1621
 walk_component+0x115/0x610 fs/namei.c:1972
 link_path_walk+0x642/0xd90
 path_openat+0x249/0x2f20 fs/namei.c:3738
 do_filp_open+0x21c/0x460 fs/namei.c:3769
 do_sys_openat2+0x13b/0x4f0 fs/open.c:1253
 do_sys_open fs/open.c:1269 [inline]
 __do_sys_openat fs/open.c:1285 [inline]
 __se_sys_openat fs/open.c:1280 [inline]
 __x64_sys_openat+0x243/0x290 fs/open.c:1280
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f138b3d6477
RSP: 002b:00007ffeb501dd38 EFLAGS: 00000287 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000560599ef2170 RCX: 00007f138b3d6477
RDX: 0000000000090800 RSI: 0000560599ee1a40 RDI: 00000000ffffff9c
RBP: 0000560599f9bff0 R08: 0000000000090800 R09: 0000560599ee1a40
R10: 0000000000000000 R11: 0000000000000287 R12: 0000560599ee1a40
R13: 00000000000000ff R14: 000056057879a1c4 R15: 0000000000000000
 </TASK>
rcu: rcu_preempt kthread starved for 9868 jiffies! g6937 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1
rcu: 	Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
task:rcu_preempt     state:R  running task     stack:26816 pid:   15 ppid:     2 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5027 [inline]
 __schedule+0x12c4/0x45b0 kernel/sched/core.c:6373
 schedule+0x11b/0x1f0 kernel/sched/core.c:6456
 schedule_timeout+0x1b9/0x300 kernel/time/timer.c:1914
 rcu_gp_fqs_loop+0x2bf/0x1080 kernel/rcu/tree.c:1972
 rcu_gp_kthread+0xa4/0x360 kernel/rcu/tree.c:2145
 kthread+0x3f6/0x4f0 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1 skipped: idling at native_safe_halt arch/x86/include/asm/irqflags.h:51 [inline]
NMI backtrace for cpu 1 skipped: idling at arch_safe_halt arch/x86/include/asm/irqflags.h:89 [inline]
NMI backtrace for cpu 1 skipped: idling at acpi_safe_halt drivers/acpi/processor_idle.c:108 [inline]
NMI backtrace for cpu 1 skipped: idling at acpi_idle_do_entry+0x10f/0x340 drivers/acpi/processor_idle.c:562