rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P3562/1:b..l
	(detected by 0, t=10502 jiffies, g=24865, q=191)
task:udevd           state:R  running task     stack:23120 pid: 3562 ppid:     1 flags:0x00004002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5049 [inline]
 __schedule+0x11ef/0x43c0 kernel/sched/core.c:6395
 preempt_schedule_irq+0xbb/0x160 kernel/sched/core.c:6799
 irqentry_exit+0x63/0x70 kernel/entry/common.c:432
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:fast_dput+0x28/0x280 fs/dcache.c:753
Code: 40 00 55 41 57 41 56 41 55 41 54 53 48 89 fb 49 bc 00 00 00 00 00 fc ff df e8 64 d2 aa ff 49 89 df 49 c1 ef 03 43 0f b6 04 27 <84> c0 0f 85 8a 01 00 00 8b 2b 89 ee 83 e6 08 31 ff e8 a2 d5 aa ff
RSP: 0018:ffffc90002daf770 EFLAGS: 00000a02
RAX: 0000000000000000 RBX: ffff88801d752d38 RCX: ffff88807d753b80
RDX: 0000000000000000 RSI: ffffffff8a79f960 RDI: ffff88801d752d38
RBP: 0000000000000001 R08: dffffc0000000000 R09: 1ffffffff203a818
R10: dffffc0000000000 R11: fffffbfff203a819 R12: dffffc0000000000
R13: 1ffff920005b5f63 R14: 0000000000000000 R15: 1ffff11003aea5a7
 dput+0xb7/0x1a0 fs/dcache.c:880
 step_into+0x325/0xd10 fs/namei.c:1823
 link_path_walk+0x665/0xd70 fs/namei.c:-1
 path_lookupat+0x9d/0x440 fs/namei.c:2462
 filename_lookup+0x214/0x540 fs/namei.c:2492
 user_path_at_empty+0x40/0x190 fs/namei.c:2891
 user_path_at include/linux/namei.h:57 [inline]
 vfs_statx+0x107/0x500 fs/stat.c:221
 vfs_fstatat fs/stat.c:243 [inline]
 __do_sys_newfstatat fs/stat.c:411 [inline]
 __se_sys_newfstatat fs/stat.c:405 [inline]
 __x64_sys_newfstatat+0x15f/0x200 fs/stat.c:405
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fde20fc3b0a
RSP: 002b:00007ffe0ec5e5e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000106
RAX: ffffffffffffffda RBX: 00007ffe0ec5ea80 RCX: 00007fde20fc3b0a
RDX: 00007ffe0ec5e5f0 RSI: 00007ffe0ec5ea80 RDI: 00000000ffffff9c
RBP: 0000559b309a0910 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffe0ec5e680
R13: 0000559afe152100 R14: 0000559b309b56e0 R15: 00007ffe0ec5f0a0
 </TASK>
rcu: rcu_preempt kthread starved for 9857 jiffies! g24865 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:27416 pid:   15 ppid:     2 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5049 [inline]
 __schedule+0x11ef/0x43c0 kernel/sched/core.c:6395
 schedule+0x11b/0x1e0 kernel/sched/core.c:6478
 schedule_timeout+0x184/0x2d0 kernel/time/timer.c:2117
 rcu_gp_fqs_loop+0x2be/0x11d0 kernel/rcu/tree.c:1972
 rcu_gp_kthread+0x9b/0x370 kernel/rcu/tree.c:2145
 kthread+0x436/0x520 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 default_idle+0xb/0x10 arch/x86/kernel/process.c:729