rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P12204/1:b..l
rcu: 	(detected by 0, t=10502 jiffies, g=84477, q=238 ncpus=2)
task:dhcpcd-run-hook state:R  running task     stack:26384 pid:12204 tgid:12204 ppid:4884   flags:0x00000002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5188 [inline]
 __schedule+0xe37/0x5490 kernel/sched/core.c:6529
 preempt_schedule_irq+0x51/0x90 kernel/sched/core.c:6851
 irqentry_exit+0x36/0x90 kernel/entry/common.c:354
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:preempt_count arch/x86/include/asm/preempt.h:26 [inline]
RIP: 0010:check_kcov_mode kernel/kcov.c:182 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0xc/0x70 kernel/kcov.c:216
Code: c3 cc cc cc cc 66 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 65 48 8b 15 54 5b 79 7e <65> 8b 05 55 5b 79 7e a9 00 01 ff 00 48 8b 34 24 74 1d f6 c4 01 74
RSP: 0018:ffffc90003307668 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffffc90003307798 RCX: ffffffff8afeb76a
RDX: ffff888018710000 RSI: ffffffff8afeb77b RDI: ffff88802a4ef0f0
RBP: ffff88802a4ef000 R08: 0000000000000005 R09: 0000000000000003
R10: 0000000000000003 R11: 0000000000000000 R12: 0000000000000003
R13: 0000000000000003 R14: 0000000000000001 R15: 0000000000000001
 ma_dead_node lib/maple_tree.c:559 [inline]
 mas_next_node+0x17e/0xf40 lib/maple_tree.c:4564
 mas_dfs_postorder lib/maple_tree.c:7065 [inline]
 mt_validate+0x21d0/0x4390 lib/maple_tree.c:7594
 validate_mm+0x9c/0x4b0 mm/mmap.c:329
 do_vmi_align_munmap+0x14b4/0x19c0 mm/mmap.c:2759
 do_vmi_munmap+0x231/0x410 mm/mmap.c:2830
 mmap_region+0x17f/0x2760 mm/mmap.c:2881
 do_mmap+0xbfb/0xfb0 mm/mmap.c:1468
 vm_mmap_pgoff+0x1ba/0x360 mm/util.c:588
 ksys_mmap_pgoff+0x332/0x5d0 mm/mmap.c:1514
 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:86 [inline]
 __se_sys_mmap arch/x86/kernel/sys_x86_64.c:79 [inline]
 __x64_sys_mmap+0x125/0x190 arch/x86/kernel/sys_x86_64.c:79
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f87e9105b74
RSP: 002b:00007fff8ede5468 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007fff8ede5518 RCX: 00007f87e9105b74
RDX: 0000000000000003 RSI: 0000000000006000 RDI: 00007f87e900c000
RBP: 00007fff8ede5c00 R08: 0000000000000003 R09: 000000000019d000
R10: 0000000000000812 R11: 0000000000000246 R12: 00007f87e90e25c0
R13: 00007fff8ede5c88 R14: 000000000019d264 R15: 0000000000000000
 </TASK>
rcu: rcu_preempt kthread starved for 10311 jiffies! g84477 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:27680 pid:17    tgid:17    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5188 [inline]
 __schedule+0xe37/0x5490 kernel/sched/core.c:6529
 __schedule_loop kernel/sched/core.c:6606 [inline]
 schedule+0xe7/0x350 kernel/sched/core.c:6621
 schedule_timeout+0x136/0x2a0 kernel/time/timer.c:2581
 rcu_gp_fqs_loop+0x1eb/0xb00 kernel/rcu/tree.c:2034
 rcu_gp_kthread+0x271/0x380 kernel/rcu/tree.c:2236
 kthread+0x2c1/0x3a0 kernel/kthread.c:389
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </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:48 [inline]
NMI backtrace for cpu 1 skipped: idling at arch_safe_halt arch/x86/include/asm/irqflags.h:106 [inline]
NMI backtrace for cpu 1 skipped: idling at acpi_safe_halt+0x1a/0x20 drivers/acpi/processor_idle.c:111