rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P11955/1:b..l
rcu: 	(detected by 0, t=10502 jiffies, g=85333, q=582 ncpus=2)
task:rm              state:R  running task     stack:23680 pid:11955 tgid:11955 ppid:11928  flags:0x00000000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5188 [inline]
 __schedule+0x1800/0x4a60 kernel/sched/core.c:6529
 preempt_schedule_irq+0xfb/0x1c0 kernel/sched/core.c:6851
 irqentry_exit+0x5e/0x90 kernel/entry/common.c:354
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:mt_validate_nulls lib/maple_tree.c:7557 [inline]
RIP: 0010:mt_validate+0x4590/0x4aa0 lib/maple_tree.c:7596
Code: c7 c6 20 d0 fe 8f e8 4f 03 e7 f5 83 fb 01 7f 32 85 db 74 4f 83 fb 01 75 41 e8 bc fd e6 f5 eb 56 e8 b5 fd e6 f5 48 8b 44 24 10 <fe> c0 48 89 44 24 10 49 bd 00 00 00 00 00 fc ff df 48 8b 5c 24 20
RSP: 0018:ffffc900036ef480 EFLAGS: 00000293
RAX: 0000000000000007 RBX: 0000000000000007 RCX: ffff88805350da00
RDX: 0000000000000000 RSI: 000000000000000d RDI: 0000000000000007
RBP: ffffc900036ef670 R08: ffffffff8bac8cdf R09: ffffffff8bac8b75
R10: 0000000000000003 R11: ffff88805350da00 R12: 1ffff920006ddeb3
R13: ffff8880593fe600 R14: 000000000000000d R15: 000000000000000d
 validate_mm+0xe7/0x530 mm/mmap.c:329
 do_vmi_align_munmap+0x15dd/0x18c0 mm/mmap.c:2759
 do_vmi_munmap+0x261/0x2f0 mm/mmap.c:2830
 mmap_region+0x72f/0x2090 mm/mmap.c:2881
 do_mmap+0x8f9/0x1010 mm/mmap.c:1468
 vm_mmap_pgoff+0x1dd/0x3d0 mm/util.c:588
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f184414db74
RSP: 002b:00007fff094ab6f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007fff094ab7a8 RCX: 00007f184414db74
RDX: 0000000000000003 RSI: 0000000000001610 RDI: 00007f1843ea3000
RBP: 00007fff094abad0 R08: 00000000ffffffff R09: 0000000000000000
R10: 0000000000000032 R11: 0000000000000246 R12: 00007f1844129fc0
R13: 00007fff094abb58 R14: 00007f1843ea4610 R15: 00007f1843ea3000
 </TASK>
rcu: rcu_preempt kthread starved for 10538 jiffies! g85333 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:25232 pid:17    tgid:17    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5188 [inline]
 __schedule+0x1800/0x4a60 kernel/sched/core.c:6529
 __schedule_loop kernel/sched/core.c:6606 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6621
 schedule_timeout+0x1be/0x310 kernel/time/timer.c:2581
 rcu_gp_fqs_loop+0x2df/0x1330 kernel/rcu/tree.c:2034
 rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:2236
 kthread+0x2f2/0x390 kernel/kthread.c:389
 ret_from_fork+0x4d/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+0x21/0x30 drivers/acpi/processor_idle.c:111