rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P11218/1:b..l
rcu: 	(detected by 0, t=10502 jiffies, g=78041, q=559 ncpus=2)
task:modprobe        state:R  running task     stack:23680 pid:11218 tgid:11218 ppid:136    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:mas_data_end lib/maple_tree.c:1454 [inline]
RIP: 0010:mt_validate_nulls lib/maple_tree.c:7549 [inline]
RIP: 0010:mt_validate+0x447a/0x4aa0 lib/maple_tree.c:7596
Code: 85 81 03 00 00 45 0f b6 3c 24 41 8d 47 ff 0f b6 c8 48 8b 44 24 58 48 89 4c 24 70 48 8d 1c c8 48 89 d8 48 c1 e8 03 80 3c 10 00 <74> 08 48 89 df e8 8c 45 4e f6 4c 8b 23 31 ff 4c 89 e6 e8 3f 03 e7
RSP: 0018:ffffc9000909f700 EFLAGS: 00000246
RAX: 1ffff1100bfd840f RBX: ffff88805fec2078 RCX: 000000000000000e
RDX: dffffc0000000000 RSI: 0000000000000001 RDI: 0000000000000004
RBP: ffffc9000909f8f0 R08: ffffffff8bac8c1d R09: ffffffff8bac8b75
R10: 0000000000000003 R11: ffff8880234d1e00 R12: ffffffff8d33f9c1
R13: ffff88805fec2000 R14: 0000000000000001 R15: 000000000000000f
 validate_mm+0xe7/0x530 mm/mmap.c:329
 mmap_region+0x1a61/0x2090 mm/mmap.c:3071
 do_mmap+0x8f9/0x1010 mm/mmap.c:1468
 vm_mmap_pgoff+0x1dd/0x3d0 mm/util.c:588
 ksys_mmap_pgoff+0x4f1/0x720 mm/mmap.c:1514
 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: 0033:0x7ff548511b74
RSP: 002b:00007ffec7ab4878 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007ffec7ab4928 RCX: 00007ff548511b74
RDX: 0000000000000003 RSI: 0000000000006000 RDI: 00007ff548417000
RBP: 00007ffec7ab5010 R08: 0000000000000000 R09: 000000000019d000
R10: 0000000000000812 R11: 0000000000000246 R12: 00007ff5484ed5c0
R13: 00007ffec7ab5098 R14: 000000000019d264 R15: 0000000000000000
 </TASK>
rcu: rcu_preempt kthread starved for 10536 jiffies! g78041 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:26448 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