rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P14956/1:b..l
	(detected by 1, t=10502 jiffies, g=83353, q=291 ncpus=2)
task:modprobe        state:R  running task     stack:23880 pid:14956 ppid:3676   flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5244 [inline]
 __schedule+0x143f/0x4570 kernel/sched/core.c:6561
 preempt_schedule_irq+0xf7/0x1c0 kernel/sched/core.c:6873
 irqentry_exit+0x53/0x80 kernel/entry/common.c:439
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:653
RIP: 0010:mas_validate_parent_slot lib/maple_tree.c:7048 [inline]
RIP: 0010:mt_validate+0x143c/0x5ad0 lib/maple_tree.c:7236
Code: 6c 08 f7 eb 1d e8 94 f0 ef f6 89 c3 31 ff 89 c6 e8 b9 6f 08 f7 85 db 0f 84 e0 00 00 00 e8 4c 6c 08 f7 4c 89 f7 48 8b 74 24 20 <e8> 1f 6e 08 f7 48 b8 00 00 00 00 00 fc ff df 48 8b 4c 24 10 80 3c
RSP: 0018:ffffc90003b7f340 EFLAGS: 00000293
RAX: ffffffff8a822e15 RBX: 0000000000000001 RCX: ffff88807e5e5940
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000009
RBP: ffffc90003b7f530 R08: ffffffff8a822e0c R09: 0000000000000003
R10: ffffffffffffffff R11: dffffc0000000001 R12: ffff888021caae98
R13: 0000000000000000 R14: 0000000000000009 R15: ffffc90003b7f498
 validate_mm_mt+0x165/0x670 mm/mmap.c:295
 validate_mm+0x16e/0x380 mm/mmap.c:332
 remove_mt mm/mmap.c:2311 [inline]
 do_mas_align_munmap+0x131d/0x15f0 mm/mmap.c:2585
 do_mas_munmap+0x246/0x2b0 mm/mmap.c:2640
 mmap_region+0x8e6/0x1fa0 mm/mmap.c:2688
 do_mmap+0x8c5/0xf60 mm/mmap.c:1425
 vm_mmap_pgoff+0x1ca/0x2d0 mm/util.c:520
 ksys_mmap_pgoff+0x4f5/0x6d0 mm/mmap.c:1471
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f5b6db8fb74
RSP: 002b:00007ffc3092c728 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007ffc3092c7d8 RCX: 00007f5b6db8fb74
RDX: 0000000000000003 RSI: 0000000000002000 RDI: 00007f5b6d8fa000
RBP: 00007ffc3092cb00 R08: 0000000000000000 R09: 000000000000b000
R10: 0000000000000812 R11: 0000000000000246 R12: 00007f5b6db72ac0
R13: 00007ffc3092cb88 R14: 000000000000b278 R15: 0000000000000000
 </TASK>
rcu: rcu_preempt kthread starved for 10242 jiffies! g83353 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0
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:27064 pid:16    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5244 [inline]
 __schedule+0x143f/0x4570 kernel/sched/core.c:6561
 schedule+0xbf/0x180 kernel/sched/core.c:6637
 schedule_timeout+0x1b9/0x300 kernel/time/timer.c:1965
 rcu_gp_fqs_loop+0x2d2/0x1150 kernel/rcu/tree.c:1706
 rcu_gp_kthread+0xa3/0x3b0 kernel/rcu/tree.c:1905
 kthread+0x28d/0x320 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0 skipped: idling at native_safe_halt arch/x86/include/asm/irqflags.h:51 [inline]
NMI backtrace for cpu 0 skipped: idling at arch_safe_halt arch/x86/include/asm/irqflags.h:89 [inline]
NMI backtrace for cpu 0 skipped: idling at acpi_safe_halt drivers/acpi/processor_idle.c:111 [inline]
NMI backtrace for cpu 0 skipped: idling at acpi_idle_do_entry+0x10f/0x340 drivers/acpi/processor_idle.c:567