rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P8495/1:b..l
rcu: 	(detected by 0, t=10502 jiffies, g=44025, q=340 ncpus=2)
task:modprobe        state:R  running task     stack:27552 pid:8495  tgid:8495  ppid:2796   flags:0x00000002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5408 [inline]
 __schedule+0xf15/0x5d00 kernel/sched/core.c:6745
 preempt_schedule_irq+0x51/0x90 kernel/sched/core.c:7067
 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:lock_is_held_type+0x107/0x150 kernel/locking/lockdep.c:5830
Code: 00 00 b8 ff ff ff ff 65 0f c1 05 6c 60 1b 75 83 f8 01 75 2d 9c 58 f6 c4 02 75 43 48 f7 04 24 00 02 00 00 74 01 fb 48 83 c4 08 <44> 89 e8 5b 5d 41 5c 41 5d 41 5e 41 5f c3 cc cc cc cc 45 31 ed eb
RSP: 0018:ffffc900032676a8 EFLAGS: 00000282
RAX: 0000000000000046 RBX: ffff88805dc28ae0 RCX: 0000000000000001
RDX: 0000000000000000 RSI: ffffffff8b2cb260 RDI: ffffffff8b8ff400
RBP: ffff888060047398 R08: 0000000000000005 R09: 0000000000000300
R10: 0000000000000300 R11: 0000000000000001 R12: ffff88805dc28000
R13: 0000000000000001 R14: 00000000ffffffff R15: 0000000000000000
 lock_is_held include/linux/lockdep.h:231 [inline]
 mt_locked lib/maple_tree.c:781 [inline]
 mt_slot lib/maple_tree.c:788 [inline]
 mas_slot lib/maple_tree.c:821 [inline]
 mas_get_slot lib/maple_tree.c:7057 [inline]
 mas_validate_gaps lib/maple_tree.c:7321 [inline]
 mt_validate+0x29a0/0x4390 lib/maple_tree.c:7596
 validate_mm+0x9c/0x4b0 mm/mmap.c:288
 do_vmi_align_munmap+0x14b4/0x19c0 mm/mmap.c:2688
 do_vmi_munmap+0x231/0x410 mm/mmap.c:2759
 mmap_region+0x17f/0x2760 mm/mmap.c:2810
 do_mmap+0xbc7/0xf60 mm/mmap.c:1397
 vm_mmap_pgoff+0x1ba/0x360 mm/util.c:573
 ksys_mmap_pgoff+0x332/0x5d0 mm/mmap.c:1443
 __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: 0033:0x7f014464bb74
RSP: 002b:00007ffe9ee6f8e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007ffe9ee6f960 RCX: 00007f014464bb74
RDX: 0000000000000001 RSI: 0000000000028000 RDI: 00007f01445fc000
RBP: 00007ffe9ee6fc50 R08: 0000000000000000 R09: 0000000000097000
R10: 0000000000000812 R11: 0000000000000246 R12: 00007f01446280c0
R13: 00007ffe9ee6fcd8 R14: 0000000000096066 R15: 0000000000000000
 </TASK>
rcu: rcu_preempt kthread starved for 10287 jiffies! g44025 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:26208 pid:17    tgid:17    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5408 [inline]
 __schedule+0xf15/0x5d00 kernel/sched/core.c:6745
 __schedule_loop kernel/sched/core.c:6822 [inline]
 schedule+0xe7/0x350 kernel/sched/core.c:6837
 schedule_timeout+0x136/0x2a0 kernel/time/timer.c:2581
 rcu_gp_fqs_loop+0x1eb/0xb00 kernel/rcu/tree.c:2000
 rcu_gp_kthread+0x271/0x380 kernel/rcu/tree.c:2202
 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:86 [inline]
NMI backtrace for cpu 1 skipped: idling at acpi_safe_halt+0x1a/0x20 drivers/acpi/processor_idle.c:112