rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P6528/1:b..l
rcu: 	(detected by 0, t=10502 jiffies, g=15317, q=406 ncpus=2)
task:modprobe        state:R  running task     stack:22608 pid:6528  tgid:6528  ppid:63     flags:0x00000002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5188 [inline]
 __schedule+0x17ae/0x4a10 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_validate_limits lib/maple_tree.c:7483 [inline]
RIP: 0010:mt_validate+0xf3d/0x4aa0 lib/maple_tree.c:7590
Code: e8 88 84 ef f5 49 bd 00 00 00 00 00 fc ff df 48 8b bc 24 80 00 00 00 49 89 fe 49 c1 ee 03 43 80 3c 2e 00 74 05 e8 43 a1 53 f6 <48> 8b 9c 24 60 01 00 00 4c 89 ff 48 89 de e8 b0 86 ef f5 49 39 df
RSP: 0018:ffffc900031b76a0 EFLAGS: 00000246
RAX: ffffffff8ba40718 RBX: 0000000000000008 RCX: ffff88802c2c8000
RDX: 0000000000000000 RSI: 00007fb99a64cfff RDI: ffffc900031b7800
RBP: ffffc900031b7890 R08: ffffffff8ba4070a R09: ffffffff8ba40552
R10: 0000000000000004 R11: ffff88802c2c8000 R12: 0000000000000001
R13: dffffc0000000000 R14: 1ffff92000636f00 R15: 00007fb99a64cfff
 validate_mm+0xe7/0x530 mm/mmap.c:329
 __split_vma+0xaca/0xc30 mm/mmap.c:2511
 split_vma mm/mmap.c:2537 [inline]
 vma_modify+0x268/0x350 mm/mmap.c:2578
 vma_modify_flags include/linux/mm.h:3309 [inline]
 mprotect_fixup+0x3ea/0xa90 mm/mprotect.c:639
 do_mprotect_pkey+0x908/0xe00 mm/mprotect.c:822
 __do_sys_mprotect mm/mprotect.c:843 [inline]
 __se_sys_mprotect mm/mprotect.c:840 [inline]
 __x64_sys_mprotect+0x80/0x90 mm/mprotect.c:840
 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: 0033:0x7fb99a666bb7
RSP: 002b:00007fff04167558 EFLAGS: 00000206 ORIG_RAX: 000000000000000a
RAX: ffffffffffffffda RBX: 00007fb99a67aab0 RCX: 00007fb99a666bb7
RDX: 0000000000000001 RSI: 0000000000002000 RDI: 00007fb99a678000
RBP: 00007fff04167670 R08: 00007fff04160000 R09: 00007fb99a6425c0
R10: 00007fb99a64b858 R11: 0000000000000206 R12: 00007fb99a67aab0
R13: 00007fb99a66eeda R14: 00007fb99a6799f0 R15: 00007fb99a679f40
 </TASK>
rcu: rcu_preempt kthread starved for 10532 jiffies! g15317 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:24912 pid:17    tgid:17    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5188 [inline]
 __schedule+0x17ae/0x4a10 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+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/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