rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P5529/1:b..l
rcu: 	(detected by 1, t=10502 jiffies, g=10685, q=836 ncpus=2)
task:modprobe        state:R  running task     stack:25600 pid:5529  tgid:5529  ppid:953    flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5408 [inline]
 __schedule+0x17e8/0x4a20 kernel/sched/core.c:6745
 preempt_schedule_irq+0xfb/0x1c0 kernel/sched/core.c:7067
 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:lock_is_held_type+0x0/0x190 kernel/locking/lockdep.c:5810
Code: f5 90 0f 0b 90 90 90 eb b5 e8 2c fc ff ff 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <f3> 0f 1e fa 55 41 57 41 56 41 55 41 54 53 48 83 ec 10 65 48 8b 04
RSP: 0018:ffffc90009ac74a8 EFLAGS: 00000293
RAX: ffffffff8b7e5b41 RBX: ffff888011238b18 RCX: ffff888025783c00
RDX: 0000000000000000 RSI: 00000000ffffffff RDI: ffff888011238b18
RBP: 0000000000000300 R08: ffffffff8b7e5b15 R09: ffffffff8b7e5a4b
R10: 0000000000000004 R11: ffff888025783c00 R12: ffff8880112389c0
R13: 00007fff597f9fff R14: ffff88802bd14ba0 R15: dffffc0000000000
 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+0x15e/0x250 lib/maple_tree.c:7057
 mt_validate+0x27d2/0x4aa0 lib/maple_tree.c:7596
 validate_mm+0xe7/0x530 mm/mmap.c:288
 vma_link+0x3d0/0x4f0 mm/mmap.c:420
 insert_vm_struct+0x2f7/0x410 mm/mmap.c:3413
 __install_special_mapping+0x1b9/0x350 mm/mmap.c:3653
 map_vdso+0x1de/0x410 arch/x86/entry/vdso/vma.c:257
 load_elf_binary+0x1ba4/0x2620 fs/binfmt_elf.c:1237
 search_binary_handler fs/exec.c:1797 [inline]
 exec_binprm fs/exec.c:1839 [inline]
 bprm_execve+0xafa/0x17c0 fs/exec.c:1891
 kernel_execve+0x8e5/0xa10 fs/exec.c:2058
 call_usermodehelper_exec_async+0x237/0x380 kernel/umh.c:110
 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: rcu_preempt kthread starved for 10199 jiffies! g10685 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:25168 pid:17    tgid:17    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5408 [inline]
 __schedule+0x17e8/0x4a20 kernel/sched/core.c:6745
 __schedule_loop kernel/sched/core.c:6822 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6837
 schedule_timeout+0x1be/0x310 kernel/time/timer.c:2581
 rcu_gp_fqs_loop+0x2df/0x1330 kernel/rcu/tree.c:2000
 rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:2202
 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 1 to CPUs 0:
NMI backtrace for cpu 0 skipped: idling at native_safe_halt arch/x86/include/asm/irqflags.h:48 [inline]
NMI backtrace for cpu 0 skipped: idling at arch_safe_halt arch/x86/include/asm/irqflags.h:86 [inline]
NMI backtrace for cpu 0 skipped: idling at acpi_safe_halt+0x21/0x30 drivers/acpi/processor_idle.c:112