rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P11526/1:b..l
	(detected by 1, t=10502 jiffies, g=65285, q=458 ncpus=2)
task:modprobe        state:R  running task     stack:24352 pid:11526 ppid:7775   flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5244 [inline]
 __schedule+0x10ec/0x40b0 kernel/sched/core.c:6561
 preempt_schedule_irq+0xb1/0x150 kernel/sched/core.c:6873
 irqentry_exit+0x63/0x70 kernel/entry/common.c:439
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:mas_slot+0x111/0x190 lib/maple_tree.c:847
Code: 7b f7 85 ed 74 07 e8 2e 9f 7b f7 eb 19 e8 c7 d2 64 f7 89 c5 31 ff 89 c6 e8 7c a2 7b f7 85 ed 74 11 e8 13 9f 7b f7 48 89 d8 5b <41> 5c 41 5e 41 5f 5d c3 e8 82 17 12 00 89 c5 31 ff 89 c6 e8 57 a2
RSP: 0018:ffffc90005be7858 EFLAGS: 00000293
RAX: ffff8880566dce58 RBX: ffff88801eb6ee00 RCX: ffff888058e7bb80
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: 0000000000000001 R08: 0000000000000004 R09: 0000000000000003
R10: fffffbfff2e0b08c R11: 1ffffffff2e0b08c R12: dffffc0000000000
R13: ffff88807720db58 R14: ffff88807720db58 R15: ffff88807720da48
 mas_first_entry lib/maple_tree.c:6736 [inline]
 mt_validate+0x4b78/0x4c90 lib/maple_tree.c:7227
 validate_mm_mt+0xcd/0x420 mm/mmap.c:295
 validate_mm+0xcc/0x2b0 mm/mmap.c:332
 do_mmap+0xc7/0xfd0 mm/mmap.c:1270
 vm_mmap_pgoff+0x1b2/0x2b0 mm/util.c:520
 ksys_mmap_pgoff+0x516/0x6f0 mm/mmap.c:1482
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fe3f26ef242
RSP: 002b:00007ffffe980dd8 EFLAGS: 00000206 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007fe3f23c9000 RCX: 00007fe3f26ef242
RDX: 0000000000000001 RSI: 0000000000002000 RDI: 00007fe3f23c9000
RBP: 0000000000000812 R08: 0000000000000000 R09: 0000000000005000
R10: 0000000000000812 R11: 0000000000000206 R12: 00007ffffe980e60
R13: 00007fe3f23ce0c0 R14: 00007ffffe981210 R15: 00000fffffd301be
 </TASK>
rcu: rcu_preempt kthread starved for 9326 jiffies! g65285 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:27040 pid:16    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5244 [inline]
 __schedule+0x10ec/0x40b0 kernel/sched/core.c:6561
 schedule+0xb9/0x180 kernel/sched/core.c:6637
 schedule_timeout+0x15c/0x280 kernel/time/timer.c:1965
 rcu_gp_fqs_loop+0x2f2/0x1310 kernel/rcu/tree.c:1706
 rcu_gp_kthread+0x95/0x380 kernel/rcu/tree.c:1905
 kthread+0x29d/0x330 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 default_idle+0xb/0x10 arch/x86/kernel/process.c:741