rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P3898/1:b..l
	(detected by 0, t=10502 jiffies, g=7109, q=975 ncpus=2)
task:rm              state:R  running task     stack:23880 pid:3898  ppid:3857   flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5241 [inline]
 __schedule+0x143f/0x4570 kernel/sched/core.c:6558
 preempt_schedule_irq+0xf7/0x1c0 kernel/sched/core.c:6870
 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:__kasan_check_write+0x6/0x10 mm/kasan/shadow.c:37
Code: c7 c7 b4 af b7 8c 4c 89 fe e8 c6 38 c2 08 31 db eb d7 cc cc 89 f6 48 8b 0c 24 31 d2 e9 d3 ec ff ff 0f 1f 00 89 f6 48 8b 0c 24 <ba> 01 00 00 00 e9 c0 ec ff ff 55 41 56 53 48 89 d3 41 89 f6 48 89
RSP: 0018:ffffc900050e7838 EFLAGS: 00000293
RAX: ffffffff8a9d6a2a RBX: 0000555f4a43c000 RCX: ffffffff8a9d6a3b
RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffffffff977a0660
RBP: ffffc900050e7a30 R08: ffffffff8a9d6a1c R09: 0000000000000003
R10: ffffffffffffffff R11: dffffc0000000001 R12: ffff88802eb08c06
R13: 1ffff1100edaaac0 R14: 0000000000000000 R15: 00007fa17f56bfff
 instrument_atomic_read_write include/linux/instrumented.h:102 [inline]
 atomic_inc include/linux/atomic/atomic-instrumented.h:190 [inline]
 mas_validate_gaps lib/maple_tree.c:7018 [inline]
 mt_validate+0x3f4b/0x5ad0 lib/maple_tree.c:7240
 validate_mm_mt+0x165/0x670 mm/mmap.c:295
 validate_mm+0x16e/0x380 mm/mmap.c:332
 do_mmap+0xc7/0xf60 mm/mmap.c:1262
 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: 0033:0x7fa17f63db74
RSP: 002b:00007ffec5f31ff8 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00000fffd8be6400 RCX: 00007fa17f63db74
RDX: 0000000000000001 RSI: 000000000000f888 RDI: 0000000000000000
RBP: 00007ffec5f323d0 R08: 0000000000000003 R09: 0000000000000000
R10: 0000000000000802 R11: 0000000000000246 R12: 00007fa17f620ac0
R13: 00007ffec5f32458 R14: fffffffffffff000 R15: 0000000000000000
 </TASK>
rcu: rcu_preempt kthread starved for 10529 jiffies! g7109 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:25720 pid:16    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5241 [inline]
 __schedule+0x143f/0x4570 kernel/sched/core.c:6558
 schedule+0xbf/0x180 kernel/sched/core.c:6634
 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 0 to CPUs 1:
NMI backtrace for cpu 1 skipped: idling at native_safe_halt arch/x86/include/asm/irqflags.h:51 [inline]
NMI backtrace for cpu 1 skipped: idling at arch_safe_halt arch/x86/include/asm/irqflags.h:89 [inline]
NMI backtrace for cpu 1 skipped: idling at acpi_safe_halt drivers/acpi/processor_idle.c:111 [inline]
NMI backtrace for cpu 1 skipped: idling at acpi_idle_do_entry+0x10f/0x340 drivers/acpi/processor_idle.c:567