rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P13697/1:b..l
	(detected by 0, t=10502 jiffies, g=77105, q=43 ncpus=2)
task:rm              state:R  running task     stack:24064 pid:13697 ppid:13642  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_validate_gaps lib/maple_tree.c:6972 [inline]
RIP: 0010:mt_validate+0x2a5c/0x4c90 lib/maple_tree.c:7244
Code: 00 00 00 00 fc ff df 41 83 fe 03 48 89 5c 24 30 0f 87 e3 08 00 00 4c 89 e8 48 c1 e8 03 42 0f b6 04 20 84 c0 0f 85 33 09 00 00 <41> 0f b6 5d 00 4c 89 ff 48 89 de e8 34 cf 7b f7 49 39 df 0f 83 d2
RSP: 0018:ffffc900034073c0 EFLAGS: 00000293
RAX: 0000000000000004 RBX: 0000000000000000 RCX: 000000008bb15701
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90003407590 R08: ffff888079c15940 R09: 0000000000000004
R10: 0000000000000003 R11: 0000000000000000 R12: dffffc0000000000
R13: ffffffff8bb15761 R14: 0000000000000001 R15: 0000000000000005
 validate_mm_mt+0xcd/0x420 mm/mmap.c:295
 validate_mm+0xcc/0x2b0 mm/mmap.c:332
 do_mas_align_munmap+0xfad/0x1220 mm/mmap.c:2599
 do_mas_munmap+0x240/0x2b0 mm/mmap.c:2650
 __mmap_region mm/mmap.c:2698 [inline]
 mmap_region+0x6e5/0x1c70 mm/mmap.c:2916
 do_mmap+0x958/0xfd0 mm/mmap.c:1436
 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: 0033:0x7fa3fcb94242
RSP: 002b:00007ffdeaa544a8 EFLAGS: 00000206 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007fa3fc8ba000 RCX: 00007fa3fcb94242
RDX: 0000000000000001 RSI: 0000000000001000 RDI: 00007fa3fc8ba000
RBP: 0000000000000812 R08: 0000000000000003 R09: 0000000000004000
R10: 0000000000000812 R11: 0000000000000206 R12: 00007ffdeaa54530
R13: 00007fa3fcb71050 R14: 00007ffdeaa548e0 R15: 00000fffbd54a898
 </TASK>
rcu: rcu_preempt kthread starved for 10547 jiffies! g77105 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:27200 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 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 default_idle+0xb/0x10 arch/x86/kernel/process.c:741