rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P14441/1:b..l
	(detected by 0, t=10502 jiffies, g=78981, q=282 ncpus=2)
task:rm              state:R  running task     stack:24336 pid:14441 ppid:14408  flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5245 [inline]
 __schedule+0x11d1/0x40e0 kernel/sched/core.c:6562
 preempt_schedule_irq+0xbb/0x160 kernel/sched/core.c:6874
 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:__sanitizer_cov_trace_pc+0x0/0x60 kernel/kcov.c:212
Code: 2e 0f 1f 84 00 00 00 00 00 90 53 48 89 fb e8 17 00 00 00 48 8b 3d 70 77 9d 0c 48 89 de 5b e9 b7 42 50 00 00 00 cc cc 00 00 cc <48> 8b 04 24 65 48 8b 0d 84 e8 7f 7e 65 8b 15 85 e8 7f 7e 81 e2 00
RSP: 0018:ffffc9000d20f3d8 EFLAGS: 00000246
RAX: ffffffff8a1b75d5 RBX: 0000000000000000 RCX: ffff88802a511dc0
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc9000d20f590 R08: ffff88802a511dc0 R09: 0000000000000003
R10: 0000000000000003 R11: 0000000000000000 R12: dffffc0000000000
R13: 000000000000000d R14: 0000000000000001 R15: 000000000000000f
 mas_validate_limits lib/maple_tree.c:7158 [inline]
 mt_validate+0x22e3/0x4cb0 lib/maple_tree.c:7244
 validate_mm_mt+0xe2/0x440 mm/mmap.c:295
 validate_mm+0xe1/0x2e0 mm/mmap.c:332
 remove_mt mm/mmap.c:2322 [inline]
 do_mas_align_munmap+0x1000/0x12b0 mm/mmap.c:2595
 do_mas_munmap+0x240/0x2b0 mm/mmap.c:2650
 __mmap_region mm/mmap.c:2698 [inline]
 mmap_region+0x6e0/0x1ca0 mm/mmap.c:2916
 do_mmap+0x964/0xfd0 mm/mmap.c:1436
 vm_mmap_pgoff+0x1c1/0x2d0 mm/util.c:520
 ksys_mmap_pgoff+0x516/0x6f0 mm/mmap.c:1482
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f42a9919242
RSP: 002b:00007ffc5a8da0e8 EFLAGS: 00000206 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007f42a9637000 RCX: 00007f42a9919242
RDX: 0000000000000003 RSI: 0000000000002000 RDI: 00007f42a9637000
RBP: 0000000000000812 R08: 0000000000000003 R09: 000000000000d000
R10: 0000000000000812 R11: 0000000000000206 R12: 00007ffc5a8da1a8
R13: 00007f42a98f6580 R14: 00007ffc5a8da560 R15: 00000fff8b51b420
 </TASK>
rcu: rcu_preempt kthread starved for 8045 jiffies! g78981 f0x0 RCU_GP_DOING_FQS(6) ->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:27184 pid:16    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5245 [inline]
 __schedule+0x11d1/0x40e0 kernel/sched/core.c:6562
 preempt_schedule_irq+0xbb/0x160 kernel/sched/core.c:6874
 irqentry_exit+0x63/0x70 kernel/entry/common.c:439
 asm_sysvec_reschedule_ipi+0x16/0x20 arch/x86/include/asm/idtentry.h:696
RIP: 0010:rcu_gp_fqs_loop+0xf9/0x1340 kernel/rcu/tree.c:1737
Code: 30 20 8e 48 c1 e9 03 48 89 4c 24 28 48 c7 c1 d4 fc 1f 8e 48 c1 e9 03 48 89 4c 24 48 b1 01 89 4c 24 24 31 c9 84 c0 75 32 eb 2a <48> 8b 05 30 2b 13 0b 48 89 05 29 75 45 0b 31 c9 48 8b 1d e0 66 45
RSP: 0018:ffffc90000157cc0 EFLAGS: 00000246
RAX: 1ffffffff1901e40 RBX: ffff88813fef5dc9 RCX: 52bc252691fefe00
RDX: ffff88813fef5940 RSI: dffffc0000000000 RDI: ffffffff8adf1ba0
RBP: ffffc90000157e10 R08: ffffffff8cb33343 R09: 1ffffffff1966668
R10: dffffc0000000000 R11: fffffbfff1966669 R12: 0000000000000000
R13: ffffffff8cb33840 R14: 0000000000000000 R15: 0000000000000000
 rcu_gp_kthread+0x99/0x3b0 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