rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P12736/1:b..l P18388/1:b..l
rcu: 	(detected by 1, t=10502 jiffies, g=126141, q=513 ncpus=2)
task:syz.0.3514      state:R  running task     stack:25968 pid:18388 tgid:18387 ppid:16136  flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5407 [inline]
 __schedule+0xf27/0x5d10 kernel/sched/core.c:6748
 preempt_schedule_irq+0x51/0x90 kernel/sched/core.c:7070
 irqentry_exit+0x36/0x90 kernel/entry/common.c:354
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:debug_lockdep_rcu_enabled+0x4/0x40 kernel/rcu/update.c:320
Code: b6 e8 40 fa ff ff eb b6 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa <8b> 05 6a 00 fd 04 85 c0 74 20 8b 05 64 32 fd 04 85 c0 74 16 65 48
RSP: 0018:ffffc90003387ac8 EFLAGS: 00000246
RAX: 1ffff1100f3c1271 RBX: ffff888079e09340 RCX: ffffc9000dbfa000
RDX: 0000000000040000 RSI: ffffffff8ad42b51 RDI: ffff888079e09388
RBP: ffff8880291cec1e R08: 0000000000000005 R09: 0000000000000001
R10: 0000000000000001 R11: 0000000000000001 R12: dffffc0000000000
R13: 0000000000000001 R14: 0000000000000000 R15: dffffc0000000000
 mas_root lib/maple_tree.c:832 [inline]
 mas_start lib/maple_tree.c:1362 [inline]
 mtree_load+0x19d/0xa30 lib/maple_tree.c:6325
 vma_lookup include/linux/mm.h:3537 [inline]
 do_pages_stat_array mm/migrate.c:2344 [inline]
 do_pages_stat+0x47c/0x8e0 mm/migrate.c:2415
 kernel_move_pages+0x1064/0x19b0 mm/migrate.c:2502
 __do_sys_move_pages mm/migrate.c:2513 [inline]
 __se_sys_move_pages mm/migrate.c:2508 [inline]
 __x64_sys_move_pages+0xe0/0x1c0 mm/migrate.c:2508
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f206d175bd9
RSP: 002b:00007f206df31048 EFLAGS: 00000246 ORIG_RAX: 0000000000000117
RAX: ffffffffffffffda RBX: 00007f206d303f60 RCX: 00007f206d175bd9
RDX: 0000000020000040 RSI: 1ffffffffffffd15 RDI: 0000000000000000
RBP: 00007f206d1e4e60 R08: 0000000020000040 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f206d303f60 R15: 00007ffd21a4bd68
 </TASK>
task:syz-executor    state:R  running task     stack:24544 pid:12736 tgid:12736 ppid:12713  flags:0x00000000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5407 [inline]
 __schedule+0xf27/0x5d10 kernel/sched/core.c:6748
 preempt_schedule_common+0x44/0xc0 kernel/sched/core.c:6927
 preempt_schedule_thunk+0x1a/0x30 arch/x86/entry/thunk.S:12
 __raw_spin_unlock include/linux/spinlock_api_smp.h:143 [inline]
 _raw_spin_unlock+0x3e/0x50 kernel/locking/spinlock.c:186
 spin_unlock include/linux/spinlock.h:391 [inline]
 do_wp_page+0x1852/0x3290 mm/memory.c:3672
 handle_pte_fault mm/memory.c:5397 [inline]
 __handle_mm_fault+0x2311/0x53d0 mm/memory.c:5524
 handle_mm_fault+0x476/0xa00 mm/memory.c:5689
 do_user_addr_fault+0x60d/0x13f0 arch/x86/mm/fault.c:1338
 handle_page_fault arch/x86/mm/fault.c:1481 [inline]
 exc_page_fault+0x5c/0xc0 arch/x86/mm/fault.c:1539
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0033:0x7f353172b639
RSP: 002b:00007ffc42fdf0d8 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f353176c4d3
RDX: 0000000000000492 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
R10: 0000555590c767d0 R11: 0000000000000246 R12: 0000000000000492
R13: ffffffffffffffa8 R14: 0000000000000006 R15: 0000000000000000
 </TASK>
rcu: rcu_preempt kthread starved for 10552 jiffies! g126141 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:27680 pid:17    tgid:17    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5407 [inline]
 __schedule+0xf27/0x5d10 kernel/sched/core.c:6748
 __schedule_loop kernel/sched/core.c:6825 [inline]
 schedule+0xe7/0x350 kernel/sched/core.c:6840
 schedule_timeout+0x136/0x2a0 kernel/time/timer.c:2581
 rcu_gp_fqs_loop+0x1eb/0xb00 kernel/rcu/tree.c:2034
 rcu_gp_kthread+0x271/0x380 kernel/rcu/tree.c:2236
 kthread+0x2c1/0x3a0 kernel/kthread.c:389
 ret_from_fork+0x45/0x80 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+0x1a/0x20 drivers/acpi/processor_idle.c:111