rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P4413/1:b..l P4440/1:b..l
	(detected by 1, t=10502 jiffies, g=9529, q=106 ncpus=2)
task:udevd           state:R  running task     stack:25696 pid:4440  ppid:3636   flags:0x00004002
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_next_node+0x703/0xb70 lib/maple_tree.c:4698
Code: 63 f7 d0 f7 48 8b 44 24 50 48 89 03 48 8b 44 24 48 42 80 3c 30 00 48 8b 5c 24 30 74 08 48 89 df e8 42 f7 d0 f7 48 8b 44 24 08 <48> 89 03 31 c0 48 83 c4 60 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 f4
RSP: 0018:ffffc900048e7648 EFLAGS: 00000246
RAX: 00007ff28e98efff RBX: ffffc900048e7828 RCX: ffff88801d791dc0
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: 0000000000000001 R08: ffff88801d791dc0 R09: 0000000000000003
R10: 0000000000000003 R11: 0000000000000000 R12: ffff888076c5120c
R13: ffff88807815ae58 R14: dffffc0000000000 R15: ffff88801de84800
 mas_dfs_postorder lib/maple_tree.c:6763 [inline]
 mt_validate+0x384f/0x4c90 lib/maple_tree.c:7247
 validate_mm_mt+0xcd/0x420 mm/mmap.c:295
 validate_mm+0xcc/0x2b0 mm/mmap.c:332
 mmap_region+0x780/0x1c70 mm/mmap.c:2922
 do_mmap+0x958/0xfd0 mm/mmap.c:1436
 vm_mmap_pgoff+0x1b2/0x2b0 mm/util.c:520
 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: 0033:0x7ff28e11d822
RSP: 002b:00007ffe1101aac8 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007ff28e11d822
RDX: 0000000000000003 RSI: 0000000000000200 RDI: 0000000000000000
RBP: 0000000000000022 R08: 00000000ffffffff R09: 0000000000000000
R10: 0000000000000022 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000040000 R14: 0000559c005910b0 R15: 0000000000020000
 </TASK>
task:syz.4.5         state:R  running task     stack:26240 pid:4413  ppid:4275   flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5244 [inline]
 __schedule+0x10ec/0x40b0 kernel/sched/core.c:6561
 preempt_schedule_common+0x82/0xd0 kernel/sched/core.c:6730
 preempt_schedule+0xa7/0xb0 kernel/sched/core.c:6754
 preempt_schedule_thunk+0x16/0x18 arch/x86/entry/thunk_64.S:34
 __raw_spin_unlock include/linux/spinlock_api_smp.h:143 [inline]
 _raw_spin_unlock+0x36/0x40 kernel/locking/spinlock.c:186
 spin_unlock include/linux/spinlock.h:391 [inline]
 filemap_map_pages+0xedb/0x11a0 mm/filemap.c:3531
 do_fault_around mm/memory.c:4600 [inline]
 do_read_fault mm/memory.c:4626 [inline]
 do_fault mm/memory.c:4760 [inline]
 handle_pte_fault mm/memory.c:5031 [inline]
 __handle_mm_fault mm/memory.c:5173 [inline]
 handle_mm_fault+0x287e/0x3e60 mm/memory.c:5294
 do_user_addr_fault+0x51f/0xb10 arch/x86/mm/fault.c:1340
 handle_page_fault arch/x86/mm/fault.c:1431 [inline]
 exc_page_fault+0x60/0x100 arch/x86/mm/fault.c:1487
 asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:608
RIP: 0033:0x7f4b6dc6f2ed
RSP: 002b:00007ffdbe322a00 EFLAGS: 00010202
RAX: 000000110c248000 RBX: 00007f4b6eb15720 RCX: 0000000000000007
RDX: 0000000000001b7a RSI: 000000000000266d RDI: 0000000000000080
RBP: ffffffff81d99b7a R08: 00007f4b6dfe6038 R09: 00007f4b6dfd2000
R10: 00007f4b6d7ff008 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: ffffffff81d99e22 R15: 0000000000000016
 </TASK>
rcu: rcu_preempt kthread starved for 10553 jiffies! g9529 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:27840 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
 preempt_schedule_irq+0xb1/0x150 kernel/sched/core.c:6873
 irqentry_exit+0x63/0x70 kernel/entry/common.c:439
 asm_sysvec_reschedule_ipi+0x16/0x20 arch/x86/include/asm/idtentry.h:696
RIP: 0010:__free_object+0x90b/0x9d0 lib/debugobjects.c:416
Code: fd 48 c7 84 24 a0 00 00 00 00 00 00 00 9c 8f 84 24 a0 00 00 00 f6 84 24 a1 00 00 00 02 75 55 f7 44 24 18 00 02 00 00 74 01 fb <48> c7 44 24 60 0e 36 e0 45 48 8b 44 24 38 4a c7 04 28 00 00 00 00
RSP: 0018:ffffc90000157980 EFLAGS: 00000206
RAX: f4ce1f49c3cdf000 RBX: ffff8880b8e37668 RCX: f4ce1f49c3cdf000
RDX: dffffc0000000000 RSI: ffffffff8a6c0600 RDI: ffffffff8abef920
RBP: ffffc90000157b60 R08: dffffc0000000000 R09: ffffc90000157a60
R10: fffff5200002af5c R11: 1ffff9200002af4c R12: ffff8880b8e37670
R13: dffffc0000000000 R14: 1ffff110171c6ecd R15: ffff888078a5c548
 free_object lib/debugobjects.c:424 [inline]
 debug_object_free+0x2a2/0x3e0 lib/debugobjects.c:856
 destroy_timer_on_stack kernel/time/timer.c:812 [inline]
 schedule_timeout+0x175/0x280 kernel/time/timer.c:2172
 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
sched: RT throttling activated