rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P7141/1:b..l
	(detected by 0, t=10502 jiffies, g=39677, q=101 ncpus=2)
task:udevd           state:R  running task     stack:23472 pid:7141  ppid:3638   flags:0x00004002
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:preempt_count arch/x86/include/asm/preempt.h:27 [inline]
RIP: 0010:check_kcov_mode kernel/kcov.c:182 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0xc/0x60 kernel/kcov.c:216
Code: 89 fb e8 17 00 00 00 48 8b 3d f0 52 9d 0c 48 89 de 5b e9 67 21 50 00 00 00 cc cc 00 00 cc 48 8b 04 24 65 48 8b 0d c4 fc 7f 7e <65> 8b 15 c5 fc 7f 7e 81 e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75
RSP: 0018:ffffc90003b87738 EFLAGS: 00000246
RAX: ffffffff8a19fa69 RBX: 00007fe90181dfff RCX: ffff88802bcdbb80
RDX: 0000000000000000 RSI: 00007fe90181dfff RDI: 00007fe90181dfff
RBP: ffffc90003b878f0 R08: ffff88802bcdbb80 R09: 0000000000000003
R10: 0000000000000003 R11: 0000000000000000 R12: 000000000000000e
R13: 00007fe90181dfff R14: ffff888077c21800 R15: 0000000000000001
 mas_data_end lib/maple_tree.c:1496 [inline]
 mt_validate_nulls lib/maple_tree.c:7200 [inline]
 mt_validate+0x47d9/0x4cb0 lib/maple_tree.c:7249
 validate_mm_mt+0xe2/0x440 mm/mmap.c:295
 validate_mm+0xe1/0x2e0 mm/mmap.c:332
 do_mas_align_munmap+0x1015/0x12b0 mm/mmap.c:2599
 do_mas_munmap+0x240/0x2b0 mm/mmap.c:2650
 __vm_munmap+0x1ac/0x2d0 mm/mmap.c:2936
 __do_sys_munmap mm/mmap.c:2961 [inline]
 __se_sys_munmap mm/mmap.c:2958 [inline]
 __x64_sys_munmap+0x5c/0x70 mm/mmap.c:2958
 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: 0033:0x7fe90191e097
RSP: 002b:00007ffe2c8c9b08 EFLAGS: 00000246 ORIG_RAX: 000000000000000b
RAX: ffffffffffffffda RBX: 0000564560ed8e00 RCX: 00007fe90191e097
RDX: 0000564560ee66f8 RSI: 0000000000000200 RDI: 00007fe901f54000
RBP: 0000000000000007 R08: 0000564560edd4f0 R09: 0000000000000003
R10: 0000000000000040 R11: 0000000000000246 R12: 0000564560ed10b0
R13: 00007fe90202139c R14: 0000000000000e00 R15: 0000000000000009
 </TASK>
rcu: rcu_preempt kthread starved for 9462 jiffies! g39677 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:26992 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
 schedule+0xb9/0x180 kernel/sched/core.c:6638
 schedule_timeout+0x184/0x2d0 kernel/time/timer.c:2168
 rcu_gp_fqs_loop+0x303/0x1340 kernel/rcu/tree.c:1706
 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