rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P23727/1:b..l
rcu: 	(detected by 0, t=10503 jiffies, g=162577, q=428 ncpus=2)
task:modprobe        state:R  running task     stack:23680 pid:23727 tgid:23727 ppid:12     flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5408 [inline]
 __schedule+0x17e8/0x4a20 kernel/sched/core.c:6745
 preempt_schedule_irq+0xfb/0x1c0 kernel/sched/core.c:7067
 irqentry_exit+0x5e/0x90 kernel/entry/common.c:354
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x70 kernel/kcov.c:200
Code: 89 fb e8 23 00 00 00 48 8b 3d 3c 8d 45 0c 48 89 de 5b e9 33 38 5a 00 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <f3> 0f 1e fa 48 8b 04 24 65 48 8b 0c 25 c0 d4 03 00 65 8b 15 20 af
RSP: 0018:ffffc900153df750 EFLAGS: 00000293
RAX: 0000000000000000 RBX: 0000000000000001 RCX: ffff88802cadda00
RDX: 0000000000000006 RSI: ffffffff8f94c5a0 RDI: 0000000000000001
RBP: 0000000000000000 R08: 0000000000000005 R09: ffffffff8b7ad847
R10: 0000000000000006 R11: ffff88802cadda00 R12: ffffc900153df970
R13: ffffc900153df9a8 R14: dffffc0000000000 R15: dffffc0000000000
 mas_find_setup lib/maple_tree.c:5971 [inline]
 mas_find+0x253/0xbb0 lib/maple_tree.c:6064
 do_vmi_align_munmap+0xc03/0x18c0 mm/mmap.c:2649
 do_vmi_munmap+0x261/0x2f0 mm/mmap.c:2759
 mmap_region+0x72f/0x2090 mm/mmap.c:2810
 do_mmap+0x8ad/0xfa0 mm/mmap.c:1397
 vm_mmap_pgoff+0x1dd/0x3d0 mm/util.c:573
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6f8c457b74
RSP: 002b:00007fff48ddfd68 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007fff48ddfe18 RCX: 00007f6f8c457b74
RDX: 0000000000000003 RSI: 0000000000001888 RDI: 00007f6f8c1be000
RBP: 00007fff48de0140 R08: 00000000ffffffff R09: 0000000000000000
R10: 0000000000000032 R11: 0000000000000246 R12: 00007f6f8c434ac0
R13: 00007fff48de01c8 R14: 00007f6f8c1bf888 R15: 00007f6f8c1be000
 </TASK>
rcu: rcu_preempt kthread starved for 10539 jiffies! g162577 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:25328 pid:17    tgid:17    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5408 [inline]
 __schedule+0x17e8/0x4a20 kernel/sched/core.c:6745
 __schedule_loop kernel/sched/core.c:6822 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6837
 schedule_timeout+0x1be/0x310 kernel/time/timer.c:2581
 rcu_gp_fqs_loop+0x2df/0x1330 kernel/rcu/tree.c:2000
 rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:2202
 kthread+0x2f2/0x390 kernel/kthread.c:389
 ret_from_fork+0x4d/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 0 to CPUs 1:
NMI backtrace for cpu 1 skipped: idling at native_safe_halt arch/x86/include/asm/irqflags.h:48 [inline]
NMI backtrace for cpu 1 skipped: idling at arch_safe_halt arch/x86/include/asm/irqflags.h:86 [inline]
NMI backtrace for cpu 1 skipped: idling at acpi_safe_halt+0x21/0x30 drivers/acpi/processor_idle.c:112