rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P9633/1:b..l
rcu: 	(detected by 0, t=10502 jiffies, g=50717, q=434 ncpus=2)
task:modprobe        state:R  running task     stack:26464 pid:9633  ppid:12     flags:0x00000000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5343 [inline]
 __schedule+0xc9a/0x5880 kernel/sched/core.c:6669
 preempt_schedule_irq+0x52/0x90 kernel/sched/core.c:6981
 irqentry_exit+0x35/0x80 kernel/entry/common.c:433
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:645
RIP: 0010:__sanitizer_cov_trace_switch+0x4f/0x90 kernel/kcov.c:340
Code: 83 f8 10 75 2f 41 bd 03 00 00 00 4c 8b 75 00 31 db 4d 85 f6 74 1e 48 8b 74 dd 10 4c 89 e2 4c 89 ef 48 83 c3 01 48 8b 4c 24 28 <e8> 1c fe ff ff 49 39 de 75 e2 5b 5d 41 5c 41 5d 41 5e c3 48 83 f8
RSP: 0018:ffffc9000518f660 EFLAGS: 00000202
RAX: 0000000000000020 RBX: 0000000000000001 RCX: ffffffff8a01de80
RDX: 0000000000000001 RSI: 0000000000000000 RDI: 0000000000000005
RBP: ffffffff8b8c2a80 R08: 0000000000000007 R09: 0000000000000000
R10: 00007fc1447d5fff R11: 0000000000094001 R12: 0000000000000001
R13: 0000000000000005 R14: 0000000000000003 R15: ffff888077a15a00
 ma_slots lib/maple_tree.c:803 [inline]
 mas_get_slot lib/maple_tree.c:6646 [inline]
 mas_validate_gaps lib/maple_tree.c:6944 [inline]
 mt_validate+0x26b0/0x41f0 lib/maple_tree.c:7212
 validate_mm_mt+0xa1/0x3f0 mm/mmap.c:314
 validate_mm+0xa0/0x290 mm/mmap.c:351
 remove_mt mm/mmap.c:2200 [inline]
 do_vmi_align_munmap+0x126b/0x1640 mm/mmap.c:2468
 do_vmi_munmap+0x26e/0x2c0 mm/mmap.c:2527
 mmap_region+0x1f0/0x28e0 mm/mmap.c:2575
 do_mmap+0x837/0xf60 mm/mmap.c:1394
 vm_mmap_pgoff+0x1a2/0x3b0 mm/util.c:543
 ksys_mmap_pgoff+0x42b/0x5b0 mm/mmap.c:1440
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fc1448c3b74
RSP: 002b:00007fff47c8c9d8 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007fff47c8ca88 RCX: 00007fc1448c3b74
RDX: 0000000000000003 RSI: 0000000000006000 RDI: 00007fc1447d0000
RBP: 00007fff47c8d170 R08: 0000000000000000 R09: 000000000019d000
R10: 0000000000000812 R11: 0000000000000246 R12: 00007fc1448a65c0
R13: 00007fff47c8d1f8 R14: 000000000019d264 R15: 0000000000000000
 </TASK>
rcu: rcu_preempt kthread starved for 10497 jiffies! g50717 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:28232 pid:16    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5343 [inline]
 __schedule+0xc9a/0x5880 kernel/sched/core.c:6669
 schedule+0xde/0x1a0 kernel/sched/core.c:6745
 schedule_timeout+0x14e/0x2b0 kernel/time/timer.c:2167
 rcu_gp_fqs_loop+0x190/0x910 kernel/rcu/tree.c:1609
 rcu_gp_kthread+0x23a/0x360 kernel/rcu/tree.c:1808
 kthread+0x344/0x440 kernel/kthread.c:379
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
 </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 __intel_idle_hlt drivers/idle/intel_idle.c:205 [inline]
NMI backtrace for cpu 1 skipped: idling at intel_idle_hlt+0x23/0x30 drivers/idle/intel_idle.c:224