rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P39/1:b..l
rcu: 	(detected by 0, t=10503 jiffies, g=166593, q=2089 ncpus=2)
task:khugepaged      state:R  running task     stack:28000 pid:39    tgid:39    ppid:2      task_flags:0x200040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5256 [inline]
 __schedule+0x1139/0x6150 kernel/sched/core.c:6863
 preempt_schedule_irq+0x51/0x90 kernel/sched/core.c:7190
 irqentry_exit+0x1d8/0x8c0 kernel/entry/common.c:216
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:__sanitizer_cov_trace_cmp1+0x0/0x20 kernel/kcov.c:275
Code: 38 4c 89 44 30 e0 4c 89 4c 30 e8 4c 89 54 30 f0 4a 89 4c d8 20 e9 40 2f ba 09 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <f3> 0f 1e fa 48 8b 0c 24 40 0f b6 d6 40 0f b6 f7 31 ff e9 49 ff ff
RSP: 0018:ffffc90000af75e0 EFLAGS: 00000293
RAX: 0000000000000000 RBX: 0000000000000008 RCX: ffffffff8b6c44c6
RDX: ffff88801fa83d00 RSI: 000000000000000d RDI: 0000000000000008
RBP: ffff888064942248 R08: 0000000000000006 R09: 00001fffffffefff
R10: 0000200000000000 R11: ffff88801fa84830 R12: 000000000000000d
R13: 0000000000000008 R14: 0000200000000000 R15: 00001fffffffefff
 mtree_range_walk+0x58b/0xc00 lib/maple_tree.c:2568
 mas_state_walk lib/maple_tree.c:3298 [inline]
 mt_find+0x4c5/0xa20 lib/maple_tree.c:6497
 find_vma+0xbf/0x140 mm/mmap.c:906
 hugepage_vma_revalidate.isra.0+0xfd/0x570 mm/khugepaged.c:911
 collapse_huge_page+0x49d/0x3420 mm/khugepaged.c:1120
 hpage_collapse_scan_pmd+0xd4b/0x13d0 mm/khugepaged.c:1407
 khugepaged_scan_mm_slot mm/khugepaged.c:2486 [inline]
 khugepaged_do_scan mm/khugepaged.c:2570 [inline]
 khugepaged+0x1228/0x1690 mm/khugepaged.c:2626
 kthread+0x3c5/0x780 kernel/kthread.c:463
 ret_from_fork+0x983/0xb10 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
 </TASK>