rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P5201/1:b..l
rcu: 	(detected by 0, t=10502 jiffies, g=11405, q=46162 ncpus=2)
task:udevd           state:R  running task     stack:23976 pid:5201  tgid:5201  ppid:1      task_flags:0x400140 flags:0x00000002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5382 [inline]
 __schedule+0x1b33/0x51f0 kernel/sched/core.c:6767
 preempt_schedule_irq+0xfe/0x1c0 kernel/sched/core.c:7090
 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:rcu_lockdep_current_cpu_online+0xf1/0x120 kernel/rcu/tree.c:3996
Code: 81 00 4c 23 3b 75 1a 48 c7 c7 80 36 d4 8e be 04 00 00 00 e8 81 ef 81 00 83 3d 7a 37 2b 0d 00 74 15 b0 01 65 ff 0d 1f 71 bc 11 <74> 0e 5b 41 5e 41 5f c3 cc cc cc cc 31 c0 eb e9 e8 9a 78 81 ff eb
RSP: 0018:ffffc9000241fa78 EFLAGS: 00000286
RAX: 1ffffffff1da8501 RBX: ffffffff8ed42df0 RCX: 0000000080000000
RDX: 0000000000000000 RSI: ffffffff8ca0e240 RDI: ffff8880b873a960
RBP: 00000000000001a0 R08: ffffffff8236aeae R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 000000000006b320
R13: ffffea0001acc800 R14: dffffc0000000000 R15: 0000000000000002
 rcu_read_lock_held_common kernel/rcu/update.c:113 [inline]
 rcu_read_lock_held+0x1e/0x50 kernel/rcu/update.c:349
 lookup_page_ext mm/page_ext.c:254 [inline]
 page_ext_get+0x192/0x2a0 mm/page_ext.c:539
 __reset_page_owner+0x29/0x1e0 mm/page_owner.c:294
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1262 [inline]
 __free_frozen_pages+0xddf/0x10a0 mm/page_alloc.c:2680
 discard_slab mm/slub.c:2720 [inline]
 __put_partials+0x160/0x1c0 mm/slub.c:3189
 put_cpu_partial+0x17e/0x250 mm/slub.c:3264
 __slab_free+0x294/0x390 mm/slub.c:4516
 qlink_free mm/kasan/quarantine.c:163 [inline]
 qlist_free_all+0x9a/0x140 mm/kasan/quarantine.c:179
 kasan_quarantine_reduce+0x14f/0x170 mm/kasan/quarantine.c:286
 __kasan_slab_alloc+0x23/0x80 mm/kasan/common.c:329
 kasan_slab_alloc include/linux/kasan.h:250 [inline]
 slab_post_alloc_hook mm/slub.c:4151 [inline]
 slab_alloc_node mm/slub.c:4200 [inline]
 kmem_cache_alloc_noprof+0x1e1/0x390 mm/slub.c:4207
 getname_flags+0xb6/0x530 fs/namei.c:146
 do_readlinkat+0xd7/0x380 fs/stat.c:563
 __do_sys_readlink fs/stat.c:601 [inline]
 __se_sys_readlink fs/stat.c:598 [inline]
 __x64_sys_readlink+0x7f/0x90 fs/stat.c:598
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff568917d47
RSP: 002b:00007fff668064c8 EFLAGS: 00000206 ORIG_RAX: 0000000000000059
RAX: ffffffffffffffda RBX: 00007fff66807138 RCX: 00007ff568917d47
RDX: 0000000000000400 RSI: 00007fff668068d8 RDI: 00007fff668064d8
RBP: 00007fff66806d18 R08: 000055748b88e1fd R09: 0000000000000000
R10: 0000000000000010 R11: 0000000000000206 R12: 0000000000000200
R13: 00007fff668068d8 R14: 00007fff668064d8 R15: 0000000000000000
 </TASK>