rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P4976/1:b..l
rcu: 	(detected by 0, t=10502 jiffies, g=85021, q=1876 ncpus=1)
task:udevd           state:R  running task     stack:23400 pid:4976  tgid:4976  ppid:1      task_flags:0x400140 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5510 [inline]
 __schedule+0x17d9/0x56c0 kernel/sched/core.c:7234
 preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7556
 irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:539 [inline]
 irqentry_exit+0x14f/0x8f0 kernel/entry/common.c:167
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:trace_lock_release include/trace/events/lock.h:68 [inline]
RIP: 0010:lock_release+0x4d/0x3c0 kernel/locking/lockdep.c:5879
Code: 24 28 0f 1f 44 00 00 65 8b 05 f3 c8 c9 11 83 f8 08 0f 83 56 02 00 00 89 c0 48 0f a3 05 dc 60 b4 0e 73 0d e8 25 f9 08 00 84 c0 <0f> 84 94 02 00 00 83 3d d6 93 b4 0e 00 0f 84 1c 02 00 00 65 8b 05
RSP: 0018:ffffc900048876d8 EFLAGS: 00000202
RAX: 0000000000000001 RBX: ffffc900048877f8 RCX: 0000000080000001
RDX: ffffc90004887801 RSI: ffffffff8c4bbf60 RDI: ffffffff8c4bbf20
RBP: 1ffffffff21f9401 R08: ffffc90004887bd8 R09: ffffc90004887838
R10: dffffc0000000000 R11: fffff52000910f09 R12: ffffc90004880000
R13: ffffffff8177827f R14: ffffffff8eb59c60 R15: ffffc90004887be8
 rcu_lock_release include/linux/rcupdate.h:310 [inline]
 rcu_read_unlock include/linux/rcupdate.h:871 [inline]
 class_rcu_destructor include/linux/rcupdate.h:1183 [inline]
 unwind_next_frame+0x1baa/0x2550 arch/x86/kernel/unwind_orc.c:709
 arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122
 save_stack+0x122/0x230 mm/page_owner.c:165
 __reset_page_owner+0x71/0x1f0 mm/page_owner.c:320
 reset_page_owner include/linux/page_owner.h:25 [inline]
 __free_pages_prepare mm/page_alloc.c:1406 [inline]
 __free_frozen_pages+0xc1e/0xd10 mm/page_alloc.c:2950
 __slab_free+0x274/0x2c0 mm/slub.c:5741
 qlink_free mm/kasan/quarantine.c:163 [inline]
 qlist_free_all+0x99/0x100 mm/kasan/quarantine.c:179
 kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286
 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:350
 kasan_slab_alloc include/linux/kasan.h:253 [inline]
 slab_post_alloc_hook mm/slub.c:4584 [inline]
 slab_alloc_node mm/slub.c:4917 [inline]
 kmem_cache_alloc_noprof+0x2a0/0x5f0 mm/slub.c:4931
 alloc_filename fs/namei.c:147 [inline]
 do_getname+0x2e/0x250 fs/namei.c:187
 getname include/linux/fs.h:2537 [inline]
 getname_maybe_null include/linux/fs.h:2544 [inline]
 class_filename_maybe_null_constructor include/linux/fs.h:2568 [inline]
 vfs_fstatat+0x45/0x170 fs/stat.c:368
 __do_sys_newfstatat fs/stat.c:538 [inline]
 __se_sys_newfstatat fs/stat.c:532 [inline]
 __x64_sys_newfstatat+0x151/0x200 fs/stat.c:532
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4dd4511b0a
RSP: 002b:00007ffe9dbe4758 EFLAGS: 00000246 ORIG_RAX: 0000000000000106
RAX: ffffffffffffffda RBX: 000055c044768408 RCX: 00007f4dd4511b0a
RDX: 00007ffe9dbe4760 RSI: 000055c044756ef3 RDI: 00000000ffffff9c
RBP: 000055c073c44148 R08: 00063489548db180 R09: 3fffffffffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffe9dbe4760 R14: 0000000000000000 R15: 00063489548db180
 </TASK>