rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P5190/1:b..l
rcu: 	(detected by 1, t=10503 jiffies, g=107041, q=432 ncpus=2)
task:udevd           state:R  running task     stack:22912 pid:5190  tgid:5190  ppid:1      task_flags:0x400140 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5295 [inline]
 __schedule+0x1539/0x5110 kernel/sched/core.c:6907
 preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7234
 irqentry_exit+0x599/0x620 kernel/entry/common.c:239
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:unwind_next_frame+0x1a8/0x23c0 arch/x86/kernel/unwind_orc.c:510
Code: 4c 89 64 24 20 4c 89 7c 24 50 48 89 5c 24 18 0f b6 1b 48 8b 44 24 30 80 3c 28 00 4c 8b 7c 24 10 74 08 4c 89 ff e8 28 df b8 00 <4d> 8b 27 48 83 f3 01 48 c7 c2 c0 a4 c9 8b 49 29 dc 0f 84 b2 02 00
RSP: 0018:ffffc900032d7998 EFLAGS: 00000246
RAX: 1ffff9200065af56 RBX: 0000000000000000 RCX: 0000000080000001
RDX: 000000005a44979c RSI: ffffffff8c297fe0 RDI: ffffffff8c297fa0
RBP: dffffc0000000000 R08: ffffffff8176da45 R09: ffffffff8e960160
R10: ffffc900032d7ab8 R11: ffffffff81b11100 R12: 1ffff9200065af4d
R13: ffffc900032d7ab8 R14: ffffc900032d7a68 R15: ffffc900032d7ab0
 arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122
 kasan_save_stack mm/kasan/common.c:57 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
 unpoison_slab_object mm/kasan/common.c:340 [inline]
 __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:366
 kasan_slab_alloc include/linux/kasan.h:253 [inline]
 slab_post_alloc_hook mm/slub.c:4456 [inline]
 slab_alloc_node mm/slub.c:4785 [inline]
 kmem_cache_alloc_noprof+0x2bc/0x650 mm/slub.c:4792
 alloc_filename fs/namei.c:142 [inline]
 do_getname+0x2e/0x250 fs/namei.c:182
 getname_flags fs/namei.c:225 [inline]
 getname include/linux/fs.h:2512 [inline]
 class_filename_constructor include/linux/fs.h:2539 [inline]
 __do_sys_unlink fs/namei.c:5574 [inline]
 __se_sys_unlink+0x1e/0x140 fs/namei.c:5572
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7faf02515937
RSP: 002b:00007ffe0c1f5068 EFLAGS: 00000202 ORIG_RAX: 0000000000000057
RAX: ffffffffffffffda RBX: 0000000000000bb8 RCX: 00007faf02515937
RDX: 0000000000000000 RSI: 0000000046b0ec80 RDI: 0000564bc349a02e
RBP: 0000000000000000 R08: 0000000046b161ac R09: 3fffffffffffffff
R10: 4000000000000000 R11: 0000000000000202 R12: 0000000000000000
R13: 0000564bc34b5100 R14: 0000000000000001 R15: 0000000000000000
 </TASK>