rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P6502/1:b..l
rcu: 	(detected by 0, t=10502 jiffies, g=5601, q=2981240 ncpus=2)
task:udevd           state:R  running task     stack:0     pid:6502  tgid:6502  ppid:6104   task_flags:0x400140 flags:0x00000008
Call trace:
 __switch_to+0x414/0x834 arch/arm64/kernel/process.c:735 (T)
 context_switch kernel/sched/core.c:5382 [inline]
 __schedule+0x13b0/0x28d4 kernel/sched/core.c:6767
 preempt_schedule_irq+0x80/0x188 kernel/sched/core.c:7090
 arm64_preempt_schedule_irq+0x44/0x58 arch/arm64/kernel/entry-common.c:301
 __el1_irq arch/arm64/kernel/entry-common.c:586 [inline]
 el1_interrupt+0x3c/0x54 arch/arm64/kernel/entry-common.c:598
 el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:603
 el1h_64_irq+0x6c/0x70 arch/arm64/kernel/entry.S:596
 lock_is_held_type+0x148/0x198 kernel/locking/lockdep.c:5943 (P)
 lock_is_held include/linux/lockdep.h:249 [inline]
 rcu_read_lock_held+0x34/0x50 kernel/rcu/update.c:351
 lookup_page_ext mm/page_ext.c:254 [inline]
 page_ext_lookup+0xec/0x164 mm/page_ext.c:520
 page_ext_iter_begin include/linux/page_ext.h:132 [inline]
 __page_table_check_zero+0x180/0x414 mm/page_table_check.c:139
 page_table_check_free include/linux/page_table_check.h:43 [inline]
 free_pages_prepare mm/page_alloc.c:1259 [inline]
 __free_frozen_pages+0xc0c/0xd14 mm/page_alloc.c:2721
 free_frozen_pages+0x14/0x20 mm/page_alloc.c:2759
 __free_slab+0x110/0x1e8 mm/slub.c:2687
 free_slab+0x24/0x120 mm/slub.c:2710
 discard_slab mm/slub.c:2716 [inline]
 __put_partials+0x19c/0x244 mm/slub.c:3185
 put_cpu_partial+0x164/0x1c0 mm/slub.c:3260
 __slab_free+0x1b0/0x280 mm/slub.c:4512
 do_slab_free mm/slub.c:4594 [inline]
 ___cache_free+0x150/0x170 mm/slub.c:4700
 qlink_free+0x48/0x94 mm/kasan/quarantine.c:163
 qlist_free_all+0x44/0xb8 mm/kasan/quarantine.c:179
 kasan_quarantine_reduce+0x118/0x124 mm/kasan/quarantine.c:286
 __kasan_slab_alloc+0x2c/0x88 mm/kasan/common.c:329
 kasan_slab_alloc include/linux/kasan.h:250 [inline]
 slab_post_alloc_hook mm/slub.c:4147 [inline]
 slab_alloc_node mm/slub.c:4196 [inline]
 __do_kmalloc_node mm/slub.c:4326 [inline]
 __kmalloc_node_track_caller_noprof+0x2b4/0x4d0 mm/slub.c:4346
 kmalloc_reserve+0x124/0x268 net/core/skbuff.c:599
 __alloc_skb+0x170/0x2ec net/core/skbuff.c:668
 alloc_skb include/linux/skbuff.h:1340 [inline]
 alloc_skb_with_frags+0xb8/0x678 net/core/skbuff.c:6639
 sock_alloc_send_pskb+0x758/0x874 net/core/sock.c:2954
 unix_dgram_sendmsg+0x454/0x121c net/unix/af_unix.c:2007
 sock_sendmsg_nosec net/socket.c:712 [inline]
 __sock_sendmsg net/socket.c:727 [inline]
 sock_write_iter+0x25c/0x378 net/socket.c:1131
 new_sync_write fs/read_write.c:591 [inline]
 vfs_write+0x62c/0x97c fs/read_write.c:684
 ksys_write+0x120/0x210 fs/read_write.c:736
 __do_sys_write fs/read_write.c:747 [inline]
 __se_sys_write fs/read_write.c:744 [inline]
 __arm64_sys_write+0x7c/0x90 fs/read_write.c:744
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49
 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
 el0_svc+0x58/0x17c arch/arm64/kernel/entry-common.c:767
 el0t_64_sync_handler+0x78/0x108 arch/arm64/kernel/entry-common.c:786
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600