rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P5481/1:b..l
rcu: 	(detected by 0, t=10503 jiffies, g=55101, q=1571 ncpus=2)
task:dhcpcd          state:R  running task     stack:21024 pid:5481  tgid:5481  ppid:5480   task_flags:0x400140 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5295 [inline]
 __schedule+0x1585/0x5340 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:__page_table_check_zero+0x1a3/0x3e0 mm/page_table_check.c:139
Code: 9a 48 c1 e8 03 48 89 44 24 18 83 7c 24 04 1f 0f 87 0e 01 00 00 e8 dd c1 89 ff 4c 89 e7 48 8b 5c 24 20 48 89 de e8 2d c4 89 ff <4c> 39 e3 0f 84 51 01 00 00 48 8b 1d bd 9c 50 0c 4c 01 fb 48 89 df
RSP: 0018:ffffc900038c72f8 EFLAGS: 00000293
RAX: ffffffff823bc613 RBX: 0000000000000004 RCX: ffff888026be9e40
RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000001
RBP: dffffc0000000000 R08: ffff88801d0070cf R09: 1ffff11003a00e19
R10: dffffc0000000000 R11: ffffed1003a00e1a R12: 0000000000000001
R13: 0000000000050169 R14: dffffc0000000000 R15: ffff88801d0070d0
 page_table_check_free include/linux/page_table_check.h:46 [inline]
 __free_pages_prepare mm/page_alloc.c:1433 [inline]
 __free_frozen_pages+0xc10/0xd90 mm/page_alloc.c:2977
 __slab_free+0x263/0x2b0 mm/slub.c:5532
 qlink_free mm/kasan/quarantine.c:163 [inline]
 qlist_free_all+0x97/0x100 mm/kasan/quarantine.c:179
 kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286
 __kasan_kmalloc+0x22/0xb0 mm/kasan/common.c:406
 kasan_kmalloc include/linux/kasan.h:263 [inline]
 __do_kmalloc_node mm/slub.c:5219 [inline]
 __kmalloc_node_track_caller_noprof+0x4db/0x7b0 mm/slub.c:5327
 kmalloc_reserve net/core/skbuff.c:635 [inline]
 __alloc_skb+0x2c1/0x7d0 net/core/skbuff.c:713
 alloc_skb include/linux/skbuff.h:1383 [inline]
 alloc_skb_with_frags+0xca/0x890 net/core/skbuff.c:6750
 sock_alloc_send_pskb+0x878/0x990 net/core/sock.c:2995
 unix_dgram_sendmsg+0x460/0x18e0 net/unix/af_unix.c:2125
 sock_sendmsg_nosec net/socket.c:727 [inline]
 __sock_sendmsg net/socket.c:742 [inline]
 sock_write_iter+0x503/0x550 net/socket.c:1195
 do_iter_readv_writev+0x619/0x8c0 fs/read_write.c:-1
 vfs_writev+0x33c/0x990 fs/read_write.c:1059
 do_writev+0x154/0x2e0 fs/read_write.c:1105
 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: 0033:0x7f6eac129407
RSP: 002b:00007ffcf10680b0 EFLAGS: 00000202 ORIG_RAX: 0000000000000014
RAX: ffffffffffffffda RBX: 00007f6eac09f740 RCX: 00007f6eac129407
RDX: 0000000000000005 RSI: 00007ffcf1068110 RDI: 0000000000000017
RBP: 00005625d263b960 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 00007ffcf1088530
R13: 0000000000000004 R14: 0000000000000148 R15: 00007ffcf1078300
 </TASK>