[ 4879.131373] rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
[ 4879.131461] rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-3): P895/1:b..l
[ 4879.131506] rcu: 	(detected by 2, t=4872417 jiffies, g=4709, q=283 ncpus=4)
[ 4879.131551] task:ping            state:D stack:12752 pid:895   tgid:895   ppid:894    task_flags:0x40010c flags:0x00004002
[ 4879.131622] Call Trace:
[ 4879.131644]  <TASK>
[ 4879.131668]  __schedule+0x4fc/0xb40
[ 4879.131705]  schedule+0x27/0xd0
[ 4879.131732]  __lock_sock+0x7b/0xc0
[ 4879.131763]  ? housekeeping_test_cpu+0x40/0x40
[ 4879.131799]  __lock_sock_fast+0x39/0x60
[ 4879.131822]  udp_destroy_sock+0x13/0xb0
[ 4879.131852]  sk_common_release+0x1e/0xf0
[ 4879.131880]  inet_release+0x3d/0x70
[ 4879.131910]  __sock_release+0x38/0xb0
[ 4879.131939]  sock_close+0x15/0x20
[ 4879.131968]  __fput+0xda/0x290
[ 4879.131998]  task_work_run+0x59/0x80
[ 4879.132027]  do_exit+0x26c/0xae0
[ 4879.132061]  make_task_dead+0x7d/0x160
[ 4879.132090]  rewind_stack_and_make_dead+0x16/0x20
[ 4879.132128] RIP: 0033:0x7f0fa3080d77
[ 4879.132160] RSP: 002b:00007ffcbcbe4d68 EFLAGS: 00000246 ORIG_RAX: 000000000000002a
[ 4879.132212] RAX: ffffffffffffffda RBX: 00007ffcbcbe79a8 RCX: 00007f0fa3080d77
[ 4879.132264] RDX: 0000000000000010 RSI: 00007ffcbcbe4dd0 RDI: 0000000000000007
[ 4879.132316] RBP: 00007ffcbcbe5420 R08: 00000000000000ff R09: 0000000000000000
[ 4879.132362] R10: 00007f0fa2f785a0 R11: 0000000000000246 R12: 00007ffcbcbe5778
[ 4879.132408] R13: 000000000040305a R14: 0000000000415dd0 R15: 00007f0fa31ec000
[ 4879.132461]  </TASK>