[ 9853.189587] rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
[ 9853.189785] rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-3): P16475/1:b..l
[ 9853.189837] rcu: 	(detected by 2, t=9093808 jiffies, g=92721, q=127 ncpus=4)
[ 9853.189888] task:ping            state:D stack:12752 pid:16475 tgid:16475 ppid:16364  task_flags:0x40010c flags:0x00004002
[ 9853.189969] Call Trace:
[ 9853.189991]  <TASK>
[ 9853.190015]  __schedule+0x4fc/0xb40
[ 9853.190054]  schedule+0x27/0xd0
[ 9853.190081]  __lock_sock+0x7b/0xc0
[ 9853.190110]  ? housekeeping_test_cpu+0x40/0x40
[ 9853.190149]  __lock_sock_fast+0x39/0x60
[ 9853.190178]  udp_destroy_sock+0x13/0xb0
[ 9853.190208]  sk_common_release+0x1e/0xf0
[ 9853.190236]  inet_release+0x3d/0x70
[ 9853.190265]  __sock_release+0x38/0xb0
[ 9853.190294]  sock_close+0x15/0x20
[ 9853.190322]  __fput+0xda/0x290
[ 9853.190356]  task_work_run+0x59/0x80
[ 9853.190389]  do_exit+0x26c/0xae0
[ 9853.190424]  make_task_dead+0x7d/0x160
[ 9853.190452]  rewind_stack_and_make_dead+0x16/0x20
[ 9853.190492] RIP: 0033:0x7fe07f8e9d77
[ 9853.190520] RSP: 002b:00007ffc2d6692a8 EFLAGS: 00000246 ORIG_RAX: 000000000000002a
[ 9853.190571] RAX: ffffffffffffffda RBX: 00007ffc2d66a986 RCX: 00007fe07f8e9d77
[ 9853.190622] RDX: 0000000000000010 RSI: 00007ffc2d669310 RDI: 0000000000000007
[ 9853.190667] RBP: 00007ffc2d669960 R08: 000000001140c710 R09: 0000000000000000
[ 9853.190713] R10: 00007fe07f7e15a0 R11: 0000000000000246 R12: 00007ffc2d669cb8
[ 9853.190764] R13: 000000000040305a R14: 0000000000415dd0 R15: 00007fe07fa55000
[ 9853.190811]  </TASK>