[ 6304.679770] rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
[ 6304.679973] rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-3): P18377/1:b..l
[ 6304.680080] rcu: 	(detected by 2, t=4872428 jiffies, g=520485, q=341 ncpus=4)
[ 6304.680179] task:ping            state:D stack:12752 pid:18377 tgid:18377 ppid:18376  task_flags:0x40010c flags:0x00004002
[ 6304.680323] Call Trace:
[ 6304.680363]  <TASK>
[ 6304.680404]  __schedule+0x4fc/0xb40
[ 6304.680461]  schedule+0x27/0xd0
[ 6304.680495]  __lock_sock+0x7b/0xc0
[ 6304.680528]  ? housekeeping_test_cpu+0x40/0x40
[ 6304.680573]  __lock_sock_fast+0x39/0x60
[ 6304.680605]  udp_destroy_sock+0x13/0xb0
[ 6304.680641]  sk_common_release+0x1e/0xf0
[ 6304.680673]  inet_release+0x3d/0x70
[ 6304.680705]  __sock_release+0x38/0xb0
[ 6304.680741]  sock_close+0x15/0x20
[ 6304.680772]  __fput+0xda/0x290
[ 6304.680839]  task_work_run+0x59/0x80
[ 6304.680877]  do_exit+0x26c/0xae0
[ 6304.680915]  make_task_dead+0x7d/0x160
[ 6304.680946]  rewind_stack_and_make_dead+0x16/0x20
[ 6304.680991] RIP: 0033:0x7fa844600d77
[ 6304.681022] RSP: 002b:00007ffd59576878 EFLAGS: 00000246 ORIG_RAX: 000000000000002a
[ 6304.681079] RAX: ffffffffffffffda RBX: 00007ffd595779a8 RCX: 00007fa844600d77
[ 6304.681136] RDX: 0000000000000010 RSI: 00007ffd595768e0 RDI: 0000000000000007
[ 6304.681193] RBP: 00007ffd59576f30 R08: 00000000000000ff R09: 0000000000000000
[ 6304.681263] R10: 00007fa8444f85a0 R11: 0000000000000246 R12: 00007ffd59577288
[ 6304.681319] R13: 000000000040305a R14: 0000000000415dd0 R15: 00007fa84476c000
[ 6304.681383]  </TASK>