TITLE: INFO: rcu detected stall in llcp_sock_sendmsg

[ 1098.520844] INFO: rcu_sched self-detected stall on CPU
[ 1098.520919] 	1-....: (20918 ticks this GP) idle=55a/1/4611686018427387906 softirq=11347/11347 fqs=20240 
[ 1098.520943] 	 (t=125005 jiffies g=5572 c=5571 q=149)
[ 1098.520955] NMI backtrace for cpu 1
[ 1098.520964] CPU: 1 PID: 4811 Comm: syz-executor0 Not tainted 4.18.0-rc1+ #115
[ 1098.520969] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 1098.521036] Call Trace:
[ 1098.521040]  <IRQ>
[ 1098.521119]  dump_stack+0x1c9/0x2b4
[ 1098.521173]  nmi_cpu_backtrace.cold.4+0x19/0xce
[ 1098.521197]  nmi_trigger_cpumask_backtrace+0x151/0x192
[ 1098.521209]  arch_trigger_cpumask_backtrace+0x14/0x20
[ 1098.521220]  rcu_dump_cpu_stacks+0x175/0x1c2
[ 1098.521245]  check_cpu_stall.isra.60.cold.78+0x36c/0x5a6
[ 1098.521438]  rcu_check_callbacks+0x23f/0xcd0
[ 1098.521611]  update_process_times+0x2d/0x70
[ 1098.521623]  tick_sched_handle+0x9f/0x180
[ 1098.521635]  tick_sched_timer+0x45/0x130
[ 1098.521645]  __hrtimer_run_queues+0x3eb/0x10c0
[ 1098.521777]  hrtimer_interrupt+0x2f3/0x750
[ 1098.521808]  smp_apic_timer_interrupt+0x165/0x730
[ 1098.521901]  apic_timer_interrupt+0xf/0x20
[ 1098.521906]  </IRQ>
[ 1098.521915] RIP: 0010:console_unlock+0xc84/0x10b0
[ 1098.522104] RSP: 0018:ffff8801aab0f358 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff13
[ 1098.522115] RAX: ffff8801aa2802c0 RBX: 0000000000000200 RCX: 1ffff10035450163
[ 1098.522121] RDX: 0000000000000000 RSI: ffffffff8162b8fb RDI: 0000000000000293
[ 1098.522127] RBP: ffff8801aab0f4c0 R08: ffff8801aa280af8 R09: 0000000000000006
[ 1098.522132] R10: ffff8801aa2802c0 R11: 0000000000000000 R12: 0000000000000000
[ 1098.522138] R13: ffffffff84ea9880 R14: 0000000000000001 R15: dffffc0000000000
[ 1098.522273]  vprintk_emit+0x6c6/0xdf0
[ 1098.522366]  vprintk_default+0x28/0x30
[ 1098.522375]  vprintk_func+0x7a/0xe7
[ 1098.522385]  printk+0xa7/0xcf
[ 1098.522435]  nfc_llcp_send_ui_frame.cold.9+0x18/0x1f
[ 1098.522507]  llcp_sock_sendmsg+0x278/0x350
[ 1098.522528]  sock_sendmsg+0xd5/0x120
[ 1098.522539]  ___sys_sendmsg+0x51d/0x930
[ 1098.522667]  __sys_sendmmsg+0x240/0x6f0
[ 1098.522794]  __x64_sys_sendmmsg+0x9d/0x100
[ 1098.522806]  do_syscall_64+0x1b9/0x820
[ 1098.522882]  entry_SYSCALL_64_after_hwframe+0x49/0xbe
[ 1098.522891] RIP: 0033:0x455a99
[ 1098.523077] RSP: 002b:00007ffec82fb2b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
[ 1098.523087] RAX: ffffffffffffffda RBX: 0000000001992914 RCX: 0000000000455a99
[ 1098.523093] RDX: 04924924924926b2 RSI: 00000000200026c0 RDI: 0000000000000004
[ 1098.523099] RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000
[ 1098.523104] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
[ 1098.523110] R13: 00000000004c0b44 R14: 00000000004d0980 R15: 0000000000000001