TITLE: INFO: rcu detected stall in netlink_sendmsg

[  480.173025] INFO: rcu_sched self-detected stall on CPU
[  480.178536] 	1-....: (104999 ticks this GP) idle=002/1/4611686018427387906 softirq=125049/125058 fqs=26224 
[  480.188655] 	 (t=105000 jiffies g=69343 c=69342 q=1302)
[  480.194010] NMI backtrace for cpu 1
[  480.197631] CPU: 1 PID: 29490 Comm: syz-executor5 Not tainted 4.18.0-rc7+ #170
[  480.204969] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[  480.214301] Call Trace:
[  480.216863]  <IRQ>
[  480.219013]  dump_stack+0x1c9/0x2b4
[  480.231770]  nmi_cpu_backtrace.cold.4+0x19/0xce
[  480.241597]  nmi_trigger_cpumask_backtrace+0x151/0x192
[  480.246859]  arch_trigger_cpumask_backtrace+0x14/0x20
[  480.252036]  rcu_dump_cpu_stacks+0x175/0x1c2
[  480.261519]  check_cpu_stall.isra.60.cold.78+0x36c/0x5a6
[  480.326256]  rcu_check_callbacks+0x23f/0xcd0
[  480.398507]  update_process_times+0x2d/0x70
[  480.402812]  tick_sched_handle+0x9f/0x180
[  480.406950]  tick_sched_timer+0x45/0x130
[  480.410995]  __hrtimer_run_queues+0x3eb/0x10c0
[  480.459331]  hrtimer_interrupt+0x2f3/0x750
[  480.463559]  smp_apic_timer_interrupt+0x165/0x730
[  480.490977]  apic_timer_interrupt+0xf/0x20
[  480.495190]  </IRQ>
[  480.497429] RIP: 0010:lock_acquire+0x25f/0x540
[  480.521174] RSP: 0018:ffff8801999a67c0 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13
[  480.528871] RAX: dffffc0000000000 RBX: 1ffff10033334cfd RCX: 0000000000000000
[  480.536121] RDX: 1ffffffff0fe3615 RSI: 0000000000000000 RDI: 0000000000000286
[  480.543371] RBP: ffff8801999a68b0 R08: 0000000000000008 R09: 0000000000000002
[  480.550624] R10: ffff880192d5c908 R11: 632564d1cb2a3fed R12: ffff880192d5c080
[  480.557874] R13: 0000000000000002 R14: 0000000000000000 R15: 0000000000000000
[  480.585903]  tipc_sk_lookup+0x131/0xfa0
[  480.642175]  tipc_nl_publ_dump+0x243/0xfa2
[  480.687542]  __tipc_nl_compat_dumpit.isra.11+0x20b/0xad0
[  480.717699]  tipc_nl_compat_sk_dump+0x87c/0xca0
[  480.769074]  __tipc_nl_compat_dumpit.isra.11+0x337/0xad0
[  480.788328]  tipc_nl_compat_dumpit+0x1f4/0x440
[  480.798089]  tipc_nl_compat_recv+0x12b3/0x19a0
[  480.825649]  genl_family_rcv_msg+0x8a3/0x1140
[  480.855652]  genl_rcv_msg+0xc6/0x168
[  480.859351]  netlink_rcv_skb+0x172/0x440
[  480.876417]  genl_rcv+0x28/0x40
[  480.879678]  netlink_unicast+0x5a0/0x760
[  480.898642]  netlink_sendmsg+0xa18/0xfd0
[  480.921151]  sock_sendmsg+0xd5/0x120
[  480.924856]  ___sys_sendmsg+0x7fd/0x930
[  480.963667]  __sys_sendmsg+0x11d/0x290
[  480.984618]  __x64_sys_sendmsg+0x78/0xb0
[  480.988662]  do_syscall_64+0x1b9/0x820
[  481.012549]  entry_SYSCALL_64_after_hwframe+0x49/0xbe
[  481.017720] RIP: 0033:0x456a09
[  481.040077] RSP: 002b:00007f8665b39c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[  481.047767] RAX: ffffffffffffffda RBX: 00007f8665b3a6d4 RCX: 0000000000456a09
[  481.055026] RDX: 0000000000000000 RSI: 0000000020000000 RDI: 0000000000000022
[  481.062281] RBP: 00000000009300a0 R08: 0000000000000000 R09: 0000000000000000
[  481.076996] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
[  481.084255] R13: 00000000004d3058 R14: 00000000004c7d3e R15: 0000000000000000