Debian GNU/Linux 9 syzkaller ttyS0

Warning: Permanently added '10.128.0.24' (ECDSA) to the list of known hosts.
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syzkaller login: [   56.320384][  T141] 
[   56.323030][  T141] =============================
[   56.329477][  T141] WARNING: suspicious RCU usage
[   56.334343][  T141] 5.7.0-syzkaller #0 Not tainted
[   56.340822][  T141] -----------------------------
[   56.345671][  T141] include/linux/radix-tree.h:176 suspicious rcu_dereference_check() usage!
[   56.355231][  T141] 
[   56.355231][  T141] other info that might help us debug this:
[   56.355231][  T141] 
[   56.366106][  T141] 
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[   56.366106][  T141] rcu_scheduler_active = 2, debug_locks = 1
[   56.374747][  T141] 2 locks held by kworker/u4:4/141:
[   56.381116][  T141]  #0: ffff8880a9136938 ((wq_completion)qrtr_ns_handler){+.+.}-{0:0}, at: process_one_work+0x844/0x16a0
[   56.392978][  T141]  #1: ffffc90001417dc0 ((work_completion)(&qrtr_ns.work)){+.+.}-{0:0}, at: process_one_work+0x878/0x16a0
[   56.405032][  T141] 
[   56.405032][  T141] stack backtrace:
[   56.411559][  T141] CPU: 1 PID: 141 Comm: kworker/u4:4 Not tainted 5.7.0-syzkaller #0
[   56.419536][  T141] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   56.431438][  T141] Workqueue: qrtr_ns_handler qrtr_ns_worker
[   56.437341][  T141] Call Trace:
[   56.440647][  T141]  dump_stack+0x188/0x20d
[   56.445431][  T141]  ctrl_cmd_new_lookup+0x6eb/0x7e0
[   56.450535][  T141]  ? qrtr_recvmsg+0x38a/0x810
[   56.455410][  T141]  ? node_get+0xd0/0xd0
[   56.459661][  T141]  ? rcu_read_lock_sched_held+0x9c/0xd0
[   56.465197][  T141]  ? rcu_read_lock_any_held.part.0+0x50/0x50
[   56.471254][  T141]  ? qrtr_node_lookup+0xe0/0xe0
[   56.476216][  T141]  qrtr_ns_worker+0x5a1/0x153a
[   56.480970][  T141]  ? ctrl_cmd_del_client.isra.0+0x6c0/0x6c0
[   56.486859][  T141]  ? lock_acquire+0x1f2/0x8f0
[   56.491542][  T141]  ? process_one_work+0x878/0x16a0
[   56.496656][  T141]  ? rcu_read_lock_sched_held+0x9c/0xd0
[   56.502295][  T141]  ? rcu_read_lock_any_held.part.0+0x50/0x50
[   56.508260][  T141]  process_one_work+0x965/0x16a0
[   56.513196][  T141]  ? lock_release+0x800/0x800
[   56.517958][  T141]  ? pwq_dec_nr_in_flight+0x310/0x310
[   56.523313][  T141]  ? rwlock_bug.part.0+0x90/0x90
[   56.528248][  T141]  worker_thread+0x96/0xe20
[   56.532739][  T141]  ? process_one_work+0x16a0/0x16a0
[   56.537930][  T141]  kthread+0x388/0x470
[   56.542010][  T141]  ? kthread_mod_delayed_work+0x1a0/0x1a0
[   56.547723][  T141]  ? kthread_mod_delayed_work+0x1a0/0x1a0
[   56.553426][  T141]  ret_from_fork+0x24/0x30
[   56.566694][  T141] failed to send lookup notification
[   56.572080][  T141] failed to send lookup notification
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