[  OK  ] Listening on Load/Save RF Kill Switch Status /dev/rfkill Watch.
[  OK  ] Started Getty on tty6.
[  OK  ] Started Getty on tty5.
[  OK  ] Started Getty on tty4.
[  OK  ] Started Getty on tty3.
[  OK  ] Started Getty on tty2.
[  OK  ] Started Getty on tty1.
[  OK  ] Started Serial Getty on ttyS0.
[  OK  ] Reached target Login Prompts.
[  OK  ] Reached target Multi-User System.
[  OK  ] Reached target Graphical Interface.
         Starting Update UTMP about System Runlevel Changes...
         Starting Load/Save RF Kill Switch Status...
[  OK  ] Started Update UTMP about System Runlevel Changes.
[  OK  ] Started Load/Save RF Kill Switch Status.


Debian GNU/Linux 9 syzkaller ttyS0

Warning: Permanently added '10.128.0.86' (ECDSA) to the list of known hosts.
executing program
syzkaller login: [   66.261811][   T28] audit: type=1400 audit(1593057296.268:8): avc:  denied  { execmem } for  pid=6802 comm="syz-executor383" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1
[   66.276142][ T6803] IPVS: ftp: loaded support on port[0] = 21
[   66.374571][    T7] 
[   66.377093][    T7] =============================
[   66.381957][    T7] WARNING: suspicious RCU usage
[   66.388883][    T7] 5.7.0-syzkaller #0 Not tainted
[   66.394480][    T7] -----------------------------
[   66.399604][    T7] include/linux/radix-tree.h:176 suspicious rcu_dereference_check() usage!
[   66.408992][    T7] 
[   66.408992][    T7] other info that might help us debug this:
[   66.408992][    T7] 
[   66.419651][    T7] 
[   66.419651][    T7] rcu_scheduler_active = 2, debug_locks = 1
[   66.428137][    T7] 2 locks held by kworker/u4:0/7:
[   66.433325][    T7]  #0: ffff88821b0bd138 ((wq_completion)qrtr_ns_handler){+.+.}-{0:0}, at: process_one_work+0x844/0x16a0
[   66.444631][    T7]  #1: ffffc90000cdfdc0 ((work_completion)(&qrtr_ns.work)){+.+.}-{0:0}, at: process_one_work+0x878/0x16a0
[   66.456355][    T7] 
[   66.456355][    T7] stack backtrace:
[   66.462346][    T7] CPU: 1 PID: 7 Comm: kworker/u4:0 Not tainted 5.7.0-syzkaller #0
[   66.470132][    T7] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   66.480234][    T7] Workqueue: qrtr_ns_handler qrtr_ns_worker
[   66.486128][    T7] Call Trace:
[   66.489424][    T7]  dump_stack+0x188/0x20d
[   66.493787][    T7]  ctrl_cmd_new_lookup+0x6eb/0x7e0
[   66.498881][    T7]  ? qrtr_recvmsg+0x38a/0x810
[   66.503544][    T7]  ? node_get+0xd0/0xd0
[   66.507683][    T7]  ? rcu_read_lock_sched_held+0x9c/0xd0
[   66.513212][    T7]  ? rcu_read_lock_any_held.part.0+0x50/0x50
[   66.519165][    T7]  ? qrtr_node_lookup+0xe0/0xe0
[   66.524101][    T7]  qrtr_ns_worker+0x5a1/0x153a
[   66.528957][    T7]  ? ctrl_cmd_del_client.isra.0+0x6c0/0x6c0
[   66.534850][    T7]  ? lock_acquire+0x1f2/0x8f0
[   66.539507][    T7]  ? process_one_work+0x878/0x16a0
[   66.545823][    T7]  ? rcu_read_lock_sched_held+0x9c/0xd0
[   66.551370][    T7]  ? rcu_read_lock_any_held.part.0+0x50/0x50
[   66.557427][    T7]  process_one_work+0x965/0x16a0
[   66.562365][    T7]  ? lock_release+0x800/0x800
[   66.567043][    T7]  ? pwq_dec_nr_in_flight+0x310/0x310
[   66.572414][    T7]  ? rwlock_bug.