[[0;32m OK [0m] Reached target Graphical Interface.
Starting Update UTMP about System Runlevel Changes...
Starting Load/Save RF Kill Switch Status...
[[0;32m OK [0m] Started Update UTMP about System Runlevel Changes.
[[0;32m OK [0m] Started Load/Save RF Kill Switch Status.
Debian GNU/Linux 9 syzkaller ttyS0
Warning: Permanently added '10.128.0.67' (ECDSA) to the list of known hosts.
executing program
syzkaller login: [ 33.867573] audit: type=1400 audit(1593737333.367:8): avc: denied { execmem } for pid=6333 comm="syz-executor124" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1
[ 33.871331]
[ 33.889577] =============================
[ 33.895608] WARNING: suspicious RCU usage
[ 33.899748] 4.14.184-syzkaller #0 Not tainted
[ 33.905005] -----------------------------
[ 33.909251] net/tipc/bearer.c:177 suspicious rcu_dereference_protected() usage!
[ 33.917947]
[ 33.917947] other info that might help us debug this:
[ 33.917947]
[ 33.928725]
[ 33.928725] rcu_scheduler_active = 2, debug_locks = 1
[ 33.935677] 2 locks held by syz-executor124/6333:
[ 33.940635] #0: (cb_lock){++++}, at: [<ffffffff851db095>] genl_rcv+0x15/0x40
[ 33.948462] #1: (genl_mutex){+.+.}, at: [<ffffffff851dbd02>] genl_rcv_msg+0x112/0x140
[ 33.956792]
[ 33.956792] stack backtrace:
[ 33.961353] CPU: 0 PID: 6333 Comm: syz-executor124 Not tainted 4.14.184-syzkaller #0
[ 33.969221] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 33.978781] Call Trace:
[ 33.981366] dump_stack+0x1b2/0x283
[ 33.985006] tipc_bearer_find+0x1ff/0x2f0
[ 33.989240] tipc_nl_compat_link_set+0x40b/0xb80
[ 33.994237] tipc_nl_compat_doit+0x18d/0x510
[ 33.998724] ? unwind_next_frame+0xe38/0x1700
[ 34.003284] ? tipc_nl_compat_link_stat_dump+0x1b90/0x1b90
[ 34.009074] ? cap_capable+0x1c4/0x230
[ 34.013363] ? security_capable+0x88/0xb0
[ 34.017894] ? ns_capable_common+0x127/0x150
[ 34.022380] tipc_nl_compat_recv+0x95c/0xa10
[ 34.026771] ? tipc_nl_compat_doit+0x510/0x510
[ 34.031348] ? tipc_nl_node_dump+0xc20/0xc20
[ 34.036189] ? __tipc_add_link_prop.isra.0+0x1a0/0x1a0
[ 34.041508] ? lock_acquire+0x170/0x3f0
[ 34.045913] genl_family_rcv_msg+0x57c/0xb30
[ 34.050306] ? lock_is_held_type+0x1f5/0x210
[ 34.054703] ? genl_rcv+0x40/0x40
[ 34.058138] ? __ww_mutex_wakeup_for_backoff+0x210/0x210
[ 34.063700] genl_rcv_msg+0xaf/0x140
[ 34.067400] netlink_rcv_skb+0x127/0x370
[ 34.071524] ? genl_family_rcv_msg+0xb30/0xb30
[ 34.076119] ? netlink_ack+0x970/0x970
[ 34.079991] ? lock_acquire+0x170/0x3f0
[ 34.083981] genl_rcv+0x24/0x40
[ 34.087251] netlink_unicast+0x437/0x610
[ 34.091291] ? netlink_sendskb+0x50/0x50
[ 34.095334] netlink_sendmsg+0x64a/0xbb0
[ 34.099481] ? nlmsg_notify+0x160/0x160
[ 34.103792] ? move_addr_to_kernel.part.0+0xf0/0xf0
[ 34.108991] ? security_socket_sendmsg+0x83/0xb0
[ 34.113963] ? nlmsg_notify+0x160/0x160
[ 34.121562] sock_sendmsg+0xb5/0x100
[ 34.125455] ___sys_sendmsg+0x70a/0x840
[ 34.129422] ? copy_msghdr_from_user+0x380/0x380
[ 34.134621] ? lock_downgrade+0x6e0/0x6e0
[ 34.138760] ? __lock_acquire+0x655/0x42a0
[ 34.143178] ? trace_hardirqs_on+0x10/0x10
[ 34.147414] ? trace_hardirqs_on+0x10/0x10
[ 34.151653] ? rcu_lockdep_current_cpu_online+0xed/0x140
[ 34.157130] ? dentry_free+0xc6/0x120
[ 34.160934] ? rcu_read_lock_sched_held+0x10a/0x130
[ 34.166036] ? kmem_cache_free+0x23a/0x2b0
[ 34.170293] ? mntput_no_expire+0xc7/0x800
[ 34.174509] ? __fget_light+0x16a/0x1f0
[ 34.178671] ? sockfd_lookup_light+0xb2/0x160
[ 34.184497] __sys_sendmsg+0xa3/0x120
[ 34.188530] ? SyS_shutdown+0x160/0x160
[ 34.192575] ? _raw_spin_unlock_irq+0x24/0x90
[ 34.197266] SyS_sendmsg+0x27/0x40
[ 34.201928] ? __sys_sendmsg+0x120/0x120
[ 34.206630] do_syscall_64+0x1d5/0x640
[ 34.210717] entry_SYSCALL_64_after_hwframe+0x46/0xbb
[ 34.215904] RIP: 0033:0x444239
[ 34.2190