[[0;32m OK [0m] Reached target Graphical Interface.
Starting Update UTMP about System Runlevel Changes...
[[0;32m OK [0m] Started Update UTMP about System Runlevel Changes.
Starting Load/Save RF Kill Switch Status...
[[0;32m OK [0m] Started Load/Save RF Kill Switch Status.
Debian GNU/Linux 9 syzkaller ttyS0
Warning: Permanently added '10.128.0.234' (ECDSA) to the list of known hosts.
executing program
syzkaller login: [ 37.935125]
[ 37.937022] =============================
[ 37.941151] WARNING: suspicious RCU usage
[ 37.946921] 4.14.212-syzkaller #0 Not tainted
[ 37.951410] -----------------------------
[ 37.956751] net/sched/act_sample.c:95 suspicious rcu_dereference_protected() usage!
[ 37.964722]
[ 37.964722] other info that might help us debug this:
[ 37.964722]
[ 37.973846]
[ 37.973846] rcu_scheduler_active = 2, debug_locks = 1
[ 37.980758] 1 lock held by syz-executor914/8016:
[ 37.985609] #0: (rtnl_mutex){+.+.}, at: [<ffffffff85e3235d>] rtnetlink_rcv_msg+0x31d/0xb10
[ 37.994313]
[ 37.994313] stack backtrace:
[ 37.999001] CPU: 0 PID: 8016 Comm: syz-executor914 Not tainted 4.14.212-syzkaller #0
[ 38.007052] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 38.016586] Call Trace:
[ 38.019158] dump_stack+0x1b2/0x283
[ 38.022999] tcf_sample_init+0x71c/0x8c0
[ 38.027050] ? tcf_sample_cleanup_rcu+0x60/0x60
[ 38.031723] tcf_action_init_1+0x51a/0x9e0
[ 38.035945] ? tcf_action_dump_old+0x80/0x80
[ 38.040377] ? nla_parse+0x157/0x1f0
[ 38.044268] tcf_action_init+0x26d/0x400
[ 38.048329] ? tcf_action_init_1+0x9e0/0x9e0
[ 38.052728] ? memset+0x20/0x40
[ 38.056018] ? nla_parse+0x157/0x1f0
[ 38.059728] tc_ctl_action+0x2e3/0x50f
[ 38.063617] ? tca_action_gd+0x790/0x790
[ 38.067679] ? rtnetlink_rcv_msg+0x2e8/0xb10
[ 38.072080] ? tca_action_gd+0x790/0x790
[ 38.076136] rtnetlink_rcv_msg+0x3be/0xb10
[ 38.080373] ? rtnl_calcit.isra.0+0x3a0/0x3a0
[ 38.084871] ? __netlink_lookup+0x345/0x5d0
[ 38.089266] netlink_rcv_skb+0x125/0x390
[ 38.093405] ? rtnl_calcit.isra.0+0x3a0/0x3a0
[ 38.097995] ? netlink_ack+0x9a0/0x9a0
[ 38.101893] netlink_unicast+0x437/0x610
[ 38.106077] ? netlink_sendskb+0xd0/0xd0
[ 38.110129] ? __check_object_size+0x179/0x22c
[ 38.114720] netlink_sendmsg+0x62e/0xb80
[ 38.118783] ? nlmsg_notify+0x170/0x170
[ 38.122757] ? kernel_recvmsg+0x210/0x210
[ 38.126903] ? security_socket_sendmsg+0x83/0xb0
[ 38.131673] ? nlmsg_notify+0x170/0x170
[ 38.135650] sock_sendmsg+0xb5/0x100
[ 38.139489] ___sys_sendmsg+0x6c8/0x800
[ 38.143460] ? copy_msghdr_from_user+0x3b0/0x3b0
[ 38.148274] ? lock_downgrade+0x740/0x740
[ 38.152427] ? do_raw_spin_unlock+0x164/0x220
[ 38.156914] ? _raw_spin_unlock+0x29/0x40
[ 38.161061] ? do_huge_pmd_anonymous_page+0x72e/0x1700
[ 38.166432] ? prep_transhuge_page+0xa0/0xa0
[ 38.170843] ? __handle_mm_fault+0x80f/0x4620
[ 38.175335] ? vm_insert_page+0x7c0/0x7c0
[ 38.179471] ? __fdget+0x167/0x1f0
[ 38.183001] ? sockfd_lookup_light+0xb2/0x160
[ 38.187497] __sys_sendmsg+0xa3/0x120
[ 38.191301] ? SyS_shutdown+0x160/0x160
[ 38.195287] ? up_read+0x17/0x30
[ 38.198646] ? __do_page_fault+0x159/0xad0
[ 38.202888] SyS_sendmsg+0x27/0x40
[ 38.206428] ? __sys_sendmsg+0x120/0x120
[ 38.210492] do_syscall_64+0x1d5/0x640
[ 38.214383] entry_SYSCALL_64_after_hwframe+0x46/0xbb
[ 38.219608] RIP: 0033:0x440499
[ 38.222894] RSP: 002b:00007ffe4319c8b8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[ 38.230608] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000