Warning: Permanently added '10.128.0.168' (ECDSA) to the list of known hosts. [ 43.192697] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 43.314359] audit: type=1400 audit(1579778908.482:36): avc: denied { map } for pid=7353 comm="syz-executor256" path="/root/syz-executor256624390" dev="sda1" ino=16483 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 [ 43.317753] [ 43.342659] ============================= [ 43.346782] WARNING: suspicious RCU usage [ 43.351014] 4.14.167-syzkaller #0 Not tainted [ 43.355510] ----------------------------- [ 43.359648] net/sched/act_sample.c:95 suspicious rcu_dereference_protected() usage! [ 43.367666] [ 43.367666] other info that might help us debug this: [ 43.367666] [ 43.376390] [ 43.376390] rcu_scheduler_active = 2, debug_locks = 1 [ 43.383615] 1 lock held by syz-executor256/7353: [ 43.388366] #0: (rtnl_mutex){+.+.}, at: [] rtnetlink_rcv_msg+0x339/0xb70 [ 43.397022] [ 43.397022] stack backtrace: [ 43.401583] CPU: 1 PID: 7353 Comm: syz-executor256 Not tainted 4.14.167-syzkaller #0 [ 43.409558] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 43.419868] Call Trace: [ 43.422470] dump_stack+0x142/0x197 [ 43.426090] lockdep_rcu_suspicious+0x153/0x15d [ 43.430848] tcf_sample_init+0x783/0x960 [ 43.434908] ? tcf_sample_act+0x9f0/0x9f0 [ 43.439100] ? rcu_read_lock_sched_held+0x110/0x130 [ 43.445341] ? _raw_read_unlock+0x2d/0x50 [ 43.449537] tcf_action_init_1+0x53c/0xaa0 [ 43.453822] ? tcf_action_dump_old+0x80/0x80 [ 43.458265] ? lock_downgrade+0x740/0x740 [ 43.462478] ? nla_parse+0x186/0x240 [ 43.466197] tcf_action_init+0x2ab/0x480 [ 43.470344] ? tcf_action_init_1+0xaa0/0xaa0 [ 43.474889] ? memset+0x32/0x40 [ 43.478154] ? nla_parse+0x186/0x240 [ 43.482110] tc_ctl_action+0x30a/0x548 [ 43.486000] ? tca_action_gd+0x840/0x840 [ 43.490065] ? tca_action_gd+0x840/0x840 [ 43.494131] rtnetlink_rcv_msg+0x3da/0xb70 [ 43.498371] ? rtnl_bridge_getlink+0x7a0/0x7a0 [ 43.502957] ? netlink_deliver_tap+0x93/0x8f0 [ 43.507457] netlink_rcv_skb+0x14f/0x3c0 [ 43.511524] ? rtnl_bridge_getlink+0x7a0/0x7a0 [ 43.516109] ? lock_downgrade+0x740/0x740 [ 43.520253] ? netlink_ack+0x9a0/0x9a0 [ 43.524201] ? netlink_deliver_tap+0xba/0x8f0 [ 43.528698] rtnetlink_rcv+0x1d/0x30 [ 43.532541] netlink_unicast+0x44d/0x650 [ 43.536857] ? netlink_attachskb+0x6a0/0x6a0 [ 43.541272] ? security_netlink_send+0x81/0xb0 [ 43.545856] netlink_sendmsg+0x7c4/0xc60 [ 43.550730] ? netlink_unicast+0x650/0x650 [ 43.554953] ? security_socket_sendmsg+0x89/0xb0 [ 43.559709] ? netlink_unicast+0x650/0x650 [ 43.564071] sock_sendmsg+0xce/0x110 [ 43.567791] ___sys_sendmsg+0x70a/0x840 [ 43.571794] ? lock_downgrade+0x740/0x740 [ 43.575978] ? copy_msghdr_from_user+0x3f0/0x3f0 [ 43.580726] ? do_raw_spin_unlock+0x174/0x260 [ 43.585220] ? _raw_spin_unlock+0x2d/0x50 [ 43.589444] ? do_huge_pmd_anonymous_page+0x2f9/0x1200 [ 43.594743] ? prep_transhuge_page+0xa0/0xa0 [ 43.599271] ? __handle_mm_fault+0x692/0x33d0 [ 43.603964] ? save_trace+0x290/0x290 [ 43.607887] ? copy_page_range+0x1de0/0x1de0 [ 43.612314] ? __do_page_fault+0x4e9/0xb80 [ 43.616610] ? __fget_light+0x172/0x1f0 [ 43.620706] ? __fdget+0x1b/0x20 [ 43.624074] ? sockfd_lookup_light+0xb4/0x160 [ 43.628626] __sys_sendmsg+0xb9/0x140 [ 43.632550] ? SyS_shutdown+0x170/0x170 [ 43.636525] SyS_sendmsg+0x2d/0x50 [ 43.640063] ? __sys_sendmsg+0x140/0x140 [ 43.644228] do_syscall_64+0x1e8/0x640 [ 43.648110] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 43.652958] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 43.658151] RIP: 0033:0x440369 [ 43.661334] RSP: 002b:00007ffe3006b268 EFLAGS: 0000