[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.1.59' (ECDSA) to the list of known hosts. syzkaller login: [ 75.136326][ T8418] chnl_net:caif_netlink_parms(): no params data found [ 75.200273][ T8418] bridge0: port 1(bridge_slave_0) entered blocking state [ 75.208777][ T8418] bridge0: port 1(bridge_slave_0) entered disabled state [ 75.218135][ T8418] device bridge_slave_0 entered promiscuous mode [ 75.228473][ T8418] bridge0: port 2(bridge_slave_1) entered blocking state [ 75.236384][ T8418] bridge0: port 2(bridge_slave_1) entered disabled state [ 75.245674][ T8418] device bridge_slave_1 entered promiscuous mode [ 75.266579][ T8418] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 75.277676][ T8418] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 75.298097][ T8418] team0: Port device team_slave_0 added [ 75.305130][ T8418] team0: Port device team_slave_1 added [ 75.321238][ T8418] batman_adv: batadv0: Adding interface: batadv_slave_0 [ 75.328181][ T8418] batman_adv: batadv0: The MTU of interface batadv_slave_0 is too small (1500) to handle the transport of batman-adv packets. Packets going over this interface will be fragmented on layer2 which could impact the performance. Setting the MTU to 1560 would solve the problem. [ 75.355184][ T8418] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active [ 75.368351][ T8418] batman_adv: batadv0: Adding interface: batadv_slave_1 [ 75.375624][ T8418] batman_adv: batadv0: The MTU of interface batadv_slave_1 is too small (1500) to handle the transport of batman-adv packets. Packets going over this interface will be fragmented on layer2 which could impact the performance. Setting the MTU to 1560 would solve the problem. [ 75.401647][ T8418] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active [ 75.427610][ T8418] device hsr_slave_0 entered promiscuous mode [ 75.434416][ T8418] device hsr_slave_1 entered promiscuous mode [ 75.537266][ T8418] netdevsim netdevsim0 netdevsim0: renamed from eth0 [ 75.546973][ T8418] netdevsim netdevsim0 netdevsim1: renamed from eth1 [ 75.557412][ T8418] netdevsim netdevsim0 netdevsim2: renamed from eth2 [ 75.566956][ T8418] netdevsim netdevsim0 netdevsim3: renamed from eth3 [ 75.592539][ T8418] bridge0: port 2(bridge_slave_1) entered blocking state [ 75.599824][ T8418] bridge0: port 2(bridge_slave_1) entered forwarding state [ 75.607611][ T8418] bridge0: port 1(bridge_slave_0) entered blocking state [ 75.614857][ T8418] bridge0: port 1(bridge_slave_0) entered forwarding state [ 75.655135][ T8418] 8021q: adding VLAN 0 to HW filter on device bond0 [ 75.669166][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 75.680747][ T5] bridge0: port 1(bridge_slave_0) entered disabled state [ 75.689590][ T5] bridge0: port 2(bridge_slave_1) entered disabled state [ 75.698872][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 75.713187][ T8418] 8021q: adding VLAN 0 to HW filter on device team0 [ 75.724458][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 75.733197][ T5] bridge0: port 1(bridge_slave_0) entered blocking state [ 75.740437][ T5] bridge0: port 1(bridge_slave_0) entered forwarding state [ 75.763830][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 75.773131][ T5] bridge0: port 2(bridge_slave_1) entered blocking state [ 75.780552][ T5] bridge0: port 2(bridge_slave_1) entered forwarding state [ 75.789762][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 75.807157][ T8418] hsr0: Slave A (hsr_slave_0) is not up; please bring it up to get a fully working HSR network [ 75.820051][ T8418] hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network [ 75.833924][ T8627] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 75.842327][ T8627] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 75.850579][ T8627] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 75.859505][ T8627] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 75.868954][ T8627] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 75.886983][ T3356] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready [ 75.895786][ T3356] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready [ 75.909837][ T8418] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 75.928531][ T3356] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 75.948178][ T8627] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 75.957114][ T8627] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 75.966223][ T8627] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 75.976157][ T8418] device veth0_vlan entered promiscuous mode [ 75.989351][ T8418] device veth1_vlan entered promiscuous mode [ 76.009597][ T8627] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan0: link becomes ready [ 76.018318][ T8627] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan1: link becomes ready [ 76.027190][ T8627] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 76.038301][ T8418] device veth0_macvtap entered promiscuous mode [ 76.050599][ T8418] device veth1_macvtap entered promiscuous mode [ 76.066661][ T8418] batman_adv: batadv0: Interface activated: batadv_slave_0 [ 76.075399][ T8627] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 76.085640][ T8627] IPv6: ADDRCONF(NETDEV_CHANGE): macvtap0: link becomes ready [ 76.099069][ T8418] batman_adv: batadv0: Interface activated: batadv_slave_1 [ 76.107021][ T3356] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready executing program [ 76.118810][ T8418] netdevsim netdevsim0 netdevsim0: set [1, 0] type 2 family 0 port 6081 - 0 [ 76.128543][ T8418] netdevsim netdevsim0 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0 [ 76.138958][ T8418] netdevsim netdevsim0 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0 [ 76.147984][ T8418] netdevsim netdevsim0 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0 [ 76.245290][ T8631] netlink: 12 bytes leftover after parsing attributes in process `syz-executor040'. [ 76.255476][ T8631] netlink: 'syz-executor040': attribute type 11 has an invalid length. [ 76.269308][ T8631] netdevsim netdevsim0 netdevsim0: set [0, 0] type 1 family 0 port 8472 - 0 [ 76.278823][ T8631] netdevsim netdevsim0 netdevsim1: set [0, 0] type 1 family 0 port 8472 - 0 [ 76.287681][ T8631] netdevsim netdevsim0 netdevsim2: set [0, 0] type 1 family 0 port 8472 - 0 [ 76.296677][ T8631] netdevsim netdevsim0 netdevsim3: set [0, 0] type 1 family 0 port 8472 - 0 [ 76.308982][ T8634] netlink: 16 bytes leftover after parsing attributes in process `syz-executor040'. [ 77.281577][ T5] [ 77.284022][ T5] ============================= [ 77.288847][ T5] WARNING: suspicious RCU usage [ 77.293773][ T5] 5.13.0-rc6-syzkaller #0 Not tainted [ 77.299233][ T5] ----------------------------- [ 77.304128][ T5] include/net/addrconf.h:313 suspicious rcu_dereference_check() usage! [ 77.312435][ T5] [ 77.312435][ T5] other info that might help us debug this: [ 77.312435][ T5] [ 77.322730][ T5] [ 77.322730][ T5] rcu_scheduler_active = 2, debug_locks = 1 [ 77.330881][ T5] 3 locks held by kworker/0:0/5: [ 77.335810][ T5] #0: ffff888011064d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x871/0x1600 [ 77.346442][ T5] #1: ffffc90000ca7da8 ((work_completion)(&port->wq)){+.+.}-{0:0}, at: process_one_work+0x8a5/0x1600 [ 77.357513][ T5] #2: ffffffff8bf795c0 (rcu_read_lock_bh){....}-{1:2}, at: __dev_queue_xmit+0x1da/0x3130 [ 77.367525][ T5] [ 77.367525][ T5] stack backtrace: [ 77.373481][ T5] CPU: 0 PID: 5 Comm: kworker/0:0 Not tainted 5.13.0-rc6-syzkaller #0 [ 77.381715][ T5] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 77.391867][ T5] Workqueue: events ipvlan_process_multicast [ 77.397932][ T5] Call Trace: [ 77.401284][ T5] dump_stack+0x141/0x1d7 [ 77.405635][ T5] vxlan_xmit+0x34d5/0x4c30 [ 77.410276][ T5] ? __lock_acquire+0xb3a/0x5230 [ 77.415234][ T5] ? vxlan_xmit_one+0x2e80/0x2e80 [ 77.420363][ T5] ? __sanitizer_cov_trace_switch+0x63/0xf0 [ 77.426254][ T5] ? skb_network_protocol+0x148/0x580 [ 77.431641][ T5] ? skb_crc32c_csum_help+0x70/0x70 [ 77.436846][ T5] ? dev_hard_start_xmit+0x66a/0x920 [ 77.442129][ T5] dev_hard_start_xmit+0x1eb/0x920 [ 77.447233][ T5] __dev_queue_xmit+0x2133/0x3130 [ 77.452247][ T5] ? netdev_core_pick_tx+0x2e0/0x2e0 [ 77.457683][ T5] ? ipvlan_process_multicast+0x8a5/0xd70 [ 77.463399][ T5] ? lock_downgrade+0x6e0/0x6e0 [ 77.468252][ T5] ? mark_held_locks+0x9f/0xe0 [ 77.473021][ T5] ? __local_bh_enable_ip+0xa0/0x120 [ 77.478299][ T5] ipvlan_process_multicast+0xa99/0xd70 [ 77.483855][ T5] ? ipvlan_mac_hash+0xd0/0xd0 [ 77.488977][ T5] ? lock_downgrade+0x6e0/0x6e0 [ 77.493922][ T5] ? do_raw_spin_lock+0x120/0x2b0 [ 77.498939][ T5] process_one_work+0x98d/0x1600 [ 77.503871][ T5] ? pwq_dec_nr_in_flight+0x320/0x320 [ 77.509409][ T5] ? rwlock_bug.part.0+0x90/0x90 [ 77.514323][ T5] ? _raw_spin_lock_irq+0x41/0x50 [ 77.519334][ T5] worker_thread+0x64c/0x1120 [ 77.524001][ T5] ? process_one_work+0x1600/0x1600 [ 77.529210][ T5] kthread+0x3b1/0x4a0 [ 77.533264][ T5] ? __kthread_bind_mask+0xc0/0xc0 [ 77.538449][ T5] ret_from_fork+0x1f/0x30