[ 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 '10.128.0.21' (ECDSA) to the list of known hosts. syzkaller login: [ 68.513787][ T6966] IPVS: ftp: loaded support on port[0] = 21 [ 68.596214][ T6966] chnl_net:caif_netlink_parms(): no params data found [ 68.650593][ T6966] bridge0: port 1(bridge_slave_0) entered blocking state [ 68.658223][ T6966] bridge0: port 1(bridge_slave_0) entered disabled state [ 68.666753][ T6966] device bridge_slave_0 entered promiscuous mode [ 68.676019][ T6966] bridge0: port 2(bridge_slave_1) entered blocking state [ 68.683170][ T6966] bridge0: port 2(bridge_slave_1) entered disabled state [ 68.691437][ T6966] device bridge_slave_1 entered promiscuous mode [ 68.712984][ T6966] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 68.723964][ T6966] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 68.747454][ T6966] team0: Port device team_slave_0 added [ 68.756014][ T6966] team0: Port device team_slave_1 added [ 68.773619][ T6966] batman_adv: batadv0: Adding interface: batadv_slave_0 [ 68.780620][ T6966] 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. [ 68.806563][ T6966] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active [ 68.818973][ T6966] batman_adv: batadv0: Adding interface: batadv_slave_1 [ 68.826022][ T6966] 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. [ 68.852021][ T6966] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active [ 68.918545][ T6966] device hsr_slave_0 entered promiscuous mode [ 68.975380][ T6966] device hsr_slave_1 entered promiscuous mode [ 69.118061][ T6966] netdevsim netdevsim0 netdevsim0: renamed from eth0 [ 69.178263][ T6966] netdevsim netdevsim0 netdevsim1: renamed from eth1 [ 69.238037][ T6966] netdevsim netdevsim0 netdevsim2: renamed from eth2 [ 69.297264][ T6966] netdevsim netdevsim0 netdevsim3: renamed from eth3 [ 69.383759][ T6966] bridge0: port 2(bridge_slave_1) entered blocking state [ 69.390963][ T6966] bridge0: port 2(bridge_slave_1) entered forwarding state [ 69.398962][ T6966] bridge0: port 1(bridge_slave_0) entered blocking state [ 69.406193][ T6966] bridge0: port 1(bridge_slave_0) entered forwarding state [ 69.454544][ T6966] 8021q: adding VLAN 0 to HW filter on device bond0 [ 69.469825][ T2573] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 69.480320][ T2573] bridge0: port 1(bridge_slave_0) entered disabled state [ 69.489052][ T2573] bridge0: port 2(bridge_slave_1) entered disabled state [ 69.497628][ T2573] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 69.511150][ T6966] 8021q: adding VLAN 0 to HW filter on device team0 [ 69.523696][ T2483] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 69.533507][ T2483] bridge0: port 1(bridge_slave_0) entered blocking state [ 69.540656][ T2483] bridge0: port 1(bridge_slave_0) entered forwarding state [ 69.567249][ T2573] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 69.576467][ T2573] bridge0: port 2(bridge_slave_1) entered blocking state [ 69.583532][ T2573] bridge0: port 2(bridge_slave_1) entered forwarding state [ 69.592208][ T2573] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 69.601181][ T2573] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 69.610777][ T2573] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 69.622051][ T2496] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_hsr: link becomes ready [ 69.631627][ T2496] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 69.645174][ T6966] hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network [ 69.656811][ T6966] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 69.666482][ T2483] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_hsr: link becomes ready [ 69.676447][ T2483] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 69.695781][ T2496] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready [ 69.703190][ T2496] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready [ 69.718561][ T6966] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 69.740645][ T2496] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_virt_wifi: link becomes ready [ 69.750510][ T2496] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 69.771025][ T6966] device veth0_vlan entered promiscuous mode [ 69.778967][ T2483] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_vlan: link becomes ready [ 69.788128][ T2483] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 69.798203][ T2483] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 69.807521][ T2483] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 69.820069][ T6966] device veth1_vlan entered promiscuous mode [ 69.841517][ T2573] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan0: link becomes ready [ 69.850210][ T2573] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan1: link becomes ready [ 69.859547][ T2573] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_macvtap: link becomes ready [ 69.869526][ T2573] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 69.880736][ T6966] device veth0_macvtap entered promiscuous mode [ 69.893147][ T6966] device veth1_macvtap entered promiscuous mode [ 69.910993][ T6966] batman_adv: batadv0: Interface activated: batadv_slave_0 [ 69.919739][ T2573] IPv6: ADDRCONF(NETDEV_CHANGE): macvtap0: link becomes ready [ 69.928812][ T2573] IPv6: ADDRCONF(NETDEV_CHANGE): macsec0: link becomes ready [ 69.938157][ T2573] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_0: link becomes ready [ 69.947003][ T2573] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 69.959718][ T6966] batman_adv: batadv0: Interface activated: batadv_slave_1 [ 69.968473][ T2528] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready [ 69.977754][ T2528] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready [ 70.216980][ T34] [ 70.219483][ T34] ============================= [ 70.224306][ T34] WARNING: suspicious RCU usage [ 70.229817][ T34] 5.7.0-syzkaller #0 Not tainted [ 70.234858][ T34] ----------------------------- [ 70.239706][ T34] include/linux/radix-tree.h:176 suspicious rcu_dereference_check() usage! [ 70.248672][ T34] [ 70.248672][ T34] other info that might help us debug this: [ 70.248672][ T34] [ 70.259484][ T34] [ 70.259484][ T34] rcu_scheduler_active = 2, debug_locks = 1 [ 70.267916][ T34] 2 locks held by kworker/u4:3/34: [ 70.273029][ T34] #0: ffff88821b0b0938 ((wq_completion)qrtr_ns_handler){+.+.}-{0:0}, at: process_one_work+0x844/0x16a0 [ 70.286164][ T34] #1: ffffc90000e97dc0 ((work_completion)(&qrtr_ns.work)){+.+.}-{0:0}, at: process_one_work+0x878/0x16a0 [ 70.298475][ T34] [ 70.298475][ T34] stack backtrace: [ 70.304436][ T34] CPU: 0 PID: 34 Comm: kworker/u4:3 Not tainted 5.7.0-syzkaller #0 [ 70.312310][ T34] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 70.322362][ T34] Workqueue: qrtr_ns_handler qrtr_ns_worker [ 70.328239][ T34] Call Trace: [ 70.331517][ T34] dump_stack+0x188/0x20d [ 70.335852][ T34] ctrl_cmd_new_lookup+0x6eb/0x7e0 [ 70.340956][ T34] ? qrtr_recvmsg+0x38a/0x810 [ 70.345620][ T34] ? node_get+0xd0/0xd0 [ 70.349765][ T34] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 70.355290][ T34] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 70.361290][ T34] ? qrtr_node_lookup+0xe0/0xe0 [ 70.366167][ T34] qrtr_ns_worker+0x5a1/0x153a [ 70.370915][ T34] ? ctrl_cmd_del_client.isra.0+0x6c0/0x6c0 [ 70.378186][ T34] ? lock_acquire+0x1f2/0x8f0 [ 70.382843][ T34] ? process_one_work+0x878/0x16a0 [ 70.387945][ T34] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 70.393487][ T34] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 70.399447][ T34] process_one_work+0x965/0x16a0 [ 70.404369][ T34] ? lock_release+0x800/0x800 [ 70.409039][ T34] ? pwq_dec_nr_in_flight+0x310/0x310 [ 70.414410][ T34] ? rwlock_bug.part.0+0x90