[ OK ] Reached target Login Prompts. [ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.216' (ECDSA) to the list of known hosts. 2020/11/09 08:25:28 fuzzer started 2020/11/09 08:25:28 connecting to host at 10.128.0.105:33407 2020/11/09 08:25:28 checking machine... 2020/11/09 08:25:28 checking revisions... 2020/11/09 08:25:28 testing simple program... syzkaller login: [ 30.322434][ T8448] IPVS: ftp: loaded support on port[0] = 21 [ 30.376151][ T8448] chnl_net:caif_netlink_parms(): no params data found [ 30.423089][ T8448] bridge0: port 1(bridge_slave_0) entered blocking state [ 30.431193][ T8448] bridge0: port 1(bridge_slave_0) entered disabled state [ 30.438856][ T8448] device bridge_slave_0 entered promiscuous mode [ 30.446420][ T8448] bridge0: port 2(bridge_slave_1) entered blocking state [ 30.453508][ T8448] bridge0: port 2(bridge_slave_1) entered disabled state [ 30.461039][ T8448] device bridge_slave_1 entered promiscuous mode [ 30.474786][ T8448] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 30.485494][ T8448] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 30.501419][ T8448] team0: Port device team_slave_0 added [ 30.508259][ T8448] team0: Port device team_slave_1 added [ 30.520387][ T8448] batman_adv: batadv0: Adding interface: batadv_slave_0 [ 30.527399][ T8448] 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. [ 30.553360][ T8448] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active [ 30.565140][ T8448] batman_adv: batadv0: Adding interface: batadv_slave_1 [ 30.572073][ T8448] 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. [ 30.598159][ T8448] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active [ 30.618414][ T8448] device hsr_slave_0 entered promiscuous mode [ 30.624906][ T8448] device hsr_slave_1 entered promiscuous mode [ 30.672342][ T8448] netdevsim netdevsim0 netdevsim0: renamed from eth0 [ 30.680696][ T8448] netdevsim netdevsim0 netdevsim1: renamed from eth1 [ 30.689177][ T8448] netdevsim netdevsim0 netdevsim2: renamed from eth2 [ 30.702358][ T8448] netdevsim netdevsim0 netdevsim3: renamed from eth3 [ 30.720235][ T8448] bridge0: port 2(bridge_slave_1) entered blocking state [ 30.727275][ T8448] bridge0: port 2(bridge_slave_1) entered forwarding state [ 30.734537][ T8448] bridge0: port 1(bridge_slave_0) entered blocking state [ 30.741540][ T8448] bridge0: port 1(bridge_slave_0) entered forwarding state [ 30.772825][ T8448] 8021q: adding VLAN 0 to HW filter on device bond0 [ 30.784131][ T3858] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 30.792169][ T3858] bridge0: port 1(bridge_slave_0) entered disabled state [ 30.800697][ T3858] bridge0: port 2(bridge_slave_1) entered disabled state [ 30.808917][ T3858] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 30.818932][ T8448] 8021q: adding VLAN 0 to HW filter on device team0 [ 30.828398][ T4602] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 30.837048][ T4602] bridge0: port 1(bridge_slave_0) entered blocking state [ 30.844086][ T4602] bridge0: port 1(bridge_slave_0) entered forwarding state [ 30.863895][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 30.872196][ T5] bridge0: port 2(bridge_slave_1) entered blocking state [ 30.879245][ T5] bridge0: port 2(bridge_slave_1) entered forwarding state [ 30.887930][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 30.896519][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 30.905127][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 30.914731][ T42] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 30.926397][ T8448] hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network [ 30.937307][ T8448] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 30.945566][ T42] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 30.963306][ T42] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready [ 30.970717][ T42] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready [ 30.979715][ T8448] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 30.995320][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 31.012873][ T8448] device veth0_vlan entered promiscuous mode [ 31.019899][ T4602] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 31.028306][ T4602] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 31.036279][ T4602] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 31.047285][ T8448] device veth1_vlan entered promiscuous mode [ 31.064606][ T4602] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan0: link becomes ready [ 31.072544][ T4602] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan1: link becomes ready [ 31.081019][ T4602] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 31.091274][ T8448] device veth0_macvtap entered promiscuous mode [ 31.100122][ T8448] device veth1_macvtap entered promiscuous mode [ 31.113976][ T8448] batman_adv: batadv0: Interface activated: batadv_slave_0 [ 31.121187][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 31.130372][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): macvtap0: link becomes ready [ 31.140625][ T8448] batman_adv: batadv0: Interface activated: batadv_slave_1 [ 31.148279][ T3858] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready [ 31.158280][ T8448] netdevsim netdevsim0 netdevsim0: set [1, 0] type 2 family 0 port 6081 - 0 [ 31.167227][ T8448] netdevsim netdevsim0 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0 [ 31.175922][ T8448] netdevsim netdevsim0 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0 [ 31.184672][ T8448] netdevsim netdevsim0 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0 [ 31.218573][ T26] wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 [ 31.231391][ T26] wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50 [ 31.245121][ T315] wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 [ 31.253899][ T4602] IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready [ 31.261269][ T315] wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50 [ 31.269947][ T4602] IPv6: ADDRCONF(NETDEV_CHANGE): wlan1: link becomes ready 2020/11/09 08:25:31 building call list... [ 31.421460][ T26] netdevsim netdevsim0 netdevsim3 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0 [ 31.537982][ T26] netdevsim netdevsim0 netdevsim2 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0 [ 31.578878][ T26] netdevsim netdevsim0 netdevsim1 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0 [ 31.645023][ T26] netdevsim netdevsim0 netdevsim0 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0 executing program [ 32.576599][ T26] device hsr_slave_0 left promiscuous mode [ 32.589986][ T26] device hsr_slave_1 left promiscuous mode [ 32.597197][ T26] batman_adv: batadv0: Interface deactivated: batadv_slave_0 [ 32.605080][ T26] batman_adv: batadv0: Removing interface: batadv_slave_0 [ 32.613420][ T26] batman_adv: batadv0: Interface deactivated: batadv_slave_1 [ 32.620778][ T26] batman_adv: batadv0: Removing interface: batadv_slave_1 [ 32.628950][ T26] device bridge_slave_1 left promiscuous mode [ 32.635735][ T26] bridge0: port 2(bridge_slave_1) entered disabled state [ 32.643684][ T26] device bridge_slave_0 left promiscuous mode [ 32.649835][ T26] bridge0: port 1(bridge_slave_0) entered disabled state [ 32.659880][ T26] device veth1_macvtap left promiscuous mode [ 32.666204][ T26] device veth0_macvtap left promiscuous mode [ 32.672188][ T26] device veth1_vlan left promiscuous mode [ 32.678695][ T26] device veth0_vlan left promiscuous mode [ 32.832429][ T11] ================================================================== [ 32.840513][ T11] BUG: KCSAN: data-race in expire_timers / try_to_del_timer_sync [ 32.848195][ T11] [ 32.850497][ T11] write to 0xffff88813bd1bc48 of 8 bytes by interrupt on cpu 1: [ 32.858099][ T11] expire_timers+0x164/0x260 [ 32.862660][ T11] __run_timers+0x328/0x3c0 [ 32.867134][ T11] run_timer_softirq+0x19/0x30 [ 32.871916][ T11] __do_softirq+0x12c/0x2b1 [ 32.876389][ T11] asm_call_irq_on_stack+0xf/0x20 [ 32.881400][ T11] do_softirq_own_stack+0x32/0x40 [ 32.886433][ T11] __local_bh_enable_ip+0xba/0xd0 [ 32.891462][ T11] local_bh_enable+0x1b/0x20 [ 32.896033][ T11] nf_ct_iterate_cleanup+0x2c2/0x360 [ 32.901289][ T11] nf_ct_iterate_cleanup_net+0x77/0xb0 [ 32.906767][ T11] masq_device_event+0x6b/0x80 [ 32.911518][ T11] raw_notifier_call_chain+0x53/0xb0 [ 32.916772][ T11] dev_close_many+0x202/0x310 [ 32.921423][ T11] rollback_registered_many+0x252/0xe40 [ 32.926940][ T11] default_device_exit_batch+0x250/0x3d0 [ 32.932546][ T11] cleanup_net+0x4cc/0x8a0 [ 32.936951][ T11] process_one_work+0x3e1/0x950 [ 32.941806][ T11] worker_thread+0x635/0xb90 [ 32.946366][ T11] kthread+0x1fa/0x220 [ 32.950405][ T11] ret_from_fork+0x1f/0x30 [ 32.954786][ T11] [ 32.957089][ T11] read to 0xffff88813bd1bc48 of 8 bytes by task 11 on cpu 0: [ 32.964428][ T11] try_to_del_timer_sync+0xe3/0x2c0 [ 32.969599][ T11] schedule_timeout+0x108/0x280 [ 32.974416][ T11] rcu_gp_kthread+0x98d/0x1320 [ 32.979236][ T11] kthread+0x1fa/0x220 [ 32.983275][ T11] ret_from_fork+0x1f/0x30 [ 32.987654][ T11] [ 32.989953][ T11] Reported by Kernel Concurrency Sanitizer on: [ 32.996080][ T11] CPU: 0 PID: 11 Comm: rcu_preempt Not tainted 5.10.0-rc3-syzkaller #0 [ 33.004293][ T11] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.014317][ T11] ================================================================== [ 33.022349][ T11] Kernel panic - not syncing: panic_on_warn set ... [ 33.028906][ T11] CPU: 0 PID: 11 Comm: rcu_preempt Not tainted 5.10.0-rc3-syzkaller #0 [ 33.037109][ T11] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.047131][ T11] Call Trace: [ 33.050407][ T11] dump_stack+0x116/0x15d [ 33.054708][ T11] panic+0x1e7/0x5fa [ 33.058575][ T11] ? vprintk_emit+0x2f2/0x370 [ 33.063241][ T11] kcsan_report+0x67b/0x680 [ 33.067717][ T11] ? kcsan_setup_watchpoint+0x46a/0x4d0 [ 33.073247][ T11] ? try_to_del_timer_sync+0xe3/0x2c0 [ 33.078602][ T11] ? schedule_timeout+0x108/0x280 [ 33.083595][ T11] ? rcu_gp_kthread+0x98d/0x1320 [ 33.088518][ T11] ? kthread+0x1fa/0x220 [ 33.092730][ T11] ? ret_from_fork+0x1f/0x30 [ 33.097294][ T11] ? __rcu_read_unlock+0x51/0x220 [ 33.102303][ T11] ? sched_clock+0xf/0x20 [ 33.107384][ T11] kcsan_setup_watchpoint+0x46a/0x4d0 [ 33.112740][ T11] try_to_del_timer_sync+0xe3/0x2c0 [ 33.117908][ T11] schedule_timeout+0x108/0x280 [ 33.122746][ T11] ? run_local_timers+0xb0/0xb0 [ 33.127564][ T11] rcu_gp_kthread+0x98d/0x1320 [ 33.132308][ T11] ? rcu_barrier_callback+0x40/0x40 [ 33.137495][ T11] kthread+0x1fa/0x220 [ 33.141535][ T11] ? rcu_barrier_callback+0x40/0x40 [ 33.146704][ T11] ? kthread_blkcg+0x80/0x80 [ 33.151267][ T11] ret_from_fork+0x1f/0x30 [ 34.232801][ T11] Shutting down cpus with NMI [ 34.238127][ T11] Kernel Offset: disabled [ 34.242433][ T11] Rebooting in 86400 seconds..