[ OK ] Started OpenBSD Secure Shell server. [ OK ] Started Getty on tty2. [ OK ] Started Getty on tty1. [ OK ] Started Serial Getty on ttyS0. [ OK ] Started getty on tty2-tty6 if dbus and logind are not available. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.102' (ECDSA) to the list of known hosts. syzkaller login: [ 60.870603][ T6963] IPVS: ftp: loaded support on port[0] = 21 [ 60.965313][ T6963] chnl_net:caif_netlink_parms(): no params data found [ 61.014959][ T6963] bridge0: port 1(bridge_slave_0) entered blocking state [ 61.022359][ T6963] bridge0: port 1(bridge_slave_0) entered disabled state [ 61.031376][ T6963] device bridge_slave_0 entered promiscuous mode [ 61.041472][ T6963] bridge0: port 2(bridge_slave_1) entered blocking state [ 61.048746][ T6963] bridge0: port 2(bridge_slave_1) entered disabled state [ 61.056347][ T6963] device bridge_slave_1 entered promiscuous mode [ 61.076748][ T6963] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 61.088013][ T6963] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 61.112057][ T6963] team0: Port device team_slave_0 added [ 61.119903][ T6963] team0: Port device team_slave_1 added [ 61.137666][ T6963] batman_adv: batadv0: Adding interface: batadv_slave_0 [ 61.144660][ T6963] 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. [ 61.171698][ T6963] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active [ 61.184260][ T6963] batman_adv: batadv0: Adding interface: batadv_slave_1 [ 61.192422][ T6963] 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. [ 61.218391][ T6963] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active [ 61.282402][ T6963] device hsr_slave_0 entered promiscuous mode [ 61.339799][ T6963] device hsr_slave_1 entered promiscuous mode [ 61.465246][ T6963] netdevsim netdevsim0 netdevsim0: renamed from eth0 [ 61.531129][ T6963] netdevsim netdevsim0 netdevsim1: renamed from eth1 [ 61.570891][ T6963] netdevsim netdevsim0 netdevsim2: renamed from eth2 [ 61.621717][ T6963] netdevsim netdevsim0 netdevsim3: renamed from eth3 [ 61.704885][ T6963] bridge0: port 2(bridge_slave_1) entered blocking state [ 61.712046][ T6963] bridge0: port 2(bridge_slave_1) entered forwarding state [ 61.719857][ T6963] bridge0: port 1(bridge_slave_0) entered blocking state [ 61.726970][ T6963] bridge0: port 1(bridge_slave_0) entered forwarding state [ 61.773022][ T6963] 8021q: adding VLAN 0 to HW filter on device bond0 [ 61.786515][ T2575] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 61.796528][ T2575] bridge0: port 1(bridge_slave_0) entered disabled state [ 61.804815][ T2575] bridge0: port 2(bridge_slave_1) entered disabled state [ 61.813157][ T2575] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 61.825882][ T6963] 8021q: adding VLAN 0 to HW filter on device team0 [ 61.836705][ T2992] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 61.845478][ T2992] bridge0: port 1(bridge_slave_0) entered blocking state [ 61.852574][ T2992] bridge0: port 1(bridge_slave_0) entered forwarding state [ 61.869926][ T2574] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 61.878219][ T2574] bridge0: port 2(bridge_slave_1) entered blocking state [ 61.885308][ T2574] bridge0: port 2(bridge_slave_1) entered forwarding state [ 61.906516][ T6963] hsr0: Slave A (hsr_slave_0) is not up; please bring it up to get a fully working HSR network [ 61.917142][ T6963] hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network [ 61.931167][ T2526] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 61.940513][ T2526] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 61.949076][ T2526] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 61.957577][ T2526] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 61.967711][ T2526] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 61.975541][ T2526] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 61.994224][ T2992] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready [ 62.002342][ T2992] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready [ 62.014572][ T6963] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 62.040475][ T2993] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_virt_wifi: link becomes ready [ 62.049947][ T2993] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 62.067947][ T2526] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_vlan: link becomes ready [ 62.076717][ T2526] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 62.087515][ T6963] device veth0_vlan entered promiscuous mode [ 62.094502][ T2575] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 62.102662][ T2575] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 62.115319][ T6963] device veth1_vlan entered promiscuous mode [ 62.136576][ T2993] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan0: link becomes ready [ 62.145054][ T2993] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan1: link becomes ready [ 62.153671][ T2993] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_macvtap: link becomes ready [ 62.162319][ T2993] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 62.172853][ T6963] device veth0_macvtap entered promiscuous mode [ 62.183977][ T6963] device veth1_macvtap entered promiscuous mode [ 62.201382][ T6963] batman_adv: batadv0: Interface activated: batadv_slave_0 [ 62.209547][ T2575] IPv6: ADDRCONF(NETDEV_CHANGE): macvtap0: link becomes ready [ 62.217444][ T2575] IPv6: ADDRCONF(NETDEV_CHANGE): macsec0: link becomes ready [ 62.226415][ T2575] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_0: link becomes ready [ 62.235499][ T2575] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 62.247668][ T6963] batman_adv: batadv0: Interface activated: batadv_slave_1 [ 62.258117][ T2993] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready [ 62.266949][ T2993] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready executing program [ 65.529397][ C0] ================================================================== [ 65.537604][ C0] BUG: KASAN: use-after-free in ip_icmp_error+0x52a/0x5a0 [ 65.544690][ C0] Read of size 1 at addr ffff8880937207ff by task ksoftirqd/0/9 [ 65.552323][ C0] [ 65.554632][ C0] CPU: 0 PID: 9 Comm: ksoftirqd/0 Not tainted 5.7.0-rc7-next-20200526-syzkaller #0 [ 65.563879][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 65.573905][ C0] Call Trace: [ 65.577173][ C0] dump_stack+0x18f/0x20d [ 65.581480][ C0] ? ip_icmp_error+0x52a/0x5a0 [ 65.586219][ C0] ? ip_icmp_error+0x52a/0x5a0 [ 65.590959][ C0] print_address_description.constprop.0.cold+0xd3/0x413 [ 65.597966][ C0] ? memcpy+0x39/0x60 [ 65.601935][ C0] ? vprintk_func+0x97/0x1a6 [ 65.606528][ C0] ? ip_icmp_error+0x52a/0x5a0 [ 65.611264][ C0] kasan_report.cold+0x1f/0x37 [ 65.616004][ C0] ? skb_clone+0x190/0x3c0 [ 65.620393][ C0] ? ip_icmp_error+0x52a/0x5a0 [ 65.625131][ C0] ip_icmp_error+0x52a/0x5a0 [ 65.629718][ C0] tcp_v4_err+0x99e/0x1ce0 [ 65.634125][ C0] ? tcp_v4_do_rcv+0x8b0/0x8b0 [ 65.638885][ C0] icmp_socket_deliver+0x1e1/0x360 [ 65.643974][ C0] icmp_unreach+0x33b/0xab0 [ 65.648457][ C0] icmp_rcv+0xee6/0x15f0 [ 65.652680][ C0] ip_protocol_deliver_rcu+0x57/0x880 [ 65.658026][ C0] ? check_preemption_disabled+0x38/0x220 [ 65.663721][ C0] ip_local_deliver_finish+0x220/0x360 [ 65.669169][ C0] ip_local_deliver+0x1c8/0x4e0 [ 65.674010][ C0] ? ip_local_deliver_finish+0x360/0x360 [ 65.679621][ C0] ? ip_rcv+0x244/0x3c0 [ 65.683796][ C0] ? ip_protocol_deliver_rcu+0x880/0x880 [ 65.689404][ C0] ? lock_downgrade+0x840/0x840 [ 65.694227][ C0] ? ip_rcv_finish_core.isra.0+0x606/0x1ea0 [ 65.700100][ C0] ip_rcv_finish+0x1da/0x2f0 [ 65.704666][ C0] ip_rcv+0xd0/0x3c0 [ 65.708537][ C0] ? ip_local_deliver+0x4e0/0x4e0 [ 65.713540][ C0] ? ip_rcv_finish_core.isra.0+0x1ea0/0x1ea0 [ 65.719496][ C0] ? ip_local_deliver+0x4e0/0x4e0 [ 65.724535][ C0] __netif_receive_skb_one_core+0x114/0x180 [ 65.730443][ C0] ? __netif_receive_skb_core+0x33f0/0x33f0 [ 65.736314][ C0] ? do_raw_spin_lock+0x120/0x2d0 [ 65.741311][ C0] ? rwlock_bug.part.0+0x90/0x90 [ 65.746223][ C0] __netif_receive_skb+0x27/0x1c0 [ 65.751221][ C0] process_backlog+0x21e/0x7a0 [ 65.755962][ C0] ? lockdep_hardirqs_on_prepare+0x1bc/0x590 [ 65.761916][ C0] net_rx_action+0x4e1/0x10d0 [ 65.766571][ C0] ? napi_busy_loop+0x9e0/0x9e0 [ 65.771436][ C0] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 65.777394][ C0] ? lockdep_hardirqs_on_prepare+0x1bc/0x590 [ 65.783351][ C0] __do_softirq+0x268/0x9ee [ 65.787833][ C0] ? takeover_tasklets+0x810/0x810 [ 65.792918][ C0] run_ksoftirqd+0x89/0x100 [ 65.797394][ C0] smpboot_thread_fn+0x653/0x9e0 [ 65.802305][ C0] ? smpboot_register_percpu_thread+0x370/0x370 [ 65.808528][ C0] ? __kthread_parkme+0x13f/0x1e0 [ 65.813523][ C0] ? smpboot_register_percpu_thread+0x370/0x370 [ 65.819736][ C0] kthread+0x3b5/0x4a0 [ 65.823778][ C0] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 65.829470][ C0] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 65.835162][ C0] ret_from_fork+0x1f/0x30 [ 65.839554][ C0] [ 65.841853][ C0] The buggy address belongs to the page: [ 65.847456][ C0] page:ffffea00024dc800 refcount:0 mapcount:-128 mapping:0000000000000000 index:0xffff888093720000 [ 65.858105][ C0] flags: 0xfffe0000000000() [ 65.862582][ C0] raw: 00fffe0000000000 ffffea00023eba08 ffffea0002496108 0000000000000000 [ 65.871142][ C0] raw: ffff888093720000 0000000000000002 00000000ffffff7f 0000000000000000 [ 65.879692][ C0] page dumped because: kasan: bad access detected [ 65.886070][ C0] [ 65.888369][ C0] Memory state around the buggy address: [ 65.893971][ C0] ffff888093720680: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff [ 65.902003][ C0] ffff888093720700: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff [ 65.910046][ C0] >ffff888093720780: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff [ 65.918081][ C0] ^ [ 65.926065][ C0] ffff888093720800: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff [ 65.934577][ C0] ffff888093720880: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff [ 65.942624][ C0] ================================================================== [ 65.950665][ C0] Disabling lock debugging due to kernel taint [ 65.956854][ C0] Kernel panic - not syncing: panic_on_warn set ... [ 65.963435][ C0] CPU: 0 PID: 9 Comm: ksoftirqd/0 Tainted: G B 5.7.0-rc7-next-20200526-syzkaller #0 [ 65.974091][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 65.984127][ C0] Call Trace: [ 65.987389][ C0] dump_stack+0x18f/0x20d [ 65.991690][ C0] ? ip_icmp_error+0x4f0/0x5a0 [ 65.996424][ C0] panic+0x2e3/0x75c [ 66.000289][ C0] ? __warn_printk+0xf3/0xf3 [ 66.004847][ C0] ? ip_icmp_error+0x52a/0x5a0 [ 66.009581][ C0] ? trace_hardirqs_on+0x55/0x220 [ 66.014573][ C0] ? ip_icmp_error+0x52a/0x5a0 [ 66.019304][ C0] ? ip_icmp_error+0x52a/0x5a0 [ 66.024038][ C0] end_report+0x4d/0x53 [ 66.028162][ C0] kasan_report.cold+0xd/0x37 [ 66.032807][ C0] ? skb_clone+0x190/0x3c0 [ 66.037191][ C0] ? ip_icmp_error+0x52a/0x5a0 [ 66.041926][ C0] ip_icmp_error+0x52a/0x5a0 [ 66.046506][ C0] tcp_v4_err+0x99e/0x1ce0 [ 66.050893][ C0] ? tcp_v4_do_rcv+0x8b0/0x8b0 [ 66.055631][ C0] icmp_socket_deliver+0x1e1/0x360 [ 66.060712][ C0] icmp_unreach+0x33b/0xab0 [ 66.065185][ C0] icmp_rcv+0xee6/0x15f0 [ 66.069399][ C0] ip_protocol_deliver_rcu+0x57/0x880 [ 66.074739][ C0] ? check_preemption_disabled+0x38/0x220 [ 66.080430][ C0] ip_local_deliver_finish+0x220/0x360 [ 66.085857][ C0] ip_local_deliver+0x1c8/0x4e0 [ 66.090678][ C0] ? ip_local_deliver_finish+0x360/0x360 [ 66.096277][ C0] ? ip_rcv+0x244/0x3c0 [ 66.100403][ C0] ? ip_protocol_deliver_rcu+0x880/0x880 [ 66.106004][ C0] ? lock_downgrade+0x840/0x840 [ 66.110823][ C0] ? ip_rcv_finish_core.isra.0+0x606/0x1ea0 [ 66.116702][ C0] ip_rcv_finish+0x1da/0x2f0 [ 66.121262][ C0] ip_rcv+0xd0/0x3c0 [ 66.125127][ C0] ? ip_local_deliver+0x4e0/0x4e0 [ 66.130122][ C0] ? ip_rcv_finish_core.isra.0+0x1ea0/0x1ea0 [ 66.136070][ C0] ? ip_local_deliver+0x4e0/0x4e0 [ 66.141065][ C0] __netif_receive_skb_one_core+0x114/0x180 [ 66.146926][ C0] ? __netif_receive_skb_core+0x33f0/0x33f0 [ 66.152800][ C0] ? do_raw_spin_lock+0x120/0x2d0 [ 66.157801][ C0] ? rwlock_bug.part.0+0x90/0x90 [ 66.162708][ C0] __netif_receive_skb+0x27/0x1c0 [ 66.167699][ C0] process_backlog+0x21e/0x7a0 [ 66.172436][ C0] ? lockdep_hardirqs_on_prepare+0x1bc/0x590 [ 66.178397][ C0] net_rx_action+0x4e1/0x10d0 [ 66.183044][ C0] ? napi_busy_loop+0x9e0/0x9e0 [ 66.187865][ C0] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 66.193823][ C0] ? lockdep_hardirqs_on_prepare+0x1bc/0x590 [ 66.199773][ C0] __do_softirq+0x268/0x9ee [ 66.204254][ C0] ? takeover_tasklets+0x810/0x810 [ 66.209351][ C0] run_ksoftirqd+0x89/0x100 [ 66.213821][ C0] smpboot_thread_fn+0x653/0x9e0 [ 66.218738][ C0] ? smpboot_register_percpu_thread+0x370/0x370 [ 66.224959][ C0] ? __kthread_parkme+0x13f/0x1e0 [ 66.229952][ C0] ? smpboot_register_percpu_thread+0x370/0x370 [ 66.236162][ C0] kthread+0x3b5/0x4a0 [ 66.240201][ C0] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 66.245887][ C0] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 66.251575][ C0] ret_from_fork+0x1f/0x30 [ 66.257335][ C0] Kernel Offset: disabled [ 66.261645][ C0] Rebooting in 86400 seconds..