[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c.
[ 63.713789][ T27] audit: type=1800 audit(1581649117.728:25): pid=8935 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0
[ 63.740941][ T27] audit: type=1800 audit(1581649117.728:26): pid=8935 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0
[ 63.784857][ T27] audit: type=1800 audit(1581649117.728:27): pid=8935 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0
[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c.
Debian GNU/Linux 7 syzkaller ttyS0
Warning: Permanently added '10.128.0.63' (ECDSA) to the list of known hosts.
syzkaller login: [ 77.168453][ T9089] IPVS: ftp: loaded support on port[0] = 21
[ 77.219010][ T9089] chnl_net:caif_netlink_parms(): no params data found
[ 77.253621][ T9089] bridge0: port 1(bridge_slave_0) entered blocking state
[ 77.261070][ T9089] bridge0: port 1(bridge_slave_0) entered disabled state
[ 77.268996][ T9089] device bridge_slave_0 entered promiscuous mode
[ 77.277734][ T9089] bridge0: port 2(bridge_slave_1) entered blocking state
[ 77.285083][ T9089] bridge0: port 2(bridge_slave_1) entered disabled state
[ 77.292836][ T9089] device bridge_slave_1 entered promiscuous mode
[ 77.308320][ T9089] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link
[ 77.319601][ T9089] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link
[ 77.338403][ T9089] team0: Port device team_slave_0 added
[ 77.346184][ T9089] team0: Port device team_slave_1 added
[ 77.359592][ T9089] batman_adv: batadv0: Adding interface: batadv_slave_0
[ 77.367323][ T9089] 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.
[ 77.394211][ T9089] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active
[ 77.406791][ T9089] batman_adv: batadv0: Adding interface: batadv_slave_1
[ 77.413966][ T9089] 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.
[ 77.440084][ T9089] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active
[ 77.482709][ T9089] device hsr_slave_0 entered promiscuous mode
[ 77.561221][ T9089] device hsr_slave_1 entered promiscuous mode
[ 77.684370][ T9089] netdevsim netdevsim0 netdevsim0: renamed from eth0
[ 77.743471][ T9089] netdevsim netdevsim0 netdevsim1: renamed from eth1
[ 77.803121][ T9089] netdevsim netdevsim0 netdevsim2: renamed from eth2
[ 77.863228][ T9089] netdevsim netdevsim0 netdevsim3: renamed from eth3
[ 77.913977][ T9089] bridge0: port 2(bridge_slave_1) entered blocking state
[ 77.921336][ T9089] bridge0: port 2(bridge_slave_1) entered forwarding state
[ 77.929009][ T9089] bridge0: port 1(bridge_slave_0) entered blocking state
[ 77.936137][ T9089] bridge0: port 1(bridge_slave_0) entered forwarding state
[ 77.973879][ T9089] 8021q: adding VLAN 0 to HW filter on device bond0
[ 77.987867][ T2738] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready
[ 77.998469][ T2738] bridge0: port 1(bridge_slave_0) entered disabled state
[ 78.006681][ T2738] bridge0: port 2(bridge_slave_1) entered disabled state
[ 78.015174][ T2738] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready
[ 78.028081][ T9089] 8021q: adding VLAN 0 to HW filter on device team0
[ 78.038717][ T2800] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready
[ 78.047877][ T2800] bridge0: port 1(bridge_slave_0) entered blocking state
[ 78.055127][ T2800] bridge0: port 1(bridge_slave_0) entered forwarding state
[ 78.066130][ T2738] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready
[ 78.074987][ T2738] bridge0: port 2(bridge_slave_1) entered blocking state
[ 78.082219][ T2738] bridge0: port 2(bridge_slave_1) entered forwarding state
[ 78.102131][ T2738] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready
[ 78.111959][ T2738] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready
[ 78.123082][ T26] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready
[ 78.131492][ T26] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready
[ 78.144229][ T2800] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready
[ 78.154718][ T9089] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready
[ 78.172033][ T26] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready
[ 78.179654][ T26] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready
[ 78.192982][ T9089] 8021q: adding VLAN 0 to HW filter on device batadv0
[ 78.210266][ T2800] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready
[ 78.230167][ T9089] device veth0_vlan entered promiscuous mode
[ 78.237046][ T3011] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_vlan: link becomes ready
[ 78.246926][ T3011] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready
[ 78.257057][ T3011] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready
[ 78.265258][ T3011] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready
[ 78.275911][ T9089] device veth1_vlan entered promiscuous mode
[ 78.294466][ T26] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan0: link becomes ready
[ 78.303453][ T26] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan1: link becomes ready
[ 78.312027][ T26] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_macvtap: link becomes ready
[ 78.320377][ T26] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready
[ 78.333074][ T9089] device veth0_macvtap entered promiscuous mode
[ 78.343645][ T9089] device veth1_macvtap entered promiscuous mode
[ 78.358118][ T9089] batman_adv: batadv0: Interface activated: batadv_slave_0
[ 78.365789][ T3011] IPv6: ADDRCONF(NETDEV_CHANGE): macvtap0: link becomes ready
[ 78.374769][ T3011] IPv6: ADDRCONF(NETDEV_CHANGE): macsec0: link becomes ready
[ 78.382783][ T3011] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_0: link becomes ready
[ 78.391667][ T3011] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready
[ 78.403231][ T9089] batman_adv: batadv0: Interface activated: batadv_slave_1
[ 78.411258][ T2690] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready
[ 78.419777][ T2690] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready
executing program
[ 78.711423][ C1] ==================================================================
[ 78.719797][ C1] BUG: KASAN: use-after-free in l3mdev_master_ifindex_rcu+0xfa/0x130
[ 78.727950][ C1] Read of size 4 at addr ffff888097c7821c by task kworker/1:4/2690
[ 78.735985][ C1]
[ 78.738304][ C1] CPU: 1 PID: 2690 Comm: kworker/1:4 Not tainted 5.6.0-rc1-syzkaller #0
[ 78.746608][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 78.756667][ C1] Workqueue: events iterate_cleanup_work
[ 78.762292][ C1] Call Trace:
[ 78.765568][ C1]
[ 78.768426][ C1] dump_stack+0x1fb/0x318
[ 78.772741][ C1] print_address_description+0x74/0x5c0
[ 78.778297][ C1] ? vprintk_default+0x28/0x30
[ 78.783064][ C1] ? vprintk_func+0x158/0x170
[ 78.787748][ C1] ? printk+0x62/0x8d
[ 78.791896][ C1] __kasan_report+0x149/0x1c0
[ 78.796575][ C1] ? l3mdev_master_ifindex_rcu+0xfa/0x130
[ 78.802280][ C1] kasan_report+0x26/0x50
[ 78.806598][ C1] ? __ipv6_dev_get_saddr+0x41f/0x440
[ 78.811960][ C1] __asan_report_load4_noabort+0x14/0x20
[ 78.817607][ C1] l3mdev_master_ifindex_rcu+0xfa/0x130
[ 78.823225][ C1] ipv6_dev_get_saddr+0x229/0x9f0
[ 78.828300][ C1] ? __kasan_check_read+0x11/0x20
[ 78.833318][ C1] ip6_dst_lookup_tail+0xe52/0x12b0
[ 78.838525][ C1] ip6_dst_lookup_flow+0x6e/0x110
[ 78.843806][ C1] ? ip6_dst_lookup_tail+0x12b0/0x12b0
[ 78.849376][ C1] geneve_get_v6_dst+0x459/0x660
[ 78.854308][ C1] geneve_xmit+0x71f/0x1f70
[ 78.858823][ C1] dev_hard_start_xmit+0x1b1/0x3f0
[ 78.864109][ C1] __dev_queue_xmit+0x1e1f/0x2e70
[ 78.869130][ C1] ? ip6_finish_output2+0xcb5/0x13e0
[ 78.874424][ C1] ? ip6_finish_output2+0xde9/0x13e0
[ 78.879720][ C1] dev_queue_xmit+0x17/0x20
[ 78.884227][ C1] ip6_finish_output2+0x101d/0x13e0
[ 78.889464][ C1] __ip6_finish_output+0x693/0x8c0
[ 78.894576][ C1] ip6_finish_output+0x52/0x1e0
[ 78.899437][ C1] ? ip6_output+0x2ad/0x3c0
[ 78.903932][ C1] ip6_output+0x2c2/0x3c0
[ 78.908260][ C1] mld_sendpack+0x770/0xb80
[ 78.913017][ C1] mld_ifc_timer_expire+0x85b/0xc60
[ 78.918653][ C1] ? rcu_read_lock_sched_held+0x10b/0x170
[ 78.924374][ C1] ? mld_gq_timer_expire+0xe0/0xe0
[ 78.929486][ C1] call_timer_fn+0x95/0x170
[ 78.933989][ C1] ? mld_gq_timer_expire+0xe0/0xe0
[ 78.939099][ C1] __run_timers+0x776/0x970
[ 78.943665][ C1] ? check_preemption_disabled+0x44/0x260
[ 78.949519][ C1] ? debug_smp_processor_id+0x9/0x20
[ 78.954804][ C1] run_timer_softirq+0x4a/0x90
[ 78.959557][ C1] __do_softirq+0x283/0x7bd
[ 78.964043][ C1] ? do_softirq_own_stack+0x2a/0x40
[ 78.969241][ C1] do_softirq_own_stack+0x2a/0x40
[ 78.974290][ C1]
[ 78.977225][ C1] do_softirq+0xfd/0x190
[ 78.981475][ C1] ? local_bh_enable+0x9/0x30
[ 78.986146][ C1] __local_bh_enable_ip+0x194/0x240
[ 78.991343][ C1] local_bh_enable+0x1f/0x30
[ 78.996024][ C1] nf_ct_iterate_cleanup+0x2fa/0x3a0
[ 79.001332][ C1] ? nf_ct_iterate_cleanup+0x3a0/0x3a0
[ 79.006919][ C1] ? iterate_cleanup_work+0x100/0x100
[ 79.012413][ C1] nf_ct_iterate_cleanup_net+0xf9/0x150
[ 79.017969][ C1] ? iterate_cleanup_work+0x100/0x100
[ 79.023351][ C1] iterate_cleanup_work+0x4f/0x100
[ 79.028482][ C1] process_one_work+0x7f5/0x10f0
[ 79.033538][ C1] worker_thread+0xbbc/0x1630
[ 79.038232][ C1] kthread+0x332/0x350
[ 79.042446][ C1] ? rcu_lock_release+0x30/0x30
[ 79.047310][ C1] ? kthread_blkcg+0xe0/0xe0
[ 79.051914][ C1] ret_from_fork+0x24/0x30
[ 79.056394][ C1]
[ 79.058852][ C1] Allocated by task 9089:
[ 79.063181][ C1] __kasan_kmalloc+0x118/0x1c0
[ 79.067954][ C1] kasan_kmalloc+0x9/0x10
[ 79.072265][ C1] __kmalloc_node+0x4d/0x60
[ 79.076836][ C1] kvmalloc_node+0x85/0x110
[ 79.081365][ C1] alloc_netdev_mqs+0x8e/0xd40
[ 79.086128][ C1] rtnl_create_link+0x238/0x940
[ 79.090972][ C1] rtnl_newlink+0x12a2/0x1c00
[ 79.095724][ C1] rtnetlink_rcv_msg+0x889/0xd40
[ 79.100656][ C1] netlink_rcv_skb+0x19e/0x3e0
[ 79.105418][ C1] rtnetlink_rcv+0x1c/0x20
[ 79.109818][ C1] netlink_unicast+0x766/0x920
[ 79.114567][ C1] netlink_sendmsg+0xa2b/0xd40
[ 79.119327][ C1] __sys_sendto+0x43c/0x5e0
[ 79.123976][ C1] __x64_sys_sendto+0xe5/0x100
[ 79.128775][ C1] do_syscall_64+0xf7/0x1c0
[ 79.133288][ C1] entry_SYSCALL_64_after_hwframe+0x49/0xbe
[ 79.139179][ C1]
[ 79.141501][ C1] Freed by task 9089:
[ 79.145508][ C1] __kasan_slab_free+0x12e/0x1e0
[ 79.150433][ C1] kasan_slab_free+0xe/0x10
[ 79.154972][ C1] kfree+0x10d/0x220
[ 79.158959][ C1] netdev_name_node_alt_destroy+0x35c/0x380
[ 79.164841][ C1] rtnl_linkprop+0x42d/0x680
[ 79.169466][ C1] rtnl_dellinkprop+0x2a/0x40
[ 79.174133][ C1] rtnetlink_rcv_msg+0x889/0xd40
[ 79.179052][ C1] netlink_rcv_skb+0x19e/0x3e0
[ 79.183802][ C1] rtnetlink_rcv+0x1c/0x20
[ 79.188206][ C1] netlink_unicast+0x766/0x920
[ 79.193063][ C1] netlink_sendmsg+0xa2b/0xd40
[ 79.198053][ C1] ____sys_sendmsg+0x4f7/0x7f0
[ 79.202805][ C1] __sys_sendmsg+0x1ed/0x290
[ 79.207496][ C1] __x64_sys_sendmsg+0x7f/0x90
[ 79.212247][ C1] do_syscall_64+0xf7/0x1c0
[ 79.216748][ C1] entry_SYSCALL_64_after_hwframe+0x49/0xbe
[ 79.222622][ C1]
[ 79.224944][ C1] The buggy address belongs to the object at ffff888097c78000
[ 79.224944][ C1] which belongs to the cache kmalloc-4k of size 4096
[ 79.239479][ C1] The buggy address is located 540 bytes inside of
[ 79.239479][ C1] 4096-byte region [ffff888097c78000, ffff888097c79000)
[ 79.252895][ C1] The buggy address belongs to the page:
[ 79.258743][ C1] page:ffffea00025f1e00 refcount:1 mapcount:0 mapping:ffff8880aa402000 index:0x0 compound_mapcount: 0
[ 79.270099][ C1] flags: 0xfffe0000010200(slab|head)
[ 79.275397][ C1] raw: 00fffe0000010200 ffffea00023a5e88 ffffea00020f9808 ffff8880aa402000
[ 79.284122][ C1] raw: 0000000000000000 ffff888097c78000 0000000100000001 0000000000000000
[ 79.292690][ C1] page dumped because: kasan: bad access detected
[ 79.299091][ C1]
[ 79.301413][ C1] Memory state around the buggy address:
[ 79.307168][ C1] ffff888097c78100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 79.315222][ C1] ffff888097c78180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 79.323381][ C1] >ffff888097c78200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 79.331438][ C1] ^
[ 79.336391][ C1] ffff888097c78280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 79.344746][ C1] ffff888097c78300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 79.352909][ C1] ==================================================================
[ 79.360966][ C1] Disabling lock debugging due to kernel taint
[ 79.367163][ C1] Kernel panic - not syncing: panic_on_warn set ...
[ 79.373964][ C1] CPU: 1 PID: 2690 Comm: kworker/1:4 Tainted: G B 5.6.0-rc1-syzkaller #0
[ 79.383657][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 79.393860][ C1] Workqueue: events iterate_cleanup_work
[ 79.399850][ C1] Call Trace:
[ 79.403130][ C1]
[ 79.405973][ C1] dump_stack+0x1fb/0x318
[ 79.410412][ C1] panic+0x264/0x7a9
[ 79.414418][ C1] ? __kasan_report+0x193/0x1c0
[ 79.419259][ C1] ? trace_hardirqs_on+0x34/0x80
[ 79.424186][ C1] ? _raw_spin_unlock_irqrestore+0xa8/0xe0
[ 79.430122][ C1] __kasan_report+0x1b9/0x1c0
[ 79.434800][ C1] ? l3mdev_master_ifindex_rcu+0xfa/0x130
[ 79.440742][ C1] kasan_report+0x26/0x50
[ 79.445063][ C1] ? __ipv6_dev_get_saddr+0x41f/0x440
[ 79.450425][ C1] __asan_report_load4_noabort+0x14/0x20
[ 79.456194][ C1] l3mdev_master_ifindex_rcu+0xfa/0x130
[ 79.461731][ C1] ipv6_dev_get_saddr+0x229/0x9f0
[ 79.466742][ C1] ? __kasan_check_read+0x11/0x20
[ 79.471756][ C1] ip6_dst_lookup_tail+0xe52/0x12b0
[ 79.477003][ C1] ip6_dst_lookup_flow+0x6e/0x110
[ 79.482212][ C1] ? ip6_dst_lookup_tail+0x12b0/0x12b0
[ 79.488204][ C1] geneve_get_v6_dst+0x459/0x660
[ 79.493133][ C1] geneve_xmit+0x71f/0x1f70
[ 79.497824][ C1] dev_hard_start_xmit+0x1b1/0x3f0
[ 79.502971][ C1] __dev_queue_xmit+0x1e1f/0x2e70
[ 79.507994][ C1] ? ip6_finish_output2+0xcb5/0x13e0
[ 79.513343][ C1] ? ip6_finish_output2+0xde9/0x13e0
[ 79.518624][ C1] dev_queue_xmit+0x17/0x20
[ 79.523130][ C1] ip6_finish_output2+0x101d/0x13e0
[ 79.528385][ C1] __ip6_finish_output+0x693/0x8c0
[ 79.533601][ C1] ip6_finish_output+0x52/0x1e0
[ 79.538479][ C1] ? ip6_output+0x2ad/0x3c0
[ 79.543042][ C1] ip6_output+0x2c2/0x3c0
[ 79.547453][ C1] mld_sendpack+0x770/0xb80
[ 79.552495][ C1] mld_ifc_timer_expire+0x85b/0xc60
[ 79.557754][ C1] ? rcu_read_lock_sched_held+0x10b/0x170
[ 79.563836][ C1] ? mld_gq_timer_expire+0xe0/0xe0
[ 79.568941][ C1] call_timer_fn+0x95/0x170
[ 79.573429][ C1] ? mld_gq_timer_expire+0xe0/0xe0
[ 79.578532][ C1] __run_timers+0x776/0x970
[ 79.583125][ C1] ? check_preemption_disabled+0x44/0x260
[ 79.589030][ C1] ? debug_smp_processor_id+0x9/0x20
[ 79.594576][ C1] run_timer_softirq+0x4a/0x90
[ 79.599418][ C1] __do_softirq+0x283/0x7bd
[ 79.603902][ C1] ? do_softirq_own_stack+0x2a/0x40
[ 79.609497][ C1] do_softirq_own_stack+0x2a/0x40
[ 79.614512][ C1]
[ 79.617612][ C1] do_softirq+0xfd/0x190
[ 79.621867][ C1] ? local_bh_enable+0x9/0x30
[ 79.626536][ C1] __local_bh_enable_ip+0x194/0x240
[ 79.631856][ C1] local_bh_enable+0x1f/0x30
[ 79.636548][ C1] nf_ct_iterate_cleanup+0x2fa/0x3a0
[ 79.642055][ C1] ? nf_ct_iterate_cleanup+0x3a0/0x3a0
[ 79.647606][ C1] ? iterate_cleanup_work+0x100/0x100
[ 79.653047][ C1] nf_ct_iterate_cleanup_net+0xf9/0x150
[ 79.658778][ C1] ? iterate_cleanup_work+0x100/0x100
[ 79.664436][ C1] iterate_cleanup_work+0x4f/0x100
[ 79.669546][ C1] process_one_work+0x7f5/0x10f0
[ 79.674488][ C1] worker_thread+0xbbc/0x1630
[ 79.679396][ C1] kthread+0x332/0x350
[ 79.683530][ C1] ? rcu_lock_release+0x30/0x30
[ 79.688471][ C1] ? kthread_blkcg+0xe0/0xe0
[ 79.693053][ C1] ret_from_fork+0x24/0x30
[ 79.699162][ C1] Kernel Offset: disabled
[ 79.703585][ C1] Rebooting in 86400 seconds..