[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 95.836026][ T27] audit: type=1800 audit(1581812160.957:25): pid=9605 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 95.856471][ T27] audit: type=1800 audit(1581812160.957:26): pid=9605 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 95.910146][ T27] audit: type=1800 audit(1581812160.957:27): pid=9605 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.43' (ECDSA) to the list of known hosts. syzkaller login: [ 106.337431][ T9761] IPVS: ftp: loaded support on port[0] = 21 [ 106.384431][ T9761] chnl_net:caif_netlink_parms(): no params data found [ 106.430872][ T9761] bridge0: port 1(bridge_slave_0) entered blocking state [ 106.438414][ T9761] bridge0: port 1(bridge_slave_0) entered disabled state [ 106.446284][ T9761] device bridge_slave_0 entered promiscuous mode [ 106.454677][ T9761] bridge0: port 2(bridge_slave_1) entered blocking state [ 106.461750][ T9761] bridge0: port 2(bridge_slave_1) entered disabled state [ 106.469564][ T9761] device bridge_slave_1 entered promiscuous mode [ 106.486931][ T9761] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 106.497597][ T9761] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 106.516070][ T9761] team0: Port device team_slave_0 added [ 106.523378][ T9761] team0: Port device team_slave_1 added [ 106.537427][ T9761] batman_adv: batadv0: Adding interface: batadv_slave_0 [ 106.544403][ T9761] 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. [ 106.570315][ T9761] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active [ 106.582551][ T9761] batman_adv: batadv0: Adding interface: batadv_slave_1 [ 106.589554][ T9761] 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. [ 106.615505][ T9761] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active [ 106.676221][ T9761] device hsr_slave_0 entered promiscuous mode [ 106.734528][ T9761] device hsr_slave_1 entered promiscuous mode [ 106.863623][ T9761] netdevsim netdevsim0 netdevsim0: renamed from eth0 [ 106.917163][ T9761] netdevsim netdevsim0 netdevsim1: renamed from eth1 [ 106.976728][ T9761] netdevsim netdevsim0 netdevsim2: renamed from eth2 [ 107.047155][ T9761] netdevsim netdevsim0 netdevsim3: renamed from eth3 [ 107.098198][ T9761] bridge0: port 2(bridge_slave_1) entered blocking state [ 107.105334][ T9761] bridge0: port 2(bridge_slave_1) entered forwarding state [ 107.112830][ T9761] bridge0: port 1(bridge_slave_0) entered blocking state [ 107.119940][ T9761] bridge0: port 1(bridge_slave_0) entered forwarding state [ 107.157730][ T9761] 8021q: adding VLAN 0 to HW filter on device bond0 [ 107.172822][ T2777] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 107.182559][ T2777] bridge0: port 1(bridge_slave_0) entered disabled state [ 107.190738][ T2777] bridge0: port 2(bridge_slave_1) entered disabled state [ 107.198613][ T2777] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 107.211260][ T9761] 8021q: adding VLAN 0 to HW filter on device team0 [ 107.221853][ T3120] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 107.231060][ T3120] bridge0: port 1(bridge_slave_0) entered blocking state [ 107.238364][ T3120] bridge0: port 1(bridge_slave_0) entered forwarding state [ 107.249580][ T2777] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 107.258513][ T2777] bridge0: port 2(bridge_slave_1) entered blocking state [ 107.265636][ T2777] bridge0: port 2(bridge_slave_1) entered forwarding state [ 107.285942][ T2787] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 107.295741][ T2787] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 107.306438][ T3120] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 107.318066][ T2831] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 107.329224][ T3119] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 107.339784][ T9761] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 107.357821][ T2831] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready [ 107.366240][ T2831] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready [ 107.378215][ T9761] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 107.396883][ T3119] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_virt_wifi: link becomes ready [ 107.405958][ T3119] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 107.424448][ T2831] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_vlan: link becomes ready [ 107.432715][ T2831] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 107.445086][ T9761] device veth0_vlan entered promiscuous mode [ 107.459061][ T2831] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 107.468079][ T2831] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 107.477328][ T9761] device veth1_vlan entered promiscuous mode [ 107.496659][ T3119] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan0: link becomes ready [ 107.505053][ T3119] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan1: link becomes ready [ 107.513111][ T3119] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_macvtap: link becomes ready [ 107.522340][ T3119] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 107.532869][ T9761] device veth0_macvtap entered promiscuous mode [ 107.543832][ T9761] device veth1_macvtap entered promiscuous mode [ 107.559910][ T9761] batman_adv: batadv0: Interface activated: batadv_slave_0 [ 107.568108][ T2831] IPv6: ADDRCONF(NETDEV_CHANGE): macvtap0: link becomes ready [ 107.576395][ T2831] IPv6: ADDRCONF(NETDEV_CHANGE): macsec0: link becomes ready [ 107.584150][ T2831] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_0: link becomes ready [ 107.593136][ T2831] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 107.605289][ T9761] batman_adv: batadv0: Interface activated: batadv_slave_1 [ 107.613067][ T3120] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready [ 107.621873][ T3120] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready executing program [ 107.804351][ C1] ================================================================== [ 107.812653][ C1] BUG: KASAN: use-after-free in rt6_uncached_list_del+0x25f/0x2f0 [ 107.820436][ C1] Read of size 8 at addr ffff888098c8a588 by task swapper/1/0 [ 107.827863][ C1] [ 107.830179][ C1] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.6.0-rc1-syzkaller #0 [ 107.838077][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 107.848147][ C1] Call Trace: [ 107.851407][ C1] [ 107.854249][ C1] dump_stack+0x197/0x210 [ 107.858556][ C1] ? rt6_uncached_list_del+0x25f/0x2f0 [ 107.863999][ C1] print_address_description.constprop.0.cold+0xd4/0x30b [ 107.870996][ C1] ? rt6_uncached_list_del+0x25f/0x2f0 [ 107.876430][ C1] ? rt6_uncached_list_del+0x25f/0x2f0 [ 107.881865][ C1] __kasan_report.cold+0x1b/0x32 [ 107.886784][ C1] ? ip6_dst_destroy+0x170/0x2a0 [ 107.891697][ C1] ? rt6_uncached_list_del+0x25f/0x2f0 [ 107.897137][ C1] kasan_report+0x12/0x20 [ 107.901455][ C1] __asan_report_load8_noabort+0x14/0x20 [ 107.907063][ C1] rt6_uncached_list_del+0x25f/0x2f0 [ 107.912327][ C1] ip6_dst_destroy+0xbb/0x2a0 [ 107.916996][ C1] ? rt6_uncached_list_del+0x2f0/0x2f0 [ 107.922444][ C1] dst_destroy+0x114/0x3c0 [ 107.926858][ C1] dst_destroy_rcu+0x16/0x19 [ 107.931454][ C1] rcu_core+0x5e1/0x1390 [ 107.935787][ C1] ? __rcu_read_unlock+0x700/0x700 [ 107.940885][ C1] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 107.946412][ C1] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 107.952388][ C1] ? run_rebalance_domains+0x227/0x2d0 [ 107.957834][ C1] rcu_core_si+0x9/0x10 [ 107.961971][ C1] __do_softirq+0x262/0x98c [ 107.966450][ C1] ? sched_clock_cpu+0x1b/0x1b0 [ 107.971291][ C1] irq_exit+0x19b/0x1e0 [ 107.975428][ C1] smp_apic_timer_interrupt+0x1a3/0x610 [ 107.980956][ C1] apic_timer_interrupt+0xf/0x20 [ 107.985866][ C1] [ 107.988794][ C1] RIP: 0010:native_safe_halt+0xe/0x10 [ 107.994155][ C1] Code: e8 0e c5 f9 eb 8a cc cc cc cc cc cc e9 07 00 00 00 0f 00 2d 04 5a 59 00 f4 c3 66 90 e9 07 00 00 00 0f 00 2d f4 59 59 00 fb f4 cc 55 48 89 e5 41 57 41 56 41 55 41 54 53 e8 5e c6 73 f9 e8 b9 [ 108.013750][ C1] RSP: 0018:ffffc90000d3fd68 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 [ 108.022177][ C1] RAX: 1ffffffff136761a RBX: ffff8880a99fc340 RCX: 0000000000000000 [ 108.030163][ C1] RDX: dffffc0000000000 RSI: 0000000000000006 RDI: ffff8880a99fcbd4 [ 108.038148][ C1] RBP: ffffc90000d3fd98 R08: ffff8880a99fc340 R09: 0000000000000000 [ 108.046145][ C1] R10: 0000000000000000 R11: 0000000000000000 R12: dffffc0000000000 [ 108.054099][ C1] R13: ffffffff8aa5a3c0 R14: 0000000000000000 R15: 0000000000000001 [ 108.062080][ C1] ? default_idle+0x4e/0x360 [ 108.066659][ C1] arch_cpu_idle+0xa/0x10 [ 108.071010][ C1] default_idle_call+0x84/0xb0 [ 108.075775][ C1] do_idle+0x3c8/0x6e0 [ 108.079836][ C1] ? arch_cpu_idle_exit+0x80/0x80 [ 108.084840][ C1] ? _raw_spin_unlock_irqrestore+0x9f/0xe0 [ 108.090620][ C1] ? complete+0x61/0x80 [ 108.094776][ C1] cpu_startup_entry+0x1b/0x20 [ 108.099521][ C1] start_secondary+0x2f4/0x410 [ 108.104276][ C1] ? set_cpu_sibling_map+0x2140/0x2140 [ 108.109734][ C1] secondary_startup_64+0xa4/0xb0 [ 108.114769][ C1] [ 108.117073][ C1] Allocated by task 9761: [ 108.121389][ C1] save_stack+0x23/0x90 [ 108.125529][ C1] __kasan_kmalloc.constprop.0+0xcf/0xe0 [ 108.131144][ C1] kasan_kmalloc+0x9/0x10 [ 108.135460][ C1] __kmalloc_node+0x4e/0x70 [ 108.140047][ C1] kvmalloc_node+0x68/0x100 [ 108.144526][ C1] alloc_netdev_mqs+0x98/0xe40 [ 108.149262][ C1] rtnl_create_link+0x22d/0xaf0 [ 108.154100][ C1] __rtnl_newlink+0xf9f/0x1790 [ 108.158838][ C1] rtnl_newlink+0x69/0xa0 [ 108.163144][ C1] rtnetlink_rcv_msg+0x45e/0xaf0 [ 108.168069][ C1] netlink_rcv_skb+0x177/0x450 [ 108.172811][ C1] rtnetlink_rcv+0x1d/0x30 [ 108.177205][ C1] netlink_unicast+0x59e/0x7e0 [ 108.181958][ C1] netlink_sendmsg+0x91c/0xea0 [ 108.186763][ C1] sock_sendmsg+0xd7/0x130 [ 108.191195][ C1] __sys_sendto+0x262/0x380 [ 108.195680][ C1] __ia32_compat_sys_socketcall+0x530/0x710 [ 108.201558][ C1] do_fast_syscall_32+0x27b/0xe16 [ 108.206566][ C1] entry_SYSENTER_compat+0x70/0x7f [ 108.211690][ C1] [ 108.213996][ C1] Freed by task 9761: [ 108.217956][ C1] save_stack+0x23/0x90 [ 108.222097][ C1] __kasan_slab_free+0x102/0x150 [ 108.227040][ C1] kasan_slab_free+0xe/0x10 [ 108.231520][ C1] kfree+0x10a/0x2c0 [ 108.235406][ C1] __netdev_name_node_alt_destroy+0x1ff/0x2a0 [ 108.241465][ C1] netdev_name_node_alt_destroy+0x57/0x80 [ 108.247168][ C1] rtnl_linkprop.isra.0+0x575/0x6f0 [ 108.252378][ C1] rtnl_dellinkprop+0x46/0x60 [ 108.257037][ C1] rtnetlink_rcv_msg+0x45e/0xaf0 [ 108.261951][ C1] netlink_rcv_skb+0x177/0x450 [ 108.266688][ C1] rtnetlink_rcv+0x1d/0x30 [ 108.271119][ C1] netlink_unicast+0x59e/0x7e0 [ 108.275859][ C1] netlink_sendmsg+0x91c/0xea0 [ 108.280596][ C1] sock_sendmsg+0xd7/0x130 [ 108.284986][ C1] ____sys_sendmsg+0x753/0x880 [ 108.289722][ C1] ___sys_sendmsg+0x100/0x170 [ 108.294372][ C1] __sys_sendmsg+0x105/0x1d0 [ 108.298939][ C1] __ia32_compat_sys_sendmsg+0x7a/0xb0 [ 108.304378][ C1] do_fast_syscall_32+0x27b/0xe16 [ 108.309383][ C1] entry_SYSENTER_compat+0x70/0x7f [ 108.314464][ C1] [ 108.316769][ C1] The buggy address belongs to the object at ffff888098c8a000 [ 108.316769][ C1] which belongs to the cache kmalloc-4k of size 4096 [ 108.330795][ C1] The buggy address is located 1416 bytes inside of [ 108.330795][ C1] 4096-byte region [ffff888098c8a000, ffff888098c8b000) [ 108.344213][ C1] The buggy address belongs to the page: [ 108.349825][ C1] page:ffffea0002632280 refcount:1 mapcount:0 mapping:ffff8880aa402000 index:0x0 compound_mapcount: 0 [ 108.360726][ C1] flags: 0xfffe0000010200(slab|head) [ 108.365991][ C1] raw: 00fffe0000010200 ffffea0002607488 ffffea00025af788 ffff8880aa402000 [ 108.374594][ C1] raw: 0000000000000000 ffff888098c8a000 0000000100000001 0000000000000000 [ 108.383165][ C1] page dumped because: kasan: bad access detected [ 108.389547][ C1] [ 108.391851][ C1] Memory state around the buggy address: [ 108.397499][ C1] ffff888098c8a480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 108.405550][ C1] ffff888098c8a500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 108.413603][ C1] >ffff888098c8a580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 108.421635][ C1] ^ [ 108.425940][ C1] ffff888098c8a600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 108.433977][ C1] ffff888098c8a680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 108.442021][ C1] ================================================================== [ 108.450054][ C1] Disabling lock debugging due to kernel taint [ 108.456224][ C1] Kernel panic - not syncing: panic_on_warn set ... [ 108.462806][ C1] CPU: 1 PID: 0 Comm: swapper/1 Tainted: G B 5.6.0-rc1-syzkaller #0 [ 108.472147][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 108.482190][ C1] Call Trace: [ 108.485448][ C1] [ 108.488280][ C1] dump_stack+0x197/0x210 [ 108.492602][ C1] panic+0x2e3/0x75c [ 108.496474][ C1] ? add_taint.cold+0x16/0x16 [ 108.501131][ C1] ? trace_hardirqs_on+0x5e/0x240 [ 108.506144][ C1] ? trace_hardirqs_on+0x5e/0x240 [ 108.511153][ C1] ? rt6_uncached_list_del+0x25f/0x2f0 [ 108.516599][ C1] end_report+0x47/0x4f [ 108.520731][ C1] ? rt6_uncached_list_del+0x25f/0x2f0 [ 108.526178][ C1] __kasan_report.cold+0xe/0x32 [ 108.531012][ C1] ? ip6_dst_destroy+0x170/0x2a0 [ 108.535934][ C1] ? rt6_uncached_list_del+0x25f/0x2f0 [ 108.541376][ C1] kasan_report+0x12/0x20 [ 108.545690][ C1] __asan_report_load8_noabort+0x14/0x20 [ 108.551313][ C1] rt6_uncached_list_del+0x25f/0x2f0 [ 108.556613][ C1] ip6_dst_destroy+0xbb/0x2a0 [ 108.561319][ C1] ? rt6_uncached_list_del+0x2f0/0x2f0 [ 108.566774][ C1] dst_destroy+0x114/0x3c0 [ 108.571171][ C1] dst_destroy_rcu+0x16/0x19 [ 108.575742][ C1] rcu_core+0x5e1/0x1390 [ 108.579964][ C1] ? __rcu_read_unlock+0x700/0x700 [ 108.585102][ C1] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 108.590713][ C1] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 108.596668][ C1] ? run_rebalance_domains+0x227/0x2d0 [ 108.602147][ C1] rcu_core_si+0x9/0x10 [ 108.606285][ C1] __do_softirq+0x262/0x98c [ 108.610876][ C1] ? sched_clock_cpu+0x1b/0x1b0 [ 108.615728][ C1] irq_exit+0x19b/0x1e0 [ 108.619877][ C1] smp_apic_timer_interrupt+0x1a3/0x610 [ 108.625495][ C1] apic_timer_interrupt+0xf/0x20 [ 108.630405][ C1] [ 108.633334][ C1] RIP: 0010:native_safe_halt+0xe/0x10 [ 108.639092][ C1] Code: e8 0e c5 f9 eb 8a cc cc cc cc cc cc e9 07 00 00 00 0f 00 2d 04 5a 59 00 f4 c3 66 90 e9 07 00 00 00 0f 00 2d f4 59 59 00 fb f4 cc 55 48 89 e5 41 57 41 56 41 55 41 54 53 e8 5e c6 73 f9 e8 b9 [ 108.658678][ C1] RSP: 0018:ffffc90000d3fd68 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 [ 108.667104][ C1] RAX: 1ffffffff136761a RBX: ffff8880a99fc340 RCX: 0000000000000000 [ 108.675053][ C1] RDX: dffffc0000000000 RSI: 0000000000000006 RDI: ffff8880a99fcbd4 [ 108.683017][ C1] RBP: ffffc90000d3fd98 R08: ffff8880a99fc340 R09: 0000000000000000 [ 108.690966][ C1] R10: 0000000000000000 R11: 0000000000000000 R12: dffffc0000000000 [ 108.698926][ C1] R13: ffffffff8aa5a3c0 R14: 0000000000000000 R15: 0000000000000001 [ 108.706906][ C1] ? default_idle+0x4e/0x360 [ 108.711478][ C1] arch_cpu_idle+0xa/0x10 [ 108.715785][ C1] default_idle_call+0x84/0xb0 [ 108.720541][ C1] do_idle+0x3c8/0x6e0 [ 108.724615][ C1] ? arch_cpu_idle_exit+0x80/0x80 [ 108.729616][ C1] ? _raw_spin_unlock_irqrestore+0x9f/0xe0 [ 108.735396][ C1] ? complete+0x61/0x80 [ 108.739528][ C1] cpu_startup_entry+0x1b/0x20 [ 108.744285][ C1] start_secondary+0x2f4/0x410 [ 108.749022][ C1] ? set_cpu_sibling_map+0x2140/0x2140 [ 108.754460][ C1] secondary_startup_64+0xa4/0xb0 [ 108.760699][ C1] Kernel Offset: disabled [ 108.765021][ C1] Rebooting in 86400 seconds..