INIT: Entering runlevel: 2 [info] Using makefile-style concurrent boot in runlevel 2. [....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] 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 '10.128.0.8' (ECDSA) to the list of known hosts. net.ipv6.conf.syz_tun.accept_dad = 0 net.ipv6.conf.syz_tun.router_solicitations = 0 syzkaller login: [ 40.440251] IPVS: ftp: loaded support on port[0] = 21 RTNETLINK answers: Operation not supported RTNETLINK answers: No buffer space available RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported [ 40.677478] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Invalid argument RTNETLINK answers: Invalid argument RTNETLINK answers: Invalid argument [ 41.015951] IPv6: ADDRCONF(NETDEV_UP): bond0: link is not ready [ 41.022081] 8021q: adding VLAN 0 to HW filter on device bond0 [ 41.057424] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 41.094395] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 41.130158] IPv6: ADDRCONF(NETDEV_UP): team0: link is not ready [ 41.136241] 8021q: adding VLAN 0 to HW filter on device team0 [ 41.162243] bond0: Enslaving bond_slave as an active interface with an up link [ 41.170582] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready executing program [ 41.185765] team0: Port device team_slave added [ 41.190976] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 41.228089] ================================================================== [ 41.235490] BUG: KASAN: use-after-free in skb_release_data+0x19b/0x860 [ 41.242134] Write of size 4 at addr ffff8801d47b61a0 by task syzkaller980970/4465 [ 41.249724] [ 41.251331] CPU: 0 PID: 4465 Comm: syzkaller980970 Not tainted 4.16.0+ #17 [ 41.258317] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 41.267644] Call Trace: [ 41.270208] dump_stack+0x1b9/0x294 [ 41.273814] ? dump_stack_print_info.cold.2+0x52/0x52 [ 41.278981] ? printk+0x9e/0xba [ 41.282238] ? kmsg_dump_rewind_nolock+0xe4/0xe4 [ 41.286974] ? kasan_check_write+0x14/0x20 [ 41.291189] print_address_description+0x6c/0x20b [ 41.296006] ? skb_release_data+0x19b/0x860 [ 41.300305] kasan_report.cold.7+0xac/0x2f5 [ 41.304606] check_memory_region+0x13e/0x1b0 [ 41.308990] kasan_check_write+0x14/0x20 [ 41.313026] skb_release_data+0x19b/0x860 [ 41.317152] ? skb_tx_error+0x2f0/0x2f0 [ 41.321103] ? kasan_check_read+0x11/0x20 [ 41.325228] ? rcu_is_watching+0x85/0x140 [ 41.329353] ? kasan_check_write+0x14/0x20 [ 41.333566] ? sock_rmem_free+0x6f/0x90 [ 41.337524] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 41.343040] skb_release_all+0x4a/0x60 [ 41.346905] kfree_skb+0x195/0x560 [ 41.350421] ? skb_queue_purge+0x19/0x40 [ 41.354459] ? __kfree_skb+0x20/0x20 [ 41.358152] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 41.362714] ? _raw_spin_unlock_irqrestore+0x74/0xc0 [ 41.367792] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 41.372783] ? trace_hardirqs_on+0xd/0x10 [ 41.376908] ? skb_dequeue+0x12f/0x180 [ 41.380771] skb_queue_purge+0x19/0x40 [ 41.384638] packet_sock_destruct+0x93/0x290 [ 41.389024] ? packet_mm_close+0xc0/0xc0 [ 41.393084] ? graph_lock+0x170/0x170 [ 41.396862] ? __free_object+0x16e/0x330 [ 41.400900] ? __list_del_entry_valid.cold.1+0x58/0x58 [ 41.406154] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 41.410716] ? packet_mm_close+0xc0/0xc0 [ 41.414755] __sk_destruct+0xff/0xa40 [ 41.418535] ? sock_warn_obsolete_bsdism+0xb0/0xb0 [ 41.423441] ? graph_lock+0x170/0x170 [ 41.427219] ? lock_downgrade+0x8e0/0x8e0 [ 41.431353] ? __lock_is_held+0xb5/0x140 [ 41.435396] ? kasan_check_read+0x11/0x20 [ 41.439524] ? do_raw_spin_unlock+0x9e/0x2e0 [ 41.443910] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 41.448471] ? _raw_spin_unlock_irqrestore+0x74/0xc0 [ 41.453558] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 41.459075] ? refcount_sub_and_test+0x212/0x330 [ 41.463809] ? refcount_inc_not_zero+0x2d0/0x2d0 [ 41.468543] ? refcount_inc_not_zero+0x2d0/0x2d0 [ 41.473276] ? pcpu_free_area+0xa90/0xa90 [ 41.477405] sk_destruct+0x78/0x90 [ 41.480923] __sk_free+0x22e/0x340 [ 41.484440] sk_free+0x42/0x50 [ 41.487614] packet_release+0xa18/0xd50 [ 41.491564] ? lock_downgrade+0x8e0/0x8e0 [ 41.495693] ? packet_lookup_frame+0x270/0x270 [ 41.500254] ? cpumask_weight.constprop.5+0x44/0x44 [ 41.505246] ? do_raw_spin_lock+0xc1/0x200 [ 41.509460] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 41.514974] ? locks_remove_file+0x3f7/0x5a0 [ 41.519361] ? fcntl_setlk+0x1020/0x1020 [ 41.523400] ? fsnotify+0x415/0x1100 [ 41.527101] ? fsnotify_first_mark+0x330/0x330 [ 41.531665] sock_release+0x96/0x1b0 [ 41.535357] ? sock_alloc_file+0x4e0/0x4e0 [ 41.539568] sock_close+0x16/0x20 [ 41.542996] __fput+0x34d/0x890 [ 41.546253] ? fput+0x1a0/0x1a0 [ 41.549513] ? check_same_owner+0x320/0x320 [ 41.553815] ____fput+0x15/0x20 [ 41.557071] task_work_run+0x1e4/0x290 [ 41.560937] ? task_work_cancel+0x240/0x240 [ 41.565248] ? switch_task_namespaces+0xbd/0xd0 [ 41.569900] do_exit+0x1aee/0x2730 [ 41.573416] ? find_held_lock+0x36/0x1c0 [ 41.577459] ? mm_update_next_owner+0x980/0x980 [ 41.582111] ? kasan_check_read+0x11/0x20 [ 41.586237] ? rcu_is_watching+0x85/0x140 [ 41.590364] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 41.595542] ? tun_get+0x22b/0x360 [ 41.599308] ? tun_chr_close+0x60/0x60 [ 41.603179] ? tun_chr_write_iter+0x110/0x154 [ 41.607655] ? fsnotify+0x415/0x1100 [ 41.611352] ? kasan_check_read+0x11/0x20 [ 41.615482] ? rcu_is_watching+0x85/0x140 [ 41.619608] ? rcu_pm_notify+0xc0/0xc0 [ 41.623476] ? vfs_writev+0x255/0x330 [ 41.627256] ? rcu_read_lock_sched_held+0x108/0x120 [ 41.632247] ? kfree+0x1e9/0x260 [ 41.635592] ? vfs_writev+0xfc/0x330 [ 41.639284] ? vfs_iter_write+0xb0/0xb0 [ 41.643237] ? lock_downgrade+0x8e0/0x8e0 [ 41.647365] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 41.652882] ? sockfd_lookup_light+0xc5/0x160 [ 41.657356] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 41.662871] ? __fdget_pos+0xd6/0x1e0 [ 41.666650] ? __fdget_raw+0x20/0x20 [ 41.670347] do_group_exit+0x16f/0x430 [ 41.674221] ? SyS_exit+0x30/0x30 [ 41.677654] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 41.682483] ? do_syscall_64+0xb7/0x9d0 [ 41.686434] ? do_group_exit+0x430/0x430 [ 41.690477] SyS_exit_group+0x1d/0x20 [ 41.694255] do_syscall_64+0x29e/0x9d0 [ 41.698118] ? vmalloc_sync_all+0x30/0x30 [ 41.702243] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 41.706976] ? syscall_return_slowpath+0x5c0/0x5c0 [ 41.711883] ? syscall_return_slowpath+0x30f/0x5c0 [ 41.716792] ? entry_SYSCALL_64_after_hwframe+0x52/0xb7 [ 41.722133] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 41.726956] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 41.732121] RIP: 0033:0x441819 [ 41.735289] RSP: 002b:00007ffd4e397518 EFLAGS: 00000202 ORIG_RAX: 00000000000000e7 [ 41.742973] RAX: ffffffffffffffda RBX: 000000000000001b RCX: 0000000000441819 [ 41.750218] RDX: 0000000000441750 RSI: 0000000000000001 RDI: 0000000000000001 [ 41.757465] RBP: 00000000004a3429 R08: 00000000024096b0 R09: 00000000006cd018 [ 41.764714] R10: 0000000000000100 R11: 0000000000000202 R12: 00007ffd4e397628 [ 41.771959] R13: 00000000004025a0 R14: 0000000000000000 R15: 0000000000000000 [ 41.779212] [ 41.780817] Allocated by task 4465: [ 41.784424] save_stack+0x43/0xd0 [ 41.787852] kasan_kmalloc+0xc4/0xe0 [ 41.791541] __kmalloc_node_track_caller+0x47/0x70 [ 41.796448] __kmalloc_reserve.isra.38+0x3a/0xe0 [ 41.801180] __alloc_skb+0x14d/0x780 [ 41.804868] alloc_skb_with_frags+0x137/0x760 [ 41.809338] sock_alloc_send_pskb+0x87a/0xae0 [ 41.813810] packet_sendmsg+0x1bd1/0x6100 [ 41.817934] sock_sendmsg+0xd5/0x120 [ 41.821625] ___sys_sendmsg+0x805/0x940 [ 41.825576] __sys_sendmsg+0x115/0x270 [ 41.829438] SyS_sendmsg+0x29/0x30 [ 41.832952] do_syscall_64+0x29e/0x9d0 [ 41.836816] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 41.841977] [ 41.843579] Freed by task 4465: [ 41.846836] save_stack+0x43/0xd0 [ 41.850265] __kasan_slab_free+0x11a/0x170 [ 41.854478] kasan_slab_free+0xe/0x10 [ 41.858253] kfree+0xd9/0x260 [ 41.861337] skb_free_head+0x99/0xc0 [ 41.865030] skb_release_data+0x690/0x860 [ 41.869154] skb_release_all+0x4a/0x60 [ 41.873016] kfree_skb+0x195/0x560 [ 41.876545] ip6_tnl_start_xmit+0xa44/0x2290 [ 41.880930] dev_hard_start_xmit+0x264/0xc10 [ 41.885313] __dev_queue_xmit+0x2724/0x34c0 [ 41.889611] dev_queue_xmit+0x17/0x20 [ 41.893386] packet_sendmsg+0x411d/0x6100 [ 41.897512] sock_sendmsg+0xd5/0x120 [ 41.901201] ___sys_sendmsg+0x805/0x940 [ 41.905149] __sys_sendmsg+0x115/0x270 [ 41.909011] SyS_sendmsg+0x29/0x30 [ 41.912530] do_syscall_64+0x29e/0x9d0 [ 41.916393] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 41.921553] [ 41.923157] The buggy address belongs to the object at ffff8801d47b60c0 [ 41.923157] which belongs to the cache kmalloc-512 of size 512 [ 41.935789] The buggy address is located 224 bytes inside of [ 41.935789] 512-byte region [ffff8801d47b60c0, ffff8801d47b62c0) [ 41.947635] The buggy address belongs to the page: [ 41.952543] page:ffffea000751ed80 count:1 mapcount:0 mapping:ffff8801d47b60c0 index:0x0 [ 41.960663] flags: 0x2fffc0000000100(slab) [ 41.964879] raw: 02fffc0000000100 ffff8801d47b60c0 0000000000000000 0000000100000006 [ 41.972736] raw: ffffea000751ea20 ffffea00074ed9e0 ffff8801dac00940 0000000000000000 [ 41.980589] page dumped because: kasan: bad access detected [ 41.986269] [ 41.987871] Memory state around the buggy address: [ 41.992776] ffff8801d47b6080: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb [ 42.000110] ffff8801d47b6100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 42.007446] >ffff8801d47b6180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 42.014779] ^ [ 42.019163] ffff8801d47b6200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 42.026498] ffff8801d47b6280: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 42.033830] ================================================================== [ 42.041162] Disabling lock debugging due to kernel taint [ 42.047005] Kernel panic - not syncing: panic_on_warn set ... [ 42.047005] [ 42.054354] CPU: 0 PID: 4465 Comm: syzkaller980970 Tainted: G B 4.16.0+ #17 [ 42.062640] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 42.071966] Call Trace: [ 42.074532] dump_stack+0x1b9/0x294 [ 42.078134] ? dump_stack_print_info.cold.2+0x52/0x52 [ 42.083300] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 42.088126] ? skb_release_data+0xd0/0x860 [ 42.092337] panic+0x22f/0x4de [ 42.095508] ? add_taint.cold.5+0x16/0x16 [ 42.099642] ? do_raw_spin_unlock+0x9e/0x2e0 [ 42.104026] ? do_raw_spin_unlock+0x9e/0x2e0 [ 42.108408] ? skb_release_data+0x19b/0x860 [ 42.112706] kasan_end_report+0x47/0x4f [ 42.116653] kasan_report.cold.7+0xc9/0x2f5 [ 42.120950] check_memory_region+0x13e/0x1b0 [ 42.125330] kasan_check_write+0x14/0x20 [ 42.129367] skb_release_data+0x19b/0x860 [ 42.133499] ? skb_tx_error+0x2f0/0x2f0 [ 42.137451] ? kasan_check_read+0x11/0x20 [ 42.141583] ? rcu_is_watching+0x85/0x140 [ 42.145708] ? kasan_check_write+0x14/0x20 [ 42.149919] ? sock_rmem_free+0x6f/0x90 [ 42.153869] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 42.159381] skb_release_all+0x4a/0x60 [ 42.163243] kfree_skb+0x195/0x560 [ 42.166759] ? skb_queue_purge+0x19/0x40 [ 42.170796] ? __kfree_skb+0x20/0x20 [ 42.174496] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 42.179054] ? _raw_spin_unlock_irqrestore+0x74/0xc0 [ 42.184133] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 42.189124] ? trace_hardirqs_on+0xd/0x10 [ 42.193248] ? skb_dequeue+0x12f/0x180 [ 42.197109] skb_queue_purge+0x19/0x40 [ 42.200973] packet_sock_destruct+0x93/0x290 [ 42.205358] ? packet_mm_close+0xc0/0xc0 [ 42.209393] ? graph_lock+0x170/0x170 [ 42.213171] ? __free_object+0x16e/0x330 [ 42.217206] ? __list_del_entry_valid.cold.1+0x58/0x58 [ 42.222461] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 42.227020] ? packet_mm_close+0xc0/0xc0 [ 42.231055] __sk_destruct+0xff/0xa40 [ 42.234833] ? sock_warn_obsolete_bsdism+0xb0/0xb0 [ 42.239737] ? graph_lock+0x170/0x170 [ 42.243513] ? lock_downgrade+0x8e0/0x8e0 [ 42.247636] ? __lock_is_held+0xb5/0x140 [ 42.251672] ? kasan_check_read+0x11/0x20 [ 42.255795] ? do_raw_spin_unlock+0x9e/0x2e0 [ 42.260179] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 42.264737] ? _raw_spin_unlock_irqrestore+0x74/0xc0 [ 42.269815] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 42.275327] ? refcount_sub_and_test+0x212/0x330 [ 42.280059] ? refcount_inc_not_zero+0x2d0/0x2d0 [ 42.284790] ? refcount_inc_not_zero+0x2d0/0x2d0 [ 42.289520] ? pcpu_free_area+0xa90/0xa90 [ 42.293645] sk_destruct+0x78/0x90 [ 42.297161] __sk_free+0x22e/0x340 [ 42.300677] sk_free+0x42/0x50 [ 42.303846] packet_release+0xa18/0xd50 [ 42.307792] ? lock_downgrade+0x8e0/0x8e0 [ 42.311915] ? packet_lookup_frame+0x270/0x270 [ 42.316475] ? cpumask_weight.constprop.5+0x44/0x44 [ 42.321476] ? do_raw_spin_lock+0xc1/0x200 [ 42.325688] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 42.331199] ? locks_remove_file+0x3f7/0x5a0 [ 42.335582] ? fcntl_setlk+0x1020/0x1020 [ 42.339617] ? fsnotify+0x415/0x1100 [ 42.343308] ? fsnotify_first_mark+0x330/0x330 [ 42.347867] sock_release+0x96/0x1b0 [ 42.351557] ? sock_alloc_file+0x4e0/0x4e0 [ 42.355767] sock_close+0x16/0x20 [ 42.359196] __fput+0x34d/0x890 [ 42.362450] ? fput+0x1a0/0x1a0 [ 42.365707] ? check_same_owner+0x320/0x320 [ 42.370004] ____fput+0x15/0x20 [ 42.373260] task_work_run+0x1e4/0x290 [ 42.377121] ? task_work_cancel+0x240/0x240 [ 42.381419] ? switch_task_namespaces+0xbd/0xd0 [ 42.386071] do_exit+0x1aee/0x2730 [ 42.389595] ? find_held_lock+0x36/0x1c0 [ 42.393633] ? mm_update_next_owner+0x980/0x980 [ 42.398278] ? kasan_check_read+0x11/0x20 [ 42.402401] ? rcu_is_watching+0x85/0x140 [ 42.406526] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 42.411694] ? tun_get+0x22b/0x360 [ 42.415208] ? tun_chr_close+0x60/0x60 [ 42.419073] ? tun_chr_write_iter+0x110/0x154 [ 42.423552] ? fsnotify+0x415/0x1100 [ 42.427244] ? kasan_check_read+0x11/0x20 [ 42.431367] ? rcu_is_watching+0x85/0x140 [ 42.435488] ? rcu_pm_notify+0xc0/0xc0 [ 42.439353] ? vfs_writev+0x255/0x330 [ 42.443128] ? rcu_read_lock_sched_held+0x108/0x120 [ 42.448118] ? kfree+0x1e9/0x260 [ 42.451461] ? vfs_writev+0xfc/0x330 [ 42.455152] ? vfs_iter_write+0xb0/0xb0 [ 42.459101] ? lock_downgrade+0x8e0/0x8e0 [ 42.463226] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 42.468739] ? sockfd_lookup_light+0xc5/0x160 [ 42.473210] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 42.478723] ? __fdget_pos+0xd6/0x1e0 [ 42.482500] ? __fdget_raw+0x20/0x20 [ 42.486193] do_group_exit+0x16f/0x430 [ 42.490057] ? SyS_exit+0x30/0x30 [ 42.493489] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 42.498306] ? do_syscall_64+0xb7/0x9d0 [ 42.502255] ? do_group_exit+0x430/0x430 [ 42.506292] SyS_exit_group+0x1d/0x20 [ 42.510068] do_syscall_64+0x29e/0x9d0 [ 42.513933] ? vmalloc_sync_all+0x30/0x30 [ 42.518057] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 42.522798] ? syscall_return_slowpath+0x5c0/0x5c0 [ 42.527705] ? syscall_return_slowpath+0x30f/0x5c0 [ 42.532613] ? entry_SYSCALL_64_after_hwframe+0x52/0xb7 [ 42.537953] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 42.542771] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 42.547934] RIP: 0033:0x441819 [ 42.551099] RSP: 002b:00007ffd4e397518 EFLAGS: 00000202 ORIG_RAX: 00000000000000e7 [ 42.558781] RAX: ffffffffffffffda RBX: 000000000000001b RCX: 0000000000441819 [ 42.566026] RDX: 0000000000441750 RSI: 0000000000000001 RDI: 0000000000000001 [ 42.573270] RBP: 00000000004a3429 R08: 00000000024096b0 R09: 00000000006cd018 [ 42.580515] R10: 0000000000000100 R11: 0000000000000202 R12: 00007ffd4e397628 [ 42.587760] R13: 00000000004025a0 R14: 0000000000000000 R15: 0000000000000000 [ 42.595369] Dumping ftrace buffer: [ 42.598883] (ftrace buffer empty) [ 42.602569] Kernel Offset: disabled [ 42.606173] Rebooting in 86400 seconds..