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 '10.128.10.7' (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: [ 30.819210] IPVS: ftp: loaded support on port[0] = 21 RTNETLINK answers: Operation not supported RTNETLINK answers: No buffer space available RTNETLINK answers: Operation not supported [ 31.070473] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Invalid argument RTNETLINK answers: Invalid argument RTNETLINK answers: Invalid argument [ 31.439747] IPv6: ADDRCONF(NETDEV_UP): bond0: link is not ready [ 31.445857] 8021q: adding VLAN 0 to HW filter on device bond0 [ 31.485355] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 31.524624] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 31.565394] IPv6: ADDRCONF(NETDEV_UP): team0: link is not ready [ 31.571498] 8021q: adding VLAN 0 to HW filter on device team0 [ 31.598258] bond0: Enslaving bond_slave as an active interface with an up link [ 31.606804] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready executing program [ 31.624791] team0: Port device team_slave added [ 31.630182] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 31.666100] ================================================================== [ 31.673533] BUG: KASAN: use-after-free in skb_release_data+0x19b/0x860 [ 31.680176] Write of size 4 at addr ffff8801d4056420 by task syzkaller028593/4482 [ 31.687766] [ 31.689378] CPU: 1 PID: 4482 Comm: syzkaller028593 Not tainted 4.16.0+ #17 [ 31.696366] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.705703] Call Trace: [ 31.708273] dump_stack+0x1b9/0x294 [ 31.711892] ? dump_stack_print_info.cold.2+0x52/0x52 [ 31.717072] ? printk+0x9e/0xba [ 31.720337] ? kmsg_dump_rewind_nolock+0xe4/0xe4 [ 31.725082] ? kasan_check_write+0x14/0x20 [ 31.729297] print_address_description+0x6c/0x20b [ 31.734121] ? skb_release_data+0x19b/0x860 [ 31.738418] kasan_report.cold.7+0xac/0x2f5 [ 31.742718] check_memory_region+0x13e/0x1b0 [ 31.747106] kasan_check_write+0x14/0x20 [ 31.751144] skb_release_data+0x19b/0x860 [ 31.755272] ? skb_tx_error+0x2f0/0x2f0 [ 31.759222] ? kasan_check_read+0x11/0x20 [ 31.763347] ? rcu_is_watching+0x85/0x140 [ 31.767473] ? kasan_check_write+0x14/0x20 [ 31.771686] ? sock_rmem_free+0x6f/0x90 [ 31.775639] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 31.781159] skb_release_all+0x4a/0x60 [ 31.785033] kfree_skb+0x195/0x560 [ 31.788568] ? skb_queue_purge+0x19/0x40 [ 31.792607] ? __kfree_skb+0x20/0x20 [ 31.796299] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 31.800860] ? _raw_spin_unlock_irqrestore+0x74/0xc0 [ 31.805949] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 31.810943] ? trace_hardirqs_on+0xd/0x10 [ 31.815070] ? skb_dequeue+0x12f/0x180 [ 31.818938] skb_queue_purge+0x19/0x40 [ 31.822805] packet_sock_destruct+0x93/0x290 [ 31.827190] ? packet_mm_close+0xc0/0xc0 [ 31.831229] ? graph_lock+0x170/0x170 [ 31.835009] ? __free_object+0x16e/0x330 [ 31.839058] ? __list_del_entry_valid.cold.1+0x58/0x58 [ 31.844320] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 31.848880] ? packet_mm_close+0xc0/0xc0 [ 31.852918] __sk_destruct+0xff/0xa40 [ 31.856698] ? sock_warn_obsolete_bsdism+0xb0/0xb0 [ 31.861604] ? graph_lock+0x170/0x170 [ 31.865385] ? lock_downgrade+0x8e0/0x8e0 [ 31.869510] ? __lock_is_held+0xb5/0x140 [ 31.873553] ? kasan_check_read+0x11/0x20 [ 31.877681] ? do_raw_spin_unlock+0x9e/0x2e0 [ 31.882067] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 31.886627] ? _raw_spin_unlock_irqrestore+0x74/0xc0 [ 31.891710] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.897233] ? refcount_sub_and_test+0x212/0x330 [ 31.901976] ? refcount_inc_not_zero+0x2d0/0x2d0 [ 31.906718] ? refcount_inc_not_zero+0x2d0/0x2d0 [ 31.911459] ? pcpu_free_area+0xa90/0xa90 [ 31.915606] sk_destruct+0x78/0x90 [ 31.919147] __sk_free+0x22e/0x340 [ 31.922665] sk_free+0x42/0x50 [ 31.925835] packet_release+0xa18/0xd50 [ 31.929785] ? lock_downgrade+0x8e0/0x8e0 [ 31.933912] ? packet_lookup_frame+0x270/0x270 [ 31.938483] ? cpumask_weight.constprop.5+0x44/0x44 [ 31.943479] ? do_raw_spin_lock+0xc1/0x200 [ 31.947693] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 31.953206] ? locks_remove_file+0x3f7/0x5a0 [ 31.957592] ? fcntl_setlk+0x1020/0x1020 [ 31.961633] ? fsnotify+0x415/0x1100 [ 31.965329] ? fsnotify_first_mark+0x330/0x330 [ 31.969896] sock_release+0x96/0x1b0 [ 31.973606] ? sock_alloc_file+0x4e0/0x4e0 [ 31.977818] sock_close+0x16/0x20 [ 31.981249] __fput+0x34d/0x890 [ 31.984518] ? fput+0x1a0/0x1a0 [ 31.987775] ? check_same_owner+0x320/0x320 [ 31.992091] ____fput+0x15/0x20 [ 31.995358] task_work_run+0x1e4/0x290 [ 31.999232] ? task_work_cancel+0x240/0x240 [ 32.003534] ? switch_task_namespaces+0xbd/0xd0 [ 32.008186] do_exit+0x1aee/0x2730 [ 32.011702] ? find_held_lock+0x36/0x1c0 [ 32.015742] ? mm_update_next_owner+0x980/0x980 [ 32.020395] ? kasan_check_read+0x11/0x20 [ 32.024521] ? rcu_is_watching+0x85/0x140 [ 32.028649] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 32.033821] ? tun_get+0x22b/0x360 [ 32.037337] ? tun_chr_close+0x60/0x60 [ 32.041205] ? tun_chr_write_iter+0x110/0x154 [ 32.045686] ? fsnotify+0x415/0x1100 [ 32.049383] ? kasan_check_read+0x11/0x20 [ 32.053508] ? rcu_is_watching+0x85/0x140 [ 32.057635] ? rcu_pm_notify+0xc0/0xc0 [ 32.061509] ? vfs_writev+0x255/0x330 [ 32.065305] ? rcu_read_lock_sched_held+0x108/0x120 [ 32.070301] ? kfree+0x1e9/0x260 [ 32.073645] ? vfs_writev+0xfc/0x330 [ 32.077340] ? vfs_iter_write+0xb0/0xb0 [ 32.081294] ? lock_downgrade+0x8e0/0x8e0 [ 32.085426] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 32.090942] ? sockfd_lookup_light+0xc5/0x160 [ 32.095429] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.100953] ? __fdget_pos+0xd6/0x1e0 [ 32.104731] ? __fdget_raw+0x20/0x20 [ 32.108428] do_group_exit+0x16f/0x430 [ 32.112295] ? SyS_exit+0x30/0x30 [ 32.115727] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 32.120560] ? do_syscall_64+0xb7/0x9d0 [ 32.124512] ? do_group_exit+0x430/0x430 [ 32.128548] SyS_exit_group+0x1d/0x20 [ 32.132326] do_syscall_64+0x29e/0x9d0 [ 32.136279] ? vmalloc_sync_all+0x30/0x30 [ 32.140404] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 32.145139] ? syscall_return_slowpath+0x5c0/0x5c0 [ 32.150049] ? syscall_return_slowpath+0x30f/0x5c0 [ 32.154960] ? entry_SYSCALL_64_after_hwframe+0x52/0xb7 [ 32.160302] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 32.165140] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 32.170309] RIP: 0033:0x441819 [ 32.173475] RSP: 002b:00007ffdbf7a15e8 EFLAGS: 00000206 ORIG_RAX: 00000000000000e7 [ 32.181172] RAX: ffffffffffffffda RBX: 000000000000001b RCX: 0000000000441819 [ 32.188417] RDX: 0000000000441750 RSI: 0000000000000001 RDI: 0000000000000001 [ 32.195666] RBP: 00000000004a3429 R08: 0000000001d956b0 R09: 00000000006cd018 [ 32.202912] R10: 0000000000000100 R11: 0000000000000206 R12: 00007ffdbf7a16f8 [ 32.210157] R13: 00000000004025a0 R14: 0000000000000000 R15: 0000000000000000 [ 32.217410] [ 32.219018] Allocated by task 4482: [ 32.222632] save_stack+0x43/0xd0 [ 32.226064] kasan_kmalloc+0xc4/0xe0 [ 32.229760] __kmalloc_node_track_caller+0x47/0x70 [ 32.234673] __kmalloc_reserve.isra.38+0x3a/0xe0 [ 32.239501] __alloc_skb+0x14d/0x780 [ 32.243192] alloc_skb_with_frags+0x137/0x760 [ 32.247672] sock_alloc_send_pskb+0x87a/0xae0 [ 32.252147] packet_sendmsg+0x1bd1/0x6100 [ 32.256273] sock_sendmsg+0xd5/0x120 [ 32.259970] ___sys_sendmsg+0x805/0x940 [ 32.263916] __sys_sendmsg+0x115/0x270 [ 32.267777] SyS_sendmsg+0x29/0x30 [ 32.271294] do_syscall_64+0x29e/0x9d0 [ 32.275157] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 32.280316] [ 32.281919] Freed by task 4482: [ 32.285174] save_stack+0x43/0xd0 [ 32.288608] __kasan_slab_free+0x11a/0x170 [ 32.292817] kasan_slab_free+0xe/0x10 [ 32.296607] kfree+0xd9/0x260 [ 32.299691] skb_free_head+0x99/0xc0 [ 32.303381] skb_release_data+0x690/0x860 [ 32.307505] skb_release_all+0x4a/0x60 [ 32.311378] kfree_skb+0x195/0x560 [ 32.314895] ip6_tnl_start_xmit+0xa44/0x2290 [ 32.319278] dev_hard_start_xmit+0x264/0xc10 [ 32.323664] __dev_queue_xmit+0x2724/0x34c0 [ 32.327962] dev_queue_xmit+0x17/0x20 [ 32.331736] packet_sendmsg+0x411d/0x6100 [ 32.335861] sock_sendmsg+0xd5/0x120 [ 32.339553] ___sys_sendmsg+0x805/0x940 [ 32.343504] __sys_sendmsg+0x115/0x270 [ 32.347367] SyS_sendmsg+0x29/0x30 [ 32.350886] do_syscall_64+0x29e/0x9d0 [ 32.354751] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 32.359920] [ 32.361612] The buggy address belongs to the object at ffff8801d4056340 [ 32.361612] which belongs to the cache kmalloc-512 of size 512 [ 32.374250] The buggy address is located 224 bytes inside of [ 32.374250] 512-byte region [ffff8801d4056340, ffff8801d4056540) [ 32.386099] The buggy address belongs to the page: [ 32.391011] page:ffffea0007501580 count:1 mapcount:0 mapping:ffff8801d40560c0 index:0x0 [ 32.399149] flags: 0x2fffc0000000100(slab) [ 32.403363] raw: 02fffc0000000100 ffff8801d40560c0 0000000000000000 0000000100000006 [ 32.411224] raw: ffffea00075014e0 ffffea00075015e0 ffff8801dac00940 0000000000000000 [ 32.419084] page dumped because: kasan: bad access detected [ 32.424770] [ 32.426371] Memory state around the buggy address: [ 32.431277] ffff8801d4056300: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb [ 32.438612] ffff8801d4056380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 32.445949] >ffff8801d4056400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 32.453282] ^ [ 32.457670] ffff8801d4056480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 32.465014] ffff8801d4056500: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 32.472359] ================================================================== [ 32.479696] Disabling lock debugging due to kernel taint [ 32.485612] Kernel panic - not syncing: panic_on_warn set ... [ 32.485612] [ 32.492987] CPU: 1 PID: 4482 Comm: syzkaller028593 Tainted: G B 4.16.0+ #17 [ 32.501300] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.510637] Call Trace: [ 32.513208] dump_stack+0x1b9/0x294 [ 32.516812] ? dump_stack_print_info.cold.2+0x52/0x52 [ 32.521978] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 32.526711] ? skb_release_data+0xd0/0x860 [ 32.530932] panic+0x22f/0x4de [ 32.534104] ? add_taint.cold.5+0x16/0x16 [ 32.538239] ? do_raw_spin_unlock+0x9e/0x2e0 [ 32.542623] ? do_raw_spin_unlock+0x9e/0x2e0 [ 32.547012] ? skb_release_data+0x19b/0x860 [ 32.551325] kasan_end_report+0x47/0x4f [ 32.555276] kasan_report.cold.7+0xc9/0x2f5 [ 32.559574] check_memory_region+0x13e/0x1b0 [ 32.563961] kasan_check_write+0x14/0x20 [ 32.567998] skb_release_data+0x19b/0x860 [ 32.572128] ? skb_tx_error+0x2f0/0x2f0 [ 32.576075] ? kasan_check_read+0x11/0x20 [ 32.580208] ? rcu_is_watching+0x85/0x140 [ 32.584341] ? kasan_check_write+0x14/0x20 [ 32.588551] ? sock_rmem_free+0x6f/0x90 [ 32.592503] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 32.598023] skb_release_all+0x4a/0x60 [ 32.601890] kfree_skb+0x195/0x560 [ 32.605404] ? skb_queue_purge+0x19/0x40 [ 32.609440] ? __kfree_skb+0x20/0x20 [ 32.613132] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 32.617689] ? _raw_spin_unlock_irqrestore+0x74/0xc0 [ 32.622775] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 32.627765] ? trace_hardirqs_on+0xd/0x10 [ 32.631889] ? skb_dequeue+0x12f/0x180 [ 32.635753] skb_queue_purge+0x19/0x40 [ 32.639627] packet_sock_destruct+0x93/0x290 [ 32.644014] ? packet_mm_close+0xc0/0xc0 [ 32.648053] ? graph_lock+0x170/0x170 [ 32.651832] ? __free_object+0x16e/0x330 [ 32.655870] ? __list_del_entry_valid.cold.1+0x58/0x58 [ 32.661126] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 32.665686] ? packet_mm_close+0xc0/0xc0 [ 32.669722] __sk_destruct+0xff/0xa40 [ 32.673498] ? sock_warn_obsolete_bsdism+0xb0/0xb0 [ 32.678401] ? graph_lock+0x170/0x170 [ 32.682175] ? lock_downgrade+0x8e0/0x8e0 [ 32.686296] ? __lock_is_held+0xb5/0x140 [ 32.690332] ? kasan_check_read+0x11/0x20 [ 32.694458] ? do_raw_spin_unlock+0x9e/0x2e0 [ 32.698842] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 32.703401] ? _raw_spin_unlock_irqrestore+0x74/0xc0 [ 32.708482] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.713994] ? refcount_sub_and_test+0x212/0x330 [ 32.718728] ? refcount_inc_not_zero+0x2d0/0x2d0 [ 32.723459] ? refcount_inc_not_zero+0x2d0/0x2d0 [ 32.728191] ? pcpu_free_area+0xa90/0xa90 [ 32.732316] sk_destruct+0x78/0x90 [ 32.735837] __sk_free+0x22e/0x340 [ 32.739354] sk_free+0x42/0x50 [ 32.742520] packet_release+0xa18/0xd50 [ 32.746469] ? lock_downgrade+0x8e0/0x8e0 [ 32.750595] ? packet_lookup_frame+0x270/0x270 [ 32.755154] ? cpumask_weight.constprop.5+0x44/0x44 [ 32.760147] ? do_raw_spin_lock+0xc1/0x200 [ 32.764357] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 32.769869] ? locks_remove_file+0x3f7/0x5a0 [ 32.774254] ? fcntl_setlk+0x1020/0x1020 [ 32.778290] ? fsnotify+0x415/0x1100 [ 32.781981] ? fsnotify_first_mark+0x330/0x330 [ 32.786542] sock_release+0x96/0x1b0 [ 32.790235] ? sock_alloc_file+0x4e0/0x4e0 [ 32.794445] sock_close+0x16/0x20 [ 32.797872] __fput+0x34d/0x890 [ 32.801132] ? fput+0x1a0/0x1a0 [ 32.804392] ? check_same_owner+0x320/0x320 [ 32.808691] ____fput+0x15/0x20 [ 32.811947] task_work_run+0x1e4/0x290 [ 32.815807] ? task_work_cancel+0x240/0x240 [ 32.820114] ? switch_task_namespaces+0xbd/0xd0 [ 32.824763] do_exit+0x1aee/0x2730 [ 32.828291] ? find_held_lock+0x36/0x1c0 [ 32.832328] ? mm_update_next_owner+0x980/0x980 [ 32.836975] ? kasan_check_read+0x11/0x20 [ 32.841100] ? rcu_is_watching+0x85/0x140 [ 32.845223] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 32.850391] ? tun_get+0x22b/0x360 [ 32.853904] ? tun_chr_close+0x60/0x60 [ 32.857769] ? tun_chr_write_iter+0x110/0x154 [ 32.862241] ? fsnotify+0x415/0x1100 [ 32.865950] ? kasan_check_read+0x11/0x20 [ 32.870075] ? rcu_is_watching+0x85/0x140 [ 32.874199] ? rcu_pm_notify+0xc0/0xc0 [ 32.878075] ? vfs_writev+0x255/0x330 [ 32.881853] ? rcu_read_lock_sched_held+0x108/0x120 [ 32.886844] ? kfree+0x1e9/0x260 [ 32.890189] ? vfs_writev+0xfc/0x330 [ 32.893878] ? vfs_iter_write+0xb0/0xb0 [ 32.897838] ? lock_downgrade+0x8e0/0x8e0 [ 32.901962] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 32.907483] ? sockfd_lookup_light+0xc5/0x160 [ 32.911954] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.917469] ? __fdget_pos+0xd6/0x1e0 [ 32.921247] ? __fdget_raw+0x20/0x20 [ 32.924941] do_group_exit+0x16f/0x430 [ 32.928802] ? SyS_exit+0x30/0x30 [ 32.932232] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 32.937053] ? do_syscall_64+0xb7/0x9d0 [ 32.941006] ? do_group_exit+0x430/0x430 [ 32.945831] SyS_exit_group+0x1d/0x20 [ 32.949615] do_syscall_64+0x29e/0x9d0 [ 32.953480] ? vmalloc_sync_all+0x30/0x30 [ 32.957609] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 32.962353] ? syscall_return_slowpath+0x5c0/0x5c0 [ 32.967258] ? syscall_return_slowpath+0x30f/0x5c0 [ 32.972171] ? entry_SYSCALL_64_after_hwframe+0x52/0xb7 [ 32.977515] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 32.982332] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 32.987497] RIP: 0033:0x441819 [ 32.990661] RSP: 002b:00007ffdbf7a15e8 EFLAGS: 00000206 ORIG_RAX: 00000000000000e7 [ 32.998344] RAX: ffffffffffffffda RBX: 000000000000001b RCX: 0000000000441819 [ 33.005692] RDX: 0000000000441750 RSI: 0000000000000001 RDI: 0000000000000001 [ 33.012936] RBP: 00000000004a3429 R08: 0000000001d956b0 R09: 00000000006cd018 [ 33.020181] R10: 0000000000000100 R11: 0000000000000206 R12: 00007ffdbf7a16f8 [ 33.027426] R13: 00000000004025a0 R14: 0000000000000000 R15: 0000000000000000 [ 33.035131] Dumping ftrace buffer: [ 33.038650] (ftrace buffer empty) [ 33.042334] Kernel Offset: disabled [ 33.045936] Rebooting in 86400 seconds..