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 '10.128.10.31' (ECDSA) to the list of known hosts. net.ipv6.conf.syz_tun.accept_dad = 0 syzkaller login: [ 31.740792] IPVS: ftp: loaded support on port[0] = 21 net.ipv6.conf.syz_tun.router_solicitations = 0 RTNETLINK answers: Operation not supported RTNETLINK answers: No buffer space available RTNETLINK answers: Operation not supported [ 32.011368] 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 [ 32.402978] IPv6: ADDRCONF(NETDEV_UP): bond0: link is not ready [ 32.409114] 8021q: adding VLAN 0 to HW filter on device bond0 [ 32.450066] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 32.491932] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 32.533566] IPv6: ADDRCONF(NETDEV_UP): team0: link is not ready [ 32.539672] 8021q: adding VLAN 0 to HW filter on device team0 [ 32.568698] bond0: Enslaving bond_slave as an active interface with an up link executing program [ 32.578153] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 32.591825] team0: Port device team_slave added [ 32.597201] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 32.632136] ================================================================== [ 32.639574] BUG: KASAN: use-after-free in skb_release_data+0x19b/0x860 [ 32.646239] Write of size 4 at addr ffff8801d4653920 by task syzkaller187955/4487 [ 32.653829] [ 32.655436] CPU: 0 PID: 4487 Comm: syzkaller187955 Not tainted 4.16.0+ #17 [ 32.662418] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.671751] Call Trace: [ 32.674318] dump_stack+0x1b9/0x294 [ 32.677929] ? dump_stack_print_info.cold.2+0x52/0x52 [ 32.683094] ? printk+0x9e/0xba [ 32.686349] ? kmsg_dump_rewind_nolock+0xe4/0xe4 [ 32.691081] ? kasan_check_write+0x14/0x20 [ 32.695298] print_address_description+0x6c/0x20b [ 32.700119] ? skb_release_data+0x19b/0x860 [ 32.704591] kasan_report.cold.7+0xac/0x2f5 [ 32.708891] check_memory_region+0x13e/0x1b0 [ 32.713279] kasan_check_write+0x14/0x20 [ 32.717333] skb_release_data+0x19b/0x860 [ 32.721466] ? skb_tx_error+0x2f0/0x2f0 [ 32.725419] ? kasan_check_read+0x11/0x20 [ 32.729546] ? rcu_is_watching+0x85/0x140 [ 32.733670] ? kasan_check_write+0x14/0x20 [ 32.737882] ? sock_rmem_free+0x6f/0x90 [ 32.741835] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 32.747527] skb_release_all+0x4a/0x60 [ 32.751391] kfree_skb+0x195/0x560 [ 32.754910] ? skb_queue_purge+0x19/0x40 [ 32.758950] ? __kfree_skb+0x20/0x20 [ 32.762641] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 32.767202] ? _raw_spin_unlock_irqrestore+0x74/0xc0 [ 32.772288] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 32.777280] ? trace_hardirqs_on+0xd/0x10 [ 32.781407] ? skb_dequeue+0x12f/0x180 [ 32.785272] skb_queue_purge+0x19/0x40 [ 32.789137] packet_sock_destruct+0x93/0x290 [ 32.793519] ? packet_mm_close+0xc0/0xc0 [ 32.797565] ? graph_lock+0x170/0x170 [ 32.801344] ? __free_object+0x16e/0x330 [ 32.805381] ? __list_del_entry_valid.cold.1+0x58/0x58 [ 32.810643] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 32.815202] ? packet_mm_close+0xc0/0xc0 [ 32.819238] __sk_destruct+0xff/0xa40 [ 32.823029] ? sock_warn_obsolete_bsdism+0xb0/0xb0 [ 32.827944] ? graph_lock+0x170/0x170 [ 32.831728] ? lock_downgrade+0x8e0/0x8e0 [ 32.835851] ? __lock_is_held+0xb5/0x140 [ 32.839908] ? kasan_check_read+0x11/0x20 [ 32.844040] ? do_raw_spin_unlock+0x9e/0x2e0 [ 32.848426] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 32.852989] ? _raw_spin_unlock_irqrestore+0x74/0xc0 [ 32.858075] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.863591] ? refcount_sub_and_test+0x212/0x330 [ 32.868333] ? refcount_inc_not_zero+0x2d0/0x2d0 [ 32.873065] ? refcount_inc_not_zero+0x2d0/0x2d0 [ 32.877799] ? pcpu_free_area+0xa90/0xa90 [ 32.881932] sk_destruct+0x78/0x90 [ 32.885451] __sk_free+0x22e/0x340 [ 32.888985] sk_free+0x42/0x50 [ 32.892158] packet_release+0xa18/0xd50 [ 32.896109] ? lock_downgrade+0x8e0/0x8e0 [ 32.900239] ? packet_lookup_frame+0x270/0x270 [ 32.904798] ? cpumask_weight.constprop.5+0x44/0x44 [ 32.909792] ? do_raw_spin_lock+0xc1/0x200 [ 32.914011] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 32.919531] ? locks_remove_file+0x3f7/0x5a0 [ 32.923916] ? fcntl_setlk+0x1020/0x1020 [ 32.927953] ? fsnotify+0x415/0x1100 [ 32.931647] ? fsnotify_first_mark+0x330/0x330 [ 32.936206] sock_release+0x96/0x1b0 [ 32.939900] ? sock_alloc_file+0x4e0/0x4e0 [ 32.944111] sock_close+0x16/0x20 [ 32.947540] __fput+0x34d/0x890 [ 32.950796] ? fput+0x1a0/0x1a0 [ 32.954060] ? check_same_owner+0x320/0x320 [ 32.958363] ____fput+0x15/0x20 [ 32.961618] task_work_run+0x1e4/0x290 [ 32.965487] ? task_work_cancel+0x240/0x240 [ 32.969804] ? switch_task_namespaces+0xbd/0xd0 [ 32.974457] do_exit+0x1aee/0x2730 [ 32.977976] ? find_held_lock+0x36/0x1c0 [ 32.982038] ? mm_update_next_owner+0x980/0x980 [ 32.986689] ? kasan_check_read+0x11/0x20 [ 32.990815] ? rcu_is_watching+0x85/0x140 [ 32.994940] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 33.000112] ? tun_get+0x22b/0x360 [ 33.003629] ? tun_chr_close+0x60/0x60 [ 33.007496] ? tun_chr_write_iter+0x110/0x154 [ 33.011967] ? fsnotify+0x415/0x1100 [ 33.015662] ? kasan_check_read+0x11/0x20 [ 33.019794] ? rcu_is_watching+0x85/0x140 [ 33.023919] ? rcu_pm_notify+0xc0/0xc0 [ 33.027788] ? vfs_writev+0x255/0x330 [ 33.031564] ? rcu_read_lock_sched_held+0x108/0x120 [ 33.036554] ? kfree+0x1e9/0x260 [ 33.039901] ? vfs_writev+0xfc/0x330 [ 33.043591] ? vfs_iter_write+0xb0/0xb0 [ 33.047541] ? lock_downgrade+0x8e0/0x8e0 [ 33.051668] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 33.057183] ? sockfd_lookup_light+0xc5/0x160 [ 33.061656] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 33.067172] ? __fdget_pos+0xd6/0x1e0 [ 33.070951] ? __fdget_raw+0x20/0x20 [ 33.074647] do_group_exit+0x16f/0x430 [ 33.078512] ? SyS_exit+0x30/0x30 [ 33.081944] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 33.086770] ? do_syscall_64+0xb7/0x9d0 [ 33.090722] ? do_group_exit+0x430/0x430 [ 33.094759] SyS_exit_group+0x1d/0x20 [ 33.098539] do_syscall_64+0x29e/0x9d0 [ 33.102401] ? vmalloc_sync_all+0x30/0x30 [ 33.106532] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 33.111264] ? syscall_return_slowpath+0x5c0/0x5c0 [ 33.116172] ? syscall_return_slowpath+0x30f/0x5c0 [ 33.121089] ? entry_SYSCALL_64_after_hwframe+0x52/0xb7 [ 33.126433] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 33.131257] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 33.136420] RIP: 0033:0x441979 [ 33.139591] RSP: 002b:00007fffe2de2638 EFLAGS: 00000202 ORIG_RAX: 00000000000000e7 [ 33.147276] RAX: ffffffffffffffda RBX: 000000000000001b RCX: 0000000000441979 [ 33.154529] RDX: 00000000004418b0 RSI: 0000000000000001 RDI: 0000000000000001 [ 33.161776] RBP: 00000000004a3589 R08: 0000000000000020 R09: 00000000006cd018 [ 33.169030] R10: 0000000000000000 R11: 0000000000000202 R12: 00007fffe2de2738 [ 33.176277] R13: 0000000000402700 R14: 0000000000000000 R15: 0000000000000000 [ 33.183527] [ 33.185129] Allocated by task 4487: [ 33.188735] save_stack+0x43/0xd0 [ 33.192165] kasan_kmalloc+0xc4/0xe0 [ 33.195874] __kmalloc_node_track_caller+0x47/0x70 [ 33.200781] __kmalloc_reserve.isra.38+0x3a/0xe0 [ 33.205514] __alloc_skb+0x14d/0x780 [ 33.209202] alloc_skb_with_frags+0x137/0x760 [ 33.213677] sock_alloc_send_pskb+0x87a/0xae0 [ 33.218149] packet_sendmsg+0x1bd1/0x6100 [ 33.222272] sock_sendmsg+0xd5/0x120 [ 33.225962] ___sys_sendmsg+0x805/0x940 [ 33.229912] __sys_sendmsg+0x115/0x270 [ 33.233782] SyS_sendmsg+0x29/0x30 [ 33.237299] do_syscall_64+0x29e/0x9d0 [ 33.241171] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 33.246331] [ 33.247935] Freed by task 4487: [ 33.251192] save_stack+0x43/0xd0 [ 33.254629] __kasan_slab_free+0x11a/0x170 [ 33.258838] kasan_slab_free+0xe/0x10 [ 33.262613] kfree+0xd9/0x260 [ 33.265695] skb_free_head+0x99/0xc0 [ 33.269396] skb_release_data+0x690/0x860 [ 33.273520] skb_release_all+0x4a/0x60 [ 33.277383] kfree_skb+0x195/0x560 [ 33.280902] ip6_tnl_start_xmit+0xa44/0x2290 [ 33.285285] dev_hard_start_xmit+0x264/0xc10 [ 33.289670] __dev_queue_xmit+0x2724/0x34c0 [ 33.293966] dev_queue_xmit+0x17/0x20 [ 33.297744] packet_sendmsg+0x411d/0x6100 [ 33.301881] sock_sendmsg+0xd5/0x120 [ 33.305572] ___sys_sendmsg+0x805/0x940 [ 33.309520] __sys_sendmsg+0x115/0x270 [ 33.313382] SyS_sendmsg+0x29/0x30 [ 33.316899] do_syscall_64+0x29e/0x9d0 [ 33.320772] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 33.325932] [ 33.327544] The buggy address belongs to the object at ffff8801d4653840 [ 33.327544] which belongs to the cache kmalloc-512 of size 512 [ 33.340187] The buggy address is located 224 bytes inside of [ 33.340187] 512-byte region [ffff8801d4653840, ffff8801d4653a40) [ 33.352077] The buggy address belongs to the page: [ 33.356990] page:ffffea00075194c0 count:1 mapcount:0 mapping:ffff8801d46530c0 index:0x0 [ 33.365116] flags: 0x2fffc0000000100(slab) [ 33.369331] raw: 02fffc0000000100 ffff8801d46530c0 0000000000000000 0000000100000006 [ 33.377190] raw: ffffea00075194a0 ffffea000751ca60 ffff8801dac00940 0000000000000000 [ 33.385045] page dumped because: kasan: bad access detected [ 33.390729] [ 33.392327] Memory state around the buggy address: [ 33.397232] ffff8801d4653800: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb [ 33.404575] ffff8801d4653880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 33.411910] >ffff8801d4653900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 33.419245] ^ [ 33.423628] ffff8801d4653980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 33.430962] ffff8801d4653a00: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 33.438292] ================================================================== [ 33.445623] Disabling lock debugging due to kernel taint [ 33.451520] Kernel panic - not syncing: panic_on_warn set ... [ 33.451520] [ 33.458890] CPU: 0 PID: 4487 Comm: syzkaller187955 Tainted: G B 4.16.0+ #17 [ 33.467203] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.476530] Call Trace: [ 33.479094] dump_stack+0x1b9/0x294 [ 33.482698] ? dump_stack_print_info.cold.2+0x52/0x52 [ 33.487864] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 33.492593] ? skb_release_data+0xd0/0x860 [ 33.496800] panic+0x22f/0x4de [ 33.499968] ? add_taint.cold.5+0x16/0x16 [ 33.504089] ? do_raw_spin_unlock+0x9e/0x2e0 [ 33.508472] ? do_raw_spin_unlock+0x9e/0x2e0 [ 33.512859] ? skb_release_data+0x19b/0x860 [ 33.517154] kasan_end_report+0x47/0x4f [ 33.521102] kasan_report.cold.7+0xc9/0x2f5 [ 33.525399] check_memory_region+0x13e/0x1b0 [ 33.529780] kasan_check_write+0x14/0x20 [ 33.533823] skb_release_data+0x19b/0x860 [ 33.537950] ? skb_tx_error+0x2f0/0x2f0 [ 33.541898] ? kasan_check_read+0x11/0x20 [ 33.546029] ? rcu_is_watching+0x85/0x140 [ 33.550162] ? kasan_check_write+0x14/0x20 [ 33.554377] ? sock_rmem_free+0x6f/0x90 [ 33.558328] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 33.563844] skb_release_all+0x4a/0x60 [ 33.567708] kfree_skb+0x195/0x560 [ 33.571222] ? skb_queue_purge+0x19/0x40 [ 33.575256] ? __kfree_skb+0x20/0x20 [ 33.578945] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 33.583516] ? _raw_spin_unlock_irqrestore+0x74/0xc0 [ 33.588594] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 33.593582] ? trace_hardirqs_on+0xd/0x10 [ 33.597705] ? skb_dequeue+0x12f/0x180 [ 33.601566] skb_queue_purge+0x19/0x40 [ 33.605434] packet_sock_destruct+0x93/0x290 [ 33.609817] ? packet_mm_close+0xc0/0xc0 [ 33.613855] ? graph_lock+0x170/0x170 [ 33.617631] ? __free_object+0x16e/0x330 [ 33.621664] ? __list_del_entry_valid.cold.1+0x58/0x58 [ 33.626914] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 33.631468] ? packet_mm_close+0xc0/0xc0 [ 33.635502] __sk_destruct+0xff/0xa40 [ 33.639279] ? sock_warn_obsolete_bsdism+0xb0/0xb0 [ 33.644187] ? graph_lock+0x170/0x170 [ 33.647961] ? lock_downgrade+0x8e0/0x8e0 [ 33.652099] ? __lock_is_held+0xb5/0x140 [ 33.656157] ? kasan_check_read+0x11/0x20 [ 33.660297] ? do_raw_spin_unlock+0x9e/0x2e0 [ 33.664683] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 33.669243] ? _raw_spin_unlock_irqrestore+0x74/0xc0 [ 33.674329] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 33.679852] ? refcount_sub_and_test+0x212/0x330 [ 33.684589] ? refcount_inc_not_zero+0x2d0/0x2d0 [ 33.689316] ? refcount_inc_not_zero+0x2d0/0x2d0 [ 33.694046] ? pcpu_free_area+0xa90/0xa90 [ 33.698174] sk_destruct+0x78/0x90 [ 33.701687] __sk_free+0x22e/0x340 [ 33.705204] sk_free+0x42/0x50 [ 33.708371] packet_release+0xa18/0xd50 [ 33.712320] ? lock_downgrade+0x8e0/0x8e0 [ 33.716447] ? packet_lookup_frame+0x270/0x270 [ 33.721018] ? cpumask_weight.constprop.5+0x44/0x44 [ 33.726019] ? do_raw_spin_lock+0xc1/0x200 [ 33.730236] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 33.735756] ? locks_remove_file+0x3f7/0x5a0 [ 33.740142] ? fcntl_setlk+0x1020/0x1020 [ 33.744196] ? fsnotify+0x415/0x1100 [ 33.747890] ? fsnotify_first_mark+0x330/0x330 [ 33.752453] sock_release+0x96/0x1b0 [ 33.756165] ? sock_alloc_file+0x4e0/0x4e0 [ 33.760376] sock_close+0x16/0x20 [ 33.763806] __fput+0x34d/0x890 [ 33.767070] ? fput+0x1a0/0x1a0 [ 33.770326] ? check_same_owner+0x320/0x320 [ 33.774622] ____fput+0x15/0x20 [ 33.777883] task_work_run+0x1e4/0x290 [ 33.781751] ? task_work_cancel+0x240/0x240 [ 33.786050] ? switch_task_namespaces+0xbd/0xd0 [ 33.790694] do_exit+0x1aee/0x2730 [ 33.794211] ? find_held_lock+0x36/0x1c0 [ 33.798253] ? mm_update_next_owner+0x980/0x980 [ 33.802897] ? kasan_check_read+0x11/0x20 [ 33.807034] ? rcu_is_watching+0x85/0x140 [ 33.811156] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 33.816328] ? tun_get+0x22b/0x360 [ 33.819843] ? tun_chr_close+0x60/0x60 [ 33.823706] ? tun_chr_write_iter+0x110/0x154 [ 33.828175] ? fsnotify+0x415/0x1100 [ 33.831865] ? kasan_check_read+0x11/0x20 [ 33.835985] ? rcu_is_watching+0x85/0x140 [ 33.840111] ? rcu_pm_notify+0xc0/0xc0 [ 33.843977] ? vfs_writev+0x255/0x330 [ 33.847751] ? rcu_read_lock_sched_held+0x108/0x120 [ 33.852738] ? kfree+0x1e9/0x260 [ 33.856078] ? vfs_writev+0xfc/0x330 [ 33.859767] ? vfs_iter_write+0xb0/0xb0 [ 33.863721] ? lock_downgrade+0x8e0/0x8e0 [ 33.867848] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 33.873367] ? sockfd_lookup_light+0xc5/0x160 [ 33.877853] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 33.883375] ? __fdget_pos+0xd6/0x1e0 [ 33.887153] ? __fdget_raw+0x20/0x20 [ 33.890848] do_group_exit+0x16f/0x430 [ 33.894713] ? SyS_exit+0x30/0x30 [ 33.898142] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 33.902958] ? do_syscall_64+0xb7/0x9d0 [ 33.906912] ? do_group_exit+0x430/0x430 [ 33.910952] SyS_exit_group+0x1d/0x20 [ 33.914730] do_syscall_64+0x29e/0x9d0 [ 33.918601] ? vmalloc_sync_all+0x30/0x30 [ 33.922723] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 33.927454] ? syscall_return_slowpath+0x5c0/0x5c0 [ 33.932361] ? syscall_return_slowpath+0x30f/0x5c0 [ 33.937278] ? entry_SYSCALL_64_after_hwframe+0x52/0xb7 [ 33.942619] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 33.947452] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 33.952614] RIP: 0033:0x441979 [ 33.955784] RSP: 002b:00007fffe2de2638 EFLAGS: 00000202 ORIG_RAX: 00000000000000e7 [ 33.963477] RAX: ffffffffffffffda RBX: 000000000000001b RCX: 0000000000441979 [ 33.970720] RDX: 00000000004418b0 RSI: 0000000000000001 RDI: 0000000000000001 [ 33.977963] RBP: 00000000004a3589 R08: 0000000000000020 R09: 00000000006cd018 [ 33.985299] R10: 0000000000000000 R11: 0000000000000202 R12: 00007fffe2de2738 [ 33.992550] R13: 0000000000402700 R14: 0000000000000000 R15: 0000000000000000 [ 34.000367] Dumping ftrace buffer: [ 34.003883] (ftrace buffer empty) [ 34.007565] Kernel Offset: disabled [ 34.011166] Rebooting in 86400 seconds..