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 '10.128.0.39' (ECDSA) to the list of known hosts. net.ipv6.conf.syz_tun.accept_dad = 0 syzkaller login: [ 31.578855] 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 [ 31.858637] 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 [ 32.259506] IPv6: ADDRCONF(NETDEV_UP): bond0: link is not ready [ 32.265632] 8021q: adding VLAN 0 to HW filter on device bond0 [ 32.308096] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 32.348864] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 32.391889] IPv6: ADDRCONF(NETDEV_UP): team0: link is not ready [ 32.398038] 8021q: adding VLAN 0 to HW filter on device team0 [ 32.427135] bond0: Enslaving bond_slave as an active interface with an up link [ 32.435878] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready executing program [ 32.453388] team0: Port device team_slave added [ 32.458703] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 32.505221] ================================================================== [ 32.512707] BUG: KASAN: use-after-free in skb_release_data+0x19b/0x860 [ 32.519359] Write of size 4 at addr ffff8801d47f1ba0 by task syzkaller583245/4464 [ 32.526953] [ 32.528564] CPU: 0 PID: 4464 Comm: syzkaller583245 Not tainted 4.16.0+ #17 [ 32.535561] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.544903] Call Trace: [ 32.547476] dump_stack+0x1b9/0x294 [ 32.551088] ? dump_stack_print_info.cold.2+0x52/0x52 [ 32.556261] ? printk+0x9e/0xba [ 32.559529] ? kmsg_dump_rewind_nolock+0xe4/0xe4 [ 32.564275] ? kasan_check_write+0x14/0x20 [ 32.568508] print_address_description+0x6c/0x20b [ 32.573328] ? skb_release_data+0x19b/0x860 [ 32.577629] kasan_report.cold.7+0xac/0x2f5 [ 32.581934] check_memory_region+0x13e/0x1b0 [ 32.586321] kasan_check_write+0x14/0x20 [ 32.590372] skb_release_data+0x19b/0x860 [ 32.594506] ? skb_tx_error+0x2f0/0x2f0 [ 32.598462] ? kasan_check_read+0x11/0x20 [ 32.602592] ? rcu_is_watching+0x85/0x140 [ 32.606721] ? kasan_check_write+0x14/0x20 [ 32.610947] ? sock_rmem_free+0x6f/0x90 [ 32.614911] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 32.620434] skb_release_all+0x4a/0x60 [ 32.624305] kfree_skb+0x195/0x560 [ 32.627841] ? skb_queue_purge+0x19/0x40 [ 32.631893] ? __kfree_skb+0x20/0x20 [ 32.635591] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 32.640156] ? _raw_spin_unlock_irqrestore+0x74/0xc0 [ 32.645246] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 32.650257] ? trace_hardirqs_on+0xd/0x10 [ 32.654391] ? skb_dequeue+0x12f/0x180 [ 32.658285] skb_queue_purge+0x19/0x40 [ 32.662159] packet_sock_destruct+0x93/0x290 [ 32.666548] ? packet_mm_close+0xc0/0xc0 [ 32.670593] ? graph_lock+0x170/0x170 [ 32.674465] ? __free_object+0x16e/0x330 [ 32.678509] ? __list_del_entry_valid.cold.1+0x58/0x58 [ 32.683769] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 32.688331] ? packet_mm_close+0xc0/0xc0 [ 32.692376] __sk_destruct+0xff/0xa40 [ 32.696174] ? sock_warn_obsolete_bsdism+0xb0/0xb0 [ 32.701085] ? graph_lock+0x170/0x170 [ 32.704875] ? lock_downgrade+0x8e0/0x8e0 [ 32.709003] ? __lock_is_held+0xb5/0x140 [ 32.713045] ? kasan_check_read+0x11/0x20 [ 32.717172] ? do_raw_spin_unlock+0x9e/0x2e0 [ 32.721561] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 32.726136] ? _raw_spin_unlock_irqrestore+0x74/0xc0 [ 32.731244] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.736775] ? refcount_sub_and_test+0x212/0x330 [ 32.741512] ? refcount_inc_not_zero+0x2d0/0x2d0 [ 32.746253] ? refcount_inc_not_zero+0x2d0/0x2d0 [ 32.750997] ? pcpu_free_area+0xa90/0xa90 [ 32.755134] sk_destruct+0x78/0x90 [ 32.758652] __sk_free+0x22e/0x340 [ 32.762192] sk_free+0x42/0x50 [ 32.765364] packet_release+0xa18/0xd50 [ 32.769322] ? lock_downgrade+0x8e0/0x8e0 [ 32.773450] ? packet_lookup_frame+0x270/0x270 [ 32.778021] ? cpumask_weight.constprop.5+0x44/0x44 [ 32.783040] ? do_raw_spin_lock+0xc1/0x200 [ 32.787437] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 32.792957] ? locks_remove_file+0x3f7/0x5a0 [ 32.797346] ? fcntl_setlk+0x1020/0x1020 [ 32.801399] ? fsnotify+0x415/0x1100 [ 32.805097] ? fsnotify_first_mark+0x330/0x330 [ 32.809660] sock_release+0x96/0x1b0 [ 32.813354] ? sock_alloc_file+0x4e0/0x4e0 [ 32.817566] sock_close+0x16/0x20 [ 32.820997] __fput+0x34d/0x890 [ 32.824282] ? fput+0x1a0/0x1a0 [ 32.827544] ? check_same_owner+0x320/0x320 [ 32.831845] ____fput+0x15/0x20 [ 32.835104] task_work_run+0x1e4/0x290 [ 32.838970] ? task_work_cancel+0x240/0x240 [ 32.843291] ? switch_task_namespaces+0xbd/0xd0 [ 32.848123] do_exit+0x1aee/0x2730 [ 32.851645] ? find_held_lock+0x36/0x1c0 [ 32.855694] ? mm_update_next_owner+0x980/0x980 [ 32.860383] ? kasan_check_read+0x11/0x20 [ 32.864520] ? rcu_is_watching+0x85/0x140 [ 32.868647] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 32.873821] ? tun_get+0x22b/0x360 [ 32.877342] ? tun_chr_close+0x60/0x60 [ 32.881222] ? tun_chr_write_iter+0x110/0x154 [ 32.885697] ? fsnotify+0x415/0x1100 [ 32.889397] ? kasan_check_read+0x11/0x20 [ 32.893523] ? rcu_is_watching+0x85/0x140 [ 32.897650] ? rcu_pm_notify+0xc0/0xc0 [ 32.901534] ? vfs_writev+0x255/0x330 [ 32.905354] ? rcu_read_lock_sched_held+0x108/0x120 [ 32.910360] ? kfree+0x1e9/0x260 [ 32.913715] ? vfs_writev+0xfc/0x330 [ 32.917408] ? vfs_iter_write+0xb0/0xb0 [ 32.921369] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 32.926893] ? sockfd_lookup_light+0xc5/0x160 [ 32.931376] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.936895] ? __fdget_pos+0xd6/0x1e0 [ 32.940673] ? __fdget_raw+0x20/0x20 [ 32.944392] do_group_exit+0x16f/0x430 [ 32.948259] ? SyS_exit+0x30/0x30 [ 32.951700] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 32.956524] ? do_syscall_64+0xb7/0x9d0 [ 32.960476] ? do_group_exit+0x430/0x430 [ 32.964518] SyS_exit_group+0x1d/0x20 [ 32.968308] do_syscall_64+0x29e/0x9d0 [ 32.972174] ? vmalloc_sync_all+0x30/0x30 [ 32.976305] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 32.981049] ? syscall_return_slowpath+0x5c0/0x5c0 [ 32.985960] ? syscall_return_slowpath+0x30f/0x5c0 [ 32.990877] ? entry_SYSCALL_64_after_hwframe+0x52/0xb7 [ 32.996236] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 33.001062] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 33.006237] RIP: 0033:0x441739 [ 33.009409] RSP: 002b:00007fff0dccca08 EFLAGS: 00000202 ORIG_RAX: 00000000000000e7 [ 33.017100] RAX: ffffffffffffffda RBX: 000000000000001b RCX: 0000000000441739 [ 33.024482] RDX: 0000000000441670 RSI: 0000000000000001 RDI: 0000000000000001 [ 33.031730] RBP: 00000000004a3349 R08: 000000000000000e R09: 00000000006cd018 [ 33.039131] R10: 0000000000000003 R11: 0000000000000202 R12: 00007fff0dcccaf8 [ 33.046382] R13: 00000000004024c0 R14: 0000000000000000 R15: 0000000000000000 [ 33.053639] [ 33.055247] Allocated by task 4464: [ 33.058874] save_stack+0x43/0xd0 [ 33.062302] kasan_kmalloc+0xc4/0xe0 [ 33.065994] __kmalloc_node_track_caller+0x47/0x70 [ 33.070936] __kmalloc_reserve.isra.38+0x3a/0xe0 [ 33.075670] __alloc_skb+0x14d/0x780 [ 33.079364] alloc_skb_with_frags+0x137/0x760 [ 33.083839] sock_alloc_send_pskb+0x87a/0xae0 [ 33.088315] packet_sendmsg+0x1bd1/0x6100 [ 33.092441] sock_sendmsg+0xd5/0x120 [ 33.096132] ___sys_sendmsg+0x805/0x940 [ 33.100090] __sys_sendmsg+0x115/0x270 [ 33.103964] SyS_sendmsg+0x29/0x30 [ 33.107492] do_syscall_64+0x29e/0x9d0 [ 33.111364] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 33.116529] [ 33.118135] Freed by task 4464: [ 33.121404] save_stack+0x43/0xd0 [ 33.124834] __kasan_slab_free+0x11a/0x170 [ 33.129053] kasan_slab_free+0xe/0x10 [ 33.132832] kfree+0xd9/0x260 [ 33.135919] skb_free_head+0x99/0xc0 [ 33.139609] skb_release_data+0x690/0x860 [ 33.143754] skb_release_all+0x4a/0x60 [ 33.147621] kfree_skb+0x195/0x560 [ 33.151142] ip6_tnl_start_xmit+0xa44/0x2290 [ 33.155525] dev_hard_start_xmit+0x264/0xc10 [ 33.159908] __dev_queue_xmit+0x2724/0x34c0 [ 33.164207] dev_queue_xmit+0x17/0x20 [ 33.167990] packet_sendmsg+0x411d/0x6100 [ 33.172121] sock_sendmsg+0xd5/0x120 [ 33.175812] ___sys_sendmsg+0x805/0x940 [ 33.179774] __sys_sendmsg+0x115/0x270 [ 33.183650] SyS_sendmsg+0x29/0x30 [ 33.187170] do_syscall_64+0x29e/0x9d0 [ 33.191039] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 33.196204] [ 33.197811] The buggy address belongs to the object at ffff8801d47f1ac0 [ 33.197811] which belongs to the cache kmalloc-512 of size 512 [ 33.210457] The buggy address is located 224 bytes inside of [ 33.210457] 512-byte region [ffff8801d47f1ac0, ffff8801d47f1cc0) [ 33.222309] The buggy address belongs to the page: [ 33.227226] page:ffffea000751fc40 count:1 mapcount:0 mapping:ffff8801d47f10c0 index:0x0 [ 33.235359] flags: 0x2fffc0000000100(slab) [ 33.239576] raw: 02fffc0000000100 ffff8801d47f10c0 0000000000000000 0000000100000006 [ 33.247450] raw: ffffea000751fc20 ffffea000751fce0 ffff8801dac00940 0000000000000000 [ 33.255305] page dumped because: kasan: bad access detected [ 33.260987] [ 33.262598] Memory state around the buggy address: [ 33.267517] ffff8801d47f1a80: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb [ 33.274856] ffff8801d47f1b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 33.282198] >ffff8801d47f1b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 33.289539] ^ [ 33.293935] ffff8801d47f1c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 33.301272] ffff8801d47f1c80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 33.308606] ================================================================== [ 33.315938] Disabling lock debugging due to kernel taint [ 33.321751] Kernel panic - not syncing: panic_on_warn set ... [ 33.321751] [ 33.329144] CPU: 0 PID: 4464 Comm: syzkaller583245 Tainted: G B 4.16.0+ #17 [ 33.337447] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.346782] Call Trace: [ 33.349378] dump_stack+0x1b9/0x294 [ 33.352987] ? dump_stack_print_info.cold.2+0x52/0x52 [ 33.358157] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 33.362894] ? skb_release_data+0xd0/0x860 [ 33.367115] panic+0x22f/0x4de [ 33.370283] ? add_taint.cold.5+0x16/0x16 [ 33.374411] ? do_raw_spin_unlock+0x9e/0x2e0 [ 33.378800] ? do_raw_spin_unlock+0x9e/0x2e0 [ 33.383190] ? skb_release_data+0x19b/0x860 [ 33.387494] kasan_end_report+0x47/0x4f [ 33.391450] kasan_report.cold.7+0xc9/0x2f5 [ 33.395751] check_memory_region+0x13e/0x1b0 [ 33.400136] kasan_check_write+0x14/0x20 [ 33.404172] skb_release_data+0x19b/0x860 [ 33.408306] ? skb_tx_error+0x2f0/0x2f0 [ 33.412258] ? kasan_check_read+0x11/0x20 [ 33.416382] ? rcu_is_watching+0x85/0x140 [ 33.420507] ? kasan_check_write+0x14/0x20 [ 33.424730] ? sock_rmem_free+0x6f/0x90 [ 33.428702] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 33.434219] skb_release_all+0x4a/0x60 [ 33.438085] kfree_skb+0x195/0x560 [ 33.441600] ? skb_queue_purge+0x19/0x40 [ 33.445640] ? __kfree_skb+0x20/0x20 [ 33.449334] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 33.453892] ? _raw_spin_unlock_irqrestore+0x74/0xc0 [ 33.458980] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 33.463975] ? trace_hardirqs_on+0xd/0x10 [ 33.468101] ? skb_dequeue+0x12f/0x180 [ 33.471981] skb_queue_purge+0x19/0x40 [ 33.475950] packet_sock_destruct+0x93/0x290 [ 33.480353] ? packet_mm_close+0xc0/0xc0 [ 33.484390] ? graph_lock+0x170/0x170 [ 33.488171] ? __free_object+0x16e/0x330 [ 33.492218] ? __list_del_entry_valid.cold.1+0x58/0x58 [ 33.497472] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 33.502033] ? packet_mm_close+0xc0/0xc0 [ 33.506133] __sk_destruct+0xff/0xa40 [ 33.509919] ? sock_warn_obsolete_bsdism+0xb0/0xb0 [ 33.514824] ? graph_lock+0x170/0x170 [ 33.518868] ? lock_downgrade+0x8e0/0x8e0 [ 33.522993] ? __lock_is_held+0xb5/0x140 [ 33.527040] ? kasan_check_read+0x11/0x20 [ 33.531166] ? do_raw_spin_unlock+0x9e/0x2e0 [ 33.535560] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 33.540127] ? _raw_spin_unlock_irqrestore+0x74/0xc0 [ 33.545215] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 33.550729] ? refcount_sub_and_test+0x212/0x330 [ 33.555468] ? refcount_inc_not_zero+0x2d0/0x2d0 [ 33.560209] ? refcount_inc_not_zero+0x2d0/0x2d0 [ 33.564949] ? pcpu_free_area+0xa90/0xa90 [ 33.569078] sk_destruct+0x78/0x90 [ 33.572600] __sk_free+0x22e/0x340 [ 33.576119] sk_free+0x42/0x50 [ 33.579289] packet_release+0xa18/0xd50 [ 33.583242] ? lock_downgrade+0x8e0/0x8e0 [ 33.587370] ? packet_lookup_frame+0x270/0x270 [ 33.591953] ? cpumask_weight.constprop.5+0x44/0x44 [ 33.596948] ? do_raw_spin_lock+0xc1/0x200 [ 33.601165] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 33.606853] ? locks_remove_file+0x3f7/0x5a0 [ 33.611246] ? fcntl_setlk+0x1020/0x1020 [ 33.615294] ? fsnotify+0x415/0x1100 [ 33.618997] ? fsnotify_first_mark+0x330/0x330 [ 33.623564] sock_release+0x96/0x1b0 [ 33.627257] ? sock_alloc_file+0x4e0/0x4e0 [ 33.632357] sock_close+0x16/0x20 [ 33.635790] __fput+0x34d/0x890 [ 33.639054] ? fput+0x1a0/0x1a0 [ 33.642316] ? check_same_owner+0x320/0x320 [ 33.646616] ____fput+0x15/0x20 [ 33.649876] task_work_run+0x1e4/0x290 [ 33.653752] ? task_work_cancel+0x240/0x240 [ 33.658057] ? switch_task_namespaces+0xbd/0xd0 [ 33.662704] do_exit+0x1aee/0x2730 [ 33.666243] ? find_held_lock+0x36/0x1c0 [ 33.670294] ? mm_update_next_owner+0x980/0x980 [ 33.674952] ? kasan_check_read+0x11/0x20 [ 33.679076] ? rcu_is_watching+0x85/0x140 [ 33.683217] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 33.688398] ? tun_get+0x22b/0x360 [ 33.691914] ? tun_chr_close+0x60/0x60 [ 33.695784] ? tun_chr_write_iter+0x110/0x154 [ 33.700277] ? fsnotify+0x415/0x1100 [ 33.703977] ? kasan_check_read+0x11/0x20 [ 33.708113] ? rcu_is_watching+0x85/0x140 [ 33.712239] ? rcu_pm_notify+0xc0/0xc0 [ 33.716106] ? vfs_writev+0x255/0x330 [ 33.719895] ? rcu_read_lock_sched_held+0x108/0x120 [ 33.724889] ? kfree+0x1e9/0x260 [ 33.728233] ? vfs_writev+0xfc/0x330 [ 33.731930] ? vfs_iter_write+0xb0/0xb0 [ 33.735886] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 33.741403] ? sockfd_lookup_light+0xc5/0x160 [ 33.745875] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 33.751392] ? __fdget_pos+0xd6/0x1e0 [ 33.755173] ? __fdget_raw+0x20/0x20 [ 33.758866] do_group_exit+0x16f/0x430 [ 33.762733] ? SyS_exit+0x30/0x30 [ 33.766163] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 33.770982] ? do_syscall_64+0xb7/0x9d0 [ 33.774935] ? do_group_exit+0x430/0x430 [ 33.778985] SyS_exit_group+0x1d/0x20 [ 33.782778] do_syscall_64+0x29e/0x9d0 [ 33.786732] ? vmalloc_sync_all+0x30/0x30 [ 33.790857] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 33.795612] ? syscall_return_slowpath+0x5c0/0x5c0 [ 33.800534] ? syscall_return_slowpath+0x30f/0x5c0 [ 33.805442] ? entry_SYSCALL_64_after_hwframe+0x52/0xb7 [ 33.810791] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 33.815617] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 33.820791] RIP: 0033:0x441739 [ 33.823965] RSP: 002b:00007fff0dccca08 EFLAGS: 00000202 ORIG_RAX: 00000000000000e7 [ 33.831664] RAX: ffffffffffffffda RBX: 000000000000001b RCX: 0000000000441739 [ 33.838925] RDX: 0000000000441670 RSI: 0000000000000001 RDI: 0000000000000001 [ 33.846187] RBP: 00000000004a3349 R08: 000000000000000e R09: 00000000006cd018 [ 33.853449] R10: 0000000000000003 R11: 0000000000000202 R12: 00007fff0dcccaf8 [ 33.860732] R13: 00000000004024c0 R14: 0000000000000000 R15: 0000000000000000 [ 33.868583] Dumping ftrace buffer: [ 33.872111] (ftrace buffer empty) [ 33.875801] Kernel Offset: disabled [ 33.879405] Rebooting in 86400 seconds..