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 '10.128.0.54' (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: [ 29.579980] IPVS: ftp: loaded support on port[0] = 21 RTNETLINK answers: Operation not supported RTNETLINK answers: No buffer space available RTNETLINK answers: Operation not supported [ 29.837237] 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 [ 30.204230] IPv6: ADDRCONF(NETDEV_UP): bond0: link is not ready [ 30.210340] 8021q: adding VLAN 0 to HW filter on device bond0 [ 30.249809] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 30.288453] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 30.333415] IPv6: ADDRCONF(NETDEV_UP): team0: link is not ready [ 30.339522] 8021q: adding VLAN 0 to HW filter on device team0 [ 30.366573] bond0: Enslaving bond_slave as an active interface with an up link [ 30.374827] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready executing program [ 30.391545] team0: Port device team_slave added [ 30.396764] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 30.432121] ================================================================== [ 30.439550] BUG: KASAN: use-after-free in skb_release_data+0x19b/0x860 [ 30.446196] Write of size 4 at addr ffff8801b1bd0120 by task syzkaller931210/4501 [ 30.453789] [ 30.455401] CPU: 0 PID: 4501 Comm: syzkaller931210 Not tainted 4.16.0+ #17 [ 30.462395] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.471723] Call Trace: [ 30.474302] dump_stack+0x1b9/0x294 [ 30.477909] ? dump_stack_print_info.cold.2+0x52/0x52 [ 30.483079] ? printk+0x9e/0xba [ 30.486339] ? kmsg_dump_rewind_nolock+0xe4/0xe4 [ 30.491078] ? kasan_check_write+0x14/0x20 [ 30.495294] print_address_description+0x6c/0x20b [ 30.500114] ? skb_release_data+0x19b/0x860 [ 30.504414] kasan_report.cold.7+0xac/0x2f5 [ 30.508718] check_memory_region+0x13e/0x1b0 [ 30.513107] kasan_check_write+0x14/0x20 [ 30.517154] skb_release_data+0x19b/0x860 [ 30.521283] ? skb_tx_error+0x2f0/0x2f0 [ 30.525236] ? kasan_check_read+0x11/0x20 [ 30.529362] ? rcu_is_watching+0x85/0x140 [ 30.533498] ? kasan_check_write+0x14/0x20 [ 30.537709] ? sock_rmem_free+0x6f/0x90 [ 30.541665] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 30.547184] skb_release_all+0x4a/0x60 [ 30.551053] kfree_skb+0x195/0x560 [ 30.554572] ? skb_queue_purge+0x19/0x40 [ 30.558612] ? __kfree_skb+0x20/0x20 [ 30.562306] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 30.566866] ? _raw_spin_unlock_irqrestore+0x74/0xc0 [ 30.571973] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 30.576970] ? trace_hardirqs_on+0xd/0x10 [ 30.581099] ? skb_dequeue+0x12f/0x180 [ 30.584976] skb_queue_purge+0x19/0x40 [ 30.588844] packet_sock_destruct+0x93/0x290 [ 30.593232] ? packet_mm_close+0xc0/0xc0 [ 30.597270] ? graph_lock+0x170/0x170 [ 30.601049] ? __free_object+0x16e/0x330 [ 30.605090] ? __list_del_entry_valid.cold.1+0x58/0x58 [ 30.610345] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 30.614907] ? packet_mm_close+0xc0/0xc0 [ 30.618969] __sk_destruct+0xff/0xa40 [ 30.622760] ? sock_warn_obsolete_bsdism+0xb0/0xb0 [ 30.627667] ? graph_lock+0x170/0x170 [ 30.631447] ? lock_downgrade+0x8e0/0x8e0 [ 30.635573] ? __lock_is_held+0xb5/0x140 [ 30.639615] ? kasan_check_read+0x11/0x20 [ 30.643742] ? do_raw_spin_unlock+0x9e/0x2e0 [ 30.648139] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 30.652702] ? _raw_spin_unlock_irqrestore+0x74/0xc0 [ 30.657790] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 30.663305] ? refcount_sub_and_test+0x212/0x330 [ 30.668041] ? refcount_inc_not_zero+0x2d0/0x2d0 [ 30.672778] ? refcount_inc_not_zero+0x2d0/0x2d0 [ 30.677517] ? pcpu_free_area+0xa90/0xa90 [ 30.681645] sk_destruct+0x78/0x90 [ 30.685164] __sk_free+0x22e/0x340 [ 30.688683] sk_free+0x42/0x50 [ 30.691855] packet_release+0xa18/0xd50 [ 30.695808] ? lock_downgrade+0x8e0/0x8e0 [ 30.699944] ? packet_lookup_frame+0x270/0x270 [ 30.704507] ? cpumask_weight.constprop.5+0x44/0x44 [ 30.709503] ? do_raw_spin_lock+0xc1/0x200 [ 30.713718] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 30.719234] ? locks_remove_file+0x3f7/0x5a0 [ 30.723619] ? fcntl_setlk+0x1020/0x1020 [ 30.727658] ? fsnotify+0x415/0x1100 [ 30.731354] ? fsnotify_first_mark+0x330/0x330 [ 30.735917] sock_release+0x96/0x1b0 [ 30.739623] ? sock_alloc_file+0x4e0/0x4e0 [ 30.743852] sock_close+0x16/0x20 [ 30.747286] __fput+0x34d/0x890 [ 30.750546] ? fput+0x1a0/0x1a0 [ 30.753805] ? check_same_owner+0x320/0x320 [ 30.758116] ____fput+0x15/0x20 [ 30.761380] task_work_run+0x1e4/0x290 [ 30.765248] ? task_work_cancel+0x240/0x240 [ 30.769556] ? switch_task_namespaces+0xbd/0xd0 [ 30.774206] do_exit+0x1aee/0x2730 [ 30.777726] ? find_held_lock+0x36/0x1c0 [ 30.781769] ? mm_update_next_owner+0x980/0x980 [ 30.786422] ? kasan_check_read+0x11/0x20 [ 30.790548] ? rcu_is_watching+0x85/0x140 [ 30.794675] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 30.799849] ? tun_get+0x22b/0x360 [ 30.803367] ? tun_chr_close+0x60/0x60 [ 30.807237] ? tun_chr_write_iter+0x110/0x154 [ 30.811711] ? fsnotify+0x415/0x1100 [ 30.815411] ? kasan_check_read+0x11/0x20 [ 30.819539] ? rcu_is_watching+0x85/0x140 [ 30.823666] ? rcu_pm_notify+0xc0/0xc0 [ 30.827537] ? vfs_writev+0x255/0x330 [ 30.831315] ? rcu_read_lock_sched_held+0x108/0x120 [ 30.836310] ? kfree+0x1e9/0x260 [ 30.839655] ? vfs_writev+0xfc/0x330 [ 30.843347] ? vfs_iter_write+0xb0/0xb0 [ 30.847308] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 30.852823] ? sockfd_lookup_light+0xc5/0x160 [ 30.857298] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 30.862813] ? __fdget_pos+0xd6/0x1e0 [ 30.866592] ? __fdget_raw+0x20/0x20 [ 30.870289] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 30.875815] ? __sys_setsockopt+0x24f/0x390 [ 30.880118] do_group_exit+0x16f/0x430 [ 30.883991] ? SyS_exit+0x30/0x30 [ 30.887435] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 30.892255] ? do_syscall_64+0xb7/0x9d0 [ 30.896206] ? do_group_exit+0x430/0x430 [ 30.900247] SyS_exit_group+0x1d/0x20 [ 30.904033] do_syscall_64+0x29e/0x9d0 [ 30.907900] ? vmalloc_sync_all+0x30/0x30 [ 30.912034] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 30.916769] ? syscall_return_slowpath+0x5c0/0x5c0 [ 30.921681] ? syscall_return_slowpath+0x30f/0x5c0 [ 30.926590] ? entry_SYSCALL_64_after_hwframe+0x52/0xb7 [ 30.931941] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 30.936767] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 30.941937] RIP: 0033:0x441899 [ 30.945103] RSP: 002b:00007ffd6abeebe8 EFLAGS: 00000206 ORIG_RAX: 00000000000000e7 [ 30.952796] RAX: ffffffffffffffda RBX: 000000000000001b RCX: 0000000000441899 [ 30.960046] RDX: 00000000004417d0 RSI: 0000000000000001 RDI: 0000000000000001 [ 30.967313] RBP: 00000000004a34a9 R08: 0000000000000000 R09: 00000000006cd018 [ 30.974567] R10: 0000000000000000 R11: 0000000000000206 R12: 00007ffd6abeecd8 [ 30.981821] R13: 0000000000402620 R14: 0000000000000000 R15: 0000000000000000 [ 30.989075] [ 30.990679] Allocated by task 4501: [ 30.994286] save_stack+0x43/0xd0 [ 30.997716] kasan_kmalloc+0xc4/0xe0 [ 31.001407] __kmalloc_node_track_caller+0x47/0x70 [ 31.006318] __kmalloc_reserve.isra.38+0x3a/0xe0 [ 31.011051] __alloc_skb+0x14d/0x780 [ 31.014741] alloc_skb_with_frags+0x137/0x760 [ 31.019214] sock_alloc_send_pskb+0x87a/0xae0 [ 31.023689] packet_sendmsg+0x1bd1/0x6100 [ 31.027814] sock_sendmsg+0xd5/0x120 [ 31.031506] ___sys_sendmsg+0x805/0x940 [ 31.035463] __sys_sendmsg+0x115/0x270 [ 31.039325] SyS_sendmsg+0x29/0x30 [ 31.042845] do_syscall_64+0x29e/0x9d0 [ 31.046717] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 31.051879] [ 31.053482] Freed by task 4501: [ 31.056738] save_stack+0x43/0xd0 [ 31.060168] __kasan_slab_free+0x11a/0x170 [ 31.064379] kasan_slab_free+0xe/0x10 [ 31.068154] kfree+0xd9/0x260 [ 31.071236] skb_free_head+0x99/0xc0 [ 31.074929] skb_release_data+0x690/0x860 [ 31.079052] skb_release_all+0x4a/0x60 [ 31.082923] kfree_skb+0x195/0x560 [ 31.086444] ip6_tnl_start_xmit+0xa44/0x2290 [ 31.090829] dev_hard_start_xmit+0x264/0xc10 [ 31.095213] __dev_queue_xmit+0x2724/0x34c0 [ 31.099511] dev_queue_xmit+0x17/0x20 [ 31.103289] packet_sendmsg+0x411d/0x6100 [ 31.107421] sock_sendmsg+0xd5/0x120 [ 31.111110] ___sys_sendmsg+0x805/0x940 [ 31.115060] __sys_sendmsg+0x115/0x270 [ 31.118936] SyS_sendmsg+0x29/0x30 [ 31.122454] do_syscall_64+0x29e/0x9d0 [ 31.126321] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 31.131480] [ 31.133084] The buggy address belongs to the object at ffff8801b1bd0040 [ 31.133084] which belongs to the cache kmalloc-512 of size 512 [ 31.145717] The buggy address is located 224 bytes inside of [ 31.145717] 512-byte region [ffff8801b1bd0040, ffff8801b1bd0240) [ 31.157566] The buggy address belongs to the page: [ 31.162475] page:ffffea0006c6f400 count:1 mapcount:0 mapping:ffff8801b1bd0040 index:0x0 [ 31.170594] flags: 0x2fffc0000000100(slab) [ 31.174807] raw: 02fffc0000000100 ffff8801b1bd0040 0000000000000000 0000000100000006 [ 31.182666] raw: ffffea0006dc29e0 ffffea000762afa0 ffff8801dac00940 0000000000000000 [ 31.190521] page dumped because: kasan: bad access detected [ 31.196204] [ 31.197809] Memory state around the buggy address: [ 31.202715] ffff8801b1bd0000: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb [ 31.210566] ffff8801b1bd0080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 31.217904] >ffff8801b1bd0100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 31.225243] ^ [ 31.229627] ffff8801b1bd0180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 31.236964] ffff8801b1bd0200: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 31.244301] ================================================================== [ 31.251633] Disabling lock debugging due to kernel taint [ 31.257463] Kernel panic - not syncing: panic_on_warn set ... [ 31.257463] [ 31.264837] CPU: 0 PID: 4501 Comm: syzkaller931210 Tainted: G B 4.16.0+ #17 [ 31.273139] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.282467] Call Trace: [ 31.285035] dump_stack+0x1b9/0x294 [ 31.288641] ? dump_stack_print_info.cold.2+0x52/0x52 [ 31.293808] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 31.298541] ? skb_release_data+0xd0/0x860 [ 31.302768] panic+0x22f/0x4de [ 31.305936] ? add_taint.cold.5+0x16/0x16 [ 31.310063] ? do_raw_spin_unlock+0x9e/0x2e0 [ 31.314446] ? do_raw_spin_unlock+0x9e/0x2e0 [ 31.318831] ? skb_release_data+0x19b/0x860 [ 31.323132] kasan_end_report+0x47/0x4f [ 31.327084] kasan_report.cold.7+0xc9/0x2f5 [ 31.331382] check_memory_region+0x13e/0x1b0 [ 31.335765] kasan_check_write+0x14/0x20 [ 31.339799] skb_release_data+0x19b/0x860 [ 31.343921] ? skb_tx_error+0x2f0/0x2f0 [ 31.347871] ? kasan_check_read+0x11/0x20 [ 31.351994] ? rcu_is_watching+0x85/0x140 [ 31.356121] ? kasan_check_write+0x14/0x20 [ 31.360330] ? sock_rmem_free+0x6f/0x90 [ 31.364282] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 31.369794] skb_release_all+0x4a/0x60 [ 31.373666] kfree_skb+0x195/0x560 [ 31.377182] ? skb_queue_purge+0x19/0x40 [ 31.381220] ? __kfree_skb+0x20/0x20 [ 31.384921] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 31.389482] ? _raw_spin_unlock_irqrestore+0x74/0xc0 [ 31.394563] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 31.399554] ? trace_hardirqs_on+0xd/0x10 [ 31.403679] ? skb_dequeue+0x12f/0x180 [ 31.407628] skb_queue_purge+0x19/0x40 [ 31.411496] packet_sock_destruct+0x93/0x290 [ 31.415886] ? packet_mm_close+0xc0/0xc0 [ 31.419938] ? graph_lock+0x170/0x170 [ 31.423713] ? __free_object+0x16e/0x330 [ 31.427752] ? __list_del_entry_valid.cold.1+0x58/0x58 [ 31.433007] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 31.437573] ? packet_mm_close+0xc0/0xc0 [ 31.441611] __sk_destruct+0xff/0xa40 [ 31.445389] ? sock_warn_obsolete_bsdism+0xb0/0xb0 [ 31.450294] ? graph_lock+0x170/0x170 [ 31.454072] ? lock_downgrade+0x8e0/0x8e0 [ 31.458195] ? __lock_is_held+0xb5/0x140 [ 31.462233] ? kasan_check_read+0x11/0x20 [ 31.466358] ? do_raw_spin_unlock+0x9e/0x2e0 [ 31.470740] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 31.475300] ? _raw_spin_unlock_irqrestore+0x74/0xc0 [ 31.480382] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.485902] ? refcount_sub_and_test+0x212/0x330 [ 31.490633] ? refcount_inc_not_zero+0x2d0/0x2d0 [ 31.495365] ? refcount_inc_not_zero+0x2d0/0x2d0 [ 31.500097] ? pcpu_free_area+0xa90/0xa90 [ 31.504220] sk_destruct+0x78/0x90 [ 31.507737] __sk_free+0x22e/0x340 [ 31.511253] sk_free+0x42/0x50 [ 31.514431] packet_release+0xa18/0xd50 [ 31.518380] ? lock_downgrade+0x8e0/0x8e0 [ 31.522505] ? packet_lookup_frame+0x270/0x270 [ 31.527067] ? cpumask_weight.constprop.5+0x44/0x44 [ 31.532060] ? do_raw_spin_lock+0xc1/0x200 [ 31.536274] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 31.541788] ? locks_remove_file+0x3f7/0x5a0 [ 31.546174] ? fcntl_setlk+0x1020/0x1020 [ 31.550214] ? fsnotify+0x415/0x1100 [ 31.553913] ? fsnotify_first_mark+0x330/0x330 [ 31.558472] sock_release+0x96/0x1b0 [ 31.562164] ? sock_alloc_file+0x4e0/0x4e0 [ 31.566374] sock_close+0x16/0x20 [ 31.569802] __fput+0x34d/0x890 [ 31.573056] ? fput+0x1a0/0x1a0 [ 31.576313] ? check_same_owner+0x320/0x320 [ 31.580609] ____fput+0x15/0x20 [ 31.583864] task_work_run+0x1e4/0x290 [ 31.587728] ? task_work_cancel+0x240/0x240 [ 31.592033] ? switch_task_namespaces+0xbd/0xd0 [ 31.596680] do_exit+0x1aee/0x2730 [ 31.600197] ? find_held_lock+0x36/0x1c0 [ 31.604237] ? mm_update_next_owner+0x980/0x980 [ 31.608888] ? kasan_check_read+0x11/0x20 [ 31.613020] ? rcu_is_watching+0x85/0x140 [ 31.617165] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 31.622339] ? tun_get+0x22b/0x360 [ 31.625855] ? tun_chr_close+0x60/0x60 [ 31.629721] ? tun_chr_write_iter+0x110/0x154 [ 31.634195] ? fsnotify+0x415/0x1100 [ 31.637894] ? kasan_check_read+0x11/0x20 [ 31.642023] ? rcu_is_watching+0x85/0x140 [ 31.646147] ? rcu_pm_notify+0xc0/0xc0 [ 31.650023] ? vfs_writev+0x255/0x330 [ 31.653801] ? rcu_read_lock_sched_held+0x108/0x120 [ 31.658798] ? kfree+0x1e9/0x260 [ 31.662141] ? vfs_writev+0xfc/0x330 [ 31.665833] ? vfs_iter_write+0xb0/0xb0 [ 31.669788] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 31.675302] ? sockfd_lookup_light+0xc5/0x160 [ 31.679772] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.685285] ? __fdget_pos+0xd6/0x1e0 [ 31.689063] ? __fdget_raw+0x20/0x20 [ 31.692754] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.698267] ? __sys_setsockopt+0x24f/0x390 [ 31.702567] do_group_exit+0x16f/0x430 [ 31.706431] ? SyS_exit+0x30/0x30 [ 31.709861] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 31.714683] ? do_syscall_64+0xb7/0x9d0 [ 31.718638] ? do_group_exit+0x430/0x430 [ 31.722676] SyS_exit_group+0x1d/0x20 [ 31.726452] do_syscall_64+0x29e/0x9d0 [ 31.730314] ? vmalloc_sync_all+0x30/0x30 [ 31.734445] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 31.739178] ? syscall_return_slowpath+0x5c0/0x5c0 [ 31.744084] ? syscall_return_slowpath+0x30f/0x5c0 [ 31.748991] ? entry_SYSCALL_64_after_hwframe+0x52/0xb7 [ 31.754340] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 31.759162] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 31.764326] RIP: 0033:0x441899 [ 31.767490] RSP: 002b:00007ffd6abeebe8 EFLAGS: 00000206 ORIG_RAX: 00000000000000e7 [ 31.775172] RAX: ffffffffffffffda RBX: 000000000000001b RCX: 0000000000441899 [ 31.782416] RDX: 00000000004417d0 RSI: 0000000000000001 RDI: 0000000000000001 [ 31.789660] RBP: 00000000004a34a9 R08: 0000000000000000 R09: 00000000006cd018 [ 31.796903] R10: 0000000000000000 R11: 0000000000000206 R12: 00007ffd6abeecd8 [ 31.804149] R13: 0000000000402620 R14: 0000000000000000 R15: 0000000000000000 [ 31.811860] Dumping ftrace buffer: [ 31.815379] (ftrace buffer empty) [ 31.819065] Kernel Offset: disabled [ 31.822666] Rebooting in 86400 seconds..