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 '10.128.0.58' (ECDSA) to the list of known hosts. net.ipv6.conf.syz_tun.accept_dad = 0 syzkaller login: [ 26.509894] 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 [ 26.770901] 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 [ 27.151726] IPv6: ADDRCONF(NETDEV_UP): bond0: link is not ready [ 27.157846] 8021q: adding VLAN 0 to HW filter on device bond0 [ 27.198744] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 27.239648] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 27.280666] IPv6: ADDRCONF(NETDEV_UP): team0: link is not ready [ 27.286778] 8021q: adding VLAN 0 to HW filter on device team0 [ 27.315736] bond0: Enslaving bond_slave as an active interface with an up link executing program [ 27.325305] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 27.337776] team0: Port device team_slave added [ 27.343203] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 27.385114] ================================================================== [ 27.392561] BUG: KASAN: use-after-free in skb_release_data+0x19b/0x860 [ 27.399211] Write of size 4 at addr ffff8801a9ccc920 by task syzkaller617266/4493 [ 27.406802] [ 27.408414] CPU: 1 PID: 4493 Comm: syzkaller617266 Not tainted 4.16.0+ #17 [ 27.415399] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.424730] Call Trace: [ 27.427309] dump_stack+0x1b9/0x294 [ 27.430947] ? dump_stack_print_info.cold.2+0x52/0x52 [ 27.436118] ? printk+0x9e/0xba [ 27.439377] ? kmsg_dump_rewind_nolock+0xe4/0xe4 [ 27.444113] ? kasan_check_write+0x14/0x20 [ 27.448329] print_address_description+0x6c/0x20b [ 27.453149] ? skb_release_data+0x19b/0x860 [ 27.457448] kasan_report.cold.7+0xac/0x2f5 [ 27.461747] check_memory_region+0x13e/0x1b0 [ 27.466132] kasan_check_write+0x14/0x20 [ 27.470169] skb_release_data+0x19b/0x860 [ 27.474297] ? skb_tx_error+0x2f0/0x2f0 [ 27.478252] ? kasan_check_read+0x11/0x20 [ 27.482376] ? rcu_is_watching+0x85/0x140 [ 27.486502] ? kasan_check_write+0x14/0x20 [ 27.490715] ? sock_rmem_free+0x6f/0x90 [ 27.494666] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 27.500190] skb_release_all+0x4a/0x60 [ 27.504058] kfree_skb+0x195/0x560 [ 27.507573] ? skb_queue_purge+0x19/0x40 [ 27.511612] ? __kfree_skb+0x20/0x20 [ 27.515309] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 27.519873] ? _raw_spin_unlock_irqrestore+0x74/0xc0 [ 27.524953] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 27.529943] ? trace_hardirqs_on+0xd/0x10 [ 27.534071] ? skb_dequeue+0x12f/0x180 [ 27.537935] skb_queue_purge+0x19/0x40 [ 27.541805] packet_sock_destruct+0x93/0x290 [ 27.546190] ? packet_mm_close+0xc0/0xc0 [ 27.550227] ? graph_lock+0x170/0x170 [ 27.554007] ? __free_object+0x16e/0x330 [ 27.558059] ? __list_del_entry_valid.cold.1+0x58/0x58 [ 27.563317] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 27.567877] ? packet_mm_close+0xc0/0xc0 [ 27.571912] __sk_destruct+0xff/0xa40 [ 27.575692] ? sock_warn_obsolete_bsdism+0xb0/0xb0 [ 27.580597] ? graph_lock+0x170/0x170 [ 27.584375] ? lock_downgrade+0x8e0/0x8e0 [ 27.588499] ? __lock_is_held+0xb5/0x140 [ 27.592541] ? kasan_check_read+0x11/0x20 [ 27.596663] ? do_raw_spin_unlock+0x9e/0x2e0 [ 27.601048] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 27.605607] ? _raw_spin_unlock_irqrestore+0x74/0xc0 [ 27.610692] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 27.616206] ? refcount_sub_and_test+0x212/0x330 [ 27.620938] ? refcount_inc_not_zero+0x2d0/0x2d0 [ 27.625670] ? refcount_inc_not_zero+0x2d0/0x2d0 [ 27.630402] ? pcpu_free_area+0xa90/0xa90 [ 27.634526] sk_destruct+0x78/0x90 [ 27.638044] __sk_free+0x22e/0x340 [ 27.641562] sk_free+0x42/0x50 [ 27.644732] packet_release+0xa18/0xd50 [ 27.648680] ? lock_downgrade+0x8e0/0x8e0 [ 27.652809] ? packet_lookup_frame+0x270/0x270 [ 27.657369] ? cpumask_weight.constprop.5+0x44/0x44 [ 27.662361] ? do_raw_spin_lock+0xc1/0x200 [ 27.666593] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 27.672122] ? locks_remove_file+0x3f7/0x5a0 [ 27.676508] ? fcntl_setlk+0x1020/0x1020 [ 27.680546] ? fsnotify+0x415/0x1100 [ 27.684238] ? fsnotify_first_mark+0x330/0x330 [ 27.688801] sock_release+0x96/0x1b0 [ 27.692493] ? sock_alloc_file+0x4e0/0x4e0 [ 27.696701] sock_close+0x16/0x20 [ 27.700130] __fput+0x34d/0x890 [ 27.703390] ? fput+0x1a0/0x1a0 [ 27.706648] ? check_same_owner+0x320/0x320 [ 27.710949] ____fput+0x15/0x20 [ 27.714209] task_work_run+0x1e4/0x290 [ 27.718073] ? task_work_cancel+0x240/0x240 [ 27.722373] ? switch_task_namespaces+0xbd/0xd0 [ 27.727032] do_exit+0x1aee/0x2730 [ 27.730550] ? find_held_lock+0x36/0x1c0 [ 27.734591] ? mm_update_next_owner+0x980/0x980 [ 27.739239] ? kasan_check_read+0x11/0x20 [ 27.743363] ? rcu_is_watching+0x85/0x140 [ 27.747486] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 27.752656] ? tun_get+0x22b/0x360 [ 27.756174] ? tun_chr_close+0x60/0x60 [ 27.760054] ? tun_chr_write_iter+0x110/0x154 [ 27.764530] ? fsnotify+0x415/0x1100 [ 27.768228] ? kasan_check_read+0x11/0x20 [ 27.772353] ? rcu_is_watching+0x85/0x140 [ 27.776475] ? rcu_pm_notify+0xc0/0xc0 [ 27.780344] ? vfs_writev+0x255/0x330 [ 27.784120] ? rcu_read_lock_sched_held+0x108/0x120 [ 27.789111] ? kfree+0x1e9/0x260 [ 27.792454] ? vfs_writev+0xfc/0x330 [ 27.796146] ? vfs_iter_write+0xb0/0xb0 [ 27.800103] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 27.805617] ? sockfd_lookup_light+0xc5/0x160 [ 27.810089] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 27.815602] ? __fdget_pos+0xd6/0x1e0 [ 27.819379] ? __fdget_raw+0x20/0x20 [ 27.823076] do_group_exit+0x16f/0x430 [ 27.826941] ? SyS_exit+0x30/0x30 [ 27.830373] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 27.835193] ? do_syscall_64+0xb7/0x9d0 [ 27.839145] ? do_group_exit+0x430/0x430 [ 27.843184] SyS_exit_group+0x1d/0x20 [ 27.846960] do_syscall_64+0x29e/0x9d0 [ 27.850826] ? vmalloc_sync_all+0x30/0x30 [ 27.854950] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 27.859685] ? syscall_return_slowpath+0x5c0/0x5c0 [ 27.864591] ? syscall_return_slowpath+0x30f/0x5c0 [ 27.869503] ? entry_SYSCALL_64_after_hwframe+0x52/0xb7 [ 27.874852] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 27.879681] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 27.884846] RIP: 0033:0x441819 [ 27.888017] RSP: 002b:00007ffd7ef6be78 EFLAGS: 00000202 ORIG_RAX: 00000000000000e7 [ 27.895710] RAX: ffffffffffffffda RBX: 000000000000001b RCX: 0000000000441819 [ 27.902952] RDX: 0000000000441750 RSI: 0000000000000001 RDI: 0000000000000001 [ 27.910198] RBP: 00000000004a3429 R08: 0000000000f206b0 R09: 00000000006cd018 [ 27.917443] R10: 0000000000000100 R11: 0000000000000202 R12: 00007ffd7ef6bf88 [ 27.924689] R13: 00000000004025a0 R14: 0000000000000000 R15: 0000000000000000 [ 27.931941] [ 27.933546] Allocated by task 4493: [ 27.937153] save_stack+0x43/0xd0 [ 27.940582] kasan_kmalloc+0xc4/0xe0 [ 27.944271] __kmalloc_node_track_caller+0x47/0x70 [ 27.949180] __kmalloc_reserve.isra.38+0x3a/0xe0 [ 27.953913] __alloc_skb+0x14d/0x780 [ 27.957601] alloc_skb_with_frags+0x137/0x760 [ 27.962071] sock_alloc_send_pskb+0x87a/0xae0 [ 27.966544] packet_sendmsg+0x1bd1/0x6100 [ 27.970668] sock_sendmsg+0xd5/0x120 [ 27.974356] ___sys_sendmsg+0x805/0x940 [ 27.978304] __sys_sendmsg+0x115/0x270 [ 27.982167] SyS_sendmsg+0x29/0x30 [ 27.985682] do_syscall_64+0x29e/0x9d0 [ 27.989549] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 27.994706] [ 27.996307] Freed by task 4493: [ 27.999561] save_stack+0x43/0xd0 [ 28.002989] __kasan_slab_free+0x11a/0x170 [ 28.007201] kasan_slab_free+0xe/0x10 [ 28.010975] kfree+0xd9/0x260 [ 28.014059] skb_free_head+0x99/0xc0 [ 28.017749] skb_release_data+0x690/0x860 [ 28.021875] skb_release_all+0x4a/0x60 [ 28.025737] kfree_skb+0x195/0x560 [ 28.029260] ip6_tnl_start_xmit+0xa44/0x2290 [ 28.033654] dev_hard_start_xmit+0x264/0xc10 [ 28.038040] __dev_queue_xmit+0x2724/0x34c0 [ 28.042335] dev_queue_xmit+0x17/0x20 [ 28.046113] packet_sendmsg+0x411d/0x6100 [ 28.050239] sock_sendmsg+0xd5/0x120 [ 28.053929] ___sys_sendmsg+0x805/0x940 [ 28.057878] __sys_sendmsg+0x115/0x270 [ 28.061738] SyS_sendmsg+0x29/0x30 [ 28.065257] do_syscall_64+0x29e/0x9d0 [ 28.069120] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 28.074279] [ 28.075884] The buggy address belongs to the object at ffff8801a9ccc840 [ 28.075884] which belongs to the cache kmalloc-512 of size 512 [ 28.088518] The buggy address is located 224 bytes inside of [ 28.088518] 512-byte region [ffff8801a9ccc840, ffff8801a9ccca40) [ 28.100363] The buggy address belongs to the page: [ 28.105269] page:ffffea0006a73300 count:1 mapcount:0 mapping:ffff8801a9ccc0c0 index:0x0 [ 28.113387] flags: 0x2fffc0000000100(slab) [ 28.117600] raw: 02fffc0000000100 ffff8801a9ccc0c0 0000000000000000 0000000100000006 [ 28.125461] raw: ffffea0006a70c60 ffff8801dac01748 ffff8801dac00940 0000000000000000 [ 28.133313] page dumped because: kasan: bad access detected [ 28.138993] [ 28.140596] Memory state around the buggy address: [ 28.145502] ffff8801a9ccc800: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb [ 28.152834] ffff8801a9ccc880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 28.160171] >ffff8801a9ccc900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 28.167504] ^ [ 28.171885] ffff8801a9ccc980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 28.179219] ffff8801a9ccca00: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 28.186549] ================================================================== [ 28.193878] Disabling lock debugging due to kernel taint [ 28.199650] Kernel panic - not syncing: panic_on_warn set ... [ 28.199650] [ 28.207016] CPU: 1 PID: 4493 Comm: syzkaller617266 Tainted: G B 4.16.0+ #17 [ 28.215313] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.224638] Call Trace: [ 28.227208] dump_stack+0x1b9/0x294 [ 28.230812] ? dump_stack_print_info.cold.2+0x52/0x52 [ 28.235978] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 28.240708] ? skb_release_data+0xd0/0x860 [ 28.244916] panic+0x22f/0x4de [ 28.248085] ? add_taint.cold.5+0x16/0x16 [ 28.252208] ? do_raw_spin_unlock+0x9e/0x2e0 [ 28.256601] ? do_raw_spin_unlock+0x9e/0x2e0 [ 28.260985] ? skb_release_data+0x19b/0x860 [ 28.265283] kasan_end_report+0x47/0x4f [ 28.269232] kasan_report.cold.7+0xc9/0x2f5 [ 28.273529] check_memory_region+0x13e/0x1b0 [ 28.277912] kasan_check_write+0x14/0x20 [ 28.281946] skb_release_data+0x19b/0x860 [ 28.286071] ? skb_tx_error+0x2f0/0x2f0 [ 28.290027] ? kasan_check_read+0x11/0x20 [ 28.294152] ? rcu_is_watching+0x85/0x140 [ 28.298273] ? kasan_check_write+0x14/0x20 [ 28.302483] ? sock_rmem_free+0x6f/0x90 [ 28.306433] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 28.311947] skb_release_all+0x4a/0x60 [ 28.315808] kfree_skb+0x195/0x560 [ 28.319322] ? skb_queue_purge+0x19/0x40 [ 28.323358] ? __kfree_skb+0x20/0x20 [ 28.327048] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 28.331615] ? _raw_spin_unlock_irqrestore+0x74/0xc0 [ 28.336692] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 28.341679] ? trace_hardirqs_on+0xd/0x10 [ 28.345803] ? skb_dequeue+0x12f/0x180 [ 28.349662] skb_queue_purge+0x19/0x40 [ 28.353524] packet_sock_destruct+0x93/0x290 [ 28.357904] ? packet_mm_close+0xc0/0xc0 [ 28.361938] ? graph_lock+0x170/0x170 [ 28.365714] ? __free_object+0x16e/0x330 [ 28.369751] ? __list_del_entry_valid.cold.1+0x58/0x58 [ 28.375016] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 28.379581] ? packet_mm_close+0xc0/0xc0 [ 28.383617] __sk_destruct+0xff/0xa40 [ 28.387403] ? sock_warn_obsolete_bsdism+0xb0/0xb0 [ 28.392310] ? graph_lock+0x170/0x170 [ 28.396085] ? lock_downgrade+0x8e0/0x8e0 [ 28.400205] ? __lock_is_held+0xb5/0x140 [ 28.404241] ? kasan_check_read+0x11/0x20 [ 28.408364] ? do_raw_spin_unlock+0x9e/0x2e0 [ 28.412745] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 28.417304] ? _raw_spin_unlock_irqrestore+0x74/0xc0 [ 28.422387] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 28.427898] ? refcount_sub_and_test+0x212/0x330 [ 28.432628] ? refcount_inc_not_zero+0x2d0/0x2d0 [ 28.437356] ? refcount_inc_not_zero+0x2d0/0x2d0 [ 28.442085] ? pcpu_free_area+0xa90/0xa90 [ 28.446207] sk_destruct+0x78/0x90 [ 28.449725] __sk_free+0x22e/0x340 [ 28.453241] sk_free+0x42/0x50 [ 28.456409] packet_release+0xa18/0xd50 [ 28.460356] ? lock_downgrade+0x8e0/0x8e0 [ 28.464478] ? packet_lookup_frame+0x270/0x270 [ 28.469039] ? cpumask_weight.constprop.5+0x44/0x44 [ 28.474034] ? do_raw_spin_lock+0xc1/0x200 [ 28.478247] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 28.483759] ? locks_remove_file+0x3f7/0x5a0 [ 28.488142] ? fcntl_setlk+0x1020/0x1020 [ 28.492176] ? fsnotify+0x415/0x1100 [ 28.495866] ? fsnotify_first_mark+0x330/0x330 [ 28.500422] sock_release+0x96/0x1b0 [ 28.504112] ? sock_alloc_file+0x4e0/0x4e0 [ 28.508321] sock_close+0x16/0x20 [ 28.511750] __fput+0x34d/0x890 [ 28.515007] ? fput+0x1a0/0x1a0 [ 28.518270] ? check_same_owner+0x320/0x320 [ 28.522574] ____fput+0x15/0x20 [ 28.525829] task_work_run+0x1e4/0x290 [ 28.529692] ? task_work_cancel+0x240/0x240 [ 28.533994] ? switch_task_namespaces+0xbd/0xd0 [ 28.538641] do_exit+0x1aee/0x2730 [ 28.542161] ? find_held_lock+0x36/0x1c0 [ 28.546202] ? mm_update_next_owner+0x980/0x980 [ 28.550847] ? kasan_check_read+0x11/0x20 [ 28.554972] ? rcu_is_watching+0x85/0x140 [ 28.559094] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 28.564261] ? tun_get+0x22b/0x360 [ 28.567774] ? tun_chr_close+0x60/0x60 [ 28.571641] ? tun_chr_write_iter+0x110/0x154 [ 28.576111] ? fsnotify+0x415/0x1100 [ 28.579802] ? kasan_check_read+0x11/0x20 [ 28.583924] ? rcu_is_watching+0x85/0x140 [ 28.588045] ? rcu_pm_notify+0xc0/0xc0 [ 28.591907] ? vfs_writev+0x255/0x330 [ 28.595691] ? rcu_read_lock_sched_held+0x108/0x120 [ 28.600686] ? kfree+0x1e9/0x260 [ 28.604041] ? vfs_writev+0xfc/0x330 [ 28.607735] ? vfs_iter_write+0xb0/0xb0 [ 28.611688] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 28.617203] ? sockfd_lookup_light+0xc5/0x160 [ 28.621672] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 28.627195] ? __fdget_pos+0xd6/0x1e0 [ 28.630970] ? __fdget_raw+0x20/0x20 [ 28.634661] do_group_exit+0x16f/0x430 [ 28.638524] ? SyS_exit+0x30/0x30 [ 28.641952] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 28.646769] ? do_syscall_64+0xb7/0x9d0 [ 28.650720] ? do_group_exit+0x430/0x430 [ 28.654757] SyS_exit_group+0x1d/0x20 [ 28.658532] do_syscall_64+0x29e/0x9d0 [ 28.662394] ? vmalloc_sync_all+0x30/0x30 [ 28.666516] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 28.671246] ? syscall_return_slowpath+0x5c0/0x5c0 [ 28.676152] ? syscall_return_slowpath+0x30f/0x5c0 [ 28.681057] ? entry_SYSCALL_64_after_hwframe+0x52/0xb7 [ 28.686397] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 28.691218] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 28.696381] RIP: 0033:0x441819 [ 28.699544] RSP: 002b:00007ffd7ef6be78 EFLAGS: 00000202 ORIG_RAX: 00000000000000e7 [ 28.707226] RAX: ffffffffffffffda RBX: 000000000000001b RCX: 0000000000441819 [ 28.714469] RDX: 0000000000441750 RSI: 0000000000000001 RDI: 0000000000000001 [ 28.721714] RBP: 00000000004a3429 R08: 0000000000f206b0 R09: 00000000006cd018 [ 28.728955] R10: 0000000000000100 R11: 0000000000000202 R12: 00007ffd7ef6bf88 [ 28.736197] R13: 00000000004025a0 R14: 0000000000000000 R15: 0000000000000000 [ 28.743854] Dumping ftrace buffer: [ 28.747366] (ftrace buffer empty) [ 28.751050] Kernel Offset: disabled [ 28.754650] Rebooting in 86400 seconds..