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 '10.128.0.47' (ECDSA) to the list of known hosts. net.ipv6.conf.syz_tun.accept_dad = 0 syzkaller login: [ 30.259502] 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 [ 30.532428] 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 [ 30.920651] IPv6: ADDRCONF(NETDEV_UP): bond0: link is not ready [ 30.926773] 8021q: adding VLAN 0 to HW filter on device bond0 [ 30.969164] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 31.010848] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 31.053380] IPv6: ADDRCONF(NETDEV_UP): team0: link is not ready [ 31.059526] 8021q: adding VLAN 0 to HW filter on device team0 [ 31.088630] bond0: Enslaving bond_slave as an active interface with an up link [ 31.097092] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready executing program [ 31.114379] team0: Port device team_slave added [ 31.119723] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 31.163159] ================================================================== [ 31.170637] BUG: KASAN: use-after-free in skb_release_data+0x19b/0x860 [ 31.177287] Write of size 4 at addr ffff8801d46328e0 by task syzkaller082227/4502 [ 31.184877] [ 31.186488] CPU: 0 PID: 4502 Comm: syzkaller082227 Not tainted 4.16.0+ #17 [ 31.193472] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.202799] Call Trace: [ 31.205367] dump_stack+0x1b9/0x294 [ 31.208988] ? dump_stack_print_info.cold.2+0x52/0x52 [ 31.214164] ? printk+0x9e/0xba [ 31.217429] ? kmsg_dump_rewind_nolock+0xe4/0xe4 [ 31.222166] ? kasan_check_write+0x14/0x20 [ 31.226408] print_address_description+0x6c/0x20b [ 31.231229] ? skb_release_data+0x19b/0x860 [ 31.235532] kasan_report.cold.7+0xac/0x2f5 [ 31.239833] check_memory_region+0x13e/0x1b0 [ 31.244225] kasan_check_write+0x14/0x20 [ 31.248265] skb_release_data+0x19b/0x860 [ 31.252404] ? skb_tx_error+0x2f0/0x2f0 [ 31.256355] ? kasan_check_read+0x11/0x20 [ 31.260482] ? rcu_is_watching+0x85/0x140 [ 31.264607] ? kasan_check_write+0x14/0x20 [ 31.268823] ? sock_rmem_free+0x6f/0x90 [ 31.272779] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 31.278295] skb_release_all+0x4a/0x60 [ 31.282167] kfree_skb+0x195/0x560 [ 31.285684] ? skb_queue_purge+0x19/0x40 [ 31.289731] ? __kfree_skb+0x20/0x20 [ 31.293424] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 31.298074] ? _raw_spin_unlock_irqrestore+0x74/0xc0 [ 31.304284] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 31.309281] ? trace_hardirqs_on+0xd/0x10 [ 31.313410] ? skb_dequeue+0x12f/0x180 [ 31.317276] skb_queue_purge+0x19/0x40 [ 31.321144] packet_sock_destruct+0x93/0x290 [ 31.325529] ? packet_mm_close+0xc0/0xc0 [ 31.329582] ? graph_lock+0x170/0x170 [ 31.333364] ? __free_object+0x16e/0x330 [ 31.337405] ? __list_del_entry_valid.cold.1+0x58/0x58 [ 31.342662] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 31.347221] ? packet_mm_close+0xc0/0xc0 [ 31.351257] __sk_destruct+0xff/0xa40 [ 31.355041] ? sock_warn_obsolete_bsdism+0xb0/0xb0 [ 31.359949] ? graph_lock+0x170/0x170 [ 31.363736] ? lock_downgrade+0x8e0/0x8e0 [ 31.367862] ? __lock_is_held+0xb5/0x140 [ 31.371902] ? kasan_check_read+0x11/0x20 [ 31.376033] ? do_raw_spin_unlock+0x9e/0x2e0 [ 31.380419] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 31.384989] ? _raw_spin_unlock_irqrestore+0x74/0xc0 [ 31.390077] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.395600] ? refcount_sub_and_test+0x212/0x330 [ 31.400335] ? refcount_inc_not_zero+0x2d0/0x2d0 [ 31.405067] ? refcount_inc_not_zero+0x2d0/0x2d0 [ 31.409802] ? pcpu_free_area+0xa90/0xa90 [ 31.413930] sk_destruct+0x78/0x90 [ 31.417447] __sk_free+0x22e/0x340 [ 31.420964] sk_free+0x42/0x50 [ 31.424133] packet_release+0xa18/0xd50 [ 31.428082] ? lock_downgrade+0x8e0/0x8e0 [ 31.432215] ? packet_lookup_frame+0x270/0x270 [ 31.436780] ? cpumask_weight.constprop.5+0x44/0x44 [ 31.441777] ? do_raw_spin_lock+0xc1/0x200 [ 31.445995] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 31.451521] ? locks_remove_file+0x3f7/0x5a0 [ 31.455914] ? fcntl_setlk+0x1020/0x1020 [ 31.459951] ? fsnotify+0x415/0x1100 [ 31.463652] ? fsnotify_first_mark+0x330/0x330 [ 31.468215] sock_release+0x96/0x1b0 [ 31.471909] ? sock_alloc_file+0x4e0/0x4e0 [ 31.476122] sock_close+0x16/0x20 [ 31.479551] __fput+0x34d/0x890 [ 31.482811] ? fput+0x1a0/0x1a0 [ 31.486071] ? check_same_owner+0x320/0x320 [ 31.490386] ____fput+0x15/0x20 [ 31.493650] task_work_run+0x1e4/0x290 [ 31.497516] ? task_work_cancel+0x240/0x240 [ 31.501818] ? switch_task_namespaces+0xbd/0xd0 [ 31.506468] do_exit+0x1aee/0x2730 [ 31.509989] ? find_held_lock+0x36/0x1c0 [ 31.514040] ? mm_update_next_owner+0x980/0x980 [ 31.518693] ? kasan_check_read+0x11/0x20 [ 31.522820] ? rcu_is_watching+0x85/0x140 [ 31.526944] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 31.532118] ? tun_get+0x22b/0x360 [ 31.535636] ? tun_chr_close+0x60/0x60 [ 31.539506] ? tun_chr_write_iter+0x110/0x154 [ 31.543987] ? fsnotify+0x415/0x1100 [ 31.547684] ? kasan_check_read+0x11/0x20 [ 31.551815] ? rcu_is_watching+0x85/0x140 [ 31.555940] ? rcu_pm_notify+0xc0/0xc0 [ 31.559814] ? vfs_writev+0x255/0x330 [ 31.563597] ? rcu_read_lock_sched_held+0x108/0x120 [ 31.568591] ? kfree+0x1e9/0x260 [ 31.571939] ? vfs_writev+0xfc/0x330 [ 31.575639] ? vfs_iter_write+0xb0/0xb0 [ 31.579597] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 31.585118] ? sockfd_lookup_light+0xc5/0x160 [ 31.589593] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.595109] ? __fdget_pos+0xd6/0x1e0 [ 31.598895] ? __fdget_raw+0x20/0x20 [ 31.602593] do_group_exit+0x16f/0x430 [ 31.606460] ? SyS_exit+0x30/0x30 [ 31.609894] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 31.614728] ? do_syscall_64+0xb7/0x9d0 [ 31.618682] ? do_group_exit+0x430/0x430 [ 31.622723] SyS_exit_group+0x1d/0x20 [ 31.626589] do_syscall_64+0x29e/0x9d0 [ 31.630455] ? vmalloc_sync_all+0x30/0x30 [ 31.634582] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 31.639318] ? syscall_return_slowpath+0x5c0/0x5c0 [ 31.644232] ? syscall_return_slowpath+0x30f/0x5c0 [ 31.649146] ? entry_SYSCALL_64_after_hwframe+0x52/0xb7 [ 31.654491] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 31.659316] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 31.664492] RIP: 0033:0x441779 [ 31.667658] RSP: 002b:00007ffde22bc6e8 EFLAGS: 00000206 ORIG_RAX: 00000000000000e7 [ 31.675351] RAX: ffffffffffffffda RBX: 000000000000001b RCX: 0000000000441779 [ 31.682598] RDX: 00000000004416b0 RSI: 0000000000000001 RDI: 0000000000000001 [ 31.689845] RBP: 00000000004a3389 R08: 0000000000000019 R09: 00000000006cd018 [ 31.697101] R10: 0000000000000001 R11: 0000000000000206 R12: 00007ffde22bc7d8 [ 31.704349] R13: 0000000000402500 R14: 0000000000000000 R15: 0000000000000000 [ 31.711610] [ 31.713214] Allocated by task 4502: [ 31.716821] save_stack+0x43/0xd0 [ 31.720250] kasan_kmalloc+0xc4/0xe0 [ 31.723939] __kmalloc_node_track_caller+0x47/0x70 [ 31.728848] __kmalloc_reserve.isra.38+0x3a/0xe0 [ 31.733581] __alloc_skb+0x14d/0x780 [ 31.737274] alloc_skb_with_frags+0x137/0x760 [ 31.741746] sock_alloc_send_pskb+0x87a/0xae0 [ 31.746221] packet_sendmsg+0x1bd1/0x6100 [ 31.750351] sock_sendmsg+0xd5/0x120 [ 31.754045] ___sys_sendmsg+0x805/0x940 [ 31.758002] __sys_sendmsg+0x115/0x270 [ 31.761873] SyS_sendmsg+0x29/0x30 [ 31.765391] do_syscall_64+0x29e/0x9d0 [ 31.769257] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 31.774418] [ 31.776025] Freed by task 4502: [ 31.779283] save_stack+0x43/0xd0 [ 31.782711] __kasan_slab_free+0x11a/0x170 [ 31.786921] kasan_slab_free+0xe/0x10 [ 31.790698] kfree+0xd9/0x260 [ 31.793780] skb_free_head+0x99/0xc0 [ 31.797468] skb_release_data+0x690/0x860 [ 31.801601] skb_release_all+0x4a/0x60 [ 31.805465] kfree_skb+0x195/0x560 [ 31.808989] ip6_tnl_start_xmit+0xa44/0x2290 [ 31.813376] dev_hard_start_xmit+0x264/0xc10 [ 31.817761] __dev_queue_xmit+0x2724/0x34c0 [ 31.822061] dev_queue_xmit+0x17/0x20 [ 31.825838] packet_sendmsg+0x411d/0x6100 [ 31.829964] sock_sendmsg+0xd5/0x120 [ 31.833653] ___sys_sendmsg+0x805/0x940 [ 31.837603] __sys_sendmsg+0x115/0x270 [ 31.841463] SyS_sendmsg+0x29/0x30 [ 31.844986] do_syscall_64+0x29e/0x9d0 [ 31.848859] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 31.854022] [ 31.855632] The buggy address belongs to the object at ffff8801d4632800 [ 31.855632] which belongs to the cache kmalloc-512 of size 512 [ 31.868268] The buggy address is located 224 bytes inside of [ 31.868268] 512-byte region [ffff8801d4632800, ffff8801d4632a00) [ 31.880115] The buggy address belongs to the page: [ 31.885030] page:ffffea0007518c80 count:1 mapcount:0 mapping:ffff8801d4632080 index:0x0 [ 31.893156] flags: 0x2fffc0000000100(slab) [ 31.897370] raw: 02fffc0000000100 ffff8801d4632080 0000000000000000 0000000100000006 [ 31.905229] raw: ffffea000753ea60 ffffea0007519f20 ffff8801dac00940 0000000000000000 [ 31.913087] page dumped because: kasan: bad access detected [ 31.918854] [ 31.920542] Memory state around the buggy address: [ 31.925447] ffff8801d4632780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 31.932782] ffff8801d4632800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 31.940124] >ffff8801d4632880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 31.947466] ^ [ 31.953939] ffff8801d4632900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 31.961275] ffff8801d4632980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 31.968696] ================================================================== [ 31.976034] Disabling lock debugging due to kernel taint [ 31.982145] Kernel panic - not syncing: panic_on_warn set ... [ 31.982145] [ 31.989521] CPU: 0 PID: 4502 Comm: syzkaller082227 Tainted: G B 4.16.0+ #17 [ 31.997830] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.007163] Call Trace: [ 32.009755] dump_stack+0x1b9/0x294 [ 32.013393] ? dump_stack_print_info.cold.2+0x52/0x52 [ 32.018582] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 32.023317] ? skb_release_data+0xd0/0x860 [ 32.027531] panic+0x22f/0x4de [ 32.030705] ? add_taint.cold.5+0x16/0x16 [ 32.034832] ? do_raw_spin_unlock+0x9e/0x2e0 [ 32.039216] ? do_raw_spin_unlock+0x9e/0x2e0 [ 32.043599] ? skb_release_data+0x19b/0x860 [ 32.047897] kasan_end_report+0x47/0x4f [ 32.051844] kasan_report.cold.7+0xc9/0x2f5 [ 32.056145] check_memory_region+0x13e/0x1b0 [ 32.060531] kasan_check_write+0x14/0x20 [ 32.064569] skb_release_data+0x19b/0x860 [ 32.068691] ? skb_tx_error+0x2f0/0x2f0 [ 32.072638] ? kasan_check_read+0x11/0x20 [ 32.076763] ? rcu_is_watching+0x85/0x140 [ 32.080886] ? kasan_check_write+0x14/0x20 [ 32.085099] ? sock_rmem_free+0x6f/0x90 [ 32.089052] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 32.094567] skb_release_all+0x4a/0x60 [ 32.098447] kfree_skb+0x195/0x560 [ 32.101961] ? skb_queue_purge+0x19/0x40 [ 32.106002] ? __kfree_skb+0x20/0x20 [ 32.109708] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 32.114273] ? _raw_spin_unlock_irqrestore+0x74/0xc0 [ 32.119349] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 32.124341] ? trace_hardirqs_on+0xd/0x10 [ 32.128475] ? skb_dequeue+0x12f/0x180 [ 32.132336] skb_queue_purge+0x19/0x40 [ 32.136202] packet_sock_destruct+0x93/0x290 [ 32.140587] ? packet_mm_close+0xc0/0xc0 [ 32.144621] ? graph_lock+0x170/0x170 [ 32.148399] ? __free_object+0x16e/0x330 [ 32.152439] ? __list_del_entry_valid.cold.1+0x58/0x58 [ 32.157697] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 32.162253] ? packet_mm_close+0xc0/0xc0 [ 32.166291] __sk_destruct+0xff/0xa40 [ 32.170071] ? sock_warn_obsolete_bsdism+0xb0/0xb0 [ 32.174976] ? graph_lock+0x170/0x170 [ 32.178753] ? lock_downgrade+0x8e0/0x8e0 [ 32.182879] ? __lock_is_held+0xb5/0x140 [ 32.186918] ? kasan_check_read+0x11/0x20 [ 32.191051] ? do_raw_spin_unlock+0x9e/0x2e0 [ 32.195438] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 32.199995] ? _raw_spin_unlock_irqrestore+0x74/0xc0 [ 32.205088] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.210605] ? refcount_sub_and_test+0x212/0x330 [ 32.216432] ? refcount_inc_not_zero+0x2d0/0x2d0 [ 32.221163] ? refcount_inc_not_zero+0x2d0/0x2d0 [ 32.225894] ? pcpu_free_area+0xa90/0xa90 [ 32.230024] sk_destruct+0x78/0x90 [ 32.233543] __sk_free+0x22e/0x340 [ 32.237065] sk_free+0x42/0x50 [ 32.240341] packet_release+0xa18/0xd50 [ 32.244300] ? lock_downgrade+0x8e0/0x8e0 [ 32.248543] ? packet_lookup_frame+0x270/0x270 [ 32.253109] ? cpumask_weight.constprop.5+0x44/0x44 [ 32.258102] ? do_raw_spin_lock+0xc1/0x200 [ 32.262438] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 32.267949] ? locks_remove_file+0x3f7/0x5a0 [ 32.272339] ? fcntl_setlk+0x1020/0x1020 [ 32.276377] ? fsnotify+0x415/0x1100 [ 32.280070] ? fsnotify_first_mark+0x330/0x330 [ 32.284627] sock_release+0x96/0x1b0 [ 32.288321] ? sock_alloc_file+0x4e0/0x4e0 [ 32.292533] sock_close+0x16/0x20 [ 32.295969] __fput+0x34d/0x890 [ 32.299229] ? fput+0x1a0/0x1a0 [ 32.302485] ? check_same_owner+0x320/0x320 [ 32.306789] ____fput+0x15/0x20 [ 32.310052] task_work_run+0x1e4/0x290 [ 32.313923] ? task_work_cancel+0x240/0x240 [ 32.318226] ? switch_task_namespaces+0xbd/0xd0 [ 32.322875] do_exit+0x1aee/0x2730 [ 32.326393] ? find_held_lock+0x36/0x1c0 [ 32.330433] ? mm_update_next_owner+0x980/0x980 [ 32.335094] ? kasan_check_read+0x11/0x20 [ 32.339220] ? rcu_is_watching+0x85/0x140 [ 32.343353] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 32.348526] ? tun_get+0x22b/0x360 [ 32.352044] ? tun_chr_close+0x60/0x60 [ 32.355911] ? tun_chr_write_iter+0x110/0x154 [ 32.360385] ? fsnotify+0x415/0x1100 [ 32.364080] ? kasan_check_read+0x11/0x20 [ 32.368217] ? rcu_is_watching+0x85/0x140 [ 32.372344] ? rcu_pm_notify+0xc0/0xc0 [ 32.376212] ? vfs_writev+0x255/0x330 [ 32.379993] ? rcu_read_lock_sched_held+0x108/0x120 [ 32.384995] ? kfree+0x1e9/0x260 [ 32.388341] ? vfs_writev+0xfc/0x330 [ 32.392042] ? vfs_iter_write+0xb0/0xb0 [ 32.396000] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 32.401528] ? sockfd_lookup_light+0xc5/0x160 [ 32.406001] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.411611] ? __fdget_pos+0xd6/0x1e0 [ 32.415390] ? __fdget_raw+0x20/0x20 [ 32.419086] do_group_exit+0x16f/0x430 [ 32.422953] ? SyS_exit+0x30/0x30 [ 32.426384] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 32.431211] ? do_syscall_64+0xb7/0x9d0 [ 32.435171] ? do_group_exit+0x430/0x430 [ 32.439208] SyS_exit_group+0x1d/0x20 [ 32.442994] do_syscall_64+0x29e/0x9d0 [ 32.446865] ? vmalloc_sync_all+0x30/0x30 [ 32.450989] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 32.455726] ? syscall_return_slowpath+0x5c0/0x5c0 [ 32.460641] ? syscall_return_slowpath+0x30f/0x5c0 [ 32.465555] ? entry_SYSCALL_64_after_hwframe+0x52/0xb7 [ 32.470895] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 32.475717] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 32.480880] RIP: 0033:0x441779 [ 32.484043] RSP: 002b:00007ffde22bc6e8 EFLAGS: 00000206 ORIG_RAX: 00000000000000e7 [ 32.491727] RAX: ffffffffffffffda RBX: 000000000000001b RCX: 0000000000441779 [ 32.498975] RDX: 00000000004416b0 RSI: 0000000000000001 RDI: 0000000000000001 [ 32.506226] RBP: 00000000004a3389 R08: 0000000000000019 R09: 00000000006cd018 [ 32.513473] R10: 0000000000000001 R11: 0000000000000206 R12: 00007ffde22bc7d8 [ 32.520721] R13: 0000000000402500 R14: 0000000000000000 R15: 0000000000000000 [ 32.528596] Dumping ftrace buffer: [ 32.532124] (ftrace buffer empty) [ 32.535832] Kernel Offset: disabled [ 32.539442] Rebooting in 86400 seconds..