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 '10.128.10.5' (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: [ 29.874055] IPVS: ftp: loaded support on port[0] = 21 RTNETLINK answers: Operation not supported RTNETLINK answers: No buffer space available RTNETLINK answers: Operation not supported [ 30.154554] 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 [ 30.576268] IPv6: ADDRCONF(NETDEV_UP): bond0: link is not ready [ 30.582416] 8021q: adding VLAN 0 to HW filter on device bond0 [ 30.625093] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 30.669809] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 30.715310] IPv6: ADDRCONF(NETDEV_UP): team0: link is not ready [ 30.721472] 8021q: adding VLAN 0 to HW filter on device team0 [ 30.750927] bond0: Enslaving bond_slave as an active interface with an up link executing program [ 30.760727] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 30.774713] team0: Port device team_slave added [ 30.780421] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 30.824298] ================================================================== [ 30.831842] BUG: KASAN: use-after-free in skb_release_data+0x19b/0x860 [ 30.838509] Write of size 4 at addr ffff8801d466b8e0 by task syzkaller382510/4495 [ 30.846117] [ 30.847751] CPU: 1 PID: 4495 Comm: syzkaller382510 Not tainted 4.16.0+ #17 [ 30.854761] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.864184] Call Trace: [ 30.866765] dump_stack+0x1b9/0x294 [ 30.870376] ? dump_stack_print_info.cold.2+0x52/0x52 [ 30.875545] ? printk+0x9e/0xba [ 30.878805] ? kmsg_dump_rewind_nolock+0xe4/0xe4 [ 30.883540] ? kasan_check_write+0x14/0x20 [ 30.887754] print_address_description+0x6c/0x20b [ 30.892576] ? skb_release_data+0x19b/0x860 [ 30.896875] kasan_report.cold.7+0xac/0x2f5 [ 30.901179] check_memory_region+0x13e/0x1b0 [ 30.905566] kasan_check_write+0x14/0x20 [ 30.909603] skb_release_data+0x19b/0x860 [ 30.913730] ? skb_tx_error+0x2f0/0x2f0 [ 30.917680] ? kasan_check_read+0x11/0x20 [ 30.921807] ? rcu_is_watching+0x85/0x140 [ 30.925933] ? kasan_check_write+0x14/0x20 [ 30.930149] ? sock_rmem_free+0x6f/0x90 [ 30.934145] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 30.939694] skb_release_all+0x4a/0x60 [ 30.943565] kfree_skb+0x195/0x560 [ 30.947082] ? skb_queue_purge+0x19/0x40 [ 30.951131] ? __kfree_skb+0x20/0x20 [ 30.954824] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 30.959397] ? _raw_spin_unlock_irqrestore+0x74/0xc0 [ 30.964482] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 30.969476] ? trace_hardirqs_on+0xd/0x10 [ 30.973605] ? skb_dequeue+0x12f/0x180 [ 30.977472] skb_queue_purge+0x19/0x40 [ 30.981338] packet_sock_destruct+0x93/0x290 [ 30.985723] ? packet_mm_close+0xc0/0xc0 [ 30.989760] ? graph_lock+0x170/0x170 [ 30.993550] ? __free_object+0x16e/0x330 [ 30.997588] ? __list_del_entry_valid.cold.1+0x58/0x58 [ 31.002843] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 31.007404] ? packet_mm_close+0xc0/0xc0 [ 31.011443] __sk_destruct+0xff/0xa40 [ 31.015223] ? sock_warn_obsolete_bsdism+0xb0/0xb0 [ 31.020131] ? graph_lock+0x170/0x170 [ 31.023918] ? lock_downgrade+0x8e0/0x8e0 [ 31.028054] ? __lock_is_held+0xb5/0x140 [ 31.032099] ? kasan_check_read+0x11/0x20 [ 31.036226] ? do_raw_spin_unlock+0x9e/0x2e0 [ 31.040624] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 31.045187] ? _raw_spin_unlock_irqrestore+0x74/0xc0 [ 31.050272] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.055787] ? refcount_sub_and_test+0x212/0x330 [ 31.060523] ? refcount_inc_not_zero+0x2d0/0x2d0 [ 31.065260] ? refcount_inc_not_zero+0x2d0/0x2d0 [ 31.069995] ? pcpu_free_area+0xa90/0xa90 [ 31.074131] sk_destruct+0x78/0x90 [ 31.077649] __sk_free+0x22e/0x340 [ 31.081170] sk_free+0x42/0x50 [ 31.084340] packet_release+0xa18/0xd50 [ 31.088292] ? lock_downgrade+0x8e0/0x8e0 [ 31.092420] ? packet_lookup_frame+0x270/0x270 [ 31.096980] ? cpumask_weight.constprop.5+0x44/0x44 [ 31.101975] ? do_raw_spin_lock+0xc1/0x200 [ 31.106189] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 31.111707] ? locks_remove_file+0x3f7/0x5a0 [ 31.116101] ? fcntl_setlk+0x1020/0x1020 [ 31.120140] ? fsnotify+0x415/0x1100 [ 31.123835] ? fsnotify_first_mark+0x330/0x330 [ 31.128408] sock_release+0x96/0x1b0 [ 31.132100] ? sock_alloc_file+0x4e0/0x4e0 [ 31.136315] sock_close+0x16/0x20 [ 31.139748] __fput+0x34d/0x890 [ 31.143014] ? fput+0x1a0/0x1a0 [ 31.146285] ? check_same_owner+0x320/0x320 [ 31.150587] ____fput+0x15/0x20 [ 31.153848] task_work_run+0x1e4/0x290 [ 31.157721] ? task_work_cancel+0x240/0x240 [ 31.162032] ? switch_task_namespaces+0xbd/0xd0 [ 31.166685] do_exit+0x1aee/0x2730 [ 31.170200] ? find_held_lock+0x36/0x1c0 [ 31.174241] ? mm_update_next_owner+0x980/0x980 [ 31.178893] ? kasan_check_read+0x11/0x20 [ 31.183030] ? rcu_is_watching+0x85/0x140 [ 31.187184] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 31.192362] ? tun_get+0x22b/0x360 [ 31.195890] ? tun_chr_close+0x60/0x60 [ 31.199759] ? tun_chr_write_iter+0x110/0x154 [ 31.204238] ? fsnotify+0x415/0x1100 [ 31.207935] ? kasan_check_read+0x11/0x20 [ 31.212061] ? rcu_is_watching+0x85/0x140 [ 31.216188] ? rcu_pm_notify+0xc0/0xc0 [ 31.220146] ? vfs_writev+0x255/0x330 [ 31.223926] ? rcu_read_lock_sched_held+0x108/0x120 [ 31.228921] ? kfree+0x1e9/0x260 [ 31.232266] ? vfs_writev+0xfc/0x330 [ 31.235960] ? vfs_iter_write+0xb0/0xb0 [ 31.239922] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 31.245440] ? sockfd_lookup_light+0xc5/0x160 [ 31.249917] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.255430] ? __fdget_pos+0xd6/0x1e0 [ 31.259209] ? __fdget_raw+0x20/0x20 [ 31.262909] do_group_exit+0x16f/0x430 [ 31.266778] ? SyS_exit+0x30/0x30 [ 31.270216] ? do_syscall_64+0xb7/0x9d0 [ 31.274169] ? do_group_exit+0x430/0x430 [ 31.278208] SyS_exit_group+0x1d/0x20 [ 31.281985] do_syscall_64+0x29e/0x9d0 [ 31.285855] ? vmalloc_sync_all+0x30/0x30 [ 31.289997] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 31.294738] ? syscall_return_slowpath+0x5c0/0x5c0 [ 31.299645] ? syscall_return_slowpath+0x30f/0x5c0 [ 31.304555] ? entry_SYSCALL_64_after_hwframe+0x52/0xb7 [ 31.309897] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 31.314723] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 31.319891] RIP: 0033:0x4419a9 [ 31.323061] RSP: 002b:00007ffe136ec9b8 EFLAGS: 00000206 ORIG_RAX: 00000000000000e7 [ 31.330751] RAX: ffffffffffffffda RBX: 000000000000001b RCX: 00000000004419a9 [ 31.338022] RDX: 00000000004418e0 RSI: 0000000000000001 RDI: 0000000000000001 [ 31.345278] RBP: 00000000004a35c9 R08: 0000000000000020 R09: 00000000006cd018 [ 31.352526] R10: 0000000000000000 R11: 0000000000000206 R12: 00007ffe136ecab8 [ 31.359772] R13: 0000000000402730 R14: 0000000000000000 R15: 0000000000000000 [ 31.367034] [ 31.368643] Allocated by task 4495: [ 31.372255] save_stack+0x43/0xd0 [ 31.375686] kasan_kmalloc+0xc4/0xe0 [ 31.379375] __kmalloc_node_track_caller+0x47/0x70 [ 31.384283] __kmalloc_reserve.isra.38+0x3a/0xe0 [ 31.389034] __alloc_skb+0x14d/0x780 [ 31.392729] alloc_skb_with_frags+0x137/0x760 [ 31.397203] sock_alloc_send_pskb+0x87a/0xae0 [ 31.401679] packet_sendmsg+0x1bd1/0x6100 [ 31.405807] sock_sendmsg+0xd5/0x120 [ 31.409496] ___sys_sendmsg+0x805/0x940 [ 31.413469] __sys_sendmsg+0x115/0x270 [ 31.417356] SyS_sendmsg+0x29/0x30 [ 31.420880] do_syscall_64+0x29e/0x9d0 [ 31.424759] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 31.429923] [ 31.431530] Freed by task 4495: [ 31.434807] save_stack+0x43/0xd0 [ 31.438240] __kasan_slab_free+0x11a/0x170 [ 31.442480] kasan_slab_free+0xe/0x10 [ 31.446279] kfree+0xd9/0x260 [ 31.449392] skb_free_head+0x99/0xc0 [ 31.453103] skb_release_data+0x690/0x860 [ 31.457243] skb_release_all+0x4a/0x60 [ 31.461111] kfree_skb+0x195/0x560 [ 31.464633] ip6_tnl_start_xmit+0xa44/0x2290 [ 31.469025] dev_hard_start_xmit+0x264/0xc10 [ 31.473417] __dev_queue_xmit+0x2724/0x34c0 [ 31.477717] dev_queue_xmit+0x17/0x20 [ 31.481499] packet_sendmsg+0x411d/0x6100 [ 31.485630] sock_sendmsg+0xd5/0x120 [ 31.489321] ___sys_sendmsg+0x805/0x940 [ 31.493270] __sys_sendmsg+0x115/0x270 [ 31.497131] SyS_sendmsg+0x29/0x30 [ 31.500654] do_syscall_64+0x29e/0x9d0 [ 31.504523] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 31.509689] [ 31.511296] The buggy address belongs to the object at ffff8801d466b800 [ 31.511296] which belongs to the cache kmalloc-512 of size 512 [ 31.523943] The buggy address is located 224 bytes inside of [ 31.523943] 512-byte region [ffff8801d466b800, ffff8801d466ba00) [ 31.535798] The buggy address belongs to the page: [ 31.540712] page:ffffea0007519ac0 count:1 mapcount:0 mapping:ffff8801d466b080 index:0x0 [ 31.548841] flags: 0x2fffc0000000100(slab) [ 31.553058] raw: 02fffc0000000100 ffff8801d466b080 0000000000000000 0000000100000006 [ 31.560921] raw: ffffea00075199e0 ffffea0007519b20 ffff8801dac00940 0000000000000000 [ 31.569304] page dumped because: kasan: bad access detected [ 31.575000] [ 31.576610] Memory state around the buggy address: [ 31.581516] ffff8801d466b780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 31.588862] ffff8801d466b800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 31.596209] >ffff8801d466b880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 31.603544] ^ [ 31.610020] ffff8801d466b900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 31.617360] ffff8801d466b980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 31.624694] ================================================================== [ 31.632037] Disabling lock debugging due to kernel taint [ 31.638037] Kernel panic - not syncing: panic_on_warn set ... [ 31.638037] [ 31.645429] CPU: 1 PID: 4495 Comm: syzkaller382510 Tainted: G B 4.16.0+ #17 [ 31.653736] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.663067] Call Trace: [ 31.665641] dump_stack+0x1b9/0x294 [ 31.669247] ? dump_stack_print_info.cold.2+0x52/0x52 [ 31.674417] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 31.679153] ? skb_release_data+0xd0/0x860 [ 31.683365] panic+0x22f/0x4de [ 31.686534] ? add_taint.cold.5+0x16/0x16 [ 31.690659] ? do_raw_spin_unlock+0x9e/0x2e0 [ 31.695049] ? do_raw_spin_unlock+0x9e/0x2e0 [ 31.699435] ? skb_release_data+0x19b/0x860 [ 31.703739] kasan_end_report+0x47/0x4f [ 31.707701] kasan_report.cold.7+0xc9/0x2f5 [ 31.712002] check_memory_region+0x13e/0x1b0 [ 31.716412] kasan_check_write+0x14/0x20 [ 31.720450] skb_release_data+0x19b/0x860 [ 31.724609] ? skb_tx_error+0x2f0/0x2f0 [ 31.728578] ? kasan_check_read+0x11/0x20 [ 31.732704] ? rcu_is_watching+0x85/0x140 [ 31.736827] ? kasan_check_write+0x14/0x20 [ 31.741049] ? sock_rmem_free+0x6f/0x90 [ 31.745004] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 31.750529] skb_release_all+0x4a/0x60 [ 31.754395] kfree_skb+0x195/0x560 [ 31.757910] ? skb_queue_purge+0x19/0x40 [ 31.761949] ? __kfree_skb+0x20/0x20 [ 31.765641] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 31.770201] ? _raw_spin_unlock_irqrestore+0x74/0xc0 [ 31.775284] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 31.780277] ? trace_hardirqs_on+0xd/0x10 [ 31.784405] ? skb_dequeue+0x12f/0x180 [ 31.788279] skb_queue_purge+0x19/0x40 [ 31.792156] packet_sock_destruct+0x93/0x290 [ 31.796571] ? packet_mm_close+0xc0/0xc0 [ 31.800648] ? graph_lock+0x170/0x170 [ 31.804443] ? __free_object+0x16e/0x330 [ 31.808481] ? __list_del_entry_valid.cold.1+0x58/0x58 [ 31.813739] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 31.818297] ? packet_mm_close+0xc0/0xc0 [ 31.822337] __sk_destruct+0xff/0xa40 [ 31.826117] ? sock_warn_obsolete_bsdism+0xb0/0xb0 [ 31.831031] ? graph_lock+0x170/0x170 [ 31.834818] ? lock_downgrade+0x8e0/0x8e0 [ 31.838961] ? __lock_is_held+0xb5/0x140 [ 31.843012] ? kasan_check_read+0x11/0x20 [ 31.847145] ? do_raw_spin_unlock+0x9e/0x2e0 [ 31.851528] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 31.856091] ? _raw_spin_unlock_irqrestore+0x74/0xc0 [ 31.861174] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.866689] ? refcount_sub_and_test+0x212/0x330 [ 31.871422] ? refcount_inc_not_zero+0x2d0/0x2d0 [ 31.876154] ? refcount_inc_not_zero+0x2d0/0x2d0 [ 31.880887] ? pcpu_free_area+0xa90/0xa90 [ 31.885017] sk_destruct+0x78/0x90 [ 31.888540] __sk_free+0x22e/0x340 [ 31.892055] sk_free+0x42/0x50 [ 31.895226] packet_release+0xa18/0xd50 [ 31.899176] ? lock_downgrade+0x8e0/0x8e0 [ 31.903300] ? packet_lookup_frame+0x270/0x270 [ 31.907859] ? cpumask_weight.constprop.5+0x44/0x44 [ 31.912852] ? do_raw_spin_lock+0xc1/0x200 [ 31.917065] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 31.922589] ? locks_remove_file+0x3f7/0x5a0 [ 31.926975] ? fcntl_setlk+0x1020/0x1020 [ 31.931019] ? fsnotify+0x415/0x1100 [ 31.934716] ? fsnotify_first_mark+0x330/0x330 [ 31.939286] sock_release+0x96/0x1b0 [ 31.942986] ? sock_alloc_file+0x4e0/0x4e0 [ 31.947201] sock_close+0x16/0x20 [ 31.950631] __fput+0x34d/0x890 [ 31.953885] ? fput+0x1a0/0x1a0 [ 31.957142] ? check_same_owner+0x320/0x320 [ 31.961439] ____fput+0x15/0x20 [ 31.964694] task_work_run+0x1e4/0x290 [ 31.968644] ? task_work_cancel+0x240/0x240 [ 31.972942] ? switch_task_namespaces+0xbd/0xd0 [ 31.977593] do_exit+0x1aee/0x2730 [ 31.981109] ? find_held_lock+0x36/0x1c0 [ 31.985146] ? mm_update_next_owner+0x980/0x980 [ 31.989798] ? kasan_check_read+0x11/0x20 [ 31.993923] ? rcu_is_watching+0x85/0x140 [ 31.998050] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 32.003232] ? tun_get+0x22b/0x360 [ 32.006749] ? tun_chr_close+0x60/0x60 [ 32.010615] ? tun_chr_write_iter+0x110/0x154 [ 32.015090] ? fsnotify+0x415/0x1100 [ 32.018792] ? kasan_check_read+0x11/0x20 [ 32.022917] ? rcu_is_watching+0x85/0x140 [ 32.027040] ? rcu_pm_notify+0xc0/0xc0 [ 32.030906] ? vfs_writev+0x255/0x330 [ 32.034682] ? rcu_read_lock_sched_held+0x108/0x120 [ 32.039673] ? kfree+0x1e9/0x260 [ 32.043021] ? vfs_writev+0xfc/0x330 [ 32.046713] ? vfs_iter_write+0xb0/0xb0 [ 32.050666] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 32.056180] ? sockfd_lookup_light+0xc5/0x160 [ 32.060654] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.066169] ? __fdget_pos+0xd6/0x1e0 [ 32.069963] ? __fdget_raw+0x20/0x20 [ 32.073661] do_group_exit+0x16f/0x430 [ 32.077527] ? SyS_exit+0x30/0x30 [ 32.080958] ? do_syscall_64+0xb7/0x9d0 [ 32.084909] ? do_group_exit+0x430/0x430 [ 32.088948] SyS_exit_group+0x1d/0x20 [ 32.092725] do_syscall_64+0x29e/0x9d0 [ 32.096589] ? vmalloc_sync_all+0x30/0x30 [ 32.100714] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 32.105447] ? syscall_return_slowpath+0x5c0/0x5c0 [ 32.110352] ? syscall_return_slowpath+0x30f/0x5c0 [ 32.115272] ? entry_SYSCALL_64_after_hwframe+0x52/0xb7 [ 32.120614] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 32.125434] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 32.130598] RIP: 0033:0x4419a9 [ 32.133764] RSP: 002b:00007ffe136ec9b8 EFLAGS: 00000206 ORIG_RAX: 00000000000000e7 [ 32.141452] RAX: ffffffffffffffda RBX: 000000000000001b RCX: 00000000004419a9 [ 32.148696] RDX: 00000000004418e0 RSI: 0000000000000001 RDI: 0000000000000001 [ 32.155942] RBP: 00000000004a35c9 R08: 0000000000000020 R09: 00000000006cd018 [ 32.163187] R10: 0000000000000000 R11: 0000000000000206 R12: 00007ffe136ecab8 [ 32.170430] R13: 0000000000402730 R14: 0000000000000000 R15: 0000000000000000 [ 32.178115] Dumping ftrace buffer: [ 32.181629] (ftrace buffer empty) [ 32.185313] Kernel Offset: disabled [ 32.188913] Rebooting in 86400 seconds..