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 '10.128.0.10' (ECDSA) to the list of known hosts. net.ipv6.conf.syz_tun.accept_dad = 0 syzkaller login: [ 40.570536] 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 [ 40.831663] 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 [ 41.203402] IPv6: ADDRCONF(NETDEV_UP): bond0: link is not ready [ 41.209548] 8021q: adding VLAN 0 to HW filter on device bond0 [ 41.248724] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 41.288374] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 41.328598] IPv6: ADDRCONF(NETDEV_UP): team0: link is not ready [ 41.334715] 8021q: adding VLAN 0 to HW filter on device team0 [ 41.361307] bond0: Enslaving bond_slave as an active interface with an up link [ 41.369987] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready executing program [ 41.386507] team0: Port device team_slave added [ 41.391780] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 41.430229] ================================================================== [ 41.437729] BUG: KASAN: use-after-free in skb_release_data+0x19b/0x860 [ 41.444375] Write of size 4 at addr ffff8801d87e43a0 by task syzkaller481670/4468 [ 41.451967] [ 41.453577] CPU: 1 PID: 4468 Comm: syzkaller481670 Not tainted 4.16.0+ #17 [ 41.460570] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 41.469903] Call Trace: [ 41.472479] dump_stack+0x1b9/0x294 [ 41.476087] ? dump_stack_print_info.cold.2+0x52/0x52 [ 41.481258] ? printk+0x9e/0xba [ 41.484519] ? kmsg_dump_rewind_nolock+0xe4/0xe4 [ 41.489255] ? kasan_check_write+0x14/0x20 [ 41.493472] print_address_description+0x6c/0x20b [ 41.498293] ? skb_release_data+0x19b/0x860 [ 41.502604] kasan_report.cold.7+0xac/0x2f5 [ 41.506905] check_memory_region+0x13e/0x1b0 [ 41.511294] kasan_check_write+0x14/0x20 [ 41.515337] skb_release_data+0x19b/0x860 [ 41.519467] ? skb_tx_error+0x2f0/0x2f0 [ 41.523419] ? kasan_check_read+0x11/0x20 [ 41.527550] ? rcu_is_watching+0x85/0x140 [ 41.531688] ? kasan_check_write+0x14/0x20 [ 41.535909] ? sock_rmem_free+0x6f/0x90 [ 41.539864] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 41.545385] skb_release_all+0x4a/0x60 [ 41.549249] kfree_skb+0x195/0x560 [ 41.552764] ? skb_queue_purge+0x19/0x40 [ 41.556803] ? __kfree_skb+0x20/0x20 [ 41.560499] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 41.565060] ? _raw_spin_unlock_irqrestore+0x74/0xc0 [ 41.570143] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 41.575138] ? trace_hardirqs_on+0xd/0x10 [ 41.579266] ? skb_dequeue+0x12f/0x180 [ 41.583130] skb_queue_purge+0x19/0x40 [ 41.586999] packet_sock_destruct+0x93/0x290 [ 41.591383] ? packet_mm_close+0xc0/0xc0 [ 41.595421] ? graph_lock+0x170/0x170 [ 41.599200] ? __free_object+0x16e/0x330 [ 41.603241] ? __list_del_entry_valid.cold.1+0x58/0x58 [ 41.608496] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 41.613055] ? packet_mm_close+0xc0/0xc0 [ 41.617095] __sk_destruct+0xff/0xa40 [ 41.620878] ? sock_warn_obsolete_bsdism+0xb0/0xb0 [ 41.625789] ? graph_lock+0x170/0x170 [ 41.629570] ? lock_downgrade+0x8e0/0x8e0 [ 41.633695] ? __lock_is_held+0xb5/0x140 [ 41.637737] ? kasan_check_read+0x11/0x20 [ 41.641862] ? do_raw_spin_unlock+0x9e/0x2e0 [ 41.646246] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 41.650808] ? _raw_spin_unlock_irqrestore+0x74/0xc0 [ 41.655893] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 41.661409] ? refcount_sub_and_test+0x212/0x330 [ 41.666146] ? refcount_inc_not_zero+0x2d0/0x2d0 [ 41.670880] ? refcount_inc_not_zero+0x2d0/0x2d0 [ 41.675614] ? pcpu_free_area+0xa90/0xa90 [ 41.679748] sk_destruct+0x78/0x90 [ 41.683268] __sk_free+0x22e/0x340 [ 41.686786] sk_free+0x42/0x50 [ 41.689961] packet_release+0xa18/0xd50 [ 41.693910] ? lock_downgrade+0x8e0/0x8e0 [ 41.698037] ? packet_lookup_frame+0x270/0x270 [ 41.702597] ? cpumask_weight.constprop.5+0x44/0x44 [ 41.707593] ? do_raw_spin_lock+0xc1/0x200 [ 41.711807] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 41.717323] ? locks_remove_file+0x3f7/0x5a0 [ 41.721716] ? fcntl_setlk+0x1020/0x1020 [ 41.725752] ? fsnotify+0x415/0x1100 [ 41.729446] ? fsnotify_first_mark+0x330/0x330 [ 41.734008] sock_release+0x96/0x1b0 [ 41.737702] ? sock_alloc_file+0x4e0/0x4e0 [ 41.741913] sock_close+0x16/0x20 [ 41.745341] __fput+0x34d/0x890 [ 41.748601] ? fput+0x1a0/0x1a0 [ 41.751863] ? check_same_owner+0x320/0x320 [ 41.756164] ____fput+0x15/0x20 [ 41.759420] task_work_run+0x1e4/0x290 [ 41.763284] ? task_work_cancel+0x240/0x240 [ 41.767585] ? switch_task_namespaces+0xbd/0xd0 [ 41.772237] do_exit+0x1aee/0x2730 [ 41.775753] ? find_held_lock+0x36/0x1c0 [ 41.779794] ? mm_update_next_owner+0x980/0x980 [ 41.784445] ? kasan_check_read+0x11/0x20 [ 41.788571] ? rcu_is_watching+0x85/0x140 [ 41.792708] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 41.797879] ? tun_get+0x22b/0x360 [ 41.801394] ? tun_chr_close+0x60/0x60 [ 41.805262] ? tun_chr_write_iter+0x110/0x154 [ 41.809735] ? fsnotify+0x415/0x1100 [ 41.813429] ? kasan_check_read+0x11/0x20 [ 41.817564] ? rcu_is_watching+0x85/0x140 [ 41.821688] ? rcu_pm_notify+0xc0/0xc0 [ 41.825559] ? vfs_writev+0x255/0x330 [ 41.829337] ? rcu_read_lock_sched_held+0x108/0x120 [ 41.834332] ? kfree+0x1e9/0x260 [ 41.837677] ? vfs_writev+0xfc/0x330 [ 41.841369] ? vfs_iter_write+0xb0/0xb0 [ 41.845324] ? lock_downgrade+0x8e0/0x8e0 [ 41.849457] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 41.854975] ? sockfd_lookup_light+0xc5/0x160 [ 41.859451] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 41.864965] ? __fdget_pos+0xd6/0x1e0 [ 41.868743] ? __fdget_raw+0x20/0x20 [ 41.872445] do_group_exit+0x16f/0x430 [ 41.876312] ? SyS_exit+0x30/0x30 [ 41.879746] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 41.884577] ? do_syscall_64+0xb7/0x9d0 [ 41.888529] ? do_group_exit+0x430/0x430 [ 41.892568] SyS_exit_group+0x1d/0x20 [ 41.896346] do_syscall_64+0x29e/0x9d0 [ 41.900210] ? vmalloc_sync_all+0x30/0x30 [ 41.904337] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 41.909071] ? syscall_return_slowpath+0x5c0/0x5c0 [ 41.913978] ? syscall_return_slowpath+0x30f/0x5c0 [ 41.918888] ? entry_SYSCALL_64_after_hwframe+0x52/0xb7 [ 41.924231] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 41.929067] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 41.934253] RIP: 0033:0x4419a9 [ 41.937426] RSP: 002b:00007ffcbe3cbda8 EFLAGS: 00000202 ORIG_RAX: 00000000000000e7 [ 41.945117] RAX: ffffffffffffffda RBX: 000000000000001b RCX: 00000000004419a9 [ 41.952450] RDX: 00000000004418e0 RSI: 0000000000000001 RDI: 0000000000000001 [ 41.959699] RBP: 00000000004a35c9 R08: 0000000000000020 R09: 00000000006cd018 [ 41.966945] R10: 0000000000000000 R11: 0000000000000202 R12: 00007ffcbe3cbea8 [ 41.974193] R13: 0000000000402730 R14: 0000000000000000 R15: 0000000000000000 [ 41.981446] [ 41.983052] Allocated by task 4468: [ 41.986667] save_stack+0x43/0xd0 [ 41.990098] kasan_kmalloc+0xc4/0xe0 [ 41.993787] __kmalloc_node_track_caller+0x47/0x70 [ 41.998695] __kmalloc_reserve.isra.38+0x3a/0xe0 [ 42.003425] __alloc_skb+0x14d/0x780 [ 42.007114] alloc_skb_with_frags+0x137/0x760 [ 42.011584] sock_alloc_send_pskb+0x87a/0xae0 [ 42.016059] packet_sendmsg+0x1bd1/0x6100 [ 42.020183] sock_sendmsg+0xd5/0x120 [ 42.023882] ___sys_sendmsg+0x805/0x940 [ 42.027831] __sys_sendmsg+0x115/0x270 [ 42.031692] SyS_sendmsg+0x29/0x30 [ 42.035214] do_syscall_64+0x29e/0x9d0 [ 42.039081] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 42.044243] [ 42.045845] Freed by task 4468: [ 42.049102] save_stack+0x43/0xd0 [ 42.052533] __kasan_slab_free+0x11a/0x170 [ 42.056743] kasan_slab_free+0xe/0x10 [ 42.060518] kfree+0xd9/0x260 [ 42.063604] skb_free_head+0x99/0xc0 [ 42.067291] skb_release_data+0x690/0x860 [ 42.071426] skb_release_all+0x4a/0x60 [ 42.075304] kfree_skb+0x195/0x560 [ 42.078824] ip6_tnl_start_xmit+0xa44/0x2290 [ 42.083233] dev_hard_start_xmit+0x264/0xc10 [ 42.087619] __dev_queue_xmit+0x2724/0x34c0 [ 42.091917] dev_queue_xmit+0x17/0x20 [ 42.095691] packet_sendmsg+0x411d/0x6100 [ 42.099817] sock_sendmsg+0xd5/0x120 [ 42.103507] ___sys_sendmsg+0x805/0x940 [ 42.107455] __sys_sendmsg+0x115/0x270 [ 42.111329] SyS_sendmsg+0x29/0x30 [ 42.114848] do_syscall_64+0x29e/0x9d0 [ 42.118713] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 42.123872] [ 42.125477] The buggy address belongs to the object at ffff8801d87e42c0 [ 42.125477] which belongs to the cache kmalloc-512 of size 512 [ 42.138116] The buggy address is located 224 bytes inside of [ 42.138116] 512-byte region [ffff8801d87e42c0, ffff8801d87e44c0) [ 42.149964] The buggy address belongs to the page: [ 42.154877] page:ffffea000761f900 count:1 mapcount:0 mapping:ffff8801d87e4040 index:0x0 [ 42.162998] flags: 0x2fffc0000000100(slab) [ 42.167219] raw: 02fffc0000000100 ffff8801d87e4040 0000000000000000 0000000100000006 [ 42.175080] raw: ffffea0007619120 ffffea0006b2d120 ffff8801dac00940 0000000000000000 [ 42.182932] page dumped because: kasan: bad access detected [ 42.188614] [ 42.190215] Memory state around the buggy address: [ 42.195121] ffff8801d87e4280: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb [ 42.202455] ffff8801d87e4300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 42.209791] >ffff8801d87e4380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 42.217123] ^ [ 42.221510] ffff8801d87e4400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 42.228843] ffff8801d87e4480: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 42.236181] ================================================================== [ 42.243514] Disabling lock debugging due to kernel taint [ 42.249323] Kernel panic - not syncing: panic_on_warn set ... [ 42.249323] [ 42.256674] CPU: 1 PID: 4468 Comm: syzkaller481670 Tainted: G B 4.16.0+ #17 [ 42.264982] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 42.274313] Call Trace: [ 42.276887] dump_stack+0x1b9/0x294 [ 42.280492] ? dump_stack_print_info.cold.2+0x52/0x52 [ 42.285662] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 42.290396] ? skb_release_data+0xd0/0x860 [ 42.294610] panic+0x22f/0x4de [ 42.297779] ? add_taint.cold.5+0x16/0x16 [ 42.301904] ? do_raw_spin_unlock+0x9e/0x2e0 [ 42.306292] ? do_raw_spin_unlock+0x9e/0x2e0 [ 42.310677] ? skb_release_data+0x19b/0x860 [ 42.314976] kasan_end_report+0x47/0x4f [ 42.318928] kasan_report.cold.7+0xc9/0x2f5 [ 42.323226] check_memory_region+0x13e/0x1b0 [ 42.327613] kasan_check_write+0x14/0x20 [ 42.331649] skb_release_data+0x19b/0x860 [ 42.335778] ? skb_tx_error+0x2f0/0x2f0 [ 42.339724] ? kasan_check_read+0x11/0x20 [ 42.343848] ? rcu_is_watching+0x85/0x140 [ 42.347972] ? kasan_check_write+0x14/0x20 [ 42.352184] ? sock_rmem_free+0x6f/0x90 [ 42.356136] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 42.361654] skb_release_all+0x4a/0x60 [ 42.365515] kfree_skb+0x195/0x560 [ 42.369027] ? skb_queue_purge+0x19/0x40 [ 42.373064] ? __kfree_skb+0x20/0x20 [ 42.376757] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 42.381317] ? _raw_spin_unlock_irqrestore+0x74/0xc0 [ 42.386395] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 42.391384] ? trace_hardirqs_on+0xd/0x10 [ 42.395508] ? skb_dequeue+0x12f/0x180 [ 42.399372] skb_queue_purge+0x19/0x40 [ 42.403236] packet_sock_destruct+0x93/0x290 [ 42.407617] ? packet_mm_close+0xc0/0xc0 [ 42.411651] ? graph_lock+0x170/0x170 [ 42.415427] ? __free_object+0x16e/0x330 [ 42.419460] ? __list_del_entry_valid.cold.1+0x58/0x58 [ 42.424712] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 42.429269] ? packet_mm_close+0xc0/0xc0 [ 42.433303] __sk_destruct+0xff/0xa40 [ 42.437079] ? sock_warn_obsolete_bsdism+0xb0/0xb0 [ 42.441992] ? graph_lock+0x170/0x170 [ 42.445769] ? lock_downgrade+0x8e0/0x8e0 [ 42.449891] ? __lock_is_held+0xb5/0x140 [ 42.453930] ? kasan_check_read+0x11/0x20 [ 42.458052] ? do_raw_spin_unlock+0x9e/0x2e0 [ 42.462440] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 42.467001] ? _raw_spin_unlock_irqrestore+0x74/0xc0 [ 42.472081] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 42.477606] ? refcount_sub_and_test+0x212/0x330 [ 42.482339] ? refcount_inc_not_zero+0x2d0/0x2d0 [ 42.487069] ? refcount_inc_not_zero+0x2d0/0x2d0 [ 42.491803] ? pcpu_free_area+0xa90/0xa90 [ 42.495926] sk_destruct+0x78/0x90 [ 42.499444] __sk_free+0x22e/0x340 [ 42.502959] sk_free+0x42/0x50 [ 42.506136] packet_release+0xa18/0xd50 [ 42.510088] ? lock_downgrade+0x8e0/0x8e0 [ 42.514211] ? packet_lookup_frame+0x270/0x270 [ 42.518773] ? cpumask_weight.constprop.5+0x44/0x44 [ 42.523766] ? do_raw_spin_lock+0xc1/0x200 [ 42.527981] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 42.533493] ? locks_remove_file+0x3f7/0x5a0 [ 42.537877] ? fcntl_setlk+0x1020/0x1020 [ 42.541913] ? fsnotify+0x415/0x1100 [ 42.545606] ? fsnotify_first_mark+0x330/0x330 [ 42.550165] sock_release+0x96/0x1b0 [ 42.553854] ? sock_alloc_file+0x4e0/0x4e0 [ 42.558063] sock_close+0x16/0x20 [ 42.561490] __fput+0x34d/0x890 [ 42.564747] ? fput+0x1a0/0x1a0 [ 42.568008] ? check_same_owner+0x320/0x320 [ 42.572306] ____fput+0x15/0x20 [ 42.575571] task_work_run+0x1e4/0x290 [ 42.579439] ? task_work_cancel+0x240/0x240 [ 42.583738] ? switch_task_namespaces+0xbd/0xd0 [ 42.588385] do_exit+0x1aee/0x2730 [ 42.591901] ? find_held_lock+0x36/0x1c0 [ 42.595940] ? mm_update_next_owner+0x980/0x980 [ 42.600587] ? kasan_check_read+0x11/0x20 [ 42.604714] ? rcu_is_watching+0x85/0x140 [ 42.608836] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 42.614005] ? tun_get+0x22b/0x360 [ 42.617519] ? tun_chr_close+0x60/0x60 [ 42.621386] ? tun_chr_write_iter+0x110/0x154 [ 42.625858] ? fsnotify+0x415/0x1100 [ 42.629553] ? kasan_check_read+0x11/0x20 [ 42.633676] ? rcu_is_watching+0x85/0x140 [ 42.637798] ? rcu_pm_notify+0xc0/0xc0 [ 42.641663] ? vfs_writev+0x255/0x330 [ 42.645441] ? rcu_read_lock_sched_held+0x108/0x120 [ 42.650449] ? kfree+0x1e9/0x260 [ 42.653793] ? vfs_writev+0xfc/0x330 [ 42.657484] ? vfs_iter_write+0xb0/0xb0 [ 42.661436] ? lock_downgrade+0x8e0/0x8e0 [ 42.665563] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 42.671079] ? sockfd_lookup_light+0xc5/0x160 [ 42.675555] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 42.681087] ? __fdget_pos+0xd6/0x1e0 [ 42.684864] ? __fdget_raw+0x20/0x20 [ 42.688562] do_group_exit+0x16f/0x430 [ 42.692439] ? SyS_exit+0x30/0x30 [ 42.695871] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 42.700690] ? do_syscall_64+0xb7/0x9d0 [ 42.704640] ? do_group_exit+0x430/0x430 [ 42.708683] SyS_exit_group+0x1d/0x20 [ 42.712461] do_syscall_64+0x29e/0x9d0 [ 42.716323] ? vmalloc_sync_all+0x30/0x30 [ 42.720461] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 42.725205] ? syscall_return_slowpath+0x5c0/0x5c0 [ 42.730112] ? syscall_return_slowpath+0x30f/0x5c0 [ 42.735018] ? entry_SYSCALL_64_after_hwframe+0x52/0xb7 [ 42.740357] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 42.745176] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 42.750340] RIP: 0033:0x4419a9 [ 42.753507] RSP: 002b:00007ffcbe3cbda8 EFLAGS: 00000202 ORIG_RAX: 00000000000000e7 [ 42.761191] RAX: ffffffffffffffda RBX: 000000000000001b RCX: 00000000004419a9 [ 42.768436] RDX: 00000000004418e0 RSI: 0000000000000001 RDI: 0000000000000001 [ 42.775680] RBP: 00000000004a35c9 R08: 0000000000000020 R09: 00000000006cd018 [ 42.782924] R10: 0000000000000000 R11: 0000000000000202 R12: 00007ffcbe3cbea8 [ 42.790183] R13: 0000000000402730 R14: 0000000000000000 R15: 0000000000000000 [ 42.797878] Dumping ftrace buffer: [ 42.801395] (ftrace buffer empty) [ 42.805079] Kernel Offset: disabled [ 42.808683] Rebooting in 86400 seconds..