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 '10.128.10.23' (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: [ 26.344350] IPVS: ftp: loaded support on port[0] = 21 RTNETLINK answers: Operation not supported RTNETLINK answers: No buffer space available RTNETLINK answers: Operation not supported [ 26.600342] 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 [ 26.969371] IPv6: ADDRCONF(NETDEV_UP): bond0: link is not ready [ 26.975484] 8021q: adding VLAN 0 to HW filter on device bond0 [ 27.015636] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 27.056263] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 27.098067] IPv6: ADDRCONF(NETDEV_UP): team0: link is not ready [ 27.104337] 8021q: adding VLAN 0 to HW filter on device team0 [ 27.131417] bond0: Enslaving bond_slave as an active interface with an up link [ 27.140436] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready executing program [ 27.158256] team0: Port device team_slave added [ 27.163554] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 27.208118] ================================================================== [ 27.215544] BUG: KASAN: use-after-free in skb_release_data+0x19b/0x860 [ 27.222194] Write of size 4 at addr ffff8801d88c1b60 by task syzkaller432778/4468 [ 27.229787] [ 27.231395] CPU: 0 PID: 4468 Comm: syzkaller432778 Not tainted 4.16.0+ #17 [ 27.238385] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.247714] Call Trace: [ 27.250297] dump_stack+0x1b9/0x294 [ 27.253904] ? dump_stack_print_info.cold.2+0x52/0x52 [ 27.259080] ? printk+0x9e/0xba [ 27.262340] ? kmsg_dump_rewind_nolock+0xe4/0xe4 [ 27.267083] ? kasan_check_write+0x14/0x20 [ 27.271300] print_address_description+0x6c/0x20b [ 27.276121] ? skb_release_data+0x19b/0x860 [ 27.280421] kasan_report.cold.7+0xac/0x2f5 [ 27.284727] check_memory_region+0x13e/0x1b0 [ 27.289114] kasan_check_write+0x14/0x20 [ 27.293155] skb_release_data+0x19b/0x860 [ 27.297285] ? skb_tx_error+0x2f0/0x2f0 [ 27.301245] ? kasan_check_read+0x11/0x20 [ 27.305374] ? rcu_is_watching+0x85/0x140 [ 27.309501] ? kasan_check_write+0x14/0x20 [ 27.313720] ? sock_rmem_free+0x6f/0x90 [ 27.317677] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 27.323195] skb_release_all+0x4a/0x60 [ 27.327061] kfree_skb+0x195/0x560 [ 27.330579] ? skb_queue_purge+0x19/0x40 [ 27.334617] ? __kfree_skb+0x20/0x20 [ 27.338311] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 27.342874] ? _raw_spin_unlock_irqrestore+0x74/0xc0 [ 27.347958] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 27.352950] ? trace_hardirqs_on+0xd/0x10 [ 27.357085] ? skb_dequeue+0x12f/0x180 [ 27.360950] skb_queue_purge+0x19/0x40 [ 27.364816] packet_sock_destruct+0x93/0x290 [ 27.369204] ? packet_mm_close+0xc0/0xc0 [ 27.373245] ? graph_lock+0x170/0x170 [ 27.377032] ? __free_object+0x16e/0x330 [ 27.381071] ? __list_del_entry_valid.cold.1+0x58/0x58 [ 27.386328] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 27.390888] ? packet_mm_close+0xc0/0xc0 [ 27.394927] __sk_destruct+0xff/0xa40 [ 27.398723] ? sock_warn_obsolete_bsdism+0xb0/0xb0 [ 27.403630] ? graph_lock+0x170/0x170 [ 27.407408] ? lock_downgrade+0x8e0/0x8e0 [ 27.411534] ? __lock_is_held+0xb5/0x140 [ 27.415577] ? kasan_check_read+0x11/0x20 [ 27.419719] ? do_raw_spin_unlock+0x9e/0x2e0 [ 27.424107] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 27.428675] ? _raw_spin_unlock_irqrestore+0x74/0xc0 [ 27.433757] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 27.439278] ? refcount_sub_and_test+0x212/0x330 [ 27.444024] ? refcount_inc_not_zero+0x2d0/0x2d0 [ 27.448764] ? refcount_inc_not_zero+0x2d0/0x2d0 [ 27.453496] ? pcpu_free_area+0xa90/0xa90 [ 27.457633] sk_destruct+0x78/0x90 [ 27.461153] __sk_free+0x22e/0x340 [ 27.464687] sk_free+0x42/0x50 [ 27.467863] packet_release+0xa18/0xd50 [ 27.471817] ? lock_downgrade+0x8e0/0x8e0 [ 27.475945] ? packet_lookup_frame+0x270/0x270 [ 27.480506] ? cpumask_weight.constprop.5+0x44/0x44 [ 27.485500] ? do_raw_spin_lock+0xc1/0x200 [ 27.489717] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 27.495232] ? locks_remove_file+0x3f7/0x5a0 [ 27.499622] ? fcntl_setlk+0x1020/0x1020 [ 27.503663] ? fsnotify+0x415/0x1100 [ 27.507358] ? fsnotify_first_mark+0x330/0x330 [ 27.511921] sock_release+0x96/0x1b0 [ 27.515617] ? sock_alloc_file+0x4e0/0x4e0 [ 27.519829] sock_close+0x16/0x20 [ 27.523263] __fput+0x34d/0x890 [ 27.526520] ? fput+0x1a0/0x1a0 [ 27.529783] ? check_same_owner+0x320/0x320 [ 27.534084] ____fput+0x15/0x20 [ 27.537340] task_work_run+0x1e4/0x290 [ 27.541208] ? task_work_cancel+0x240/0x240 [ 27.545511] ? switch_task_namespaces+0xbd/0xd0 [ 27.550159] do_exit+0x1aee/0x2730 [ 27.553675] ? find_held_lock+0x36/0x1c0 [ 27.557719] ? mm_update_next_owner+0x980/0x980 [ 27.562373] ? kasan_check_read+0x11/0x20 [ 27.566502] ? rcu_is_watching+0x85/0x140 [ 27.570630] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 27.575819] ? tun_get+0x22b/0x360 [ 27.579339] ? tun_chr_close+0x60/0x60 [ 27.583217] ? tun_chr_write_iter+0x110/0x154 [ 27.587711] ? fsnotify+0x415/0x1100 [ 27.591411] ? kasan_check_read+0x11/0x20 [ 27.595540] ? rcu_is_watching+0x85/0x140 [ 27.599669] ? rcu_pm_notify+0xc0/0xc0 [ 27.603547] ? vfs_writev+0x255/0x330 [ 27.607327] ? rcu_read_lock_sched_held+0x108/0x120 [ 27.612323] ? kfree+0x1e9/0x260 [ 27.615679] ? vfs_writev+0xfc/0x330 [ 27.619385] ? vfs_iter_write+0xb0/0xb0 [ 27.623352] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 27.628874] ? sockfd_lookup_light+0xc5/0x160 [ 27.633353] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 27.638873] ? __fdget_pos+0xd6/0x1e0 [ 27.642658] ? __fdget_raw+0x20/0x20 [ 27.646374] do_group_exit+0x16f/0x430 [ 27.650242] ? SyS_exit+0x30/0x30 [ 27.653679] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 27.658511] ? do_syscall_64+0xb7/0x9d0 [ 27.662465] ? do_group_exit+0x430/0x430 [ 27.666512] SyS_exit_group+0x1d/0x20 [ 27.670293] do_syscall_64+0x29e/0x9d0 [ 27.674161] ? vmalloc_sync_all+0x30/0x30 [ 27.678289] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 27.683038] ? syscall_return_slowpath+0x5c0/0x5c0 [ 27.687976] ? syscall_return_slowpath+0x30f/0x5c0 [ 27.692897] ? entry_SYSCALL_64_after_hwframe+0x52/0xb7 [ 27.698245] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 27.703077] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 27.708244] RIP: 0033:0x441979 [ 27.711414] RSP: 002b:00007ffeea1f3be8 EFLAGS: 00000206 ORIG_RAX: 00000000000000e7 [ 27.719102] RAX: ffffffffffffffda RBX: 000000000000001b RCX: 0000000000441979 [ 27.726351] RDX: 00000000004418b0 RSI: 0000000000000001 RDI: 0000000000000001 [ 27.733601] RBP: 00000000004a3589 R08: 0000000000000020 R09: 00000000006cd018 [ 27.740863] R10: 0000000000000000 R11: 0000000000000206 R12: 00007ffeea1f3ce8 [ 27.748116] R13: 0000000000402700 R14: 0000000000000000 R15: 0000000000000000 [ 27.755370] [ 27.756983] Allocated by task 4468: [ 27.760592] save_stack+0x43/0xd0 [ 27.764030] kasan_kmalloc+0xc4/0xe0 [ 27.767723] __kmalloc_node_track_caller+0x47/0x70 [ 27.772631] __kmalloc_reserve.isra.38+0x3a/0xe0 [ 27.777365] __alloc_skb+0x14d/0x780 [ 27.781058] alloc_skb_with_frags+0x137/0x760 [ 27.785543] sock_alloc_send_pskb+0x87a/0xae0 [ 27.790024] packet_sendmsg+0x1bd1/0x6100 [ 27.794156] sock_sendmsg+0xd5/0x120 [ 27.797850] ___sys_sendmsg+0x805/0x940 [ 27.801806] __sys_sendmsg+0x115/0x270 [ 27.805679] SyS_sendmsg+0x29/0x30 [ 27.809210] do_syscall_64+0x29e/0x9d0 [ 27.813086] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 27.818258] [ 27.819863] Freed by task 4468: [ 27.823122] save_stack+0x43/0xd0 [ 27.826551] __kasan_slab_free+0x11a/0x170 [ 27.830766] kasan_slab_free+0xe/0x10 [ 27.834549] kfree+0xd9/0x260 [ 27.837634] skb_free_head+0x99/0xc0 [ 27.841325] skb_release_data+0x690/0x860 [ 27.845450] skb_release_all+0x4a/0x60 [ 27.849317] kfree_skb+0x195/0x560 [ 27.852838] ip6_tnl_start_xmit+0xa44/0x2290 [ 27.857772] dev_hard_start_xmit+0x264/0xc10 [ 27.862157] __dev_queue_xmit+0x2724/0x34c0 [ 27.866458] dev_queue_xmit+0x17/0x20 [ 27.870248] packet_sendmsg+0x411d/0x6100 [ 27.874374] sock_sendmsg+0xd5/0x120 [ 27.878066] ___sys_sendmsg+0x805/0x940 [ 27.882023] __sys_sendmsg+0x115/0x270 [ 27.885892] SyS_sendmsg+0x29/0x30 [ 27.889418] do_syscall_64+0x29e/0x9d0 [ 27.893283] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 27.898446] [ 27.900053] The buggy address belongs to the object at ffff8801d88c1a80 [ 27.900053] which belongs to the cache kmalloc-512 of size 512 [ 27.912688] The buggy address is located 224 bytes inside of [ 27.912688] 512-byte region [ffff8801d88c1a80, ffff8801d88c1c80) [ 27.924540] The buggy address belongs to the page: [ 27.929448] page:ffffea0007623040 count:1 mapcount:0 mapping:ffff8801d88c1080 index:0x0 [ 27.937568] flags: 0x2fffc0000000100(slab) [ 27.941783] raw: 02fffc0000000100 ffff8801d88c1080 0000000000000000 0000000100000006 [ 27.949663] raw: ffffea0007626e60 ffffea0006c91ce0 ffff8801dac00940 0000000000000000 [ 27.957518] page dumped because: kasan: bad access detected [ 27.963200] [ 27.964805] Memory state around the buggy address: [ 27.969712] ffff8801d88c1a00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 27.977047] ffff8801d88c1a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 27.984383] >ffff8801d88c1b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 27.991725] ^ [ 27.998196] ffff8801d88c1b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 28.005532] ffff8801d88c1c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 28.012865] ================================================================== [ 28.020202] Disabling lock debugging due to kernel taint [ 28.026141] Kernel panic - not syncing: panic_on_warn set ... [ 28.026141] [ 28.033508] CPU: 0 PID: 4468 Comm: syzkaller432778 Tainted: G B 4.16.0+ #17 [ 28.041808] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.051148] Call Trace: [ 28.053717] dump_stack+0x1b9/0x294 [ 28.057321] ? dump_stack_print_info.cold.2+0x52/0x52 [ 28.062490] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 28.067226] ? skb_release_data+0xd0/0x860 [ 28.071445] panic+0x22f/0x4de [ 28.074613] ? add_taint.cold.5+0x16/0x16 [ 28.078738] ? do_raw_spin_unlock+0x9e/0x2e0 [ 28.083126] ? do_raw_spin_unlock+0x9e/0x2e0 [ 28.087517] ? skb_release_data+0x19b/0x860 [ 28.091817] kasan_end_report+0x47/0x4f [ 28.095769] kasan_report.cold.7+0xc9/0x2f5 [ 28.100078] check_memory_region+0x13e/0x1b0 [ 28.104463] kasan_check_write+0x14/0x20 [ 28.108511] skb_release_data+0x19b/0x860 [ 28.112640] ? skb_tx_error+0x2f0/0x2f0 [ 28.116592] ? kasan_check_read+0x11/0x20 [ 28.120719] ? rcu_is_watching+0x85/0x140 [ 28.124847] ? kasan_check_write+0x14/0x20 [ 28.129061] ? sock_rmem_free+0x6f/0x90 [ 28.133023] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 28.138542] skb_release_all+0x4a/0x60 [ 28.142407] kfree_skb+0x195/0x560 [ 28.145921] ? skb_queue_purge+0x19/0x40 [ 28.149960] ? __kfree_skb+0x20/0x20 [ 28.153654] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 28.158223] ? _raw_spin_unlock_irqrestore+0x74/0xc0 [ 28.163312] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 28.168309] ? trace_hardirqs_on+0xd/0x10 [ 28.172436] ? skb_dequeue+0x12f/0x180 [ 28.176300] skb_queue_purge+0x19/0x40 [ 28.180167] packet_sock_destruct+0x93/0x290 [ 28.184557] ? packet_mm_close+0xc0/0xc0 [ 28.188593] ? graph_lock+0x170/0x170 [ 28.192370] ? __free_object+0x16e/0x330 [ 28.196408] ? __list_del_entry_valid.cold.1+0x58/0x58 [ 28.201660] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 28.206218] ? packet_mm_close+0xc0/0xc0 [ 28.210265] __sk_destruct+0xff/0xa40 [ 28.214053] ? sock_warn_obsolete_bsdism+0xb0/0xb0 [ 28.218957] ? graph_lock+0x170/0x170 [ 28.222743] ? lock_downgrade+0x8e0/0x8e0 [ 28.226868] ? __lock_is_held+0xb5/0x140 [ 28.230908] ? kasan_check_read+0x11/0x20 [ 28.235033] ? do_raw_spin_unlock+0x9e/0x2e0 [ 28.239417] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 28.243977] ? _raw_spin_unlock_irqrestore+0x74/0xc0 [ 28.249063] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 28.254580] ? refcount_sub_and_test+0x212/0x330 [ 28.259325] ? refcount_inc_not_zero+0x2d0/0x2d0 [ 28.264064] ? refcount_inc_not_zero+0x2d0/0x2d0 [ 28.268796] ? pcpu_free_area+0xa90/0xa90 [ 28.272923] sk_destruct+0x78/0x90 [ 28.276439] __sk_free+0x22e/0x340 [ 28.279958] sk_free+0x42/0x50 [ 28.283128] packet_release+0xa18/0xd50 [ 28.287085] ? lock_downgrade+0x8e0/0x8e0 [ 28.291210] ? packet_lookup_frame+0x270/0x270 [ 28.295771] ? cpumask_weight.constprop.5+0x44/0x44 [ 28.300764] ? do_raw_spin_lock+0xc1/0x200 [ 28.304979] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 28.310496] ? locks_remove_file+0x3f7/0x5a0 [ 28.314881] ? fcntl_setlk+0x1020/0x1020 [ 28.318921] ? fsnotify+0x415/0x1100 [ 28.322633] ? fsnotify_first_mark+0x330/0x330 [ 28.327197] sock_release+0x96/0x1b0 [ 28.330892] ? sock_alloc_file+0x4e0/0x4e0 [ 28.335110] sock_close+0x16/0x20 [ 28.338542] __fput+0x34d/0x890 [ 28.341800] ? fput+0x1a0/0x1a0 [ 28.345061] ? check_same_owner+0x320/0x320 [ 28.349361] ____fput+0x15/0x20 [ 28.352624] task_work_run+0x1e4/0x290 [ 28.356491] ? task_work_cancel+0x240/0x240 [ 28.360792] ? switch_task_namespaces+0xbd/0xd0 [ 28.365439] do_exit+0x1aee/0x2730 [ 28.368956] ? find_held_lock+0x36/0x1c0 [ 28.372997] ? mm_update_next_owner+0x980/0x980 [ 28.377652] ? kasan_check_read+0x11/0x20 [ 28.381778] ? rcu_is_watching+0x85/0x140 [ 28.385922] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 28.391113] ? tun_get+0x22b/0x360 [ 28.394634] ? tun_chr_close+0x60/0x60 [ 28.398502] ? tun_chr_write_iter+0x110/0x154 [ 28.402977] ? fsnotify+0x415/0x1100 [ 28.406674] ? kasan_check_read+0x11/0x20 [ 28.410800] ? rcu_is_watching+0x85/0x140 [ 28.414932] ? rcu_pm_notify+0xc0/0xc0 [ 28.418799] ? vfs_writev+0x255/0x330 [ 28.422577] ? rcu_read_lock_sched_held+0x108/0x120 [ 28.427567] ? kfree+0x1e9/0x260 [ 28.430911] ? vfs_writev+0xfc/0x330 [ 28.434609] ? vfs_iter_write+0xb0/0xb0 [ 28.438573] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 28.444088] ? sockfd_lookup_light+0xc5/0x160 [ 28.448563] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 28.454088] ? __fdget_pos+0xd6/0x1e0 [ 28.457866] ? __fdget_raw+0x20/0x20 [ 28.461559] do_group_exit+0x16f/0x430 [ 28.465428] ? SyS_exit+0x30/0x30 [ 28.468865] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 28.473687] ? do_syscall_64+0xb7/0x9d0 [ 28.477639] ? do_group_exit+0x430/0x430 [ 28.481678] SyS_exit_group+0x1d/0x20 [ 28.485455] do_syscall_64+0x29e/0x9d0 [ 28.489317] ? vmalloc_sync_all+0x30/0x30 [ 28.493449] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 28.498181] ? syscall_return_slowpath+0x5c0/0x5c0 [ 28.503093] ? syscall_return_slowpath+0x30f/0x5c0 [ 28.508010] ? entry_SYSCALL_64_after_hwframe+0x52/0xb7 [ 28.513360] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 28.518189] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 28.523356] RIP: 0033:0x441979 [ 28.526522] RSP: 002b:00007ffeea1f3be8 EFLAGS: 00000206 ORIG_RAX: 00000000000000e7 [ 28.534207] RAX: ffffffffffffffda RBX: 000000000000001b RCX: 0000000000441979 [ 28.541459] RDX: 00000000004418b0 RSI: 0000000000000001 RDI: 0000000000000001 [ 28.548705] RBP: 00000000004a3589 R08: 0000000000000020 R09: 00000000006cd018 [ 28.555956] R10: 0000000000000000 R11: 0000000000000206 R12: 00007ffeea1f3ce8 [ 28.563213] R13: 0000000000402700 R14: 0000000000000000 R15: 0000000000000000 [ 28.570595] Dumping ftrace buffer: [ 28.574119] (ftrace buffer empty) [ 28.577805] Kernel Offset: disabled [ 28.581414] Rebooting in 86400 seconds..