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 '10.128.10.2' (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: [ 30.663462] IPVS: ftp: loaded support on port[0] = 21 [ 30.754340] ip (4508) used greatest stack depth: 17128 bytes left RTNETLINK answers: Operation not supported RTNETLINK answers: No buffer space available RTNETLINK answers: Operation not supported [ 30.891680] ip (4537) used greatest stack depth: 16648 bytes left [ 30.928313] 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 [ 31.302113] IPv6: ADDRCONF(NETDEV_UP): bond0: link is not ready [ 31.308204] 8021q: adding VLAN 0 to HW filter on device bond0 [ 31.347495] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 31.388192] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 31.428957] IPv6: ADDRCONF(NETDEV_UP): team0: link is not ready [ 31.435202] 8021q: adding VLAN 0 to HW filter on device team0 [ 31.463802] bond0: Enslaving bond_slave as an active interface with an up link [ 31.472366] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready executing program [ 31.490271] team0: Port device team_slave added [ 31.495558] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 31.502869] ip (4663) used greatest stack depth: 15528 bytes left [ 31.536126] ================================================================== [ 31.543550] BUG: KASAN: use-after-free in skb_release_data+0x19b/0x860 [ 31.550195] Write of size 4 at addr ffff8801d4004360 by task syzkaller128104/4492 [ 31.557790] [ 31.559400] CPU: 0 PID: 4492 Comm: syzkaller128104 Not tainted 4.16.0+ #17 [ 31.566386] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.575716] Call Trace: [ 31.578288] dump_stack+0x1b9/0x294 [ 31.581897] ? dump_stack_print_info.cold.2+0x52/0x52 [ 31.587074] ? printk+0x9e/0xba [ 31.590334] ? kmsg_dump_rewind_nolock+0xe4/0xe4 [ 31.595068] ? kasan_check_write+0x14/0x20 [ 31.599284] print_address_description+0x6c/0x20b [ 31.604106] ? skb_release_data+0x19b/0x860 [ 31.608407] kasan_report.cold.7+0xac/0x2f5 [ 31.612708] check_memory_region+0x13e/0x1b0 [ 31.617106] kasan_check_write+0x14/0x20 [ 31.621143] skb_release_data+0x19b/0x860 [ 31.625271] ? skb_tx_error+0x2f0/0x2f0 [ 31.629224] ? kasan_check_read+0x11/0x20 [ 31.633350] ? rcu_is_watching+0x85/0x140 [ 31.637483] ? kasan_check_write+0x14/0x20 [ 31.641698] ? sock_rmem_free+0x6f/0x90 [ 31.645658] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 31.651176] skb_release_all+0x4a/0x60 [ 31.655043] kfree_skb+0x195/0x560 [ 31.658559] ? skb_queue_purge+0x19/0x40 [ 31.662598] ? __kfree_skb+0x20/0x20 [ 31.666290] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 31.670851] ? _raw_spin_unlock_irqrestore+0x74/0xc0 [ 31.675939] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 31.680935] ? trace_hardirqs_on+0xd/0x10 [ 31.685063] ? skb_dequeue+0x12f/0x180 [ 31.688928] skb_queue_purge+0x19/0x40 [ 31.692793] packet_sock_destruct+0x93/0x290 [ 31.697180] ? packet_mm_close+0xc0/0xc0 [ 31.701218] ? graph_lock+0x170/0x170 [ 31.704996] ? __free_object+0x16e/0x330 [ 31.709041] ? __list_del_entry_valid.cold.1+0x58/0x58 [ 31.714295] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 31.718853] ? packet_mm_close+0xc0/0xc0 [ 31.722891] __sk_destruct+0xff/0xa40 [ 31.726671] ? sock_warn_obsolete_bsdism+0xb0/0xb0 [ 31.731580] ? graph_lock+0x170/0x170 [ 31.735358] ? lock_downgrade+0x8e0/0x8e0 [ 31.739483] ? __lock_is_held+0xb5/0x140 [ 31.743521] ? kasan_check_read+0x11/0x20 [ 31.747647] ? do_raw_spin_unlock+0x9e/0x2e0 [ 31.752036] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 31.756599] ? _raw_spin_unlock_irqrestore+0x74/0xc0 [ 31.761682] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.767202] ? refcount_sub_and_test+0x212/0x330 [ 31.771936] ? refcount_inc_not_zero+0x2d0/0x2d0 [ 31.776671] ? refcount_inc_not_zero+0x2d0/0x2d0 [ 31.781406] ? pcpu_free_area+0xa90/0xa90 [ 31.785539] sk_destruct+0x78/0x90 [ 31.789058] __sk_free+0x22e/0x340 [ 31.792578] sk_free+0x42/0x50 [ 31.795753] packet_release+0xa18/0xd50 [ 31.799711] ? lock_downgrade+0x8e0/0x8e0 [ 31.803842] ? packet_lookup_frame+0x270/0x270 [ 31.808406] ? cpumask_weight.constprop.5+0x44/0x44 [ 31.813403] ? do_raw_spin_lock+0xc1/0x200 [ 31.817629] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 31.823146] ? locks_remove_file+0x3f7/0x5a0 [ 31.827536] ? fcntl_setlk+0x1020/0x1020 [ 31.831577] ? fsnotify+0x415/0x1100 [ 31.835274] ? fsnotify_first_mark+0x330/0x330 [ 31.839839] sock_release+0x96/0x1b0 [ 31.843534] ? sock_alloc_file+0x4e0/0x4e0 [ 31.847757] sock_close+0x16/0x20 [ 31.851190] __fput+0x34d/0x890 [ 31.854449] ? fput+0x1a0/0x1a0 [ 31.857716] ? check_same_owner+0x320/0x320 [ 31.862033] ____fput+0x15/0x20 [ 31.865294] task_work_run+0x1e4/0x290 [ 31.869166] ? task_work_cancel+0x240/0x240 [ 31.873470] ? switch_task_namespaces+0xbd/0xd0 [ 31.878120] do_exit+0x1aee/0x2730 [ 31.881638] ? lock_release+0xa10/0xa10 [ 31.885591] ? mm_update_next_owner+0x980/0x980 [ 31.890242] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 31.895757] ? import_iovec+0x24b/0x420 [ 31.899713] ? dup_iter+0x270/0x270 [ 31.903321] ? kasan_check_read+0x11/0x20 [ 31.907450] ? rcu_is_watching+0x85/0x140 [ 31.911577] ? rcu_pm_notify+0xc0/0xc0 [ 31.915449] ? ___sys_sendmsg+0x31a/0x940 [ 31.919575] ? kfree+0x1e9/0x260 [ 31.922920] ? ___sys_sendmsg+0x31f/0x940 [ 31.927049] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.932570] ? copy_msghdr_from_user+0x560/0x560 [ 31.937317] ? vm_insert_mixed_mkwrite+0x40/0x40 [ 31.942050] ? graph_lock+0x170/0x170 [ 31.945828] ? graph_lock+0x170/0x170 [ 31.949606] ? find_held_lock+0x36/0x1c0 [ 31.953653] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.959170] ? __fget_light+0x2ef/0x430 [ 31.963122] ? fget_raw+0x20/0x20 [ 31.966553] ? find_held_lock+0x36/0x1c0 [ 31.970707] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 31.976224] ? sockfd_lookup_light+0xc5/0x160 [ 31.980711] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.986225] ? __sys_sendmsg+0x1aa/0x270 [ 31.990264] ? SyS_shutdown+0x30/0x30 [ 31.994048] ? __do_page_fault+0x441/0xe40 [ 31.998271] do_group_exit+0x16f/0x430 [ 32.002140] ? SyS_exit+0x30/0x30 [ 32.005573] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 32.010403] ? do_syscall_64+0xb7/0x9d0 [ 32.014356] ? do_group_exit+0x430/0x430 [ 32.018398] SyS_exit_group+0x1d/0x20 [ 32.022183] do_syscall_64+0x29e/0x9d0 [ 32.026052] ? vmalloc_sync_all+0x30/0x30 [ 32.030178] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 32.034911] ? syscall_return_slowpath+0x5c0/0x5c0 [ 32.039820] ? syscall_return_slowpath+0x30f/0x5c0 [ 32.044731] ? entry_SYSCALL_64_after_hwframe+0x52/0xb7 [ 32.050078] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 32.054903] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 32.060071] RIP: 0033:0x441609 [ 32.063238] RSP: 002b:00007ffea47be2e8 EFLAGS: 00000206 ORIG_RAX: 00000000000000e7 [ 32.070924] RAX: ffffffffffffffda RBX: 000000000000001b RCX: 0000000000441609 [ 32.078173] RDX: 0000000000441609 RSI: 0000000000000000 RDI: 0000000000000001 [ 32.085420] RBP: 00000000004a3229 R08: 0000000000000000 R09: 00000000006cd018 [ 32.092666] R10: 0000000000000000 R11: 0000000000000206 R12: 00007ffea47be3d8 [ 32.099914] R13: 0000000000402390 R14: 0000000000000000 R15: 0000000000000000 [ 32.107169] [ 32.108776] Allocated by task 4492: [ 32.112384] save_stack+0x43/0xd0 [ 32.115812] kasan_kmalloc+0xc4/0xe0 [ 32.119501] __kmalloc_node_track_caller+0x47/0x70 [ 32.124410] __kmalloc_reserve.isra.38+0x3a/0xe0 [ 32.129146] __alloc_skb+0x14d/0x780 [ 32.132840] alloc_skb_with_frags+0x137/0x760 [ 32.137311] sock_alloc_send_pskb+0x87a/0xae0 [ 32.141793] packet_sendmsg+0x1bd1/0x6100 [ 32.145926] sock_sendmsg+0xd5/0x120 [ 32.149624] ___sys_sendmsg+0x805/0x940 [ 32.153578] __sys_sendmsg+0x115/0x270 [ 32.157442] SyS_sendmsg+0x29/0x30 [ 32.160962] do_syscall_64+0x29e/0x9d0 [ 32.164834] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 32.169994] [ 32.171601] Freed by task 4492: [ 32.174861] save_stack+0x43/0xd0 [ 32.178290] __kasan_slab_free+0x11a/0x170 [ 32.182502] kasan_slab_free+0xe/0x10 [ 32.186278] kfree+0xd9/0x260 [ 32.189360] skb_free_head+0x99/0xc0 [ 32.193051] skb_release_data+0x690/0x860 [ 32.197184] skb_release_all+0x4a/0x60 [ 32.201048] kfree_skb+0x195/0x560 [ 32.204566] ip6_tnl_start_xmit+0xa44/0x2290 [ 32.208951] dev_hard_start_xmit+0x264/0xc10 [ 32.213335] __dev_queue_xmit+0x2724/0x34c0 [ 32.217642] dev_queue_xmit+0x17/0x20 [ 32.221427] packet_sendmsg+0x411d/0x6100 [ 32.225554] sock_sendmsg+0xd5/0x120 [ 32.229246] ___sys_sendmsg+0x805/0x940 [ 32.233197] __sys_sendmsg+0x115/0x270 [ 32.237068] SyS_sendmsg+0x29/0x30 [ 32.240589] do_syscall_64+0x29e/0x9d0 [ 32.244454] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 32.249619] [ 32.251225] The buggy address belongs to the object at ffff8801d4004280 [ 32.251225] which belongs to the cache kmalloc-512 of size 512 [ 32.263872] The buggy address is located 224 bytes inside of [ 32.263872] 512-byte region [ffff8801d4004280, ffff8801d4004480) [ 32.275723] The buggy address belongs to the page: [ 32.280630] page:ffffea0007500100 count:1 mapcount:0 mapping:ffff8801d4004000 index:0x0 [ 32.288749] flags: 0x2fffc0000000100(slab) [ 32.292964] raw: 02fffc0000000100 ffff8801d4004000 0000000000000000 0000000100000006 [ 32.300825] raw: ffffea0007500060 ffffea0007500160 ffff8801dac00940 0000000000000000 [ 32.308678] page dumped because: kasan: bad access detected [ 32.314359] [ 32.315961] Memory state around the buggy address: [ 32.320877] ffff8801d4004200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 32.328212] ffff8801d4004280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 32.335547] >ffff8801d4004300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 32.342878] ^ [ 32.349346] ffff8801d4004380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 32.356681] ffff8801d4004400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 32.364023] ================================================================== [ 32.371359] Disabling lock debugging due to kernel taint [ 32.377303] Kernel panic - not syncing: panic_on_warn set ... [ 32.377303] [ 32.384682] CPU: 0 PID: 4492 Comm: syzkaller128104 Tainted: G B 4.16.0+ #17 [ 32.392987] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.402322] Call Trace: [ 32.404892] dump_stack+0x1b9/0x294 [ 32.408497] ? dump_stack_print_info.cold.2+0x52/0x52 [ 32.413680] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 32.418421] ? skb_release_data+0xd0/0x860 [ 32.422630] panic+0x22f/0x4de [ 32.425810] ? add_taint.cold.5+0x16/0x16 [ 32.429936] ? do_raw_spin_unlock+0x9e/0x2e0 [ 32.434318] ? do_raw_spin_unlock+0x9e/0x2e0 [ 32.438710] ? skb_release_data+0x19b/0x860 [ 32.443023] kasan_end_report+0x47/0x4f [ 32.446974] kasan_report.cold.7+0xc9/0x2f5 [ 32.451273] check_memory_region+0x13e/0x1b0 [ 32.455662] kasan_check_write+0x14/0x20 [ 32.459697] skb_release_data+0x19b/0x860 [ 32.463823] ? skb_tx_error+0x2f0/0x2f0 [ 32.467773] ? kasan_check_read+0x11/0x20 [ 32.471899] ? rcu_is_watching+0x85/0x140 [ 32.476029] ? kasan_check_write+0x14/0x20 [ 32.480245] ? sock_rmem_free+0x6f/0x90 [ 32.484198] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 32.489713] skb_release_all+0x4a/0x60 [ 32.493580] kfree_skb+0x195/0x560 [ 32.497094] ? skb_queue_purge+0x19/0x40 [ 32.501131] ? __kfree_skb+0x20/0x20 [ 32.504826] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 32.509387] ? _raw_spin_unlock_irqrestore+0x74/0xc0 [ 32.514476] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 32.519468] ? trace_hardirqs_on+0xd/0x10 [ 32.523594] ? skb_dequeue+0x12f/0x180 [ 32.527456] skb_queue_purge+0x19/0x40 [ 32.531321] packet_sock_destruct+0x93/0x290 [ 32.535706] ? packet_mm_close+0xc0/0xc0 [ 32.539751] ? graph_lock+0x170/0x170 [ 32.543527] ? __free_object+0x16e/0x330 [ 32.547562] ? __list_del_entry_valid.cold.1+0x58/0x58 [ 32.552817] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 32.557384] ? packet_mm_close+0xc0/0xc0 [ 32.561423] __sk_destruct+0xff/0xa40 [ 32.565200] ? sock_warn_obsolete_bsdism+0xb0/0xb0 [ 32.570112] ? graph_lock+0x170/0x170 [ 32.573887] ? lock_downgrade+0x8e0/0x8e0 [ 32.578013] ? __lock_is_held+0xb5/0x140 [ 32.582057] ? kasan_check_read+0x11/0x20 [ 32.586186] ? do_raw_spin_unlock+0x9e/0x2e0 [ 32.590570] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 32.595129] ? _raw_spin_unlock_irqrestore+0x74/0xc0 [ 32.600209] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.605724] ? refcount_sub_and_test+0x212/0x330 [ 32.610455] ? refcount_inc_not_zero+0x2d0/0x2d0 [ 32.615194] ? refcount_inc_not_zero+0x2d0/0x2d0 [ 32.619926] ? pcpu_free_area+0xa90/0xa90 [ 32.624052] sk_destruct+0x78/0x90 [ 32.627567] __sk_free+0x22e/0x340 [ 32.631086] sk_free+0x42/0x50 [ 32.634256] packet_release+0xa18/0xd50 [ 32.638204] ? lock_downgrade+0x8e0/0x8e0 [ 32.642328] ? packet_lookup_frame+0x270/0x270 [ 32.646885] ? cpumask_weight.constprop.5+0x44/0x44 [ 32.651875] ? do_raw_spin_lock+0xc1/0x200 [ 32.656087] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 32.661600] ? locks_remove_file+0x3f7/0x5a0 [ 32.665983] ? fcntl_setlk+0x1020/0x1020 [ 32.670027] ? fsnotify+0x415/0x1100 [ 32.673721] ? fsnotify_first_mark+0x330/0x330 [ 32.678280] sock_release+0x96/0x1b0 [ 32.681984] ? sock_alloc_file+0x4e0/0x4e0 [ 32.686197] sock_close+0x16/0x20 [ 32.689630] __fput+0x34d/0x890 [ 32.692885] ? fput+0x1a0/0x1a0 [ 32.696144] ? check_same_owner+0x320/0x320 [ 32.700441] ____fput+0x15/0x20 [ 32.703698] task_work_run+0x1e4/0x290 [ 32.707562] ? task_work_cancel+0x240/0x240 [ 32.711861] ? switch_task_namespaces+0xbd/0xd0 [ 32.716505] do_exit+0x1aee/0x2730 [ 32.720026] ? lock_release+0xa10/0xa10 [ 32.723981] ? mm_update_next_owner+0x980/0x980 [ 32.728649] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 32.734163] ? import_iovec+0x24b/0x420 [ 32.738113] ? dup_iter+0x270/0x270 [ 32.741721] ? kasan_check_read+0x11/0x20 [ 32.745844] ? rcu_is_watching+0x85/0x140 [ 32.749969] ? rcu_pm_notify+0xc0/0xc0 [ 32.753854] ? ___sys_sendmsg+0x31a/0x940 [ 32.757982] ? kfree+0x1e9/0x260 [ 32.761332] ? ___sys_sendmsg+0x31f/0x940 [ 32.765457] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.770973] ? copy_msghdr_from_user+0x560/0x560 [ 32.775706] ? vm_insert_mixed_mkwrite+0x40/0x40 [ 32.780446] ? graph_lock+0x170/0x170 [ 32.784220] ? graph_lock+0x170/0x170 [ 32.787997] ? find_held_lock+0x36/0x1c0 [ 32.792043] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.797558] ? __fget_light+0x2ef/0x430 [ 32.801505] ? fget_raw+0x20/0x20 [ 32.804935] ? find_held_lock+0x36/0x1c0 [ 32.808977] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 32.814490] ? sockfd_lookup_light+0xc5/0x160 [ 32.818963] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.824482] ? __sys_sendmsg+0x1aa/0x270 [ 32.828520] ? SyS_shutdown+0x30/0x30 [ 32.832299] ? __do_page_fault+0x441/0xe40 [ 32.836512] do_group_exit+0x16f/0x430 [ 32.840374] ? SyS_exit+0x30/0x30 [ 32.843804] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 32.848626] ? do_syscall_64+0xb7/0x9d0 [ 32.852574] ? do_group_exit+0x430/0x430 [ 32.856613] SyS_exit_group+0x1d/0x20 [ 32.860392] do_syscall_64+0x29e/0x9d0 [ 32.864254] ? vmalloc_sync_all+0x30/0x30 [ 32.868466] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 32.873202] ? syscall_return_slowpath+0x5c0/0x5c0 [ 32.878107] ? syscall_return_slowpath+0x30f/0x5c0 [ 32.883021] ? entry_SYSCALL_64_after_hwframe+0x52/0xb7 [ 32.888366] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 32.893186] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 32.898350] RIP: 0033:0x441609 [ 32.901516] RSP: 002b:00007ffea47be2e8 EFLAGS: 00000206 ORIG_RAX: 00000000000000e7 [ 32.909205] RAX: ffffffffffffffda RBX: 000000000000001b RCX: 0000000000441609 [ 32.916449] RDX: 0000000000441609 RSI: 0000000000000000 RDI: 0000000000000001 [ 32.923700] RBP: 00000000004a3229 R08: 0000000000000000 R09: 00000000006cd018 [ 32.930944] R10: 0000000000000000 R11: 0000000000000206 R12: 00007ffea47be3d8 [ 32.938188] R13: 0000000000402390 R14: 0000000000000000 R15: 0000000000000000 [ 32.945889] Dumping ftrace buffer: [ 32.949403] (ftrace buffer empty) [ 32.953086] Kernel Offset: disabled [ 32.956690] Rebooting in 86400 seconds..