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 syzkaller login: [ 24.374382] sshd (4459) used greatest stack depth: 17144 bytes left Warning: Permanently added '10.128.10.16' (ECDSA) to the list of known hosts. net.ipv6.conf.syz_tun.accept_dad = 0 net.ipv6.conf.syz_tun.router_solicitations = 0 [ 30.150181] IPVS: ftp: loaded support on port[0] = 21 [ 30.238397] ip (4490) used greatest stack depth: 16584 bytes left RTNETLINK answers: Operation not supported RTNETLINK answers: No buffer space available RTNETLINK answers: Operation not supported [ 30.403795] 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 [ 30.779124] IPv6: ADDRCONF(NETDEV_UP): bond0: link is not ready [ 30.785228] 8021q: adding VLAN 0 to HW filter on device bond0 [ 30.826111] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 30.866119] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 30.907923] IPv6: ADDRCONF(NETDEV_UP): team0: link is not ready [ 30.914046] 8021q: adding VLAN 0 to HW filter on device team0 [ 30.940580] bond0: Enslaving bond_slave as an active interface with an up link [ 30.948879] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready executing program [ 30.965194] team0: Port device team_slave added [ 30.970465] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 31.007284] ================================================================== [ 31.014736] BUG: KASAN: use-after-free in skb_release_data+0x19b/0x860 [ 31.021380] Write of size 4 at addr ffff8801d4701b60 by task syzkaller609870/4474 [ 31.028970] [ 31.030577] CPU: 0 PID: 4474 Comm: syzkaller609870 Not tainted 4.16.0+ #17 [ 31.037562] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.046890] Call Trace: [ 31.049466] dump_stack+0x1b9/0x294 [ 31.053072] ? dump_stack_print_info.cold.2+0x52/0x52 [ 31.058240] ? printk+0x9e/0xba [ 31.061495] ? kmsg_dump_rewind_nolock+0xe4/0xe4 [ 31.066226] ? kasan_check_write+0x14/0x20 [ 31.070436] print_address_description+0x6c/0x20b [ 31.075256] ? skb_release_data+0x19b/0x860 [ 31.079554] kasan_report.cold.7+0xac/0x2f5 [ 31.083852] check_memory_region+0x13e/0x1b0 [ 31.088237] kasan_check_write+0x14/0x20 [ 31.092379] skb_release_data+0x19b/0x860 [ 31.096506] ? skb_tx_error+0x2f0/0x2f0 [ 31.100457] ? kasan_check_read+0x11/0x20 [ 31.104591] ? rcu_is_watching+0x85/0x140 [ 31.108717] ? kasan_check_write+0x14/0x20 [ 31.112929] ? sock_rmem_free+0x6f/0x90 [ 31.116877] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 31.122390] skb_release_all+0x4a/0x60 [ 31.126254] kfree_skb+0x195/0x560 [ 31.129770] ? skb_queue_purge+0x19/0x40 [ 31.133809] ? __kfree_skb+0x20/0x20 [ 31.137498] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 31.142058] ? _raw_spin_unlock_irqrestore+0x74/0xc0 [ 31.147138] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 31.152131] ? trace_hardirqs_on+0xd/0x10 [ 31.156256] ? skb_dequeue+0x12f/0x180 [ 31.160119] skb_queue_purge+0x19/0x40 [ 31.163982] packet_sock_destruct+0x93/0x290 [ 31.168366] ? packet_mm_close+0xc0/0xc0 [ 31.172402] ? graph_lock+0x170/0x170 [ 31.176179] ? __free_object+0x16e/0x330 [ 31.180214] ? __list_del_entry_valid.cold.1+0x58/0x58 [ 31.185465] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 31.190021] ? packet_mm_close+0xc0/0xc0 [ 31.194229] __sk_destruct+0xff/0xa40 [ 31.198008] ? sock_warn_obsolete_bsdism+0xb0/0xb0 [ 31.202919] ? graph_lock+0x170/0x170 [ 31.206698] ? lock_downgrade+0x8e0/0x8e0 [ 31.210822] ? __lock_is_held+0xb5/0x140 [ 31.214858] ? kasan_check_read+0x11/0x20 [ 31.218979] ? do_raw_spin_unlock+0x9e/0x2e0 [ 31.223361] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 31.227920] ? _raw_spin_unlock_irqrestore+0x74/0xc0 [ 31.233000] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.238512] ? refcount_sub_and_test+0x212/0x330 [ 31.243245] ? refcount_inc_not_zero+0x2d0/0x2d0 [ 31.247977] ? refcount_inc_not_zero+0x2d0/0x2d0 [ 31.252708] ? pcpu_free_area+0xa90/0xa90 [ 31.256834] sk_destruct+0x78/0x90 [ 31.260350] __sk_free+0x22e/0x340 [ 31.263867] sk_free+0x42/0x50 [ 31.267036] packet_release+0xa18/0xd50 [ 31.270985] ? lock_downgrade+0x8e0/0x8e0 [ 31.275112] ? packet_lookup_frame+0x270/0x270 [ 31.279669] ? cpumask_weight.constprop.5+0x44/0x44 [ 31.284659] ? do_raw_spin_lock+0xc1/0x200 [ 31.288873] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 31.294388] ? locks_remove_file+0x3f7/0x5a0 [ 31.298780] ? fcntl_setlk+0x1020/0x1020 [ 31.302819] ? fsnotify+0x415/0x1100 [ 31.306515] ? fsnotify_first_mark+0x330/0x330 [ 31.311076] sock_release+0x96/0x1b0 [ 31.314769] ? sock_alloc_file+0x4e0/0x4e0 [ 31.318990] sock_close+0x16/0x20 [ 31.322418] __fput+0x34d/0x890 [ 31.325673] ? fput+0x1a0/0x1a0 [ 31.328932] ? check_same_owner+0x320/0x320 [ 31.333231] ____fput+0x15/0x20 [ 31.336486] task_work_run+0x1e4/0x290 [ 31.340349] ? task_work_cancel+0x240/0x240 [ 31.344650] ? switch_task_namespaces+0xbd/0xd0 [ 31.349298] do_exit+0x1aee/0x2730 [ 31.352815] ? find_held_lock+0x36/0x1c0 [ 31.356854] ? mm_update_next_owner+0x980/0x980 [ 31.361505] ? kasan_check_read+0x11/0x20 [ 31.365636] ? rcu_is_watching+0x85/0x140 [ 31.369761] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 31.374930] ? tun_get+0x22b/0x360 [ 31.378443] ? tun_chr_close+0x60/0x60 [ 31.382309] ? tun_chr_write_iter+0x110/0x154 [ 31.386778] ? fsnotify+0x415/0x1100 [ 31.390477] ? kasan_check_read+0x11/0x20 [ 31.394601] ? rcu_is_watching+0x85/0x140 [ 31.398733] ? rcu_pm_notify+0xc0/0xc0 [ 31.402599] ? vfs_writev+0x255/0x330 [ 31.406372] ? rcu_read_lock_sched_held+0x108/0x120 [ 31.411362] ? kfree+0x1e9/0x260 [ 31.414704] ? vfs_writev+0xfc/0x330 [ 31.418395] ? vfs_iter_write+0xb0/0xb0 [ 31.422353] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 31.427868] ? sockfd_lookup_light+0xc5/0x160 [ 31.432340] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.437852] ? __fdget_pos+0xd6/0x1e0 [ 31.441628] ? __fdget_raw+0x20/0x20 [ 31.445319] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.450835] ? __sys_setsockopt+0x24f/0x390 [ 31.455276] do_group_exit+0x16f/0x430 [ 31.459144] ? SyS_exit+0x30/0x30 [ 31.462584] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 31.467406] ? do_syscall_64+0xb7/0x9d0 [ 31.471357] ? do_group_exit+0x430/0x430 [ 31.475404] SyS_exit_group+0x1d/0x20 [ 31.479192] do_syscall_64+0x29e/0x9d0 [ 31.483059] ? vmalloc_sync_all+0x30/0x30 [ 31.487299] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 31.492038] ? syscall_return_slowpath+0x5c0/0x5c0 [ 31.496948] ? syscall_return_slowpath+0x30f/0x5c0 [ 31.501859] ? entry_SYSCALL_64_after_hwframe+0x52/0xb7 [ 31.507201] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 31.512024] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 31.517189] RIP: 0033:0x441829 [ 31.520365] RSP: 002b:00007ffde28df6f8 EFLAGS: 00000206 ORIG_RAX: 00000000000000e7 [ 31.528071] RAX: ffffffffffffffda RBX: 000000000000001b RCX: 0000000000441829 [ 31.535363] RDX: 0000000000441760 RSI: 0000000000000001 RDI: 0000000000000001 [ 31.542638] RBP: 00000000004a3449 R08: 00000000018ea6b0 R09: 00000000006cd018 [ 31.549911] R10: 0000000000000100 R11: 0000000000000206 R12: 00007ffde28df808 [ 31.557184] R13: 00000000004025b0 R14: 0000000000000000 R15: 0000000000000000 [ 31.564460] [ 31.566082] Allocated by task 4474: [ 31.569708] save_stack+0x43/0xd0 [ 31.573166] kasan_kmalloc+0xc4/0xe0 [ 31.576879] __kmalloc_node_track_caller+0x47/0x70 [ 31.581809] __kmalloc_reserve.isra.38+0x3a/0xe0 [ 31.586564] __alloc_skb+0x14d/0x780 [ 31.590282] alloc_skb_with_frags+0x137/0x760 [ 31.594774] sock_alloc_send_pskb+0x87a/0xae0 [ 31.599273] packet_sendmsg+0x1bd1/0x6100 [ 31.603396] sock_sendmsg+0xd5/0x120 [ 31.607086] ___sys_sendmsg+0x805/0x940 [ 31.611035] __sys_sendmsg+0x115/0x270 [ 31.614897] SyS_sendmsg+0x29/0x30 [ 31.618415] do_syscall_64+0x29e/0x9d0 [ 31.622282] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 31.627473] [ 31.629086] Freed by task 4474: [ 31.632340] save_stack+0x43/0xd0 [ 31.635769] __kasan_slab_free+0x11a/0x170 [ 31.639979] kasan_slab_free+0xe/0x10 [ 31.644549] kfree+0xd9/0x260 [ 31.647632] skb_free_head+0x99/0xc0 [ 31.651319] skb_release_data+0x690/0x860 [ 31.655442] skb_release_all+0x4a/0x60 [ 31.659306] kfree_skb+0x195/0x560 [ 31.662825] ip6_tnl_start_xmit+0xa44/0x2290 [ 31.667210] dev_hard_start_xmit+0x264/0xc10 [ 31.671610] __dev_queue_xmit+0x2724/0x34c0 [ 31.675907] dev_queue_xmit+0x17/0x20 [ 31.679686] packet_sendmsg+0x411d/0x6100 [ 31.684073] sock_sendmsg+0xd5/0x120 [ 31.687764] ___sys_sendmsg+0x805/0x940 [ 31.691714] __sys_sendmsg+0x115/0x270 [ 31.695576] SyS_sendmsg+0x29/0x30 [ 31.699094] do_syscall_64+0x29e/0x9d0 [ 31.702957] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 31.708118] [ 31.709720] The buggy address belongs to the object at ffff8801d4701a80 [ 31.709720] which belongs to the cache kmalloc-512 of size 512 [ 31.722353] The buggy address is located 224 bytes inside of [ 31.722353] 512-byte region [ffff8801d4701a80, ffff8801d4701c80) [ 31.734202] The buggy address belongs to the page: [ 31.739110] page:ffffea000751c040 count:1 mapcount:0 mapping:ffff8801d4701080 index:0x0 [ 31.747235] flags: 0x2fffc0000000100(slab) [ 31.751455] raw: 02fffc0000000100 ffff8801d4701080 0000000000000000 0000000100000006 [ 31.759315] raw: ffffea000751c020 ffffea000751c0a0 ffff8801dac00940 0000000000000000 [ 31.767169] page dumped because: kasan: bad access detected [ 31.772862] [ 31.774465] Memory state around the buggy address: [ 31.779382] ffff8801d4701a00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 31.786856] ffff8801d4701a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 31.794194] >ffff8801d4701b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 31.801534] ^ [ 31.808012] ffff8801d4701b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 31.815346] ffff8801d4701c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 31.822685] ================================================================== [ 31.830190] Disabling lock debugging due to kernel taint [ 31.836059] Kernel panic - not syncing: panic_on_warn set ... [ 31.836059] [ 31.843410] CPU: 0 PID: 4474 Comm: syzkaller609870 Tainted: G B 4.16.0+ #17 [ 31.851700] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.861026] Call Trace: [ 31.863607] dump_stack+0x1b9/0x294 [ 31.867825] ? dump_stack_print_info.cold.2+0x52/0x52 [ 31.872993] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 31.877726] ? skb_release_data+0xd0/0x860 [ 31.881937] panic+0x22f/0x4de [ 31.885105] ? add_taint.cold.5+0x16/0x16 [ 31.889230] ? do_raw_spin_unlock+0x9e/0x2e0 [ 31.893622] ? do_raw_spin_unlock+0x9e/0x2e0 [ 31.898006] ? skb_release_data+0x19b/0x860 [ 31.902304] kasan_end_report+0x47/0x4f [ 31.906256] kasan_report.cold.7+0xc9/0x2f5 [ 31.910564] check_memory_region+0x13e/0x1b0 [ 31.914951] kasan_check_write+0x14/0x20 [ 31.918986] skb_release_data+0x19b/0x860 [ 31.923119] ? skb_tx_error+0x2f0/0x2f0 [ 31.927069] ? kasan_check_read+0x11/0x20 [ 31.931193] ? rcu_is_watching+0x85/0x140 [ 31.935316] ? kasan_check_write+0x14/0x20 [ 31.939540] ? sock_rmem_free+0x6f/0x90 [ 31.943624] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 31.949140] skb_release_all+0x4a/0x60 [ 31.953017] kfree_skb+0x195/0x560 [ 31.956536] ? skb_queue_purge+0x19/0x40 [ 31.960572] ? __kfree_skb+0x20/0x20 [ 31.964262] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 31.968819] ? _raw_spin_unlock_irqrestore+0x74/0xc0 [ 31.973903] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 31.978892] ? trace_hardirqs_on+0xd/0x10 [ 31.983022] ? skb_dequeue+0x12f/0x180 [ 31.986886] skb_queue_purge+0x19/0x40 [ 31.990751] packet_sock_destruct+0x93/0x290 [ 31.995134] ? packet_mm_close+0xc0/0xc0 [ 31.999173] ? graph_lock+0x170/0x170 [ 32.002964] ? __free_object+0x16e/0x330 [ 32.007007] ? __list_del_entry_valid.cold.1+0x58/0x58 [ 32.012267] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 32.016826] ? packet_mm_close+0xc0/0xc0 [ 32.020866] __sk_destruct+0xff/0xa40 [ 32.024654] ? sock_warn_obsolete_bsdism+0xb0/0xb0 [ 32.029560] ? graph_lock+0x170/0x170 [ 32.033337] ? lock_downgrade+0x8e0/0x8e0 [ 32.037460] ? __lock_is_held+0xb5/0x140 [ 32.041510] ? kasan_check_read+0x11/0x20 [ 32.045663] ? do_raw_spin_unlock+0x9e/0x2e0 [ 32.050072] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 32.054660] ? _raw_spin_unlock_irqrestore+0x74/0xc0 [ 32.059777] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.065317] ? refcount_sub_and_test+0x212/0x330 [ 32.070074] ? refcount_inc_not_zero+0x2d0/0x2d0 [ 32.074814] ? refcount_inc_not_zero+0x2d0/0x2d0 [ 32.079550] ? pcpu_free_area+0xa90/0xa90 [ 32.083701] sk_destruct+0x78/0x90 [ 32.087223] __sk_free+0x22e/0x340 [ 32.090739] sk_free+0x42/0x50 [ 32.093918] packet_release+0xa18/0xd50 [ 32.097872] ? lock_downgrade+0x8e0/0x8e0 [ 32.102000] ? packet_lookup_frame+0x270/0x270 [ 32.106566] ? cpumask_weight.constprop.5+0x44/0x44 [ 32.111567] ? do_raw_spin_lock+0xc1/0x200 [ 32.115785] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 32.121301] ? locks_remove_file+0x3f7/0x5a0 [ 32.125686] ? fcntl_setlk+0x1020/0x1020 [ 32.129724] ? fsnotify+0x415/0x1100 [ 32.133419] ? fsnotify_first_mark+0x330/0x330 [ 32.137978] sock_release+0x96/0x1b0 [ 32.141673] ? sock_alloc_file+0x4e0/0x4e0 [ 32.145883] sock_close+0x16/0x20 [ 32.149316] __fput+0x34d/0x890 [ 32.152570] ? fput+0x1a0/0x1a0 [ 32.155828] ? check_same_owner+0x320/0x320 [ 32.160127] ____fput+0x15/0x20 [ 32.163385] task_work_run+0x1e4/0x290 [ 32.167258] ? task_work_cancel+0x240/0x240 [ 32.171579] ? switch_task_namespaces+0xbd/0xd0 [ 32.176225] do_exit+0x1aee/0x2730 [ 32.179741] ? find_held_lock+0x36/0x1c0 [ 32.183779] ? mm_update_next_owner+0x980/0x980 [ 32.188426] ? kasan_check_read+0x11/0x20 [ 32.192549] ? rcu_is_watching+0x85/0x140 [ 32.196673] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 32.201842] ? tun_get+0x22b/0x360 [ 32.205358] ? tun_chr_close+0x60/0x60 [ 32.209233] ? tun_chr_write_iter+0x110/0x154 [ 32.213705] ? fsnotify+0x415/0x1100 [ 32.217397] ? kasan_check_read+0x11/0x20 [ 32.223259] ? rcu_is_watching+0x85/0x140 [ 32.227387] ? rcu_pm_notify+0xc0/0xc0 [ 32.231255] ? vfs_writev+0x255/0x330 [ 32.235038] ? rcu_read_lock_sched_held+0x108/0x120 [ 32.240038] ? kfree+0x1e9/0x260 [ 32.243381] ? vfs_writev+0xfc/0x330 [ 32.247072] ? vfs_iter_write+0xb0/0xb0 [ 32.251033] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 32.256559] ? sockfd_lookup_light+0xc5/0x160 [ 32.261044] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.266571] ? __fdget_pos+0xd6/0x1e0 [ 32.270354] ? __fdget_raw+0x20/0x20 [ 32.274050] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.279563] ? __sys_setsockopt+0x24f/0x390 [ 32.283868] do_group_exit+0x16f/0x430 [ 32.287739] ? SyS_exit+0x30/0x30 [ 32.291170] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 32.295996] ? do_syscall_64+0xb7/0x9d0 [ 32.299960] ? do_group_exit+0x430/0x430 [ 32.303996] SyS_exit_group+0x1d/0x20 [ 32.307786] do_syscall_64+0x29e/0x9d0 [ 32.311651] ? vmalloc_sync_all+0x30/0x30 [ 32.315780] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 32.320514] ? syscall_return_slowpath+0x5c0/0x5c0 [ 32.325426] ? syscall_return_slowpath+0x30f/0x5c0 [ 32.330342] ? entry_SYSCALL_64_after_hwframe+0x52/0xb7 [ 32.335711] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 32.340540] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 32.345706] RIP: 0033:0x441829 [ 32.348869] RSP: 002b:00007ffde28df6f8 EFLAGS: 00000206 ORIG_RAX: 00000000000000e7 [ 32.356560] RAX: ffffffffffffffda RBX: 000000000000001b RCX: 0000000000441829 [ 32.363803] RDX: 0000000000441760 RSI: 0000000000000001 RDI: 0000000000000001 [ 32.371049] RBP: 00000000004a3449 R08: 00000000018ea6b0 R09: 00000000006cd018 [ 32.378296] R10: 0000000000000100 R11: 0000000000000206 R12: 00007ffde28df808 [ 32.385543] R13: 00000000004025b0 R14: 0000000000000000 R15: 0000000000000000 [ 32.393247] Dumping ftrace buffer: [ 32.396784] (ftrace buffer empty) [ 32.400553] Kernel Offset: disabled [ 32.404153] Rebooting in 86400 seconds..