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 'ci-upstream-net-kasan-gce-8,10.128.0.35' (ECDSA) to the list of known hosts. net.ipv6.conf.syz5.accept_dad = 0 net.ipv6.conf.syz0.accept_dad = 0 net.ipv6.conf.syz7.accept_dad = 0 net.ipv6.conf.syz1.accept_dad = 0 net.ipv6.conf.syz2.accept_dad = 0 net.ipv6.conf.syz3.accept_dad = 0 net.ipv6.conf.syz4.accept_dad = 0 net.ipv6.conf.syz6.accept_dad = 0 net.ipv6.conf.syz5.router_solicitations = 0 net.ipv6.conf.syz0.router_solicitations = 0 net.ipv6.conf.syz7.router_solicitations = 0 net.ipv6.conf.syz3.router_solicitations = 0 net.ipv6.conf.syz1.router_solicitations = 0 net.ipv6.conf.syz2.router_solicitations = 0 net.ipv6.conf.syz6.router_solicitations = 0 net.ipv6.conf.syz4.router_solicitations = 0 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program syzkaller login: [ 52.685609] dev_remove_pack: ffff8801cc419180 not found executing program [ 52.756550] ================================================================== [ 52.764001] BUG: KASAN: use-after-free in dev_queue_xmit_nit+0xa0c/0xae0 [ 52.770832] Read of size 8 at addr ffff8801cb068c20 by task sshd/2983 [ 52.777402] [ 52.779026] CPU: 1 PID: 2983 Comm: sshd Not tainted 4.13.0+ #43 [ 52.785072] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 52.794414] Call Trace: [ 52.797000] dump_stack+0x194/0x257 [ 52.800632] ? arch_local_irq_restore+0x53/0x53 [ 52.805297] ? show_regs_print_info+0x65/0x65 [ 52.809803] ? compat_packet_setsockopt+0x140/0x140 [ 52.814819] ? dev_queue_xmit_nit+0xa0c/0xae0 [ 52.819309] print_address_description+0x73/0x250 [ 52.824139] ? dev_queue_xmit_nit+0xa0c/0xae0 [ 52.828611] kasan_report+0x24e/0x340 [ 52.832391] __asan_report_load8_noabort+0x14/0x20 [ 52.837306] dev_queue_xmit_nit+0xa0c/0xae0 [ 52.841614] ? __packet_pick_tx_queue+0x70/0x70 [ 52.846263] ? netif_device_attach+0x150/0x150 [ 52.850820] ? find_held_lock+0x39/0x1d0 [ 52.854874] ? reacquire_held_locks+0x205/0x3d0 [ 52.859523] ? dev_queue_xmit+0x17/0x20 [ 52.863477] dev_hard_start_xmit+0x16b/0xac0 [ 52.867868] ? validate_xmit_skb_list+0x120/0x120 [ 52.872681] ? netif_skb_features+0x573/0x8e0 [ 52.877166] ? lock_set_class+0x700/0x780 [ 52.881298] ? __skb_gso_segment+0x7f0/0x7f0 [ 52.885684] ? lock_acquire+0x1d5/0x580 [ 52.889629] ? sch_direct_xmit+0x280/0x6d0 [ 52.893844] ? skb_csum_hwoffload_help+0x57/0xa0 [ 52.898587] ? lock_release+0xd70/0xd70 [ 52.902546] ? netif_skb_features+0x8e0/0x8e0 [ 52.907061] sch_direct_xmit+0x31d/0x6d0 [ 52.911108] ? dev_deactivate_queue.constprop.27+0x260/0x260 [ 52.916905] __dev_queue_xmit+0x15fe/0x1e40 [ 52.921234] ? netdev_pick_tx+0x300/0x300 [ 52.925367] ? print_usage_bug+0x480/0x480 [ 52.929599] ? selinux_ipv4_forward+0x50/0x50 [ 52.934069] ? lock_acquire+0x1d5/0x580 [ 52.938024] ? ip_finish_output+0x85e/0xd10 [ 52.942352] ? mark_held_locks+0xb2/0x100 [ 52.946474] ? ip_finish_output2+0xca6/0x1460 [ 52.950958] dev_queue_xmit+0x17/0x20 [ 52.954742] ip_finish_output2+0xece/0x1460 [ 52.959054] ? dst_output+0x140/0x140 [ 52.962830] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 52.967820] ? ipt_do_table+0xd04/0x1330 [ 52.971861] ? trace_hardirqs_on+0xd/0x10 [ 52.975992] ? find_held_lock+0x39/0x1d0 [ 52.980041] ? ipv4_mtu+0x28c/0x3d0 [ 52.983656] ? __lock_is_held+0xbc/0x140 [ 52.987703] ip_finish_output+0x85e/0xd10 [ 52.991823] ? ip_finish_output+0x85e/0xd10 [ 52.996132] ? ip_fragment.constprop.50+0x200/0x200 [ 53.001128] ? iptable_mangle_hook+0xa9/0x550 [ 53.005604] ? nf_hook_slow+0xd3/0x1a0 [ 53.009469] ip_output+0x1cc/0x860 [ 53.012984] ? ip_mc_output+0x1350/0x1350 [ 53.017116] ? ip_fragment.constprop.50+0x200/0x200 [ 53.022119] ip_local_out+0x95/0x160 [ 53.025807] ip_queue_xmit+0x8c6/0x18e0 [ 53.029768] ? ip_build_and_send_pkt+0xc30/0xc30 [ 53.034508] ? refcount_dec_if_one+0x20/0x20 [ 53.038896] ? __tcp_v4_send_check+0x1b8/0x350 [ 53.043449] ? tcp_options_write+0x228/0x940 [ 53.047839] tcp_transmit_skb+0x1947/0x3300 [ 53.052144] ? bictcp_cong_avoid+0xf20/0xf20 [ 53.056524] ? __tcp_select_window+0x8d0/0x8d0 [ 53.061079] ? save_stack_trace+0x16/0x20 [ 53.065200] ? save_stack+0x43/0xd0 [ 53.068799] ? kasan_kmalloc+0xad/0xe0 [ 53.072656] ? __kmalloc_node_track_caller+0x47/0x70 [ 53.077730] ? __kmalloc_reserve.isra.40+0x41/0xd0 [ 53.082637] ? __alloc_skb+0x13b/0x740 [ 53.086502] ? sk_stream_alloc_skb+0x10d/0x860 [ 53.091055] ? tcp_sendmsg_locked+0xfef/0x3bc0 [ 53.095609] ? tcp_sendmsg+0x2f/0x50 [ 53.099306] ? inet_sendmsg+0x11f/0x5e0 [ 53.103258] ? sock_sendmsg+0xca/0x110 [ 53.107118] ? sock_write_iter+0x320/0x5e0 [ 53.111330] ? __vfs_write+0x68a/0x970 [ 53.115211] ? tcp_init_tso_segs+0x1f0/0x1f0 [ 53.119601] ? sched_clock_cpu+0x1b/0x170 [ 53.123720] ? tcp_init_tso_segs+0x114/0x1f0 [ 53.128106] tcp_write_xmit+0x5fc/0x4960 [ 53.132156] ? find_held_lock+0x39/0x1d0 [ 53.136211] ? tcp_transmit_skb+0x3300/0x3300 [ 53.140683] ? __might_fault+0xe0/0x1d0 [ 53.144632] ? iov_iter_advance+0x2a1/0x13f0 [ 53.149031] ? lock_release+0xd70/0xd70 [ 53.152996] ? tcp_v4_md5_lookup+0x22/0x30 [ 53.157218] ? iov_iter_copy_from_user_atomic+0xd30/0xd30 [ 53.162732] __tcp_push_pending_frames+0xa0/0x250 [ 53.167557] tcp_push+0x4e0/0x760 [ 53.170991] ? tcp_splice_data_recv+0x1a0/0x1a0 [ 53.175643] ? skb_entail+0x5d4/0x8d0 [ 53.179428] ? iov_iter_advance+0x13f0/0x13f0 [ 53.183904] ? tcp_send_mss+0xa4/0x2f0 [ 53.187762] ? skb_put+0x149/0x1c0 [ 53.191282] tcp_sendmsg_locked+0x17ad/0x3bc0 [ 53.195760] ? check_noncircular+0x20/0x20 [ 53.199976] ? save_stack_trace+0x16/0x20 [ 53.204120] ? tcp_sendpage+0x60/0x60 [ 53.207919] ? lock_downgrade+0x990/0x990 [ 53.212056] ? lock_acquire+0x1d5/0x580 [ 53.216010] ? tcp_sendmsg+0x21/0x50 [ 53.219720] ? mark_held_locks+0xb2/0x100 [ 53.223843] ? __local_bh_enable_ip+0x9d/0x160 [ 53.228399] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 53.233390] ? lock_sock_nested+0x91/0x110 [ 53.237601] ? trace_hardirqs_on+0xd/0x10 [ 53.241722] ? __local_bh_enable_ip+0x9d/0x160 [ 53.246287] tcp_sendmsg+0x2f/0x50 [ 53.249805] inet_sendmsg+0x11f/0x5e0 [ 53.253595] ? inet_recvmsg+0x5f0/0x5f0 [ 53.257558] ? selinux_socket_sendmsg+0x36/0x40 [ 53.262206] ? security_socket_sendmsg+0x89/0xb0 [ 53.266937] ? inet_recvmsg+0x5f0/0x5f0 [ 53.270887] sock_sendmsg+0xca/0x110 [ 53.274575] sock_write_iter+0x320/0x5e0 [ 53.278612] ? sock_sendmsg+0x110/0x110 [ 53.282587] ? iov_iter_init+0xaf/0x1d0 [ 53.286544] __vfs_write+0x68a/0x970 [ 53.290242] ? default_llseek+0x2a0/0x2a0 [ 53.294360] ? selinux_capset+0x100/0x100 [ 53.298508] ? selinux_file_permission+0x82/0x460 [ 53.303349] ? rw_verify_area+0xe5/0x2b0 [ 53.307389] ? __fdget_raw+0x20/0x20 [ 53.311095] vfs_write+0x18f/0x510 [ 53.314623] SyS_write+0xef/0x220 [ 53.318055] ? SyS_read+0x220/0x220 [ 53.321653] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 53.326643] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 53.331392] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 53.336133] RIP: 0033:0x7fe9a9ab4370 [ 53.339821] RSP: 002b:00007ffede8a76b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 53.347511] RAX: ffffffffffffffda RBX: 0000000000000038 RCX: 00007fe9a9ab4370 [ 53.354752] RDX: 0000000000000038 RSI: 000055f6a4564440 RDI: 0000000000000003 [ 53.362011] RBP: 0000000000000082 R08: 0000000000000001 R09: 0101010101010101 [ 53.369260] R10: 0000000000000008 R11: 0000000000000246 R12: 00007ffede8a771c [ 53.376512] R13: 000055f6a4458fb4 R14: 0000000000000028 R15: 000055f6a445aca0 [ 53.383794] [ 53.385402] Allocated by task 11343: [ 53.389089] save_stack_trace+0x16/0x20 [ 53.393039] save_stack+0x43/0xd0 [ 53.396466] kasan_kmalloc+0xad/0xe0 [ 53.400153] kmem_cache_alloc_trace+0x136/0x750 [ 53.404794] fanout_add+0xa50/0x1190 [ 53.408480] packet_setsockopt+0xfdc/0x1e80 [ 53.412780] SyS_setsockopt+0x189/0x360 [ 53.416728] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 53.421451] [ 53.423054] Freed by task 11321: [ 53.426403] save_stack_trace+0x16/0x20 [ 53.430369] save_stack+0x43/0xd0 [ 53.433792] kasan_slab_free+0x71/0xc0 [ 53.437650] kfree+0xca/0x250 [ 53.440727] packet_release+0xa8f/0xd70 [ 53.444673] sock_release+0x8d/0x1e0 [ 53.448358] sock_close+0x16/0x20 [ 53.451791] __fput+0x333/0x7f0 [ 53.455042] ____fput+0x15/0x20 [ 53.458294] task_work_run+0x199/0x270 [ 53.462151] do_exit+0xa52/0x1b40 [ 53.465572] do_group_exit+0x149/0x400 [ 53.469436] SyS_exit_group+0x1d/0x20 [ 53.473214] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 53.477941] [ 53.479545] The buggy address belongs to the object at ffff8801cb068380 [ 53.479545] which belongs to the cache kmalloc-4096 of size 4096 [ 53.492351] The buggy address is located 2208 bytes inside of [ 53.492351] 4096-byte region [ffff8801cb068380, ffff8801cb069380) [ 53.504380] The buggy address belongs to the page: [ 53.509287] page:ffffea00072c1a00 count:1 mapcount:0 mapping:ffff8801cb068380 index:0x0 compound_mapcount: 0 [ 53.519234] flags: 0x200000000008100(slab|head) [ 53.523884] raw: 0200000000008100 ffff8801cb068380 0000000000000000 0000000100000001 [ 53.531746] raw: ffffea00072c09a0 ffffea00072e9420 ffff8801dac00dc0 0000000000000000 [ 53.539597] page dumped because: kasan: bad access detected [ 53.545275] [ 53.546874] Memory state around the buggy address: [ 53.551776] ffff8801cb068b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 53.559114] ffff8801cb068b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 53.566455] >ffff8801cb068c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 53.573799] ^ [ 53.578178] ffff8801cb068c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 53.585510] ffff8801cb068d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 53.592845] ================================================================== [ 53.600174] Disabling lock debugging due to kernel taint [ 53.605655] Kernel panic - not syncing: panic_on_warn set ... [ 53.605655] [ 53.612992] CPU: 1 PID: 2983 Comm: sshd Tainted: G B 4.13.0+ #43 [ 53.620240] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 53.629568] Call Trace: [ 53.632126] dump_stack+0x194/0x257 [ 53.635720] ? arch_local_irq_restore+0x53/0x53 [ 53.640362] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 53.645098] ? dev_queue_xmit_nit+0x9e0/0xae0 [ 53.649559] panic+0x1e4/0x417 [ 53.652717] ? __warn+0x1d9/0x1d9 [ 53.656151] ? dev_queue_xmit_nit+0xa0c/0xae0 [ 53.660616] kasan_end_report+0x50/0x50 [ 53.664558] kasan_report+0x137/0x340 [ 53.668329] __asan_report_load8_noabort+0x14/0x20 [ 53.673227] dev_queue_xmit_nit+0xa0c/0xae0 [ 53.677517] ? __packet_pick_tx_queue+0x70/0x70 [ 53.682153] ? netif_device_attach+0x150/0x150 [ 53.686712] ? find_held_lock+0x39/0x1d0 [ 53.690752] ? reacquire_held_locks+0x205/0x3d0 [ 53.695396] ? dev_queue_xmit+0x17/0x20 [ 53.699338] dev_hard_start_xmit+0x16b/0xac0 [ 53.703719] ? validate_xmit_skb_list+0x120/0x120 [ 53.708527] ? netif_skb_features+0x573/0x8e0 [ 53.712990] ? lock_set_class+0x700/0x780 [ 53.717105] ? __skb_gso_segment+0x7f0/0x7f0 [ 53.721483] ? lock_acquire+0x1d5/0x580 [ 53.725424] ? sch_direct_xmit+0x280/0x6d0 [ 53.729635] ? skb_csum_hwoffload_help+0x57/0xa0 [ 53.734360] ? lock_release+0xd70/0xd70 [ 53.738304] ? netif_skb_features+0x8e0/0x8e0 [ 53.742775] sch_direct_xmit+0x31d/0x6d0 [ 53.746817] ? dev_deactivate_queue.constprop.27+0x260/0x260 [ 53.752588] __dev_queue_xmit+0x15fe/0x1e40 [ 53.756880] ? netdev_pick_tx+0x300/0x300