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-9,10.128.15.192' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program 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: [ 35.558387] dev_remove_pack: ffff8801c8654940 not found executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 36.120499] ================================================================== [ 36.127961] BUG: KASAN: use-after-free in fanout_demux_rollover+0x49b/0x4d0 [ 36.135064] Read of size 8 at addr ffff8801c86548f0 by task sshd/2976 [ 36.141650] [ 36.143269] CPU: 0 PID: 2976 Comm: sshd Not tainted 4.13.0+ #42 [ 36.149321] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 36.158672] Call Trace: [ 36.161254] dump_stack+0x194/0x257 [ 36.164869] ? arch_local_irq_restore+0x53/0x53 [ 36.169550] ? show_regs_print_info+0x65/0x65 [ 36.174042] ? skb_split+0x1310/0x1310 [ 36.177935] ? run_filter+0x21c/0x360 [ 36.181729] ? lock_acquire+0x1d5/0x580 [ 36.185698] ? fanout_demux_rollover+0x49b/0x4d0 [ 36.190445] print_address_description+0x73/0x250 [ 36.195279] ? fanout_demux_rollover+0x49b/0x4d0 [ 36.200036] kasan_report+0x24e/0x340 [ 36.203839] __asan_report_load8_noabort+0x14/0x20 [ 36.208766] fanout_demux_rollover+0x49b/0x4d0 [ 36.213351] ? run_filter+0x360/0x360 [ 36.217141] packet_rcv_fanout+0x52e/0x7d0 [ 36.221355] ? compat_packet_setsockopt+0x140/0x140 [ 36.226426] ? __lock_is_held+0xbc/0x140 [ 36.230485] ? refcount_add+0x60/0x60 [ 36.234283] ? check_noncircular+0x20/0x20 [ 36.238508] dev_queue_xmit_nit+0x2d4/0xae0 [ 36.242817] ? netif_device_attach+0x150/0x150 [ 36.247385] ? find_held_lock+0x39/0x1d0 [ 36.251439] ? reacquire_held_locks+0x205/0x3d0 [ 36.256088] ? dev_queue_xmit+0x17/0x20 [ 36.260056] dev_hard_start_xmit+0x16b/0xac0 [ 36.264476] ? validate_xmit_skb_list+0x120/0x120 [ 36.270520] ? netif_skb_features+0x573/0x8e0 [ 36.274995] ? register_lock_class+0x1b60/0x2c70 [ 36.279731] ? __skb_gso_segment+0x7f0/0x7f0 [ 36.284126] ? lock_acquire+0x1d5/0x580 [ 36.288080] ? sch_direct_xmit+0x280/0x6d0 [ 36.293166] ? skb_csum_hwoffload_help+0x57/0xa0 [ 36.297921] ? lock_release+0xd70/0xd70 [ 36.301910] ? netif_skb_features+0x8e0/0x8e0 [ 36.306408] sch_direct_xmit+0x31d/0x6d0 [ 36.310470] ? dev_deactivate_queue.constprop.27+0x260/0x260 [ 36.316256] __dev_queue_xmit+0x15fe/0x1e40 [ 36.320564] ? netdev_pick_tx+0x300/0x300 [ 36.324692] ? print_usage_bug+0x480/0x480 [ 36.328945] ? selinux_ipv4_forward+0x50/0x50 [ 36.333433] ? lock_acquire+0x1d5/0x580 [ 36.337395] ? ip_finish_output+0x85e/0xd10 [ 36.341713] ? mark_held_locks+0xb2/0x100 [ 36.345857] ? ip_finish_output2+0xca6/0x1460 [ 36.350342] dev_queue_xmit+0x17/0x20 [ 36.354123] ip_finish_output2+0xece/0x1460 [ 36.358452] ? dst_output+0x140/0x140 [ 36.362250] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 36.367258] ? ipt_do_table+0xd04/0x1330 [ 36.371302] ? trace_hardirqs_on+0xd/0x10 [ 36.375447] ? find_held_lock+0x39/0x1d0 [ 36.379510] ? ipv4_mtu+0x28c/0x3d0 [ 36.383145] ? __lock_is_held+0xbc/0x140 [ 36.387223] ip_finish_output+0x85e/0xd10 [ 36.391357] ? ip_finish_output+0x85e/0xd10 [ 36.395661] ? ip_fragment.constprop.50+0x200/0x200 [ 36.400673] ? iptable_mangle_hook+0xa9/0x550 [ 36.405171] ? nf_hook_slow+0xd3/0x1a0 [ 36.409059] ip_output+0x1cc/0x860 [ 36.412592] ? ip_mc_output+0x1350/0x1350 [ 36.416737] ? ip_fragment.constprop.50+0x200/0x200 [ 36.421740] ip_local_out+0x95/0x160 [ 36.425443] ip_queue_xmit+0x8c6/0x18e0 [ 36.429416] ? ip_build_and_send_pkt+0xc30/0xc30 [ 36.434154] ? refcount_dec_if_one+0x20/0x20 [ 36.438547] ? __tcp_v4_send_check+0x1b8/0x350 [ 36.443101] ? tcp_options_write+0x228/0x940 [ 36.447492] tcp_transmit_skb+0x1947/0x3300 [ 36.451797] ? bictcp_cong_avoid+0xf20/0xf20 [ 36.456183] ? __tcp_select_window+0x8d0/0x8d0 [ 36.460740] ? save_stack_trace+0x16/0x20 [ 36.464867] ? save_stack+0x43/0xd0 [ 36.468468] ? kasan_kmalloc+0xad/0xe0 [ 36.472330] ? __kmalloc_node_track_caller+0x47/0x70 [ 36.477413] ? __kmalloc_reserve.isra.40+0x41/0xd0 [ 36.482327] ? __alloc_skb+0x13b/0x740 [ 36.486190] ? sk_stream_alloc_skb+0x10d/0x860 [ 36.490746] ? tcp_sendmsg_locked+0xfef/0x3bc0 [ 36.495303] ? tcp_sendmsg+0x2f/0x50 [ 36.498993] ? inet_sendmsg+0x11f/0x5e0 [ 36.502950] ? sock_sendmsg+0xca/0x110 [ 36.506815] ? sock_write_iter+0x320/0x5e0 [ 36.511036] ? __vfs_write+0x68a/0x970 [ 36.514923] ? tcp_init_tso_segs+0x1f0/0x1f0 [ 36.519332] ? sched_clock_cpu+0x1b/0x170 [ 36.523462] ? tcp_init_tso_segs+0x114/0x1f0 [ 36.527848] tcp_write_xmit+0x5fc/0x4960 [ 36.531889] ? find_held_lock+0x39/0x1d0 [ 36.535962] ? tcp_transmit_skb+0x3300/0x3300 [ 36.540470] ? __might_fault+0xe0/0x1d0 [ 36.544422] ? iov_iter_advance+0x2a1/0x13f0 [ 36.548811] ? lock_release+0xd70/0xd70 [ 36.552764] ? tcp_v4_md5_lookup+0x22/0x30 [ 36.556985] ? iov_iter_copy_from_user_atomic+0xd30/0xd30 [ 36.562508] __tcp_push_pending_frames+0xa0/0x250 [ 36.567330] tcp_push+0x4e0/0x760 [ 36.570765] ? tcp_splice_data_recv+0x1a0/0x1a0 [ 36.575410] ? skb_entail+0x5d4/0x8d0 [ 36.579189] ? iov_iter_advance+0x13f0/0x13f0 [ 36.583676] ? tcp_send_mss+0xa4/0x2f0 [ 36.587545] ? skb_put+0x149/0x1c0 [ 36.591074] tcp_sendmsg_locked+0x17ad/0x3bc0 [ 36.595556] ? check_noncircular+0x20/0x20 [ 36.599781] ? save_stack_trace+0x16/0x20 [ 36.603924] ? tcp_sendpage+0x60/0x60 [ 36.607711] ? lock_downgrade+0x990/0x990 [ 36.611853] ? lock_acquire+0x1d5/0x580 [ 36.615814] ? tcp_sendmsg+0x21/0x50 [ 36.619523] ? mark_held_locks+0xb2/0x100 [ 36.623653] ? __local_bh_enable_ip+0x9d/0x160 [ 36.628231] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 36.633231] ? lock_sock_nested+0x91/0x110 [ 36.637447] ? trace_hardirqs_on+0xd/0x10 [ 36.641583] ? __local_bh_enable_ip+0x9d/0x160 [ 36.646151] tcp_sendmsg+0x2f/0x50 [ 36.649672] inet_sendmsg+0x11f/0x5e0 [ 36.653451] ? inet_recvmsg+0x5f0/0x5f0 [ 36.657402] ? selinux_socket_sendmsg+0x36/0x40 [ 36.662057] ? security_socket_sendmsg+0x89/0xb0 [ 36.666790] ? inet_recvmsg+0x5f0/0x5f0 [ 36.670742] sock_sendmsg+0xca/0x110 [ 36.674431] sock_write_iter+0x320/0x5e0 [ 36.678472] ? sock_sendmsg+0x110/0x110 [ 36.682437] ? iov_iter_init+0xaf/0x1d0 [ 36.686405] __vfs_write+0x68a/0x970 [ 36.690100] ? default_llseek+0x2a0/0x2a0 [ 36.694233] ? selinux_capset+0x100/0x100 [ 36.698377] ? selinux_file_permission+0x82/0x460 [ 36.703219] ? rw_verify_area+0xe5/0x2b0 [ 36.707258] ? __fdget_raw+0x20/0x20 [ 36.710951] vfs_write+0x18f/0x510 [ 36.714472] SyS_write+0xef/0x220 [ 36.717925] ? SyS_read+0x220/0x220 [ 36.721543] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 36.726547] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 36.731289] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 36.736024] RIP: 0033:0x7f2f8985e370 [ 36.739716] RSP: 002b:00007fff948308e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 36.747403] RAX: ffffffffffffffda RBX: 0000000000000038 RCX: 00007f2f8985e370 [ 36.754653] RDX: 0000000000000038 RSI: 000055e56987f440 RDI: 0000000000000003 [ 36.761899] RBP: 0000000000000082 R08: 0000000000000001 R09: 0101010101010101 [ 36.769145] R10: 0000000000000008 R11: 0000000000000246 R12: 000055e56987db60 [ 36.776397] R13: 000055e567da2fb4 R14: 0000000000000028 R15: 000055e567da4ca0 [ 36.783670] [ 36.785277] Allocated by task 6217: [ 36.788882] save_stack_trace+0x16/0x20 [ 36.792838] save_stack+0x43/0xd0 [ 36.796273] kasan_kmalloc+0xad/0xe0 [ 36.799968] __kmalloc+0x162/0x760 [ 36.803491] sk_prot_alloc+0x101/0x2a0 [ 36.807377] sk_alloc+0x89/0x700 [ 36.810720] packet_create+0x169/0xb00 [ 36.814580] __sock_create+0x4d4/0x850 [ 36.818441] SyS_socket+0xeb/0x200 [ 36.821960] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 36.826695] [ 36.828297] Freed by task 6147: [ 36.831551] save_stack_trace+0x16/0x20 [ 36.835500] save_stack+0x43/0xd0 [ 36.839021] kasan_slab_free+0x71/0xc0 [ 36.842888] kfree+0xca/0x250 [ 36.846054] __sk_destruct+0x74a/0x910 [ 36.849915] sk_destruct+0x47/0x80 [ 36.853429] __sk_free+0x57/0x230 [ 36.856871] sk_free+0x2a/0x40 [ 36.860044] packet_release+0x859/0xd70 [ 36.863998] sock_release+0x8d/0x1e0 [ 36.867698] sock_close+0x16/0x20 [ 36.871133] __fput+0x333/0x7f0 [ 36.874393] ____fput+0x15/0x20 [ 36.877654] task_work_run+0x199/0x270 [ 36.881531] do_exit+0xa52/0x1b40 [ 36.884958] do_group_exit+0x149/0x400 [ 36.888825] SyS_exit_group+0x1d/0x20 [ 36.892604] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 36.897333] [ 36.898954] The buggy address belongs to the object at ffff8801c8654180 [ 36.898954] which belongs to the cache kmalloc-2048 of size 2048 [ 36.911765] The buggy address is located 1904 bytes inside of [ 36.911765] 2048-byte region [ffff8801c8654180, ffff8801c8654980) [ 36.923791] The buggy address belongs to the page: [ 36.928711] page:ffffea0007219500 count:1 mapcount:0 mapping:ffff8801c8654180 index:0x0 compound_mapcount: 0 [ 36.938667] flags: 0x200000000008100(slab|head) [ 36.943313] raw: 0200000000008100 ffff8801c8654180 0000000000000000 0000000100000003 [ 36.951177] raw: ffffea000724da20 ffffea00072a3f20 ffff8801dac00c40 0000000000000000 [ 36.959123] page dumped because: kasan: bad access detected [ 36.964904] [ 36.966506] Memory state around the buggy address: [ 36.971410] ffff8801c8654780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 36.978746] ffff8801c8654800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 36.986084] >ffff8801c8654880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 36.993427] ^ [ 37.000415] ffff8801c8654900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 37.007751] ffff8801c8654980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 37.015089] ================================================================== [ 37.022429] Disabling lock debugging due to kernel taint [ 37.027902] Kernel panic - not syncing: panic_on_warn set ... [ 37.027902] [ 37.035245] CPU: 0 PID: 2976 Comm: sshd Tainted: G B 4.13.0+ #42 [ 37.042497] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 37.051834] Call Trace: [ 37.054402] dump_stack+0x194/0x257 [ 37.058014] ? arch_local_irq_restore+0x53/0x53 [ 37.062686] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 37.067430] ? fanout_demux_rollover+0x480/0x4d0 [ 37.072171] panic+0x1e4/0x417 [ 37.075390] ? __warn+0x1d9/0x1d9 [ 37.078832] ? fanout_demux_rollover+0x49b/0x4d0 [ 37.083563] kasan_end_report+0x50/0x50 [ 37.087514] kasan_report+0x137/0x340 [ 37.091296] __asan_report_load8_noabort+0x14/0x20 [ 37.096199] fanout_demux_rollover+0x49b/0x4d0 [ 37.100756] ? run_filter+0x360/0x360 [ 37.104533] packet_rcv_fanout+0x52e/0x7d0 [ 37.108741] ? compat_packet_setsockopt+0x140/0x140 [ 37.113742] ? __lock_is_held+0xbc/0x140 [ 37.117775] ? refcount_add+0x60/0x60