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 '10.128.0.31' (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: [ 24.099140] IPVS: ftp: loaded support on port[0] = 21 RTNETLINK answers: File exists RTNETLINK answers: Operation not supported RTNETLINK answers: No buffer space available RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported [ 24.327716] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Invalid argument RTNETLINK answers: Invalid argument RTNETLINK answers: Invalid argument [ 24.643246] IPv6: ADDRCONF(NETDEV_UP): bond0: link is not ready [ 24.649345] 8021q: adding VLAN 0 to HW filter on device bond0 executing program [ 24.683707] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 24.719394] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready executing program executing program executing program executing program [ 24.733804] protocol 0000 is buggy, dev ip6tnl0 [ 24.741147] protocol 0000 is buggy, dev ip6tnl0 [ 24.749449] protocol 0000 is buggy, dev ip6tnl0 [ 24.758354] protocol 0000 is buggy, dev ip6tnl0 [ 24.768270] protocol 0000 is buggy, dev ip6tnl0 [ 24.779043] protocol 0000 is buggy, dev ip6tnl0 executing program executing program executing program executing program executing program executing program executing program executing program [ 24.787968] protocol 0000 is buggy, dev ip6tnl0 [ 24.796552] protocol 0000 is buggy, dev ip6tnl0 [ 24.806131] protocol 0000 is buggy, dev ip6tnl0 [ 24.814657] protocol 0000 is buggy, dev ip6tnl0 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 29.028828] ================================================================== [ 29.036284] BUG: KASAN: use-after-free in copyout+0x7d/0xb0 [ 29.041967] Read of size 14 at addr ffff8801d472a8d0 by task syzkaller790446/4590 [ 29.049555] [ 29.051159] CPU: 0 PID: 4590 Comm: syzkaller790446 Not tainted 4.16.0-rc7+ #9 [ 29.058404] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.067831] Call Trace: [ 29.070392] dump_stack+0x194/0x24d [ 29.074002] ? arch_local_irq_restore+0x53/0x53 executing program executing program executing program [ 29.078666] ? show_regs_print_info+0x18/0x18 [ 29.083161] ? __might_fault+0x110/0x1d0 [ 29.087200] ? lock_downgrade+0x980/0x980 [ 29.091321] ? copyout+0x7d/0xb0 [ 29.094663] print_address_description+0x73/0x250 [ 29.099481] ? copyout+0x7d/0xb0 [ 29.102825] kasan_report+0x23c/0x360 [ 29.106612] check_memory_region+0x137/0x190 [ 29.111007] kasan_check_read+0x11/0x20 [ 29.114974] copyout+0x7d/0xb0 [ 29.118152] _copy_to_iter+0x262/0x13a0 [ 29.122106] ? __skb_try_recv_from_queue+0x980/0x980 [ 29.127200] ? check_stack_object+0x68/0x140 [ 29.131595] ? iov_iter_fault_in_readable+0x420/0x420 [ 29.136774] ? usercopy_abort+0xd0/0xd0 [ 29.140744] ? rcu_pm_notify+0xc0/0xc0 [ 29.144633] skb_copy_datagram_iter+0x1c2/0xac0 [ 29.149292] ? futex_wake+0x680/0x680 [ 29.153083] ? skb_recv_datagram+0xe3/0x130 [ 29.157391] ? __sk_queue_drop_skb+0x1d0/0x1d0 [ 29.161970] ? futex_wait_setup+0x3d0/0x3d0 [ 29.166278] ? print_irqtrace_events+0x270/0x270 [ 29.171027] packet_recvmsg+0x2b9/0x17a0 [ 29.175079] ? packet_getname_spkt+0x2b0/0x2b0 [ 29.179646] ? trace_hardirqs_off+0x10/0x10 [ 29.183957] ? get_futex_key+0x1d50/0x1d50 [ 29.188179] ? __lock_acquire+0x664/0x3e00 [ 29.192408] ? find_held_lock+0x35/0x1d0 [ 29.196463] ? security_socket_recvmsg+0x91/0xc0 [ 29.201209] ? packet_getname_spkt+0x2b0/0x2b0 [ 29.205779] sock_recvmsg+0xc9/0x110 [ 29.209484] sock_read_iter+0x35b/0x560 [ 29.213447] ? sock_recvmsg+0x110/0x110 [ 29.217405] ? check_same_owner+0x320/0x320 [ 29.221726] do_iter_readv_writev+0x630/0x830 [ 29.226212] ? vfs_dedupe_file_range+0x8f0/0x8f0 [ 29.230964] ? rw_verify_area+0xe5/0x2b0 [ 29.235015] do_iter_read+0x21a/0x5a0 [ 29.238804] ? dup_iter+0x260/0x260 [ 29.242427] vfs_readv+0x121/0x1c0 [ 29.245960] ? compat_rw_copy_check_uvector+0x2f0/0x2f0 [ 29.251311] ? __close_fd+0x20b/0x360 [ 29.255108] ? lock_downgrade+0x980/0x980 [ 29.259249] ? fput+0xd2/0x140 [ 29.262435] ? __fdget_pos+0x130/0x190 [ 29.266310] ? __fdget_raw+0x20/0x20 [ 29.270021] do_readv+0xfc/0x2a0 [ 29.273370] ? do_readv+0xfc/0x2a0 [ 29.276902] ? vfs_readv+0x1c0/0x1c0 [ 29.280606] ? security_file_ioctl+0x89/0xb0 [ 29.285004] SyS_readv+0x27/0x30 [ 29.288358] ? do_preadv+0x1a0/0x1a0 [ 29.292063] do_syscall_64+0x281/0x940 [ 29.295940] ? _raw_spin_unlock_irq+0x27/0x70 [ 29.300422] ? finish_task_switch+0x1c1/0x7e0 [ 29.304905] ? syscall_return_slowpath+0x550/0x550 [ 29.309824] ? syscall_return_slowpath+0x2ac/0x550 [ 29.314739] ? prepare_exit_to_usermode+0x350/0x350 [ 29.319742] ? entry_SYSCALL_64_after_hwframe+0x52/0xb7 [ 29.325099] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 29.329937] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 29.335112] RIP: 0033:0x446d89 [ 29.338285] RSP: 002b:00007f2bcd5b1d48 EFLAGS: 00000293 ORIG_RAX: 0000000000000013 [ 29.345983] RAX: ffffffffffffffda RBX: 00000000006dcc8c RCX: 0000000000446d89 [ 29.353241] RDX: 0000000000000001 RSI: 0000000020000100 RDI: 00000000000003fe [ 29.360501] RBP: 00000000006dcc88 R08: 00000000200001c0 R09: 00000000200001c0 [ 29.367756] R10: 00000000200001c0 R11: 0000000000000293 R12: 6475612f7665642f [ 29.375010] R13: 440aa2dc38fb8f86 R14: 00007f2bcd5b29c0 R15: 0000000000000008 [ 29.382275] [ 29.383891] Allocated by task 4588: [ 29.387510] save_stack+0x43/0xd0 [ 29.391039] kasan_kmalloc+0xad/0xe0 [ 29.394741] __kmalloc_node_track_caller+0x47/0x70 [ 29.399657] __kmalloc_reserve.isra.39+0x41/0xd0 [ 29.404401] __alloc_skb+0x13b/0x780 [ 29.408101] alloc_skb_with_frags+0x10d/0x750 [ 29.412582] sock_alloc_send_pskb+0x787/0x9b0 [ 29.417064] packet_sendmsg+0x1ece/0x60b0 [ 29.421196] sock_sendmsg+0xca/0x110 [ 29.424893] SYSC_sendto+0x361/0x5c0 [ 29.428590] SyS_sendto+0x40/0x50 [ 29.432029] do_syscall_64+0x281/0x940 [ 29.435902] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 29.441074] [ 29.442689] Freed by task 4588: [ 29.445958] save_stack+0x43/0xd0 [ 29.449396] __kasan_slab_free+0x11a/0x170 [ 29.453618] kasan_slab_free+0xe/0x10 [ 29.457409] kfree+0xd9/0x260 [ 29.460500] skb_free_head+0x74/0xb0 [ 29.464198] skb_release_data+0x58c/0x790 [ 29.468330] skb_release_all+0x4a/0x60 [ 29.472199] kfree_skb+0x15d/0x4c0 [ 29.475727] ip6_tnl_start_xmit+0x184/0x2070 [ 29.480121] dev_hard_start_xmit+0x24e/0xac0 [ 29.484519] __dev_queue_xmit+0x26bf/0x2fc0 [ 29.488828] dev_queue_xmit+0x17/0x20 [ 29.492612] packet_sendmsg+0x3aed/0x60b0 [ 29.496741] sock_sendmsg+0xca/0x110 [ 29.500440] SYSC_sendto+0x361/0x5c0 [ 29.504136] SyS_sendto+0x40/0x50 [ 29.507585] do_syscall_64+0x281/0x940 [ 29.511459] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 29.516636] [ 29.518253] The buggy address belongs to the object at ffff8801d472a840 [ 29.518253] which belongs to the cache kmalloc-512 of size 512 [ 29.530895] The buggy address is located 144 bytes inside of [ 29.530895] 512-byte region [ffff8801d472a840, ffff8801d472aa40) [ 29.542752] The buggy address belongs to the page: [ 29.547673] page:ffffea000751ca80 count:1 mapcount:0 mapping:ffff8801d472a0c0 index:0x0 [ 29.555810] flags: 0x2fffc0000000100(slab) [ 29.560037] raw: 02fffc0000000100 ffff8801d472a0c0 0000000000000000 0000000100000006 [ 29.567907] raw: ffffea000751c9e0 ffffea000751cb20 ffff8801dac00940 0000000000000000 [ 29.575770] page dumped because: kasan: bad access detected [ 29.581464] [ 29.583074] Memory state around the buggy address: [ 29.587991] ffff8801d472a780: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc [ 29.595333] ffff8801d472a800: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb [ 29.602676] >ffff8801d472a880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 29.610019] ^ [ 29.615977] ffff8801d472a900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 29.623320] ffff8801d472a980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 29.630672] ================================================================== [ 29.638012] Disabling lock debugging due to kernel taint [ 29.643983] Kernel panic - not syncing: panic_on_warn set ... [ 29.643983] [ 29.651351] CPU: 0 PID: 4590 Comm: syzkaller790446 Tainted: G B 4.16.0-rc7+ #9 [ 29.659911] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.669251] Call Trace: [ 29.671824] dump_stack+0x194/0x24d [ 29.675437] ? arch_local_irq_restore+0x53/0x53 [ 29.680091] ? kasan_end_report+0x32/0x50 [ 29.684232] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 29.688966] ? vsnprintf+0x1ed/0x1900 [ 29.692743] ? copyout+0x60/0xb0 [ 29.696085] panic+0x1e4/0x41c [ 29.699249] ? refcount_error_report+0x214/0x214 [ 29.703978] ? add_taint+0x1c/0x50 [ 29.707517] ? add_taint+0x1c/0x50 [ 29.711050] ? copyout+0x7d/0xb0 [ 29.714403] kasan_end_report+0x50/0x50 [ 29.718349] kasan_report+0x149/0x360 [ 29.722123] check_memory_region+0x137/0x190 [ 29.726506] kasan_check_read+0x11/0x20 [ 29.730458] copyout+0x7d/0xb0 [ 29.733629] _copy_to_iter+0x262/0x13a0 [ 29.738027] ? __skb_try_recv_from_queue+0x980/0x980 [ 29.743105] ? check_stack_object+0x68/0x140 [ 29.747485] ? iov_iter_fault_in_readable+0x420/0x420 [ 29.752655] ? usercopy_abort+0xd0/0xd0 [ 29.756615] ? rcu_pm_notify+0xc0/0xc0 [ 29.760487] skb_copy_datagram_iter+0x1c2/0xac0 [ 29.765158] ? futex_wake+0x680/0x680 [ 29.768957] ? skb_recv_datagram+0xe3/0x130 [ 29.773266] ? __sk_queue_drop_skb+0x1d0/0x1d0 [ 29.777839] ? futex_wait_setup+0x3d0/0x3d0 [ 29.782142] ? print_irqtrace_events+0x270/0x270 [ 29.786886] packet_recvmsg+0x2b9/0x17a0 [ 29.790946] ? packet_getname_spkt+0x2b0/0x2b0 [ 29.795500] ? trace_hardirqs_off+0x10/0x10 [ 29.799802] ? get_futex_key+0x1d50/0x1d50 [ 29.804013] ? __lock_acquire+0x664/0x3e00 [ 29.808244] ? find_held_lock+0x35/0x1d0 [ 29.812283] ? security_socket_recvmsg+0x91/0xc0 [ 29.817025] ? packet_getname_spkt+0x2b0/0x2b0 [ 29.821587] sock_recvmsg+0xc9/0x110 [ 29.825273] sock_read_iter+0x35b/0x560 [ 29.829219] ? sock_recvmsg+0x110/0x110 [ 29.833165] ? check_same_owner+0x320/0x320 [ 29.837467] do_iter_readv_writev+0x630/0x830 [ 29.841934] ? vfs_dedupe_file_range+0x8f0/0x8f0 [ 29.846664] ? rw_verify_area+0xe5/0x2b0 [ 29.850701] do_iter_read+0x21a/0x5a0 [ 29.854482] ? dup_iter+0x260/0x260 [ 29.858085] vfs_readv+0x121/0x1c0 [ 29.861614] ? compat_rw_copy_check_uvector+0x2f0/0x2f0 [ 29.866950] ? __close_fd+0x20b/0x360 [ 29.870731] ? lock_downgrade+0x980/0x980 [ 29.874853] ? fput+0xd2/0x140 [ 29.878020] ? __fdget_pos+0x130/0x190 [ 29.881876] ? __fdget_raw+0x20/0x20 [ 29.885564] do_readv+0xfc/0x2a0 [ 29.888899] ? do_readv+0xfc/0x2a0 [ 29.892931] ? vfs_readv+0x1c0/0x1c0 [ 29.896617] ? security_file_ioctl+0x89/0xb0 [ 29.900998] SyS_readv+0x27/0x30 [ 29.904345] ? do_preadv+0x1a0/0x1a0 [ 29.908039] do_syscall_64+0x281/0x940 [ 29.911900] ? _raw_spin_unlock_irq+0x27/0x70 [ 29.916369] ? finish_task_switch+0x1c1/0x7e0 [ 29.920836] ? syscall_return_slowpath+0x550/0x550 [ 29.925737] ? syscall_return_slowpath+0x2ac/0x550 [ 29.930639] ? prepare_exit_to_usermode+0x350/0x350 [ 29.935628] ? entry_SYSCALL_64_after_hwframe+0x52/0xb7 [ 29.940965] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 29.945784] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 29.950948] RIP: 0033:0x446d89 [ 29.954108] RSP: 002b:00007f2bcd5b1d48 EFLAGS: 00000293 ORIG_RAX: 0000000000000013 [ 29.961787] RAX: ffffffffffffffda RBX: 00000000006dcc8c RCX: 0000000000446d89 [ 29.969031] RDX: 0000000000000001 RSI: 0000000020000100 RDI: 00000000000003fe [ 29.976273] RBP: 00000000006dcc88 R08: 00000000200001c0 R09: 00000000200001c0 [ 29.983515] R10: 00000000200001c0 R11: 0000000000000293 R12: 6475612f7665642f [ 29.990763] R13: 440aa2dc38fb8f86 R14: 00007f2bcd5b29c0 R15: 0000000000000008 [ 29.998468] Dumping ftrace buffer: [ 30.001983] (ftrace buffer empty) [ 30.005669] Kernel Offset: disabled [ 30.009272] Rebooting in 86400 seconds..