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 RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: File exists syzkaller login: [ 31.933614] ip (3598) used greatest stack depth: 54672 bytes left RTNETLINK answers: Operation not supported [ 32.030555] ip (3611) used greatest stack depth: 54560 bytes left RTNETLINK answers: Operation not supported Cannot find device "vcan0" Cannot find device "vcan0" [ 32.190593] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready Cannot find device "vcan0" Cannot find device "vcan0" Cannot find device "tunl0" Cannot find device "tunl0" Cannot find device "tunl0" Cannot find device "tunl0" Cannot find device "gre0" Cannot find device "gre0" Cannot find device "gre0" Cannot find device "gre0" Cannot find device "gretap0" Cannot find device "gretap0" Cannot find device "gretap0" Cannot find device "gretap0" Cannot find device "ip_vti0" Cannot find device "ip_vti0" Cannot find device "ip_vti0" Cannot find device "ip_vti0" Cannot find device "ip6_vti0" Cannot find device "ip6_vti0" Cannot find device "ip6_vti0" Cannot find device "ip6_vti0" Cannot find device "ip6tnl0" Cannot find device "ip6tnl0" Cannot find device "ip6tnl0" Cannot find device "ip6tnl0" Cannot find device "ip6gre0" Cannot find device "ip6gre0" Cannot find device "ip6gre0" Cannot find device "ip6gre0" Cannot find device "ip6gretap0" Cannot find device "ip6gretap0" Cannot find device "ip6gretap0" Cannot find device "ip6gretap0" Cannot find device "erspan0" Cannot find device "erspan0" Cannot find device "erspan0" Cannot find device "erspan0" Cannot find device "bond0" Cannot find device "bond0" Cannot find device "bond0" Cannot find device "bond0" [ 33.354343] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready Cannot find device "team0" [ 33.412875] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready [ 33.419128] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready [ 33.426347] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready Cannot find device "team0" Cannot find device "team0" Cannot find device "team0" executing program [ 33.570522] ================================================================== [ 33.577916] BUG: KMSAN: uninit-value in iptable_mangle_hook+0x5e5/0x720 [ 33.584649] CPU: 0 PID: 3850 Comm: syzkaller734285 Not tainted 4.16.0+ #82 [ 33.591635] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.600968] Call Trace: [ 33.603536] dump_stack+0x185/0x1d0 [ 33.607142] ? iptable_mangle_hook+0x5e5/0x720 [ 33.611703] kmsan_report+0x142/0x240 [ 33.615481] __msan_warning_32+0x6c/0xb0 [ 33.619517] iptable_mangle_hook+0x5e5/0x720 [ 33.623903] ? iptable_mangle_net_exit+0x130/0x130 [ 33.628812] nf_hook_slow+0x158/0x3d0 [ 33.632603] ip_queue_xmit+0x1d21/0x21c0 [ 33.636642] ? __ip_local_out+0x5b0/0x5b0 [ 33.640769] ? skb_checksum+0xec/0x120 [ 33.644633] ? skb_checksum+0x120/0x120 [ 33.648587] ? csum_partial_ext+0xa0/0xa0 [ 33.652713] ? ip_output+0x5c0/0x5c0 [ 33.656405] dccp_transmit_skb+0x15eb/0x1900 [ 33.660795] dccp_xmit_packet+0x814/0x9e0 [ 33.664921] dccp_write_xmit+0x20f/0x480 [ 33.668961] dccp_sendmsg+0x12ca/0x12d0 [ 33.672914] ? compat_dccp_getsockopt+0x190/0x190 [ 33.677733] inet_sendmsg+0x48d/0x740 [ 33.681515] ? security_socket_sendmsg+0x9e/0x210 [ 33.686349] ? inet_getname+0x500/0x500 [ 33.690312] ___sys_sendmsg+0xec0/0x1310 [ 33.694360] ? do_huge_pmd_anonymous_page+0x19d5/0x2520 [ 33.699702] ? __fdget+0x4e/0x60 [ 33.703059] ? __fget_light+0x56/0x710 [ 33.706931] ? __fdget+0x4e/0x60 [ 33.710299] ? __fget_light+0x1dc/0x710 [ 33.714275] ? __msan_metadata_ptr_for_load_4+0x10/0x20 [ 33.719615] ? __fget_light+0x1f5/0x710 [ 33.723579] SYSC_sendmsg+0x2a3/0x3d0 [ 33.727361] SyS_sendmsg+0x54/0x80 [ 33.730879] do_syscall_64+0x309/0x430 [ 33.734746] ? ___sys_sendmsg+0x1310/0x1310 [ 33.739056] entry_SYSCALL_64_after_hwframe+0x3d/0xa2 [ 33.744225] RIP: 0033:0x442749 [ 33.747394] RSP: 002b:00007ffe4f3ffe28 EFLAGS: 00000217 ORIG_RAX: 000000000000002e [ 33.755079] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000442749 [ 33.762323] RDX: 0000000000000000 RSI: 0000000020b76fc8 RDI: 0000000000000005 [ 33.769580] RBP: 0000000000000000 R08: 0000000000000078 R09: 0000000000000078 [ 33.776827] R10: 0000000000000078 R11: 0000000000000217 R12: 00007ffe4f3ffef8 [ 33.784077] R13: 00000000006cf448 R14: 0000000000000000 R15: 0000000000000000 [ 33.791331] [ 33.792940] Uninit was stored to memory at: [ 33.797240] kmsan_internal_chain_origin+0x12b/0x210 [ 33.802317] __msan_chain_origin+0x69/0xc0 [ 33.806528] ip_queue_xmit+0x1e35/0x21c0 [ 33.810581] dccp_transmit_skb+0x15eb/0x1900 [ 33.814964] dccp_xmit_packet+0x814/0x9e0 [ 33.819090] dccp_write_xmit+0x20f/0x480 [ 33.823125] dccp_sendmsg+0x12ca/0x12d0 [ 33.827076] inet_sendmsg+0x48d/0x740 [ 33.830854] ___sys_sendmsg+0xec0/0x1310 [ 33.834889] SYSC_sendmsg+0x2a3/0x3d0 [ 33.838667] SyS_sendmsg+0x54/0x80 [ 33.842183] do_syscall_64+0x309/0x430 [ 33.846053] entry_SYSCALL_64_after_hwframe+0x3d/0xa2 [ 33.851222] Uninit was stored to memory at: [ 33.855524] kmsan_internal_chain_origin+0x12b/0x210 [ 33.860606] __msan_chain_origin+0x69/0xc0 [ 33.864819] inet_csk_clone_lock+0x503/0x580 [ 33.869214] dccp_create_openreq_child+0x7f/0x890 [ 33.874051] dccp_v4_request_recv_sock+0x22c/0xe90 [ 33.878959] dccp_v6_request_recv_sock+0x290/0x2000 [ 33.883954] dccp_check_req+0x7b9/0x8f0 [ 33.887921] dccp_v4_rcv+0x12e4/0x2630 [ 33.891786] ip_local_deliver_finish+0x6ed/0xd40 [ 33.896517] ip_local_deliver+0x43c/0x4e0 [ 33.900639] ip_rcv_finish+0x1253/0x16d0 [ 33.904673] ip_rcv+0x119d/0x16f0 [ 33.908105] __netif_receive_skb_core+0x47cf/0x4a80 [ 33.913103] process_backlog+0x62d/0xe20 [ 33.917138] net_rx_action+0x7c1/0x1a70 [ 33.921088] __do_softirq+0x56d/0x93d [ 33.924859] Uninit was created at: [ 33.928376] kmsan_internal_poison_shadow+0xb8/0x1b0 [ 33.933454] kmsan_kmalloc+0x94/0x100 [ 33.937230] kmem_cache_alloc+0xaab/0xb90 [ 33.941356] inet_reqsk_alloc+0xc4/0x7f0 [ 33.945401] dccp_v4_conn_request+0x5cc/0x1770 [ 33.949957] dccp_v6_conn_request+0x299/0x1880 [ 33.954522] dccp_rcv_state_process+0x2ea/0x2410 [ 33.959258] dccp_v4_do_rcv+0x229/0x340 [ 33.963215] dccp_v6_do_rcv+0x16d/0x1220 [ 33.967249] __sk_receive_skb+0x60e/0xf20 [ 33.971371] dccp_v4_rcv+0x24d4/0x2630 [ 33.975233] ip_local_deliver_finish+0x6ed/0xd40 [ 33.979977] ip_local_deliver+0x43c/0x4e0 [ 33.984105] ip_rcv_finish+0x1253/0x16d0 [ 33.988152] ip_rcv+0x119d/0x16f0 [ 33.991590] __netif_receive_skb_core+0x47cf/0x4a80 [ 33.996584] process_backlog+0x62d/0xe20 [ 34.000618] net_rx_action+0x7c1/0x1a70 [ 34.004958] __do_softirq+0x56d/0x93d [ 34.008732] ================================================================== [ 34.016068] Disabling lock debugging due to kernel taint [ 34.021505] Kernel panic - not syncing: panic_on_warn set ... [ 34.021505] [ 34.028849] CPU: 0 PID: 3850 Comm: syzkaller734285 Tainted: G B 4.16.0+ #82 [ 34.037143] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 34.046471] Call Trace: [ 34.049050] dump_stack+0x185/0x1d0 [ 34.052662] panic+0x39d/0x940 [ 34.055842] ? iptable_mangle_hook+0x5e5/0x720 [ 34.060409] kmsan_report+0x238/0x240 [ 34.064188] __msan_warning_32+0x6c/0xb0 [ 34.068228] iptable_mangle_hook+0x5e5/0x720 [ 34.072614] ? iptable_mangle_net_exit+0x130/0x130 [ 34.077528] nf_hook_slow+0x158/0x3d0 [ 34.081305] ip_queue_xmit+0x1d21/0x21c0 [ 34.085344] ? __ip_local_out+0x5b0/0x5b0 [ 34.089466] ? skb_checksum+0xec/0x120 [ 34.093331] ? skb_checksum+0x120/0x120 [ 34.097280] ? csum_partial_ext+0xa0/0xa0 [ 34.101418] ? ip_output+0x5c0/0x5c0 [ 34.105122] dccp_transmit_skb+0x15eb/0x1900 [ 34.109511] dccp_xmit_packet+0x814/0x9e0 [ 34.113651] dccp_write_xmit+0x20f/0x480 [ 34.117697] dccp_sendmsg+0x12ca/0x12d0 [ 34.121651] ? compat_dccp_getsockopt+0x190/0x190 [ 34.126468] inet_sendmsg+0x48d/0x740 [ 34.130252] ? security_socket_sendmsg+0x9e/0x210 [ 34.135091] ? inet_getname+0x500/0x500 [ 34.139053] ___sys_sendmsg+0xec0/0x1310 [ 34.143093] ? do_huge_pmd_anonymous_page+0x19d5/0x2520 [ 34.148435] ? __fdget+0x4e/0x60 [ 34.151785] ? __fget_light+0x56/0x710 [ 34.155647] ? __fdget+0x4e/0x60 [ 34.158990] ? __fget_light+0x1dc/0x710 [ 34.162945] ? __msan_metadata_ptr_for_load_4+0x10/0x20 [ 34.168292] ? __fget_light+0x1f5/0x710 [ 34.172250] SYSC_sendmsg+0x2a3/0x3d0 [ 34.176043] SyS_sendmsg+0x54/0x80 [ 34.179579] do_syscall_64+0x309/0x430 [ 34.183449] ? ___sys_sendmsg+0x1310/0x1310 [ 34.187753] entry_SYSCALL_64_after_hwframe+0x3d/0xa2 [ 34.192921] RIP: 0033:0x442749 [ 34.196106] RSP: 002b:00007ffe4f3ffe28 EFLAGS: 00000217 ORIG_RAX: 000000000000002e [ 34.203796] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000442749 [ 34.211049] RDX: 0000000000000000 RSI: 0000000020b76fc8 RDI: 0000000000000005 [ 34.218299] RBP: 0000000000000000 R08: 0000000000000078 R09: 0000000000000078 [ 34.225546] R10: 0000000000000078 R11: 0000000000000217 R12: 00007ffe4f3ffef8 [ 34.232791] R13: 00000000006cf448 R14: 0000000000000000 R15: 0000000000000000 [ 34.240463] Dumping ftrace buffer: [ 34.243977] (ftrace buffer empty) [ 34.247657] Kernel Offset: disabled [ 34.251256] Rebooting in 86400 seconds..