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 '10.128.10.40' (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 syzkaller login: [ 43.365337] ================================================================== [ 43.372872] BUG: KMSAN: uninit-value in iptable_mangle_hook+0x5e5/0x720 [ 43.379611] CPU: 0 PID: 3656 Comm: syzkaller005515 Not tainted 4.16.0+ #84 [ 43.386601] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 43.395953] Call Trace: [ 43.398524] [ 43.400658] dump_stack+0x185/0x1d0 [ 43.404285] ? iptable_mangle_hook+0x5e5/0x720 [ 43.408862] kmsan_report+0x142/0x240 [ 43.412640] __msan_warning_32+0x6c/0xb0 [ 43.416693] iptable_mangle_hook+0x5e5/0x720 [ 43.421090] ? iptable_mangle_net_exit+0x130/0x130 [ 43.426011] nf_hook_slow+0x158/0x3d0 [ 43.429817] ip_queue_xmit+0x1d21/0x21c0 [ 43.433859] ? __ip_local_out+0x5b0/0x5b0 [ 43.438016] ? skb_checksum+0xec/0x120 [ 43.441890] ? skb_checksum+0x120/0x120 [ 43.445877] ? csum_partial_ext+0xa0/0xa0 [ 43.450038] ? ip_output+0x5c0/0x5c0 [ 43.453739] dccp_transmit_skb+0x15eb/0x1900 [ 43.458135] dccp_send_ack+0x2de/0x560 [ 43.462012] ccid2_hc_rx_packet_recv+0x229/0x270 [ 43.466749] ? ccid2_hc_tx_exit+0x1e0/0x1e0 [ 43.471065] dccp_rcv_established+0x3d9/0x620 [ 43.475588] dccp_v4_do_rcv+0x19a/0x340 [ 43.480559] ? dccp_v4_send_response+0x610/0x610 [ 43.485328] __sk_receive_skb+0x60e/0xf20 [ 43.489494] dccp_v4_rcv+0x24d4/0x2630 [ 43.493372] ? local_bh_enable+0x40/0x40 [ 43.497439] ip_local_deliver_finish+0x6ed/0xd40 [ 43.502200] ip_local_deliver+0x43c/0x4e0 [ 43.506350] ? ip_local_deliver+0x4e0/0x4e0 [ 43.510674] ? ip_call_ra_chain+0x7b0/0x7b0 [ 43.514995] ip_rcv_finish+0x1253/0x16d0 [ 43.519067] ip_rcv+0x119d/0x16f0 [ 43.522527] ? ip_rcv+0x16f0/0x16f0 [ 43.526198] __netif_receive_skb_core+0x47cf/0x4a80 [ 43.531212] ? rb_insert_color+0x1122/0x1300 [ 43.535635] ? kmsan_internal_memset_shadow_inline+0xc0/0xd0 [ 43.541435] ? ip_local_deliver_finish+0xd40/0xd40 [ 43.546357] process_backlog+0x62d/0xe20 [ 43.550418] ? rps_trigger_softirq+0x2f0/0x2f0 [ 43.555011] net_rx_action+0x7c1/0x1a70 [ 43.559002] ? net_tx_action+0xab0/0xab0 executing program executing program executing program executing program executing program [ 43.563061] __do_softirq+0x56d/0x93d [ 43.566841] do_softirq_own_stack+0x2a/0x40 [ 43.571227] [ 43.573455] __local_bh_enable_ip+0x114/0x140 [ 43.577937] local_bh_enable+0x36/0x40 [ 43.582265] ip_finish_output2+0x124e/0x1380 [ 43.586680] ip_finish_output+0xcb0/0xff0 [ 43.590812] ip_output+0x502/0x5c0 [ 43.594352] ? ip_mc_finish_output+0x3b0/0x3b0 [ 43.598973] ? ip_finish_output+0xff0/0xff0 [ 43.603311] ip_queue_xmit+0x1fae/0x21c0 [ 43.607355] ? __ip_local_out+0x5b0/0x5b0 [ 43.611496] ? skb_checksum+0xec/0x120 [ 43.615377] ? skb_checksum+0x120/0x120 [ 43.619359] ? csum_partial_ext+0xa0/0xa0 [ 43.623532] ? ip_output+0x5c0/0x5c0 [ 43.627256] dccp_transmit_skb+0x15eb/0x1900 [ 43.631659] dccp_xmit_packet+0x814/0x9e0 [ 43.635794] dccp_write_xmit+0x20f/0x480 [ 43.639837] dccp_sendmsg+0x12ca/0x12d0 [ 43.643809] ? compat_dccp_getsockopt+0x190/0x190 [ 43.648643] inet_sendmsg+0x48d/0x740 [ 43.652424] ? security_socket_sendmsg+0x9e/0x210 [ 43.657249] ? inet_getname+0x500/0x500 [ 43.661213] ___sys_sendmsg+0xec0/0x1310 [ 43.665269] ? __fdget+0x4e/0x60 [ 43.668623] __sys_sendmmsg+0x42d/0x800 [ 43.672592] ? __msan_poison_alloca+0x15c/0x1d0 [ 43.677253] ? syscall_return_slowpath+0xe9/0x700 [ 43.682222] ? prepare_exit_to_usermode+0x4a/0x3a0 [ 43.687146] SYSC_sendmmsg+0xc4/0x110 [ 43.690941] SyS_sendmmsg+0x63/0x90 [ 43.694550] do_syscall_64+0x309/0x430 [ 43.698417] ? __sys_sendmmsg+0x800/0x800 [ 43.702556] entry_SYSCALL_64_after_hwframe+0x3d/0xa2 [ 43.707735] RIP: 0033:0x44a499 [ 43.710903] RSP: 002b:00007f9d147aada8 EFLAGS: 00000287 ORIG_RAX: 0000000000000133 [ 43.718600] RAX: ffffffffffffffda RBX: 00000000006dbd14 RCX: 000000000044a499 [ 43.725946] RDX: 0000000000000001 RSI: 0000000020001b00 RDI: 000000000000002a [ 43.733208] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 [ 43.740477] R10: 0000000000000000 R11: 0000000000000287 R12: 00000000006dbd10 [ 43.747765] R13: 70756f7267632f2e R14: 632e746573757063 R15: 0000000000000023 [ 43.755021] [ 43.756633] Uninit was stored to memory at: [ 43.760963] kmsan_internal_chain_origin+0x12b/0x210 [ 43.766219] __msan_chain_origin+0x69/0xc0 [ 43.770473] ip_queue_xmit+0x1e35/0x21c0 [ 43.774551] dccp_transmit_skb+0x15eb/0x1900 [ 43.779066] dccp_send_ack+0x2de/0x560 [ 43.782960] ccid2_hc_rx_packet_recv+0x229/0x270 [ 43.787729] dccp_rcv_established+0x3d9/0x620 [ 43.792233] dccp_v4_do_rcv+0x19a/0x340 [ 43.796215] __sk_receive_skb+0x60e/0xf20 [ 43.800367] dccp_v4_rcv+0x24d4/0x2630 [ 43.804262] ip_local_deliver_finish+0x6ed/0xd40 [ 43.809029] ip_local_deliver+0x43c/0x4e0 [ 43.813184] ip_rcv_finish+0x1253/0x16d0 [ 43.817231] ip_rcv+0x119d/0x16f0 [ 43.820682] __netif_receive_skb_core+0x47cf/0x4a80 [ 43.825695] process_backlog+0x62d/0xe20 [ 43.829742] net_rx_action+0x7c1/0x1a70 [ 43.833713] __do_softirq+0x56d/0x93d [ 43.837496] Uninit was stored to memory at: [ 43.841805] kmsan_internal_chain_origin+0x12b/0x210 [ 43.846884] __msan_chain_origin+0x69/0xc0 [ 43.851101] inet_csk_clone_lock+0x503/0x580 [ 43.855502] dccp_create_openreq_child+0x7f/0x890 [ 43.860337] dccp_v4_request_recv_sock+0x22c/0xe90 [ 43.865261] dccp_v6_request_recv_sock+0x290/0x2000 [ 43.870257] dccp_check_req+0x7b9/0x8f0 [ 43.874207] dccp_v4_rcv+0x12e4/0x2630 [ 43.878072] ip_local_deliver_finish+0x6ed/0xd40 [ 43.882809] ip_local_deliver+0x43c/0x4e0 [ 43.887032] ip_rcv_finish+0x1253/0x16d0 [ 43.891083] ip_rcv+0x119d/0x16f0 [ 43.894518] __netif_receive_skb_core+0x47cf/0x4a80 [ 43.899510] process_backlog+0x62d/0xe20 [ 43.903549] net_rx_action+0x7c1/0x1a70 [ 43.907505] __do_softirq+0x56d/0x93d [ 43.911279] Uninit was created at: [ 43.914817] kmsan_internal_poison_shadow+0xb8/0x1b0 [ 43.919924] kmsan_kmalloc+0x94/0x100 [ 43.923720] kmem_cache_alloc+0xaab/0xb90 [ 43.927865] inet_reqsk_alloc+0xc4/0x7f0 [ 43.931921] dccp_v4_conn_request+0x5cc/0x1770 [ 43.936489] dccp_v6_conn_request+0x299/0x1880 [ 43.941061] dccp_rcv_state_process+0x2ea/0x2410 [ 43.945799] dccp_v4_do_rcv+0x229/0x340 [ 43.949753] dccp_v6_do_rcv+0x16d/0x1220 [ 43.953793] __sk_receive_skb+0x60e/0xf20 [ 43.957918] dccp_v4_rcv+0x24d4/0x2630 [ 43.961797] ip_local_deliver_finish+0x6ed/0xd40 [ 43.966531] ip_local_deliver+0x43c/0x4e0 [ 43.970663] ip_rcv_finish+0x1253/0x16d0 [ 43.974708] ip_rcv+0x119d/0x16f0 [ 43.978167] __netif_receive_skb_core+0x47cf/0x4a80 [ 43.983705] process_backlog+0x62d/0xe20 [ 43.987757] net_rx_action+0x7c1/0x1a70 [ 43.991727] __do_softirq+0x56d/0x93d [ 43.995520] ================================================================== [ 44.002873] Disabling lock debugging due to kernel taint [ 44.008305] Kernel panic - not syncing: panic_on_warn set ... [ 44.008305] [ 44.015662] CPU: 0 PID: 3656 Comm: syzkaller005515 Tainted: G B 4.16.0+ #84 [ 44.023974] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 44.033316] Call Trace: [ 44.035881] [ 44.038037] dump_stack+0x185/0x1d0 [ 44.041651] panic+0x39d/0x940 [ 44.044831] ? iptable_mangle_hook+0x5e5/0x720 [ 44.049411] kmsan_report+0x238/0x240 [ 44.053213] __msan_warning_32+0x6c/0xb0 [ 44.057276] iptable_mangle_hook+0x5e5/0x720 [ 44.061678] ? iptable_mangle_net_exit+0x130/0x130 [ 44.066691] nf_hook_slow+0x158/0x3d0 [ 44.070492] ip_queue_xmit+0x1d21/0x21c0 [ 44.074539] ? __ip_local_out+0x5b0/0x5b0 [ 44.078675] ? skb_checksum+0xec/0x120 [ 44.082545] ? skb_checksum+0x120/0x120 [ 44.086503] ? csum_partial_ext+0xa0/0xa0 [ 44.091433] ? ip_output+0x5c0/0x5c0 [ 44.095144] dccp_transmit_skb+0x15eb/0x1900 [ 44.099539] dccp_send_ack+0x2de/0x560 [ 44.103409] ccid2_hc_rx_packet_recv+0x229/0x270 [ 44.108170] ? ccid2_hc_tx_exit+0x1e0/0x1e0 [ 44.112573] dccp_rcv_established+0x3d9/0x620 [ 44.117138] dccp_v4_do_rcv+0x19a/0x340 [ 44.121101] ? dccp_v4_send_response+0x610/0x610 [ 44.125839] __sk_receive_skb+0x60e/0xf20 [ 44.129988] dccp_v4_rcv+0x24d4/0x2630 [ 44.133860] ? local_bh_enable+0x40/0x40 [ 44.137902] ip_local_deliver_finish+0x6ed/0xd40 [ 44.142652] ip_local_deliver+0x43c/0x4e0 [ 44.146785] ? ip_local_deliver+0x4e0/0x4e0 [ 44.151104] ? ip_call_ra_chain+0x7b0/0x7b0 [ 44.155406] ip_rcv_finish+0x1253/0x16d0 [ 44.159462] ip_rcv+0x119d/0x16f0 [ 44.162905] ? ip_rcv+0x16f0/0x16f0 [ 44.166519] __netif_receive_skb_core+0x47cf/0x4a80 [ 44.171515] ? rb_insert_color+0x1122/0x1300 [ 44.175907] ? kmsan_internal_memset_shadow_inline+0xc0/0xd0 [ 44.181686] ? ip_local_deliver_finish+0xd40/0xd40 [ 44.186605] process_backlog+0x62d/0xe20 [ 44.190750] ? rps_trigger_softirq+0x2f0/0x2f0 [ 44.195320] net_rx_action+0x7c1/0x1a70 [ 44.199274] ? net_tx_action+0xab0/0xab0 [ 44.203314] __do_softirq+0x56d/0x93d [ 44.207095] do_softirq_own_stack+0x2a/0x40 [ 44.211391] [ 44.213607] __local_bh_enable_ip+0x114/0x140 [ 44.218095] local_bh_enable+0x36/0x40 [ 44.221978] ip_finish_output2+0x124e/0x1380 [ 44.226370] ip_finish_output+0xcb0/0xff0 [ 44.230501] ip_output+0x502/0x5c0 [ 44.234020] ? ip_mc_finish_output+0x3b0/0x3b0 [ 44.239775] ? ip_finish_output+0xff0/0xff0 [ 44.244529] ip_queue_xmit+0x1fae/0x21c0 [ 44.248576] ? __ip_local_out+0x5b0/0x5b0 [ 44.252717] ? skb_checksum+0xec/0x120 [ 44.256579] ? skb_checksum+0x120/0x120 [ 44.260530] ? csum_partial_ext+0xa0/0xa0 [ 44.264659] ? ip_output+0x5c0/0x5c0 [ 44.268352] dccp_transmit_skb+0x15eb/0x1900 [ 44.272741] dccp_xmit_packet+0x814/0x9e0 [ 44.276883] dccp_write_xmit+0x20f/0x480 [ 44.280927] dccp_sendmsg+0x12ca/0x12d0 [ 44.284903] ? compat_dccp_getsockopt+0x190/0x190 [ 44.289731] inet_sendmsg+0x48d/0x740 [ 44.293544] ? security_socket_sendmsg+0x9e/0x210 [ 44.298362] ? inet_getname+0x500/0x500 [ 44.302312] ___sys_sendmsg+0xec0/0x1310 [ 44.306353] ? __fdget+0x4e/0x60 [ 44.309700] __sys_sendmmsg+0x42d/0x800 [ 44.313666] ? __msan_poison_alloca+0x15c/0x1d0 [ 44.318316] ? syscall_return_slowpath+0xe9/0x700 [ 44.323134] ? prepare_exit_to_usermode+0x4a/0x3a0 [ 44.328051] SYSC_sendmmsg+0xc4/0x110 [ 44.331828] SyS_sendmmsg+0x63/0x90 [ 44.335430] do_syscall_64+0x309/0x430 [ 44.339302] ? __sys_sendmmsg+0x800/0x800 [ 44.343426] entry_SYSCALL_64_after_hwframe+0x3d/0xa2 [ 44.348603] RIP: 0033:0x44a499 [ 44.351771] RSP: 002b:00007f9d147aada8 EFLAGS: 00000287 ORIG_RAX: 0000000000000133 [ 44.359460] RAX: ffffffffffffffda RBX: 00000000006dbd14 RCX: 000000000044a499 [ 44.366711] RDX: 0000000000000001 RSI: 0000000020001b00 RDI: 000000000000002a [ 44.373997] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 [ 44.381255] R10: 0000000000000000 R11: 0000000000000287 R12: 00000000006dbd10 [ 44.388521] R13: 70756f7267632f2e R14: 632e746573757063 R15: 0000000000000023 [ 44.396208] Dumping ftrace buffer: [ 44.399736] (ftrace buffer empty) [ 44.403424] Kernel Offset: disabled [ 44.407051] Rebooting in 86400 seconds..