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 '10.128.0.60' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 31.122337] ================================================================== [ 31.129719] BUG: KMSAN: uninit-value in csum_partial+0x78e/0x850 [ 31.135875] CPU: 0 PID: 3478 Comm: syzkaller712612 Not tainted 4.16.0+ #83 [ 31.142858] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.152183] Call Trace: [ 31.154740] [ 31.156872] dump_stack+0x185/0x1d0 [ 31.160479] ? csum_partial+0x78e/0x850 [ 31.164428] kmsan_report+0x142/0x240 [ 31.168205] __msan_warning_32+0x6c/0xb0 [ 31.172243] csum_partial+0x78e/0x850 [ 31.176033] csum_partial_ext+0x89/0xa0 [ 31.179991] __skb_checksum+0x6d4/0x1010 [ 31.184045] ? skb_checksum+0x120/0x120 [ 31.188002] skb_checksum+0xec/0x120 [ 31.191696] ? skb_checksum+0x120/0x120 [ 31.195647] ? csum_partial_ext+0xa0/0xa0 [ 31.199772] __skb_checksum_complete+0x90/0x400 [ 31.204416] __udp4_lib_rcv+0x3156/0x4740 [ 31.208547] udp_rcv+0x5c/0x70 [ 31.211724] ? udp_v4_early_demux+0x1cd0/0x1cd0 [ 31.216369] ip_local_deliver_finish+0x6ed/0xd40 [ 31.221108] ip_local_deliver+0x43c/0x4e0 [ 31.225231] ? ip_local_deliver+0x4e0/0x4e0 [ 31.229528] ? ip_call_ra_chain+0x7b0/0x7b0 [ 31.233823] ip_rcv_finish+0x1253/0x16d0 [ 31.237864] ip_rcv+0x119d/0x16f0 [ 31.241290] ? ip_rcv+0x16f0/0x16f0 [ 31.244896] __netif_receive_skb_core+0x47cf/0x4a80 [ 31.249890] ? kmsan_internal_memset_shadow_inline+0xd0/0xd0 [ 31.255665] ? ip_local_deliver_finish+0xd40/0xd40 [ 31.260569] process_backlog+0x62d/0xe20 [ 31.264607] ? rps_trigger_softirq+0x2f0/0x2f0 [ 31.269165] net_rx_action+0x7c1/0x1a70 [ 31.273118] ? net_tx_action+0xab0/0xab0 [ 31.277155] __do_softirq+0x56d/0x93d [ 31.280939] do_softirq_own_stack+0x2a/0x40 [ 31.285233] [ 31.287445] __local_bh_enable_ip+0x114/0x140 [ 31.291925] local_bh_enable+0x36/0x40 [ 31.295785] ip_finish_output2+0x124e/0x1380 [ 31.300169] ip_finish_output+0xcb0/0xff0 [ 31.304292] ip_output+0x502/0x5c0 [ 31.307807] ? ip_mc_finish_output+0x3b0/0x3b0 [ 31.312365] ? ip_finish_output+0xff0/0xff0 [ 31.316661] ip_send_skb+0x5f3/0x820 [ 31.320349] ? __ip_local_out+0x5b0/0x5b0 [ 31.324477] udp_send_skb+0xe97/0x1320 [ 31.328743] udp_sendmsg+0xa24/0x3180 [ 31.332521] ? ip_copy_metadata+0xac0/0xac0 [ 31.336818] ? __msan_metadata_ptr_for_store_8+0x13/0x20 [ 31.342245] ? kmsan_set_origin_inline+0x6b/0x120 [ 31.347062] ? __msan_poison_alloca+0x15c/0x1d0 [ 31.351710] ? udp_send_skb+0x1320/0x1320 [ 31.355840] inet_sendmsg+0x48d/0x740 [ 31.359617] ? security_socket_sendmsg+0x9e/0x210 [ 31.364435] ? inet_getname+0x500/0x500 [ 31.368385] SYSC_sendto+0x6c3/0x7e0 [ 31.372079] SyS_sendto+0x8a/0xb0 [ 31.375507] do_syscall_64+0x309/0x430 [ 31.379370] ? SYSC_getpeername+0x560/0x560 [ 31.383668] entry_SYSCALL_64_after_hwframe+0x3d/0xa2 [ 31.388832] RIP: 0033:0x43fde9 [ 31.391997] RSP: 002b:00007ffc27874828 EFLAGS: 00000217 ORIG_RAX: 000000000000002c [ 31.399685] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fde9 [ 31.406929] RDX: 0000000000000287 RSI: 000000002029b000 RDI: 0000000000000003 [ 31.414175] RBP: 00000000006ca018 R08: 0000000020778000 R09: 0000000000000010 [ 31.421417] R10: 0000000000000000 R11: 0000000000000217 R12: 0000000000401710 [ 31.428659] R13: 00000000004017a0 R14: 0000000000000000 R15: 0000000000000000 [ 31.435904] [ 31.437503] Uninit was created at: [ 31.441029] kmsan_alloc_meta_for_pages+0x161/0x3a0 [ 31.446034] kmsan_alloc_page+0x82/0xe0 [ 31.449989] __alloc_pages_nodemask+0xf5b/0x5dc0 [ 31.454724] alloc_pages_current+0x6b5/0x970 [ 31.459106] skb_page_frag_refill+0x3ba/0x5e0 [ 31.463575] sk_page_frag_refill+0xa4/0x340 [ 31.467871] __ip_append_data+0x107e/0x3d10 [ 31.472163] ip_append_data+0x2fb/0x440 [ 31.476113] udp_sendmsg+0x746/0x3180 [ 31.479885] inet_sendmsg+0x48d/0x740 [ 31.483673] SYSC_sendto+0x6c3/0x7e0 [ 31.487360] SyS_sendto+0x8a/0xb0 [ 31.490787] do_syscall_64+0x309/0x430 [ 31.494652] entry_SYSCALL_64_after_hwframe+0x3d/0xa2 [ 31.499810] ================================================================== [ 31.507140] Disabling lock debugging due to kernel taint [ 31.512562] Kernel panic - not syncing: panic_on_warn set ... [ 31.512562] [ 31.519901] CPU: 0 PID: 3478 Comm: syzkaller712612 Tainted: G B 4.16.0+ #83 [ 31.528191] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.537519] Call Trace: [ 31.540096] [ 31.542225] dump_stack+0x185/0x1d0 [ 31.545830] panic+0x39d/0x940 [ 31.549009] ? csum_partial+0x78e/0x850 [ 31.552968] kmsan_report+0x238/0x240 [ 31.556742] __msan_warning_32+0x6c/0xb0 [ 31.560778] csum_partial+0x78e/0x850 [ 31.564560] csum_partial_ext+0x89/0xa0 [ 31.568511] __skb_checksum+0x6d4/0x1010 [ 31.572559] ? skb_checksum+0x120/0x120 [ 31.576510] skb_checksum+0xec/0x120 [ 31.580196] ? skb_checksum+0x120/0x120 [ 31.584142] ? csum_partial_ext+0xa0/0xa0 [ 31.588268] __skb_checksum_complete+0x90/0x400 [ 31.592912] __udp4_lib_rcv+0x3156/0x4740 [ 31.597056] udp_rcv+0x5c/0x70 [ 31.600233] ? udp_v4_early_demux+0x1cd0/0x1cd0 [ 31.604875] ip_local_deliver_finish+0x6ed/0xd40 [ 31.609606] ip_local_deliver+0x43c/0x4e0 [ 31.613733] ? ip_local_deliver+0x4e0/0x4e0 [ 31.618042] ? ip_call_ra_chain+0x7b0/0x7b0 [ 31.622342] ip_rcv_finish+0x1253/0x16d0 [ 31.626378] ip_rcv+0x119d/0x16f0 [ 31.629804] ? ip_rcv+0x16f0/0x16f0 [ 31.633410] __netif_receive_skb_core+0x47cf/0x4a80 [ 31.638404] ? kmsan_internal_memset_shadow_inline+0xd0/0xd0 [ 31.644178] ? ip_local_deliver_finish+0xd40/0xd40 [ 31.649092] process_backlog+0x62d/0xe20 [ 31.653139] ? rps_trigger_softirq+0x2f0/0x2f0 [ 31.657695] net_rx_action+0x7c1/0x1a70 [ 31.661651] ? net_tx_action+0xab0/0xab0 [ 31.665690] __do_softirq+0x56d/0x93d [ 31.669471] do_softirq_own_stack+0x2a/0x40 [ 31.673766] [ 31.675981] __local_bh_enable_ip+0x114/0x140 [ 31.680452] local_bh_enable+0x36/0x40 [ 31.684316] ip_finish_output2+0x124e/0x1380 [ 31.688701] ip_finish_output+0xcb0/0xff0 [ 31.692827] ip_output+0x502/0x5c0 [ 31.696341] ? ip_mc_finish_output+0x3b0/0x3b0 [ 31.700898] ? ip_finish_output+0xff0/0xff0 [ 31.705195] ip_send_skb+0x5f3/0x820 [ 31.708882] ? __ip_local_out+0x5b0/0x5b0 [ 31.713008] udp_send_skb+0xe97/0x1320 [ 31.716884] udp_sendmsg+0xa24/0x3180 [ 31.720660] ? ip_copy_metadata+0xac0/0xac0 [ 31.724959] ? __msan_metadata_ptr_for_store_8+0x13/0x20 [ 31.730385] ? kmsan_set_origin_inline+0x6b/0x120 [ 31.735202] ? __msan_poison_alloca+0x15c/0x1d0 [ 31.739851] ? udp_send_skb+0x1320/0x1320 [ 31.743975] inet_sendmsg+0x48d/0x740 [ 31.747760] ? security_socket_sendmsg+0x9e/0x210 [ 31.752579] ? inet_getname+0x500/0x500 [ 31.756530] SYSC_sendto+0x6c3/0x7e0 [ 31.760224] SyS_sendto+0x8a/0xb0 [ 31.763655] do_syscall_64+0x309/0x430 [ 31.767530] ? SYSC_getpeername+0x560/0x560 [ 31.771829] entry_SYSCALL_64_after_hwframe+0x3d/0xa2 [ 31.776989] RIP: 0033:0x43fde9 [ 31.780155] RSP: 002b:00007ffc27874828 EFLAGS: 00000217 ORIG_RAX: 000000000000002c [ 31.787835] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fde9 [ 31.795080] RDX: 0000000000000287 RSI: 000000002029b000 RDI: 0000000000000003 [ 31.802324] RBP: 00000000006ca018 R08: 0000000020778000 R09: 0000000000000010 [ 31.809568] R10: 0000000000000000 R11: 0000000000000217 R12: 0000000000401710 [ 31.816812] R13: 00000000004017a0 R14: 0000000000000000 R15: 0000000000000000 [ 31.824111] Dumping ftrace buffer: [ 31.827626] (ftrace buffer empty) [ 31.831306] Kernel Offset: disabled [ 31.834911] Rebooting in 86400 seconds..