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 '10.128.10.19' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 39.373455] ================================================================== [ 39.380852] BUG: KMSAN: uninit-value in crc32c_pcl_intel_update+0x2af/0x500 [ 39.387930] CPU: 0 PID: 3577 Comm: syzkaller253015 Not tainted 4.16.0+ #83 [ 39.394912] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 39.404242] Call Trace: [ 39.406802] [ 39.408933] dump_stack+0x185/0x1d0 [ 39.412535] ? crc32c_pcl_intel_update+0x2af/0x500 [ 39.417438] kmsan_report+0x142/0x240 [ 39.421216] __msan_warning_32+0x6c/0xb0 [ 39.425253] crc32c_pcl_intel_update+0x2af/0x500 [ 39.430011] ? crc32c_intel_cra_init+0x80/0x80 [ 39.434569] crypto_shash_update+0x1e9/0x210 [ 39.438954] crc32c+0x155/0x210 [ 39.442213] sctp_csum_update+0x89/0xa0 [ 39.446162] __skb_checksum+0x234/0x1010 [ 39.450196] ? __msan_metadata_ptr_for_load_8+0x10/0x20 [ 39.455531] ? __pskb_pull_tail+0x1154/0x22e0 [ 39.460000] ? kmsan_memcpy_origins+0xf1/0x170 [ 39.464566] ? sctp_has_association+0x160/0x160 [ 39.469207] sctp_rcv+0xf4e/0x4c90 [ 39.472721] ? raw_rcv+0x680/0x730 [ 39.476235] ? sctp_has_association+0x160/0x160 [ 39.480879] ? sctp_csum_update+0xa0/0xa0 [ 39.485008] ? sctp_csum_combine+0xa0/0xa0 [ 39.489216] ip_local_deliver_finish+0x6ed/0xd40 [ 39.494034] ip_local_deliver+0x43c/0x4e0 [ 39.498159] ? ip_local_deliver+0x4e0/0x4e0 [ 39.502457] ? ip_call_ra_chain+0x7b0/0x7b0 [ 39.506752] ip_rcv_finish+0x1253/0x16d0 [ 39.510903] ip_rcv+0x119d/0x16f0 [ 39.514333] ? ip_rcv+0x16f0/0x16f0 [ 39.517938] __netif_receive_skb_core+0x47cf/0x4a80 [ 39.522929] ? kmsan_internal_memset_shadow_inline+0xd0/0xd0 [ 39.528703] ? ip_local_deliver_finish+0xd40/0xd40 [ 39.533607] process_backlog+0x62d/0xe20 [ 39.537645] ? rps_trigger_softirq+0x2f0/0x2f0 [ 39.542200] net_rx_action+0x7c1/0x1a70 [ 39.546161] ? net_tx_action+0xab0/0xab0 [ 39.550197] __do_softirq+0x56d/0x93d [ 39.553974] do_softirq_own_stack+0x2a/0x40 [ 39.558264] [ 39.560477] __local_bh_enable_ip+0x114/0x140 [ 39.564958] local_bh_enable+0x36/0x40 [ 39.568820] ip_finish_output2+0x124e/0x1380 [ 39.573206] ip_finish_output+0xcb0/0xff0 [ 39.577331] ip_output+0x502/0x5c0 [ 39.580846] ? ip_mc_finish_output+0x3b0/0x3b0 [ 39.585406] ? ip_finish_output+0xff0/0xff0 [ 39.589700] ip_send_skb+0x5f3/0x820 [ 39.593387] ? __ip_local_out+0x5b0/0x5b0 [ 39.597508] ip_push_pending_frames+0x105/0x170 [ 39.602154] raw_sendmsg+0x2960/0x3ed0 [ 39.606015] ? __msan_metadata_ptr_for_store_1+0x13/0x20 [ 39.611439] ? __msan_metadata_ptr_for_store_8+0x13/0x20 [ 39.616869] ? compat_raw_ioctl+0x100/0x100 [ 39.621165] inet_sendmsg+0x48d/0x740 [ 39.624939] ? security_socket_sendmsg+0x9e/0x210 [ 39.629764] ? inet_getname+0x500/0x500 [ 39.633712] SYSC_sendto+0x6c3/0x7e0 [ 39.637400] ? __msan_metadata_ptr_for_store_4+0x13/0x20 [ 39.642826] ? prepare_exit_to_usermode+0x149/0x3a0 [ 39.647819] SyS_sendto+0x8a/0xb0 [ 39.651252] do_syscall_64+0x309/0x430 [ 39.655115] ? SYSC_getpeername+0x560/0x560 [ 39.659422] entry_SYSCALL_64_after_hwframe+0x3d/0xa2 [ 39.664587] RIP: 0033:0x43fde9 [ 39.667751] RSP: 002b:00007ffe3a15f558 EFLAGS: 00000217 ORIG_RAX: 000000000000002c [ 39.675442] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fde9 [ 39.682687] RDX: 000000000000001c RSI: 0000000020000000 RDI: 0000000000000003 [ 39.689932] RBP: 00000000006ca018 R08: 00000000200000c0 R09: 0000000000000010 [ 39.697177] R10: 0000000000000000 R11: 0000000000000217 R12: 0000000000401710 [ 39.704421] R13: 00000000004017a0 R14: 0000000000000000 R15: 0000000000000000 [ 39.711667] [ 39.713266] Uninit was stored to memory at: [ 39.717560] kmsan_internal_chain_origin+0x12b/0x210 [ 39.722634] kmsan_memcpy_origins+0x11d/0x170 [ 39.727102] __msan_memcpy+0x19f/0x1f0 [ 39.730967] skb_copy_bits+0x63a/0xdb0 [ 39.734839] __pskb_pull_tail+0x483/0x22e0 [ 39.739059] sctp_rcv+0x673/0x4c90 [ 39.742572] ip_local_deliver_finish+0x6ed/0xd40 [ 39.747300] ip_local_deliver+0x43c/0x4e0 [ 39.751420] ip_rcv_finish+0x1253/0x16d0 [ 39.755455] ip_rcv+0x119d/0x16f0 [ 39.758880] __netif_receive_skb_core+0x47cf/0x4a80 [ 39.763868] process_backlog+0x62d/0xe20 [ 39.767900] net_rx_action+0x7c1/0x1a70 [ 39.771848] __do_softirq+0x56d/0x93d [ 39.775615] Uninit was created at: [ 39.779128] kmsan_alloc_meta_for_pages+0x161/0x3a0 [ 39.784122] kmsan_alloc_page+0x82/0xe0 [ 39.788079] __alloc_pages_nodemask+0xf5b/0x5dc0 [ 39.792806] alloc_pages_current+0x6b5/0x970 [ 39.797195] skb_page_frag_refill+0x3ba/0x5e0 [ 39.801662] sk_page_frag_refill+0xa4/0x340 [ 39.805954] __ip_append_data+0x107e/0x3d10 [ 39.810246] ip_append_data+0x2fb/0x440 [ 39.814194] raw_sendmsg+0x287b/0x3ed0 [ 39.818063] inet_sendmsg+0x48d/0x740 [ 39.821839] SYSC_sendto+0x6c3/0x7e0 [ 39.825538] SyS_sendto+0x8a/0xb0 [ 39.828968] do_syscall_64+0x309/0x430 [ 39.832841] entry_SYSCALL_64_after_hwframe+0x3d/0xa2 [ 39.838012] ================================================================== [ 39.845347] Disabling lock debugging due to kernel taint [ 39.850782] Kernel panic - not syncing: panic_on_warn set ... [ 39.850782] [ 39.858120] CPU: 0 PID: 3577 Comm: syzkaller253015 Tainted: G B 4.16.0+ #83 [ 39.866404] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 39.875728] Call Trace: [ 39.878286] [ 39.880423] dump_stack+0x185/0x1d0 [ 39.884025] panic+0x39d/0x940 [ 39.887202] ? crc32c_pcl_intel_update+0x2af/0x500 [ 39.892102] kmsan_report+0x238/0x240 [ 39.895877] __msan_warning_32+0x6c/0xb0 [ 39.899914] crc32c_pcl_intel_update+0x2af/0x500 [ 39.904656] ? crc32c_intel_cra_init+0x80/0x80 [ 39.909213] crypto_shash_update+0x1e9/0x210 [ 39.913598] crc32c+0x155/0x210 [ 39.916862] sctp_csum_update+0x89/0xa0 [ 39.920810] __skb_checksum+0x234/0x1010 [ 39.924842] ? __msan_metadata_ptr_for_load_8+0x10/0x20 [ 39.930180] ? __pskb_pull_tail+0x1154/0x22e0 [ 39.934648] ? kmsan_memcpy_origins+0xf1/0x170 [ 39.939204] ? sctp_has_association+0x160/0x160 [ 39.943845] sctp_rcv+0xf4e/0x4c90 [ 39.947361] ? raw_rcv+0x680/0x730 [ 39.950876] ? sctp_has_association+0x160/0x160 [ 39.955517] ? sctp_csum_update+0xa0/0xa0 [ 39.959654] ? sctp_csum_combine+0xa0/0xa0 [ 39.963870] ip_local_deliver_finish+0x6ed/0xd40 [ 39.968600] ip_local_deliver+0x43c/0x4e0 [ 39.972727] ? ip_local_deliver+0x4e0/0x4e0 [ 39.977022] ? ip_call_ra_chain+0x7b0/0x7b0 [ 39.981315] ip_rcv_finish+0x1253/0x16d0 [ 39.985353] ip_rcv+0x119d/0x16f0 [ 39.988781] ? ip_rcv+0x16f0/0x16f0 [ 39.993001] __netif_receive_skb_core+0x47cf/0x4a80 [ 39.997996] ? kmsan_internal_memset_shadow_inline+0xd0/0xd0 [ 40.003769] ? ip_local_deliver_finish+0xd40/0xd40 [ 40.008672] process_backlog+0x62d/0xe20 [ 40.012709] ? rps_trigger_softirq+0x2f0/0x2f0 [ 40.017260] net_rx_action+0x7c1/0x1a70 [ 40.021211] ? net_tx_action+0xab0/0xab0 [ 40.025246] __do_softirq+0x56d/0x93d [ 40.029022] do_softirq_own_stack+0x2a/0x40 [ 40.033315] [ 40.035529] __local_bh_enable_ip+0x114/0x140 [ 40.040000] local_bh_enable+0x36/0x40 [ 40.043863] ip_finish_output2+0x124e/0x1380 [ 40.048248] ip_finish_output+0xcb0/0xff0 [ 40.052372] ip_output+0x502/0x5c0 [ 40.055887] ? ip_mc_finish_output+0x3b0/0x3b0 [ 40.060444] ? ip_finish_output+0xff0/0xff0 [ 40.064740] ip_send_skb+0x5f3/0x820 [ 40.068434] ? __ip_local_out+0x5b0/0x5b0 [ 40.072567] ip_push_pending_frames+0x105/0x170 [ 40.077210] raw_sendmsg+0x2960/0x3ed0 [ 40.081074] ? __msan_metadata_ptr_for_store_1+0x13/0x20 [ 40.086499] ? __msan_metadata_ptr_for_store_8+0x13/0x20 [ 40.091926] ? compat_raw_ioctl+0x100/0x100 [ 40.096226] inet_sendmsg+0x48d/0x740 [ 40.099999] ? security_socket_sendmsg+0x9e/0x210 [ 40.104817] ? inet_getname+0x500/0x500 [ 40.108766] SYSC_sendto+0x6c3/0x7e0 [ 40.112455] ? __msan_metadata_ptr_for_store_4+0x13/0x20 [ 40.117877] ? prepare_exit_to_usermode+0x149/0x3a0 [ 40.122880] SyS_sendto+0x8a/0xb0 [ 40.126308] do_syscall_64+0x309/0x430 [ 40.130170] ? SYSC_getpeername+0x560/0x560 [ 40.134467] entry_SYSCALL_64_after_hwframe+0x3d/0xa2 [ 40.139629] RIP: 0033:0x43fde9 [ 40.142789] RSP: 002b:00007ffe3a15f558 EFLAGS: 00000217 ORIG_RAX: 000000000000002c [ 40.150468] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fde9 [ 40.157713] RDX: 000000000000001c RSI: 0000000020000000 RDI: 0000000000000003 [ 40.164957] RBP: 00000000006ca018 R08: 00000000200000c0 R09: 0000000000000010 [ 40.172211] R10: 0000000000000000 R11: 0000000000000217 R12: 0000000000401710 [ 40.179456] R13: 00000000004017a0 R14: 0000000000000000 R15: 0000000000000000 [ 40.187109] Dumping ftrace buffer: [ 40.190625] (ftrace buffer empty) [ 40.194307] Kernel Offset: disabled [ 40.197906] Rebooting in 86400 seconds..