[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 77.686419] audit: type=1800 audit(1550639997.742:25): pid=10223 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 77.709817] audit: type=1800 audit(1550639997.742:26): pid=10223 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 77.729414] audit: type=1800 audit(1550639997.742:27): pid=10223 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [....] 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 '10.128.10.57' (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 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program 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: [ 105.659201] ================================================================== [ 105.666632] BUG: KMSAN: uninit-value in gue6_err+0x475/0xc40 [ 105.672461] CPU: 1 PID: 12868 Comm: syz-executor059 Not tainted 5.0.0-rc1+ #9 [ 105.679749] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 105.689116] Call Trace: [ 105.691714] [ 105.693882] dump_stack+0x173/0x1d0 [ 105.697550] kmsan_report+0x12e/0x2a0 [ 105.701831] __msan_warning+0x82/0xf0 [ 105.705653] gue6_err+0x475/0xc40 executing program executing program [ 105.709152] ? fou6_build_header+0x640/0x640 [ 105.713583] __udp6_lib_err+0x18d0/0x2590 [ 105.717785] udpv6_err+0x118/0x130 [ 105.721358] icmpv6_notify+0x462/0x9f0 [ 105.725265] ? secondary_startup_64+0xa7/0xb0 [ 105.729786] ? udpv6_rcv+0x70/0x70 [ 105.733354] icmpv6_rcv+0x18ac/0x3fa0 [ 105.737211] ? kmsan_get_shadow_origin_ptr+0x60/0x440 [ 105.742426] ? icmpv6_sk_exit+0x2c0/0x2c0 [ 105.746600] ip6_protocol_deliver_rcu+0xb5a/0x23a0 [ 105.751578] ? kmsan_get_shadow_origin_ptr+0x60/0x440 executing program executing program executing program [ 105.756808] ip6_input+0x2b6/0x350 [ 105.760377] ? ip6_input+0x350/0x350 [ 105.764109] ? ip6_protocol_deliver_rcu+0x23a0/0x23a0 [ 105.769323] ip6_rcv_finish+0x4e7/0x6d0 [ 105.773328] ipv6_rcv+0x34b/0x3f0 [ 105.776822] ? local_bh_enable+0x40/0x40 [ 105.780907] process_backlog+0x756/0x10e0 [ 105.785078] ? lapic_next_event+0x6f/0xa0 [ 105.789257] ? ip6_rcv_finish+0x6d0/0x6d0 [ 105.793429] ? rps_trigger_softirq+0x2e0/0x2e0 [ 105.798040] net_rx_action+0x78b/0x1a60 [ 105.802057] ? net_tx_action+0xca0/0xca0 [ 105.806141] __do_softirq+0x53f/0x93a executing program executing program executing program [ 105.810042] do_softirq_own_stack+0x49/0x80 [ 105.814466] [ 105.816735] __local_bh_enable_ip+0x16f/0x1a0 [ 105.821261] local_bh_enable+0x36/0x40 [ 105.825168] ip6_finish_output2+0x1d64/0x25f0 [ 105.829708] ? kmsan_get_shadow_origin_ptr+0x60/0x440 [ 105.834924] ip6_finish_output+0xae4/0xbc0 [ 105.839203] ip6_output+0x5ca/0x710 [ 105.842860] ? ip6_output+0x710/0x710 [ 105.846681] ? ac6_seq_show+0x200/0x200 [ 105.850686] ip6_local_out+0x164/0x1d0 [ 105.854607] ip6_send_skb+0xfa/0x390 executing program executing program executing program [ 105.858350] udp_v6_send_skb+0x1733/0x1d20 [ 105.862628] udpv6_sendmsg+0x424e/0x45d0 [ 105.867727] ? ip_copy_metadata+0x1010/0x1010 [ 105.872270] ? __msan_metadata_ptr_for_load_8+0x10/0x20 [ 105.877680] ? __udp6_lib_rcv+0x3e80/0x3e80 [ 105.882036] inet_sendmsg+0x54a/0x720 [ 105.885863] ? kmsan_get_shadow_origin_ptr+0x60/0x440 [ 105.891080] ___sys_sendmsg+0xdb9/0x11b0 [ 105.895169] ? inet_getname+0x490/0x490 [ 105.899173] ? kmsan_get_shadow_origin_ptr+0x60/0x440 [ 105.904388] ? __msan_metadata_ptr_for_load_1+0x10/0x20 executing program executing program [ 105.909768] ? __fget_light+0x6e1/0x750 [ 105.913771] ? kmsan_get_shadow_origin_ptr+0x60/0x440 [ 105.918984] __sys_sendmmsg+0x580/0xad0 [ 105.923024] ? __msan_metadata_ptr_for_store_4+0x13/0x20 [ 105.928494] ? prepare_exit_to_usermode+0x114/0x420 [ 105.933554] ? kmsan_get_shadow_origin_ptr+0x60/0x440 [ 105.938767] __se_sys_sendmmsg+0xbd/0xe0 [ 105.942866] __x64_sys_sendmmsg+0x56/0x70 [ 105.947041] do_syscall_64+0xbc/0xf0 [ 105.950787] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 105.955995] RIP: 0033:0x446499 executing program executing program executing program [ 105.959207] Code: e8 0c e8 ff ff 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b 08 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 105.978564] RSP: 002b:00007f7d55111db8 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 [ 105.986289] RAX: ffffffffffffffda RBX: 00000000006dbc38 RCX: 0000000000446499 [ 105.993571] RDX: 00000000000004ff RSI: 00000000200092c0 RDI: 0000000000000006 [ 106.000870] RBP: 00000000006dbc30 R08: 0000000000000000 R09: 0000000000000000 executing program executing program [ 106.008173] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dbc3c [ 106.015463] R13: 00007ffc4397c25f R14: 00007f7d551129c0 R15: 0000000000000001 [ 106.022766] [ 106.024403] Uninit was created at: [ 106.027960] kmsan_internal_poison_shadow+0x92/0x150 [ 106.033174] kmsan_kmalloc+0xa6/0x130 [ 106.036998] kmsan_slab_alloc+0xe/0x10 [ 106.041285] __kmalloc_node_track_caller+0xe9e/0xff0 [ 106.046408] __alloc_skb+0x309/0xa20 [ 106.050201] alloc_skb_with_frags+0x1c7/0xac0 [ 106.051673] hrtimer: interrupt took 178636 ns executing program executing program [ 106.054710] sock_alloc_send_pskb+0xafd/0x10a0 [ 106.054734] sock_alloc_send_skb+0xca/0xe0 [ 106.068041] __ip6_append_data+0x42ed/0x5dc0 [ 106.072905] ip6_append_data+0x3c2/0x650 [ 106.076990] icmp6_send+0x2f5c/0x3c40 [ 106.080898] icmpv6_send+0xe5/0x110 [ 106.084548] __udp6_lib_rcv+0x277f/0x3e80 [ 106.088761] udpv6_rcv+0x5c/0x70 [ 106.092224] ip6_protocol_deliver_rcu+0xb5a/0x23a0 [ 106.097341] ip6_input+0x2b6/0x350 [ 106.100899] ip6_rcv_finish+0x4e7/0x6d0 [ 106.104892] ipv6_rcv+0x34b/0x3f0 executing program executing program executing program [ 106.108359] process_backlog+0x756/0x10e0 [ 106.112532] net_rx_action+0x78b/0x1a60 [ 106.116613] __do_softirq+0x53f/0x93a [ 106.120421] ================================================================== [ 106.127795] Disabling lock debugging due to kernel taint [ 106.133264] Kernel panic - not syncing: panic_on_warn set ... [ 106.139168] CPU: 1 PID: 12868 Comm: syz-executor059 Tainted: G B 5.0.0-rc1+ #9 [ 106.148024] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 106.157671] Call Trace: executing program executing program executing program [ 106.160278] [ 106.162583] dump_stack+0x173/0x1d0 [ 106.166523] panic+0x3d1/0xb01 [ 106.169769] kmsan_report+0x293/0x2a0 [ 106.173604] __msan_warning+0x82/0xf0 [ 106.177431] gue6_err+0x475/0xc40 [ 106.180931] ? fou6_build_header+0x640/0x640 [ 106.185358] __udp6_lib_err+0x18d0/0x2590 [ 106.189618] udpv6_err+0x118/0x130 [ 106.193232] icmpv6_notify+0x462/0x9f0 [ 106.197235] ? secondary_startup_64+0xa7/0xb0 [ 106.201750] ? udpv6_rcv+0x70/0x70 [ 106.205321] icmpv6_rcv+0x18ac/0x3fa0 executing program executing program executing program [ 106.209180] ? kmsan_get_shadow_origin_ptr+0x60/0x440 [ 106.214391] ? icmpv6_sk_exit+0x2c0/0x2c0 [ 106.218563] ip6_protocol_deliver_rcu+0xb5a/0x23a0 [ 106.223545] ? kmsan_get_shadow_origin_ptr+0x60/0x440 [ 106.228773] ip6_input+0x2b6/0x350 [ 106.232342] ? ip6_input+0x350/0x350 [ 106.236084] ? ip6_protocol_deliver_rcu+0x23a0/0x23a0 [ 106.241291] ip6_rcv_finish+0x4e7/0x6d0 [ 106.245305] ipv6_rcv+0x34b/0x3f0 [ 106.248792] ? local_bh_enable+0x40/0x40 [ 106.252877] process_backlog+0x756/0x10e0 [ 106.257059] ? lapic_next_event+0x6f/0xa0 executing program executing program [ 106.261277] ? ip6_rcv_finish+0x6d0/0x6d0 [ 106.265466] ? rps_trigger_softirq+0x2e0/0x2e0 [ 106.270081] net_rx_action+0x78b/0x1a60 [ 106.274087] ? net_tx_action+0xca0/0xca0 [ 106.278164] __do_softirq+0x53f/0x93a [ 106.281999] do_softirq_own_stack+0x49/0x80 [ 106.286342] [ 106.288606] __local_bh_enable_ip+0x16f/0x1a0 [ 106.293126] local_bh_enable+0x36/0x40 [ 106.297043] ip6_finish_output2+0x1d64/0x25f0 [ 106.301589] ? kmsan_get_shadow_origin_ptr+0x60/0x440 [ 106.306814] ip6_finish_output+0xae4/0xbc0 executing program executing program [ 106.311089] ip6_output+0x5ca/0x710 [ 106.314756] ? ip6_output+0x710/0x710 [ 106.318581] ? ac6_seq_show+0x200/0x200 [ 106.322572] ip6_local_out+0x164/0x1d0 [ 106.326491] ip6_send_skb+0xfa/0x390 [ 106.330242] udp_v6_send_skb+0x1733/0x1d20 [ 106.334532] udpv6_sendmsg+0x424e/0x45d0 [ 106.338622] ? ip_copy_metadata+0x1010/0x1010 [ 106.343172] ? __msan_metadata_ptr_for_load_8+0x10/0x20 [ 106.348596] ? __udp6_lib_rcv+0x3e80/0x3e80 [ 106.352938] inet_sendmsg+0x54a/0x720 [ 106.356765] ? kmsan_get_shadow_origin_ptr+0x60/0x440 executing program executing program executing program [ 106.362065] ___sys_sendmsg+0xdb9/0x11b0 [ 106.366156] ? inet_getname+0x490/0x490 [ 106.370159] ? kmsan_get_shadow_origin_ptr+0x60/0x440 [ 106.375370] ? __msan_metadata_ptr_for_load_1+0x10/0x20 [ 106.380762] ? __fget_light+0x6e1/0x750 [ 106.384779] ? kmsan_get_shadow_origin_ptr+0x60/0x440 [ 106.390025] __sys_sendmmsg+0x580/0xad0 [ 106.394064] ? __msan_metadata_ptr_for_store_4+0x13/0x20 [ 106.399544] ? prepare_exit_to_usermode+0x114/0x420 [ 106.404581] ? kmsan_get_shadow_origin_ptr+0x60/0x440 executing program executing program executing program [ 106.409792] __se_sys_sendmmsg+0xbd/0xe0 [ 106.413883] __x64_sys_sendmmsg+0x56/0x70 [ 106.418067] do_syscall_64+0xbc/0xf0 [ 106.421825] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 106.427129] RIP: 0033:0x446499 [ 106.430336] Code: e8 0c e8 ff ff 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b 08 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 106.449252] RSP: 002b:00007f7d55111db8 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 executing program [ 106.456985] RAX: ffffffffffffffda RBX: 00000000006dbc38 RCX: 0000000000446499 [ 106.464296] RDX: 00000000000004ff RSI: 00000000200092c0 RDI: 0000000000000006 [ 106.471581] RBP: 00000000006dbc30 R08: 0000000000000000 R09: 0000000000000000 [ 106.478862] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dbc3c [ 106.486145] R13: 00007ffc4397c25f R14: 00007f7d551129c0 R15: 0000000000000001 [ 106.494592] Kernel Offset: disabled [ 106.498223] Rebooting in 86400 seconds..