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

syzkaller login: [  783.235100] Not allocated shadow for addr ffff8801d4234000 (page ffffea000af8d380)
[  783.242896] Attempted to access 270 bytes
[  783.247070] ------------[ cut here ]------------
[  783.251809] kernel BUG at mm/kmsan/kmsan.c:1326!
[  783.256613] invalid opcode: 0000 [#1] SMP PTI
[  783.261202] Dumping ftrace buffer:
[  783.264732]    (ftrace buffer empty)
[  783.268436] Modules linked in:
[  783.271620] CPU: 0 PID: 4563 Comm: sshd Not tainted 4.16.0+ #87
[  783.277664] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[  783.287070] RIP: 0010:kmsan_get_shadow_address+0x1ce/0x1f0
[  783.292685] RSP: 0018:ffff8801d93ce648 EFLAGS: 00010082
[  783.298130] RAX: 000000000000001d RBX: 0000000000000740 RCX: 0000000000000000
[  783.305380] RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000000
[  783.312632] RBP: ffff8801d93ce660 R08: 0000000000000000 R09: 0000000000000001
[  783.319908] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801d4234000
[  783.327159] R13: 000000000000010e R14: 0000000000000001 R15: 000000000000010e
[  783.334424] FS:  00007fcbc31c17c0(0000) GS:ffff88021fc00000(0000) knlGS:0000000000000000
[  783.342632] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  783.348498] CR2: 00007fcbc2614f70 CR3: 00000001cabc8000 CR4: 00000000001406f0
[  783.355858] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[  783.363121] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[  783.370380] Call Trace:
[  783.372960]  kmsan_internal_unpoison_shadow+0x5c/0xe0
[  783.378146]  kmsan_unpoison_shadow+0x66/0xb0
[  783.382603]  virtqueue_get_buf_ctx+0x742/0xa20
[  783.387174]  virtqueue_get_buf+0x72/0x90
[  783.391272]  start_xmit+0x293/0x29a0
[  783.395008]  ? packet_rcv+0x21a0/0x21a0
[  783.398975]  ? virtnet_close+0x2c0/0x2c0
[  783.403068]  dev_hard_start_xmit+0x5f1/0xc70
[  783.407516]  sch_direct_xmit+0x540/0x8f0
[  783.411565]  __qdisc_run+0x1785/0x3730
[  783.415438]  ? __msan_metadata_ptr_for_load_8+0x10/0x20
[  783.420790]  __dev_queue_xmit+0x1d50/0x3520
[  783.425217]  ? __msan_metadata_ptr_for_load_8+0x10/0x20
[  783.430569]  dev_queue_xmit+0x4b/0x60
[  783.434404]  ip_finish_output2+0x12a1/0x1470
[  783.438796]  ip_finish_output+0xcb2/0xff0
[  783.442936]  ip_output+0x505/0x5d0
[  783.446463]  ? ip_mc_finish_output+0x3b0/0x3b0
[  783.451028]  ? ip_finish_output+0xff0/0xff0
[  783.455333]  ip_queue_xmit+0x1a1e/0x1d10
[  783.459376]  ? __msan_metadata_ptr_for_store_2+0x13/0x20
[  783.464810]  ? kmsan_set_origin+0x9e/0x160
[  783.469030]  ? ip_output+0x5d0/0x5d0
[  783.472776]  tcp_transmit_skb+0x3d81/0x53d0
[  783.477090]  tcp_write_xmit+0x3911/0xb920
[  783.481234]  __tcp_push_pending_frames+0x124/0x3f0
[  783.486148]  tcp_push+0x8b6/0x9c0
[  783.489588]  tcp_sendmsg_locked+0x5450/0x6cf0
[  783.494087]  ? kmsan_set_origin_inline+0x6b/0x120
[  783.498918]  ? __msan_poison_alloca+0x15c/0x1d0
[  783.503581]  tcp_sendmsg+0xb2/0x100
[  783.507192]  ? tcp_sendmsg_locked+0x6cf0/0x6cf0
[  783.511872]  inet_sendmsg+0x48d/0x740
[  783.515699]  ? security_socket_sendmsg+0x9e/0x210
[  783.520529]  ? inet_getname+0x500/0x500
[  783.524517]  sock_write_iter+0x3b9/0x470
[  783.528563]  ? sock_read_iter+0x480/0x480
[  783.532692]  __vfs_write+0x7fb/0x9f0
[  783.536392]  vfs_write+0x463/0x8d0
[  783.539918]  SYSC_write+0x172/0x360
[  783.543529]  SyS_write+0x55/0x80
[  783.546875]  do_syscall_64+0x309/0x430
[  783.550752]  ? SYSC_read+0x360/0x360
[  783.554510]  entry_SYSCALL_64_after_hwframe+0x3d/0xa2
[  783.559683] RIP: 0033:0x7fcbc155c370
[  783.563376] RSP: 002b:00007ffc0d9f6148 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
[  783.571071] RAX: ffffffffffffffda RBX: 0000000000000138 RCX: 00007fcbc155c370
[  783.578330] RDX: 0000000000000138 RSI: 0000560ea5577440 RDI: 0000000000000003
[  783.585588] RBP: 0000560ea5577440 R08: 0000560ea5575590 R09: 0000560ea46ca820
[  783.592840] R10: 000000004576ee20 R11: 0000000000000246 R12: 00007ffc0d9f61ac
[  783.600094] R13: 0000000000000001 R14: 0000560ea557d4a0 R15: 0000000000000000
[  783.607345] Code: 75 29 48 c7 c7 fd 92 7d 8a 31 c0 e8 4d 68 86 ff 80 3c 25 e8 03 2c 8b 00 75 11 48 c7 c7 2d 93 7d 8a 31 c0 4c 89 fe e8 32 68 86 ff <0f> 0b eb fe 48 3d ff ff ff 1f 0f 87 a2 fe ff ff 48 8b 1c 25 10 
[  783.626451] RIP: kmsan_get_shadow_address+0x1ce/0x1f0 RSP: ffff8801d93ce648
[  783.633536] ---[ end trace 12e4c98c041f3f1e ]---
[  783.638276] Kernel panic - not syncing: Fatal exception in interrupt
[  783.645322] Dumping ftrace buffer:
[  783.648841]    (ftrace buffer empty)
[  783.652585] Kernel Offset: disabled
[  783.656191] Rebooting in 86400 seconds..