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: [  272.806904] Not allocated shadow for addr ffff8801d3c3c000 (page ffffea000af69680)
[  272.814620] Attempted to access 270 bytes
[  272.818757] ------------[ cut here ]------------
[  272.823490] kernel BUG at mm/kmsan/kmsan.c:1326!
[  272.828223] invalid opcode: 0000 [#1] SMP PTI
[  272.832687] Dumping ftrace buffer:
[  272.836199]    (ftrace buffer empty)
[  272.839884] Modules linked in:
[  272.843052] CPU: 1 PID: 4479 Comm: sshd Not tainted 4.16.0+ #85
[  272.849078] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[  272.858411] RIP: 0010:kmsan_get_shadow_address+0x1ce/0x1f0
[  272.864007] RSP: 0018:ffff8801b976e648 EFLAGS: 00010082
[  272.869341] RAX: 000000000000001d RBX: 0000000000000740 RCX: 0000000000000000
[  272.876582] RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000000
[  272.883824] RBP: ffff8801b976e660 R08: 0000000000000000 R09: 0000000000000001
[  272.891068] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801d3c3c000
[  272.898311] R13: 000000000000010e R14: 0000000000000001 R15: 000000000000010e
[  272.905558] FS:  00007f1c62f5a7c0(0000) GS:ffff88021fd00000(0000) knlGS:0000000000000000
[  272.913754] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  272.919610] CR2: 00007f1c623adf70 CR3: 00000001a9900000 CR4: 00000000001406e0
[  272.926855] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[  272.934097] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[  272.941341] Call Trace:
[  272.943906]  kmsan_internal_unpoison_shadow+0x5c/0xe0
[  272.949073]  kmsan_unpoison_shadow+0x66/0xb0
[  272.953457]  virtqueue_get_buf_ctx+0x742/0xa20
[  272.958016]  virtqueue_get_buf+0x72/0x90
[  272.962054]  start_xmit+0x293/0x29a0
[  272.965743]  ? packet_rcv+0x21a0/0x21a0
[  272.969695]  ? virtnet_close+0x2c0/0x2c0
[  272.973730]  dev_hard_start_xmit+0x5f1/0xc70
[  272.978121]  sch_direct_xmit+0x540/0x8f0
[  272.982157]  __qdisc_run+0x1785/0x3730
[  272.986021]  ? __msan_metadata_ptr_for_load_8+0x10/0x20
[  272.991359]  __dev_queue_xmit+0x1d50/0x3520
[  272.995656]  ? __msan_metadata_ptr_for_load_8+0x10/0x20
[  273.000996]  dev_queue_xmit+0x4b/0x60
[  273.004772]  ip_finish_output2+0x12a1/0x1470
[  273.009157]  ip_finish_output+0xcb2/0xff0
[  273.013280]  ip_output+0x505/0x5d0
[  273.016792]  ? ip_mc_finish_output+0x3b0/0x3b0
[  273.021349]  ? ip_finish_output+0xff0/0xff0
[  273.025642]  ip_queue_xmit+0x1a1e/0x1d10
[  273.029677]  ? __msan_metadata_ptr_for_store_2+0x13/0x20
[  273.035103]  ? kmsan_set_origin+0x9e/0x160
[  273.039315]  ? ip_output+0x5d0/0x5d0
[  273.043000]  tcp_transmit_skb+0x3d81/0x53d0
[  273.047301]  tcp_write_xmit+0x3911/0xb920
[  273.051435]  __tcp_push_pending_frames+0x124/0x3f0
[  273.056340]  tcp_push+0x8b6/0x9c0
[  273.059770]  tcp_sendmsg_locked+0x5450/0x6cf0
[  273.064244]  ? kmsan_set_origin_inline+0x6b/0x120
[  273.069060]  ? __msan_poison_alloca+0x15c/0x1d0
[  273.073707]  tcp_sendmsg+0xb2/0x100
[  273.077308]  ? tcp_sendmsg_locked+0x6cf0/0x6cf0
[  273.081952]  inet_sendmsg+0x48d/0x740
[  273.085727]  ? security_socket_sendmsg+0x9e/0x210
[  273.090543]  ? inet_getname+0x500/0x500
[  273.094490]  sock_write_iter+0x3b9/0x470
[  273.098526]  ? sock_read_iter+0x480/0x480
[  273.102647]  __vfs_write+0x7fb/0x9f0
[  273.106337]  vfs_write+0x463/0x8d0
[  273.109853]  SYSC_write+0x172/0x360
[  273.113455]  SyS_write+0x55/0x80
[  273.116794]  do_syscall_64+0x309/0x430
[  273.120656]  ? SYSC_read+0x360/0x360
[  273.124346]  entry_SYSCALL_64_after_hwframe+0x3d/0xa2
[  273.129508] RIP: 0033:0x7f1c612f5370
[  273.133194] RSP: 002b:00007fff79c4a258 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
[  273.140873] RAX: ffffffffffffffda RBX: 0000000000000138 RCX: 00007f1c612f5370
[  273.148117] RDX: 0000000000000138 RSI: 000055e9f1f73440 RDI: 0000000000000003
[  273.155360] RBP: 000055e9f1f73440 R08: 000055e9f1f714e0 R09: 000055e9f0f39820
[  273.162602] R10: 000000009ec07cb5 R11: 0000000000000246 R12: 00007fff79c4a2bc
[  273.169845] R13: 0000000000000001 R14: 000055e9f1f794a0 R15: 0000000000000000
[  273.177090] Code: 75 29 48 c7 c7 fd 92 7d 8a 31 c0 e8 9d 6a 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 82 6a 86 ff <0f> 0b eb fe 48 3d ff ff ff 1f 0f 87 a2 fe ff ff 48 8b 1c 25 10 
[  273.196165] RIP: kmsan_get_shadow_address+0x1ce/0x1f0 RSP: ffff8801b976e648
[  273.203239] ---[ end trace 003f23568d993f98 ]---
[  273.207965] Kernel panic - not syncing: Fatal exception in interrupt
[  273.214823] Dumping ftrace buffer:
[  273.218337]    (ftrace buffer empty)
[  273.222019] Kernel Offset: disabled
[  273.225615] Rebooting in 86400 seconds..