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: [   44.072235] Not allocated shadow for addr ffff8801d40dc000 (page ffffea000af85280)
[   44.079963] Attempted to access 270 bytes
[   44.084111] ------------[ cut here ]------------
[   44.088842] kernel BUG at mm/kmsan/kmsan.c:1326!
[   44.093584] invalid opcode: 0000 [#1] SMP PTI
[   44.098053] Dumping ftrace buffer:
[   44.101574]    (ftrace buffer empty)
[   44.105265] Modules linked in:
[   44.108437] CPU: 0 PID: 4529 Comm: sshd Not tainted 4.16.0+ #87
[   44.114467] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   44.123809] RIP: 0010:kmsan_get_shadow_address+0x1ce/0x1f0
[   44.129408] RSP: 0018:ffff8801bd7fe648 EFLAGS: 00010082
[   44.134749] RAX: 000000000000001d RBX: 0000000000000740 RCX: 0000000000000000
[   44.141996] RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000000
[   44.150025] RBP: ffff8801bd7fe660 R08: 0000000000000000 R09: 0000000000000001
[   44.157283] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801d40dc000
[   44.164531] R13: 000000000000010e R14: 0000000000000001 R15: 000000000000010e
[   44.171780] FS:  00007fe4b73567c0(0000) GS:ffff88021fc00000(0000) knlGS:0000000000000000
[   44.179986] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   44.185843] CR2: 00007fe4b67a9f70 CR3: 00000001c0a0a000 CR4: 00000000001406f0
[   44.193091] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   44.200338] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   44.207584] Call Trace:
[   44.210164]  kmsan_internal_unpoison_shadow+0x5c/0xe0
[   44.215332]  kmsan_unpoison_shadow+0x66/0xb0
[   44.219724]  virtqueue_get_buf_ctx+0x742/0xa20
[   44.224286]  virtqueue_get_buf+0x72/0x90
[   44.228324]  start_xmit+0x293/0x29a0
[   44.232017]  ? packet_rcv+0x21a0/0x21a0
[   44.235973]  ? virtnet_close+0x2c0/0x2c0
[   44.240022]  dev_hard_start_xmit+0x5f1/0xc70
[   44.244517]  sch_direct_xmit+0x540/0x8f0
[   44.248567]  __qdisc_run+0x1785/0x3730
[   44.252448]  ? __msan_metadata_ptr_for_load_8+0x10/0x20
[   44.257792]  __dev_queue_xmit+0x1d50/0x3520
[   44.262104]  ? __msan_metadata_ptr_for_load_8+0x10/0x20
[   44.267452]  dev_queue_xmit+0x4b/0x60
[   44.271232]  ip_finish_output2+0x12a1/0x1470
[   44.275629]  ip_finish_output+0xcb2/0xff0
[   44.279758]  ip_output+0x505/0x5d0
[   44.283275]  ? ip_mc_finish_output+0x3b0/0x3b0
[   44.287834]  ? ip_finish_output+0xff0/0xff0
[   44.292137]  ip_queue_xmit+0x1a1e/0x1d10
[   44.296177]  ? __msan_metadata_ptr_for_store_2+0x13/0x20
[   44.301607]  ? kmsan_set_origin+0x9e/0x160
[   44.305821]  ? ip_output+0x5d0/0x5d0
[   44.309527]  tcp_transmit_skb+0x3d81/0x53d0
[   44.313836]  tcp_write_xmit+0x3911/0xb920
[   44.317976]  __tcp_push_pending_frames+0x124/0x3f0
[   44.322886]  tcp_push+0x8b6/0x9c0
[   44.326324]  tcp_sendmsg_locked+0x5450/0x6cf0
[   44.330810]  ? kmsan_set_origin_inline+0x6b/0x120
[   44.335632]  ? __msan_poison_alloca+0x15c/0x1d0
[   44.340557]  tcp_sendmsg+0xb2/0x100
[   44.344168]  ? tcp_sendmsg_locked+0x6cf0/0x6cf0
[   44.348817]  inet_sendmsg+0x48d/0x740
[   44.352596]  ? security_socket_sendmsg+0x9e/0x210
[   44.357416]  ? inet_getname+0x500/0x500
[   44.361371]  sock_write_iter+0x3b9/0x470
[   44.365413]  ? sock_read_iter+0x480/0x480
[   44.369543]  __vfs_write+0x7fb/0x9f0
[   44.373239]  vfs_write+0x463/0x8d0
[   44.376760]  SYSC_write+0x172/0x360
[   44.380366]  SyS_write+0x55/0x80
[   44.383711]  do_syscall_64+0x309/0x430
[   44.387577]  ? SYSC_read+0x360/0x360
[   44.391274]  entry_SYSCALL_64_after_hwframe+0x3d/0xa2
[   44.396447] RIP: 0033:0x7fe4b56f1370
[   44.400133] RSP: 002b:00007ffee8389268 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
[   44.407816] RAX: ffffffffffffffda RBX: 0000000000000138 RCX: 00007fe4b56f1370
[   44.415069] RDX: 0000000000000138 RSI: 000055ac2f0ae440 RDI: 0000000000000003
[   44.422324] RBP: 000055ac2f0ae440 R08: 000055ac2f0aa8f0 R09: 000055ac2e3f8820
[   44.429572] R10: 000000001c5d8954 R11: 0000000000000246 R12: 00007ffee83892cc
[   44.436827] R13: 0000000000000001 R14: 000055ac2f0b44a0 R15: 0000000000000000
[   44.444075] 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 
[   44.463161] RIP: kmsan_get_shadow_address+0x1ce/0x1f0 RSP: ffff8801bd7fe648
[   44.470239] ---[ end trace 66d96ac224411eea ]---
[   44.474967] Kernel panic - not syncing: Fatal exception in interrupt
[   44.481915] Dumping ftrace buffer:
[   44.485436]    (ftrace buffer empty)
[   44.489119] Kernel Offset: disabled
[   44.492720] Rebooting in 86400 seconds..