[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[   29.135778] random: sshd: uninitialized urandom read (32 bytes read)
[?25l[?1c7[ ok 8[?25h[?0c.
[   30.422694] random: sshd: uninitialized urandom read (32 bytes read)

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   30.899363] random: sshd: uninitialized urandom read (32 bytes read)
[   32.029465] random: sshd: uninitialized urandom read (32 bytes read)
[   93.580181] random: sshd: uninitialized urandom read (32 bytes read)
[   99.000792] random: sshd: uninitialized urandom read (32 bytes read)
[   99.023389] Not allocated shadow for addr ffff8801d3a18000 (page ffffea000af5c900)
[   99.031706] Attempted to access 782 bytes
[   99.036524] ------------[ cut here ]------------
[   99.041610] kernel BUG at mm/kmsan/kmsan.c:1344!
[   99.046389] invalid opcode: 0000 [#1] SMP PTI
[   99.050891] Dumping ftrace buffer:
[   99.054427]    (ftrace buffer empty)
[   99.058234] Modules linked in:
[   99.062122] CPU: 1 PID: 4468 Comm: sshd Not tainted 4.17.0-rc5+ #102
[   99.069359] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   99.079516] RIP: 0010:kmsan_get_shadow_address+0x1ce/0x1f0
[   99.085208] RSP: 0018:ffff8801a5d7e6f0 EFLAGS: 00010082
[   99.090553] RAX: 000000000000001d RBX: 0000000000000740 RCX: 0000000000000000
[   99.097803] RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000000
[   99.105054] RBP: ffff8801a5d7e708 R08: 0000000000000000 R09: 0000000000000001
[   99.112331] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801d3a18000
[   99.119591] R13: 000000000000030e R14: 0000000000000001 R15: 000000000000030e
[   99.127281] FS:  00007fc009c7c7c0(0000) GS:ffff88021fd00000(0000) knlGS:0000000000000000
[   99.135835] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   99.141814] CR2: 00007fc0090c1100 CR3: 00000001966a8000 CR4: 00000000001406e0
[   99.149086] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   99.156452] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   99.163878] Call Trace:
[   99.166453]  kmsan_internal_unpoison_shadow+0x5c/0xe0
[   99.171623]  kmsan_unpoison_shadow+0x66/0xb0
[   99.176029]  virtqueue_get_buf_ctx+0x73f/0xa20
[   99.180694]  virtqueue_get_buf+0x72/0x90
[   99.184736]  start_xmit+0x293/0x29b0
[   99.188437]  ? packet_rcv+0x21a0/0x21a0
[   99.192395]  ? virtnet_close+0x2c0/0x2c0
[   99.196435]  dev_hard_start_xmit+0x5f1/0xc70
[   99.200828]  sch_direct_xmit+0x578/0x8f0
[   99.205511]  __qdisc_run+0x1785/0x3730
[   99.209633]  __dev_queue_xmit+0x1d50/0x3510
[   99.214983]  dev_queue_xmit+0x4b/0x60
[   99.218767]  ip_finish_output2+0x12bf/0x1490
[   99.223256]  ip_finish_output+0xcaf/0xff0
[   99.227388]  ip_output+0x505/0x5d0
[   99.230909]  ? ip_mc_finish_output+0x3b0/0x3b0
[   99.235473]  ? ip_finish_output+0xff0/0xff0
[   99.239773]  ip_queue_xmit+0x1a1d/0x1d10
[   99.243843]  ? __msan_metadata_ptr_for_store_1+0x13/0x20
[   99.249279]  ? __skb_clone+0x6ec/0x990
[   99.253160]  ? kmsan_set_origin+0x9e/0x160
[   99.257385]  ? ip_output+0x5d0/0x5d0
[   99.261082]  tcp_transmit_skb+0x3d6d/0x53b0
[   99.265387]  tcp_write_xmit+0x2d71/0xb1f0
[   99.269536]  __tcp_push_pending_frames+0x124/0x400
[   99.274446]  tcp_push+0x803/0x8f0
[   99.277883]  tcp_sendmsg_locked+0x4eb1/0x6610
[   99.282366]  tcp_sendmsg+0xb2/0x100
[   99.285973]  ? tcp_sendmsg_locked+0x6610/0x6610
[   99.290623]  inet_sendmsg+0x3f7/0x750
[   99.294403]  ? __msan_metadata_ptr_for_load_8+0x10/0x20
[   99.299746]  ? inet_getname+0x4a0/0x4a0
[   99.303698]  sock_write_iter+0x3b7/0x470
[   99.307739]  ? sock_read_iter+0x480/0x480
[   99.311884]  __vfs_write+0x7fb/0x9f0
[   99.315717]  vfs_write+0x467/0x8c0
[   99.319239]  __x64_sys_write+0x1bf/0x3e0
[   99.323291]  do_syscall_64+0x152/0x230
[   99.327161]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[   99.333191] RIP: 0033:0x7fc008017370
[   99.336894] RSP: 002b:00007ffd1194f6a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
[   99.344866] RAX: ffffffffffffffda RBX: 0000000000000138 RCX: 00007fc008017370
[   99.352239] RDX: 0000000000000138 RSI: 000055858e8c4430 RDI: 0000000000000003
[   99.359920] RBP: 000055858e8c4430 R08: 000055858e8c3270 R09: 000055858de12820
[   99.367183] R10: 00000000fc592566 R11: 0000000000000246 R12: 00007ffd1194f70c
[   99.374790] R13: 0000000000000001 R14: 000055858e8ca490 R15: 0000000000000000
[   99.382138] Code: 75 29 48 c7 c7 83 00 a0 8a 31 c0 e8 7d 14 83 ff 80 3c 25 f8 73 53 8b 00 75 11 48 c7 c7 b3 00 a0 8a 31 c0 4c 89 fe e8 62 14 83 ff <0f> 0b eb fe 48 3d ff ff ff 1f 0f 87 a2 fe ff ff 48 8b 1c 25 10 
[   99.401240] RIP: kmsan_get_shadow_address+0x1ce/0x1f0 RSP: ffff8801a5d7e6f0
[   99.408426] ---[ end trace 311841da36f2ab36 ]---
[   99.413154] Kernel panic - not syncing: Fatal exception in interrupt
[   99.420256] Dumping ftrace buffer:
[   99.423797]    (ftrace buffer empty)
[   99.427765] Kernel Offset: disabled
[   99.431369] Rebooting in 86400 seconds..