[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[   34.364311] random: sshd: uninitialized urandom read (32 bytes read)
[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   38.088358] random: sshd: uninitialized urandom read (32 bytes read)
[   38.762713] random: sshd: uninitialized urandom read (32 bytes read)
[   39.981246] random: sshd: uninitialized urandom read (32 bytes read)
[   40.222437] random: sshd: uninitialized urandom read (32 bytes read)
[   45.699723] random: sshd: uninitialized urandom read (32 bytes read)
[   45.723059] Not allocated shadow for addr ffff8801d343c000 (page ffffea000af39680)
[   45.730819] Attempted to access 270 bytes
[   45.734970] ------------[ cut here ]------------
[   45.739703] kernel BUG at mm/kmsan/kmsan.c:1326!
[   45.744439] invalid opcode: 0000 [#1] SMP PTI
[   45.748908] Dumping ftrace buffer:
[   45.752422]    (ftrace buffer empty)
[   45.756107] Modules linked in:
[   45.759280] CPU: 0 PID: 4529 Comm: sshd Not tainted 4.17.0-rc3+ #88
[   45.765660] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   45.775010] RIP: 0010:kmsan_get_shadow_address+0x1ce/0x1f0
[   45.780618] RSP: 0018:ffff8801caa2e700 EFLAGS: 00010082
[   45.785957] RAX: 000000000000001d RBX: 0000000000000740 RCX: 0000000000000000
[   45.793203] RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000000
[   45.800449] RBP: ffff8801caa2e718 R08: 0000000000000000 R09: 0000000000000001
[   45.807696] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801d343c000
[   45.814950] R13: 000000000000010e R14: 0000000000000001 R15: 000000000000010e
[   45.822200] FS:  00007f8fc4bf77c0(0000) GS:ffff88021fc00000(0000) knlGS:0000000000000000
[   45.830405] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   45.836266] CR2: 00007f8fc404af70 CR3: 000000019a0e6000 CR4: 00000000001406f0
[   45.843529] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   45.850778] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   45.858028] Call Trace:
[   45.860612]  kmsan_internal_unpoison_shadow+0x5c/0xe0
[   45.865792]  kmsan_unpoison_shadow+0x66/0xb0
[   45.870188]  virtqueue_get_buf_ctx+0x742/0xa20
[   45.874754]  virtqueue_get_buf+0x72/0x90
[   45.878799]  start_xmit+0x293/0x29a0
[   45.882510]  ? packet_rcv+0x21a0/0x21a0
[   45.886477]  ? virtnet_close+0x2c0/0x2c0
[   45.890524]  dev_hard_start_xmit+0x5f1/0xc70
[   45.894918]  sch_direct_xmit+0x540/0x8f0
[   45.898964]  __qdisc_run+0x1785/0x3730
[   45.902838]  ? __msan_metadata_ptr_for_load_8+0x10/0x20
[   45.908182]  __dev_queue_xmit+0x1d50/0x3520
[   45.912490]  ? __msan_metadata_ptr_for_load_8+0x10/0x20
[   45.917836]  dev_queue_xmit+0x4b/0x60
[   45.921627]  ip_finish_output2+0x12a1/0x1470
[   45.926043]  ip_finish_output+0xcb2/0xff0
[   45.930182]  ip_output+0x505/0x5d0
[   45.933710]  ? ip_mc_finish_output+0x3b0/0x3b0
[   45.938274]  ? ip_finish_output+0xff0/0xff0
[   45.942575]  ip_queue_xmit+0x1a1e/0x1d10
[   45.946616]  ? __msan_metadata_ptr_for_store_1+0x13/0x20
[   45.952055]  ? __skb_clone+0x6ec/0x990
[   45.955925]  ? kmsan_set_origin+0x9e/0x160
[   45.960142]  ? ip_output+0x5d0/0x5d0
[   45.963844]  tcp_transmit_skb+0x3d81/0x53d0
[   45.968158]  tcp_write_xmit+0x2d71/0xb290
[   45.972299]  __tcp_push_pending_frames+0x124/0x3f0
[   45.977209]  tcp_push+0x8b6/0x9c0
[   45.980747]  tcp_sendmsg_locked+0x4e74/0x65a0
[   45.985232]  tcp_sendmsg+0xb2/0x100
[   45.988840]  ? tcp_sendmsg_locked+0x65a0/0x65a0
[   45.993488]  inet_sendmsg+0x48d/0x740
[   45.997274]  ? security_socket_sendmsg+0x91/0x1f0
[   46.002095]  ? inet_getname+0x4a0/0x4a0
[   46.006057]  sock_write_iter+0x3b9/0x470
[   46.010101]  ? sock_read_iter+0x480/0x480
[   46.014246]  __vfs_write+0x7fb/0x9f0
[   46.017942]  vfs_write+0x463/0x8d0
[   46.021463]  __x64_sys_write+0x1bf/0x3e0
[   46.025512]  do_syscall_64+0x154/0x220
[   46.029387]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[   46.034557] RIP: 0033:0x7f8fc2f92370
[   46.038244] RSP: 002b:00007ffc7c50b958 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
[   46.045928] RAX: ffffffffffffffda RBX: 0000000000000138 RCX: 00007f8fc2f92370
[   46.053174] RDX: 0000000000000138 RSI: 000055b9f296f440 RDI: 0000000000000003
[   46.060431] RBP: 000055b9f296f440 R08: 000055b9f296d240 R09: 000055b9f1068820
[   46.067676] R10: 00000000932db601 R11: 0000000000000246 R12: 00007ffc7c50b9bc
[   46.074931] R13: 0000000000000001 R14: 000055b9f29754a0 R15: 0000000000000000
[   46.082185] Code: 75 29 48 c7 c7 84 fe 9f 8a 31 c0 e8 4d 2a 83 ff 80 3c 25 f8 73 53 8b 00 75 11 48 c7 c7 b4 fe 9f 8a 31 c0 4c 89 fe e8 32 2a 83 ff <0f> 0b eb fe 48 3d ff ff ff 1f 0f 87 a2 fe ff ff 48 8b 1c 25 10 
[   46.101272] RIP: kmsan_get_shadow_address+0x1ce/0x1f0 RSP: ffff8801caa2e700
[   46.108358] ---[ end trace 9afdf148cc85e8d6 ]---
[   46.113090] Kernel panic - not syncing: Fatal exception in interrupt
[   46.120161] Dumping ftrace buffer:
[   46.123691]    (ftrace buffer empty)
[   46.127384] Kernel Offset: disabled
[   46.130992] Rebooting in 86400 seconds..