Greetings,

I find that when running

        qemu-system-x86_64 -cpu qemu64,+smep,+smap

Some kernels will 100% produce this error, where the error code
-13,-14 are -EACCES and -EFAULT:

[   30.071380] Starting init: /sbin/init exists but couldn't execute it (error -14)
[   30.072073] Starting init: /etc/init exists but couldn't execute it (error -13)
[   30.073669] Starting init: /bin/sh exists but couldn't execute it (error -14)
[   30.074147] Kernel panic - not syncing: No working init found.  Try passing init= option to kernel. See Linux Documentation/init.txt for guidance.
[   30.074147] CPU: 0 PID: 1 Comm: init Not tainted 3.14.0-rc1-next-20140207-01715-g72569d9 #1
[   30.074147]  0000000000000000 ffff88000e065ec0 ffffffff815774ce ffff88000e065f38
[   30.074147]  ffffffff81575037 0000000000000008 ffff88000e065f48 ffff88000e065ee8
[   30.074147]  ffffffff81869e04 0000000000000001 ffff88000e062010 0000000000000000
[   30.074147] Call Trace:
[   30.074147]  [<ffffffff815774ce>] dump_stack+0x19/0x1b
[   30.074147]  [<ffffffff81575037>] panic+0xd0/0x1d1
[   30.074147]  [<ffffffff8156d6f5>] ? rest_init+0x139/0x139
[   30.074147]  [<ffffffff8156d7cb>] kernel_init+0xd6/0xda
[   30.074147]  [<ffffffff81585f0a>] ret_from_fork+0x7a/0xb0
[   30.074147]  [<ffffffff8156d6f5>] ? rest_init+0x139/0x139
[   30.074147] Kernel Offset: 0x0 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffff9fffffff)

Any ideas?

Thanks,
Fengguang