[Bug 201679] Upgrade of -STABLE from 20150627 to 20150717 keeps loader from loading vmm.ko

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=201679

            Bug ID: 201679
           Summary: Upgrade of -STABLE from 20150627 to 20150717 keeps
                    loader from loading vmm.ko
           Product: Base System
           Version: 10.2-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: hartzell at alerce.com

I upgraded my 10.2-STABLE system via svn last night, did the build and install
world and kernel dance.  Generally everything is as it should be.

But, I can no longer load `vmm.ko` via the loader, which used to work.

I have these lines in `/boot/loader.conf`:

```
vmm_load="YES"
pptdevs="0/23/0"
```

and/but at the machine boots, I get this on the console.

```
>> FreeBSD EFI boot block
   Loader path: /boot/loader.efi
Consoles: EFI console  
Image base: 0x78a69000
EFI version: 2.40
EFI Firmware: EDK II (rev 1.00)

FreeBSD/amd64 EFI loader, Revision 1.1
(root at fishy.alerce.com, Sat Jul 18 00:42:15 PDT 2015)
Loading /boot/defaults/loader.conf
/boot/kernel/kernel text=0x1396e50 data=0x132738+0x4d7f40
syms=[0x8+0x159d50+0x8
+0x17465c]
/boot/entropy size=0x1000
/boot/kernel/vmm.ko |
elf64_obj_loadimage: read failed


Hit [Enter] to boot immediately, or any other key for command prompt.
Booting [/boot/kernel/kernel]...               
Start @ 0xffffffff802f9000 ...
```

I am unable to load them by hand via the loader either:

```
OK 
OK load vmm
/boot/kernel/vmm.ko -
elf64_obj_loadimage: read failed

can't load file '/boot/kernel/vmm.ko': input/output error
OK 
```

Loading `/boot/kernel.old/vmm.ko` (from the old build) also fails.

I can load the module using `kldload` once the system is up and running.  

I also noticed that the `if_urtwn.ko` module loaded via the loader, so I think
that loading kernel modules is not generally broken.

```
root at fishy:~ # kldload vmm
root at fishy:~ # kldstat
Id Refs Address            Size     Name
 1    9 0xffffffff80200000 1e6fa38  kernel
 2    1 0xffffffff82211000 11f42    if_urtwn.ko
 3    1 0xffffffff82223000 338ac2   vmm.ko
root at fishy:~ # 
```

I'd like to get this working.  Suggestions?

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