Cannot setup dumpdev on glabel disk

[Mark Johnston]

On Fri, Aug 31, 2018 at 10:08:20AM -0600, Samuel Chow wrote:
> I am running 11-STABLE, and I am experiencing kernel panics when I am 
> destroying a VIMAGE-based jail. Naturally, I flipped to the chapter 
> about 'Kernel Debugging' to learn about 'Obtaining a Kernel Crash Dump'.
> 
> However, I am finding that my permanently glabel'ed disk partition 
> cannot be used as dumpdev. Is that true, and why not? I mean, swap can 
> use it just fine. I am unable to find this restriction in the documentation.

I don't think that there is a real reason for this restriction; the
glabel GEOM class simply doesn't implement the required support.

Do you mind submitting a PR for this at
https://bugs.freebsd.org/bugzilla/ ? I will try and get that fixed soon
if no one else beats me to it.

> # grep swap /etc/fstab
> /dev/label/boot01b      none         swap       sw      0 0
> # swapinfo
> Device          1K-blocks     Used    Avail Capacity
> /dev/label/boot01b  41943040        0 41943040     0%
> # glabel status | grep boot
>    label/boot01     N/A  ada4s1
>    label/boot02     N/A  ada5s1
> # dumpon /dev/label/boot01b
> dumpon: ioctl(DIOCSKERNELDUMP): Operation not supported by device
> 
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