[Bug 247696] Boot fails when attempting to mount with gmirror disk from different o/s release

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=247696

--- Comment #2 from Barry Friedman <bfriedman at emax.ca> ---
In case it wasn't clear the intent was to use the spare disk rebuilt on 10.4 to
mirror the 12.1 system disk.  I only have 3 X 2 tb disks and no longer need to
support the 10.4 system with a mirror.

What I observed is that it's not possible to successfully boot the 12.1 system
which has a status of 
> gmirror status
      Name    Status  Components
mirror/gm0  COMPLETE  ada0 (ACTIVE)

When only the system disk is connected and the system boots as normal.

With the 10.1 disk connected it boots but I cannot login due to errors of 

 "init getting kqueues resource limit: Invalid argument" messages. and the
system returns to the login prompt.  

I want to break the mirror on 12.1 which carried over the gmirror status of the
disk that had been taken from the 10.4 system at the start of this process
and rebuild it with the spare disk from 10.4.
I had thought that I could simply gmirror insert the disk as after a failure.

Looking over the report I sent I can't be sure whether I did a gmirror forget
or gmirror remove.  In any case the 10.1 system  shows the same gmirror status
as above.

Any advice would be appreciated.

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