GEOM too restrictive even with debugflags=16

[Emanuel Strobl]

Hello,

again I ran into the problem that I need to edit my GPT while the system is 
in multiuser running. But the following doesn't work:
cale:/#70: sysctl -w kern.geom.debugflags=16
kern.geom.debugflags: 0 -> 16
cale:/#71: gpt remove -i 8 ad0s2
gpt remove: unable to open device 'ad0s2': Operation not permitted

Arrghhh. Now I have to stop all work and go into singleuser mode. Thats not 
acceptable! And please don't tell me that I use the wrong device, it's a 
i386 machine so I need a MBR in ad0 and have to use GPT inside a slice!

What sense does it make to forbid such modifications? Especially if I 
enable foot-shooting?!

I'd love to test a patch, I can't tell how angry I am that I have to shut 
down the box!

-Harry
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