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Re: kern/51079: Accessing unconfigured cgd causes panic

The following reply was made to PR kern/51079; it has been noted by GNATS.

From: John Klos <>
Subject: Re: kern/51079: Accessing unconfigured cgd causes panic
Date: Wed, 20 Apr 2016 23:44:37 +0000 (UTC)

 More information:
 This doesn't happen with a properly configured cgd. I get "DIOCGDINFO: 
 Device not configured". So this only happens when you disklabel a device 
 and put the first 4.2BSD partition at the beginning of a disk instead of 
 32 blocks (or however many - don't know what the threshold is) away from 
 the beginning. After running cgdconfig, attempts to access the cgd give a 
 write error. After running cgdconfig -u and trying to access the cgd, the 
 machine panics.
 It might be worth mentioning in the documentation that full disk 
 encryption can't be used by specifying a disklabel slice which covers the 
 whole disk.

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