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From: Walter Hurry <walterhurry@gmail.com>
Subject: 9.2-RC1: Problem with Kernel
Date: Sat, 10 Aug 2013 19:04:29 +0000 (UTC)
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This is 9.2-RC1 on amd64 (upgraded from 9.2-BETA1 by refetching the 
source from releng/9.2 and rebuilding kernel and world).

The kernel compiles and runs fine using the supplied GENERIC, but when I 
try to use my custom kenel config file, on reboot I get this:

Mounting from ufs:/dev/ada0p2 failed with error 19

What module(s) have I missed?

Thanks.