RELENG_8: ufs: "ROOT MOUNT ERROR"

[grarpamp]

Adding some info...

> On an i386 GENERIC ...
> RELENG_8 from this week fails to mount root.

The above means svn 265062.

I have verbose dmesg from both if need be.
I've only briefly compared them so far.


> gpart show ad0
> =>      63  17803377  ad0  MBR  (8.5G)
>         63   6421905    1  freebsd  [active]  (3.1G)
>    6421968  11381328    2  freebsd  (5.4G)
>   17803296       144       - free -  (72k)
>
> *** ad0s2 is actually part of a zpool now. I don't think there is
> a proper slice type for that, and I couldn't find any list in fdisk.c
> or /usr/include. I thought that might cause a tasting issue but I
> checked and the first 8k of ad0s2 is all zero's.

boot0cfg -v ad0
#   flag     start chs   type       end chs       offset         size
1   0x80      0:  1: 1   0xa5   1023: 15:63           63      6421905
2   0x00   1023:255:63   0xa5   1023: 15:63      6421968     11381328
version=2.0  drive=0x80  mask=0xf  ticks=182  bell=# (0x23)
options=packet,update,nosetdrv
volume serial ID 0000-808f
default_selection=F1 (Slice 1)


fdisk ad0
******* Working on device /dev/ad0 *******
parameters extracted from in-core disklabel are:
cylinders=17662 heads=16 sectors/track=63 (1008 blks/cyl)
Figures below won't work with BIOS for partitions not in cyl 1
parameters to be used for BIOS calculations are:
cylinders=17662 heads=16 sectors/track=63 (1008 blks/cyl)
Media sector size is 512
Warning: BIOS sector numbering starts with sector 1
Information from DOS bootblock is:
The data for partition 1 is:
sysid 165 (0xa5),(FreeBSD/NetBSD/386BSD)
    start 63, size 6421905 (3135 Meg), flag 80 (active)
        beg: cyl 0/ head 1/ sector 1;
        end: cyl 1023/ head 15/ sector 63
The data for partition 2 is:
sysid 165 (0xa5),(FreeBSD/NetBSD/386BSD)
    start 6421968, size 11381328 (5557 Meg), flag 0
        beg: cyl 1023/ head 255/ sector 63;
        end: cyl 1023/ head 15/ sector 63
The data for partition 3 is:
<UNUSED>
The data for partition 4 is:
<UNUSED>