ZFS on root booting broken somewhere after r270020

[Kimmo Paasiala]

> On 9.9.2014, at 19.03, Kimmo Paasiala <kpaasial at icloud.com> wrote:
> 
> 
>> On 9.9.2014, at 18.53, Steven Hartland <killing at multiplay.co.uk> wrote:
>> 
>> ----- Original Message ----- From: "Kimmo Paasiala" <kpaasial at icloud.com>
>>> Hi it’s me again. Something that was committed in stable/10 after r271213 up to
>>> and including r271288 broke ZFS on Root booting in exactly the same way again.
>>> I know the problem is no longer related to extra kernel modules loaded in
>>> /boot/loader.conf because I’m loading only the required zfs.ko and opensolaris.ko
>>> modules. Also, the new vt(4) console that I’m using is not the culprit because the
>>> same thing happens with kern.vty set to “sc”.
>> 
>> I've just updated my stable/10 box to r271316 and no problems booting from a ZFS root.
>> 
>> So first things first what error are you seeing?
>> 
>> Next what is you're:
>> * Hardware
>> * Pool layout
>> 
>>  Regards
>>  Steve 
> 
> The error is the same as before:
> 
> 	• Mounting from zfs:rdnzltank/ROOT/default failed with error 5.
> 
> Followed by the mountroot prompt and I get only these devices to choose from, no sign of the ZFS pool:
> 
> 	• mountroot>
> 	• List of GEOM managed disk devices:
> 	•   gpt/fb10disk1 gpt/fb10swap1 diskid/DISK-S13UJDWS301624p3 diskid/DISK-S13UJDWS301624p2 diskid/DISK-S13UJDWS301624p1 ada0p3 ada0p2 ada0p1 diskid/DISK-S13UJDWS301624 ada0
> 
> Hardware is a Gigabyte GA-D510UD Mini-ITX motherboard:
> 
> http://www.gigabyte.com/products/product-page.aspx?pid=3343#ov
> 
> 4GBs of RAM. One 750GB Samsung HD753LJ 3.5” SATA HD on the Intel SATA controller.
> 
> Pool layout:
> 
> pool: rdnzltank
> state: ONLINE
>  scan: scrub repaired 0 in 1h7m with 0 errors on Wed Aug 20 09:27:48 2014
> config:
> 
>        NAME             STATE     READ WRITE CKSUM
>        rdnzltank        ONLINE       0     0     0
>          gpt/fb10disk1  ONLINE       0     0     0
> 
> errors: No known data errors
> 
> Output of ‘gpart show’:
> 
> freebsd10 ~ % gpart show    
> =>        34  1465146988  ada0  GPT  (699G)
>          34        2014        - free -  (1.0M)
>        2048        1024     1  freebsd-boot  (512K)
>        3072        1024        - free -  (512K)
>        4096    16777216     2  freebsd-swap  (8.0G)
>    16781312  1448365710     3  freebsd-zfs  (691G)
> 
> 
> HTH,
> 
> -Kimmo


More information. This version still works:

FreeBSD freebsd10.rdnzl.info 10.1-PRERELEASE FreeBSD 10.1-PRERELEASE #0 r271237: Wed Sep 10 11:00:15 EEST 2014     root at buildstable10amd64.rdnzl.info:/usr/obj/usr/src/sys/GENERIC  amd64

The next higher version r271238 breaks booting for me. The commit in question is this one:

http://svnweb.freebsd.org/base?view=revision&sortby=rev&sortdir=down&revision=271238

-Kimmo