ZFS on root booting broken somewhere after r270020

[Kimmo Paasiala]

On 19.8.2014, at 10.10, Konstantin Belousov <kostikbel at gmail.com> wrote:

> On Tue, Aug 19, 2014 at 07:40:46AM +0300, Kimmo Paasiala wrote:
>> 
>> On 18.8.2014, at 8.54, Kimmo Paasiala <kpaasial at icloud.com> wrote:
>> 
>>> 
>>> On 18.8.2014, at 2.32, Kimmo Paasiala <kpaasial at icloud.com> wrote:
>>> 
>>>> System is:
>>>> 
>>>> FreeBSD freebsd10.rdnzl.info 10.0-STABLE FreeBSD 10.0-STABLE #2 r270020: Fri Aug 15 20:38:59 EEST 2014     kimmo at buildstable10amd64.rdnzl.info:/usr/obj/usr/src/sys/GENERIC  amd64
>>>> 
>>>> This version still works fine. The one that didn?t work was r270097. The kernel boots but gets stuck at the line:
>>>> 
>>>> Trying to mount root from zfs:pool/ROOT/default []
>>>> 
>>>> I tried pressing enter at this point but got a panic, I don?t have a screenshot of the panic at the moment.
>>>> 
>>>> Could this problem be related the this commit? :
>>>> 
>>>> http://svnweb.freebsd.org/base?view=revision&sortby=rev&sortdir=down&revision=270095
>>>> 
>>>> -Kimmo
>>> 
>>> Trying to bisect this I backed to r270050 and that version still works. More to come.
>>> 
>>> -Kimmo
>> 
>> Version r270094 still works but commit r270095 definitely does break booting from ZFS on root on my system. The error message I see on the console is  ?Mounting from <the ZFS filesystem> failed with error 5? and I?m given the mountroot prompt. I don?t see the ZFS pool among the listed GEOM devices on the mountroot prompt.
>> 
>> Adding the committer of r270095 (kib@) to this discussion.
> 
> I have no idea about ZFS, but the fact that things, which are lower-level
> than ZFS filesystem itself are missing, suggests that the issue is unrelated.
> At the very least, start with providing the verbose boot dmesg for successful
> and failed boots.

This looks like to be unrelated to ZFS as you’re saying. I just remembered that I’m loading fuse.ko in my /boot/loader.conf. I commented that one out and what do you know? The system boots fine with the r270095 kernel.

Very very strange… 

Thanks for the input anyway,

-Kimmo



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