ZFS on root booting broken somewhere after r270020

[Konstantin Belousov]

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.
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