zroot won't mount after 9.0-RC2 -> 9.0-RELEASE upgrade

[Daniel Shahaf]

George Kontostanos wrote on Wed, Feb 15, 2012 at 17:35:35 +0200:
> Try loading geom_part_gpt.ko to see if it helps.
> 

Thanks for the suggestion.  I've tried:

unload
load /boot/testkernel/kernel
load /boot/testkernel/geom_part_gpt.ko
load /boot/testkernel/zfs.ko
load /boot/testkernel/accf_data.ko
load /boot/testkernel/accf_http.ko
load /boot/testkernel/ipmi.ko

The symptoms are unchanged, except that this time a backtrace was given:

#2 0xffffffff808c1bda at vfs_mountroot+0x1d7a
#3 ...                at start_init+0x4c

Still looking into the other suggestions.