>Number: 153996
>Category: kern
>Synopsis: zfs root mount error while kernel is not located in
>/boot/kernel
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Fri Jan 14 21:00:20 UTC 2011
>Closed-Date:
>Last-Modified:
>Originator: alexander naumochkin
>Release: 8.2-PRERELEASE (SNAP-20110110) i386
>Organization:
>Environment:
FreeBSD zombie.prio.ru 8.2-PRERELEASE FreeBSD 8.2-PRERELEASE #0: Tue Jan 11
01:17:21 MSK 2011 r...@zombie.prio.ru:/usr/obj/usr/src/sys/GCAM i386
>Description:
If the kernel is not located in default directory (/boot/kernel), it fails to
mount zfs root during startup regardless of using
vfs.root.mountfrom="zfs:zroot" or /etc/fstab record.
I use FreeBSD on GPT ZFS Root.
[ash@zombie ~]$ gpart show
=> 34 156301421 ada0 GPT (75G)
34 128 1 freebsd-boot (64K)
162 3145728 2 freebsd-swap (1.5G)
3145890 153155565 3 freebsd-zfs (73G)
=> 34 156301421 ada1 GPT (75G)
34 128 1 freebsd-boot (64K)
162 3145728 2 freebsd-swap (1.5G)
3145890 153155565 3 freebsd-zfs (73G)
[ash@zombie ~]$ gpart show -l
=> 34 156301421 ada0 GPT (75G)
34 128 1 (null) (64K)
162 3145728 2 swap0 (1.5G)
3145890 153155565 3 disk0 (73G)
=> 34 156301421 ada1 GPT (75G)
34 128 1 (null) (64K)
162 3145728 2 swap1 (1.5G)
3145890 153155565 3 disk1 (73G)
[ash@zombie ~]$ zpool status
pool: zroot
state: ONLINE
scrub: none requested
config:
NAME STATE READ WRITE CKSUM
zroot ONLINE 0 0 0
mirror ONLINE 0 0 0
gpt/disk1 ONLINE 0 0 0
gpt/disk0 ONLINE 0 0 0
>How-To-Repeat:
#cd /usr/src
#make installkernel KODIR=/boot/GCAM
#shutdown -r now
Select 6 (loader prompt) from boot menu and enter:
OK unload kernel
OK load /boot/GCAM/kernel
OK set module_path=/boot/GCAM
OK load opensolaris
OK load zfs
OK boot
kernel starts, detects hardware, but at "Trying to mount root from zfs:zroot"
stops with "MOUNT ROOT ERROR:" Entering zfs:zroot at mountroot> prompt not
helps.
>Fix:
Boot from LiveCD, mount zroot, rename /boot/GCAM to /boot/kernel, reboot :)
>Release-Note:
>Audit-Trail:
>Unformatted:
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