Date: Fri, 18 Jan 2008 12:09:18 +0100 From: "Daniel Eriksson" <daniel_k_eriksson@telia.com> To: <freebsd-stable@freebsd.org> Cc: pjd@FreeBSD.org Subject: RE: Multiple ZFS pools = panic on shutdown? Message-ID: <4F9C9299A10AE74E89EA580D14AA10A61A189A@royal64.emp.zapto.org> In-Reply-To: <4F9C9299A10AE74E89EA580D14AA10A61A1899@royal64.emp.zapto.org>
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I wrote:
> Has anyone heard of or experienced any panics ("vput:
> negative ref cnt" or "vrele: negative ref cnt") when
> shutting down a box with more than one zpool?
After doing some testing I've come up with the following simple steps to
recreate the panic:
1. Create the pools and then export them
2. Reboot the computer
3. Import the pools, touch some files on them and then export them again
4. Reboot again -> BOOM!
Create the pools
----------------
dd if=/dev/zero of=/usr/_disk1 bs=1m count=128
dd if=/dev/zero of=/usr/_disk2 bs=1m count=128
dd if=/dev/zero of=/usr/_disk3 bs=1m count=128
dd if=/dev/zero of=/usr/_disk4 bs=1m count=128
mdconfig -f /usr/_disk1 -u 1
mdconfig -f /usr/_disk2 -u 2
mdconfig -f /usr/_disk3 -u 3
mdconfig -f /usr/_disk4 -u 4
/etc/rc.d/zfs forcestart
zpool create tank1 mirror md1 md2
zpool create tank2 mirror md3 md4
touch /tank1/testfile
touch /tank2/testfile
zpool export tank1
zpool export tank2
/etc/rc.d/zfs forcestop
mdconfig -d -u 1
mdconfig -d -u 2
mdconfig -d -u 3
mdconfig -d -u 4
Import the pools
----------------
mdconfig -f /usr/_disk1 -u 1
mdconfig -f /usr/_disk2 -u 2
mdconfig -f /usr/_disk3 -u 3
mdconfig -f /usr/_disk4 -u 4
/etc/rc.d/zfs forcestart
zpool import tank1
zpool import tank2
touch /tank1/testfile
touch /tank2/testfile
zpool export tank1
zpool export tank2
/etc/rc.d/zfs forcestop
mdconfig -d -u 1
mdconfig -d -u 2
mdconfig -d -u 3
mdconfig -d -u 4
/Daniel Eriksson
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