zpool create on md hangs
andrnils at gmail.com
Mon Nov 10 06:48:14 UTC 2014
On Mon, Nov 10, 2014 at 7:37 AM, Curtis Villamizar <curtis at ipv6.occnc.com>
> The following shell program produces a hang. Its reproducible (hangs
> every time).
> set -e
> set -x
> truncate -s `expr 10 \* 1024 \* 1024 \* 1024` /image-file
> md_unit=`mdconfig -a -n -t vnode -f /image-file`
> echo "md device is /dev/md$md_unit"
> zpool create test md$md_unit
> The zpool command hangs. Kill or kill -9 has no effect. All
> filesystems are unaffected but any other zpool or zfs command will
> hang and be unkillable. A reboot is needed.
> This is running on:
> FreeBSD 10.0-STABLE (GENERIC) #0 r270645: Wed Aug 27 00:54:29 EDT 2014
> When I get a chance, I will try again with a 10.1 RC3 kernel I
> recently built. If this still doesn't work, I'll build an r11 kernel
> since the code differs from 10.1, not having the svm code merged in.
> I'm asking before poking around further in case anyone has insights
> into why this might happen.
> BTW- The reason to create a zfs filesystem on an vnode type md is to
> create an image that can run under bhyve using a zfs root fs. This
> works quite nicely for combinations geom types (gmirror, gstripe,
> gjournal, gcache) but zpool hangs when trying this with zfs.
> ps- please keep me on the Cc as I'm not subscribed to freebsd-fs.
Freezes here on 10.1-RC2-p1 (amd64) as well.
load: 0.21 cmd: zpool 74063 [zio->io_cv] 8.84r 0.00u 0.00s 0% 3368k
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