Date: Mon, 10 Nov 2014 07:48:10 +0100 From: Andreas Nilsson <andrnils@gmail.com> To: curtis@ipv6.occnc.com Cc: "freebsd-fs@freebsd.org" <freebsd-fs@freebsd.org> Subject: Re: zpool create on md hangs Message-ID: <CAPS9%2BSvm32uX23tUQfismQ%2B1_aiQDe1gyHWQ_BneWSV-cSRhow@mail.gmail.com> In-Reply-To: <201411100637.sAA6bJnR051011@maildrop31.somerville.occnc.com> References: <201411100637.sAA6bJnR051011@maildrop31.somerville.occnc.com>
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On Mon, Nov 10, 2014 at 7:37 AM, Curtis Villamizar <curtis@ipv6.occnc.com> wrote: > The following shell program produces a hang. Its reproducible (hangs > every time). > > #!sh > > 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. > > Curtis > > 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. ^T says: load: 0.21 cmd: zpool 74063 [zio->io_cv] 8.84r 0.00u 0.00s 0% 3368k Best regards Andreas
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