FS hang when creating snapshots on a UFS SU+J setup
Yamagi Burmeister
lists at yamagi.org
Tue Jan 3 09:26:26 UTC 2012
Hi,
I've seen this too (and other problems with SU+J and snapshots) and was
able to reproduce it fairly easy. I wrote a PR:
http://www.freebsd.org/cgi/query-pr.cgi?pr=163310
Never received any feedback until now...
On Mon, 2 Jan 2012 23:27:57 -0600
Bryce Edwards <bryce at bryce.net> wrote:
> I have a RELENG_9 machine that hangs when a snapshot is created on the
> root fs (UFS, with SU+J). More accurately, all the processes show a
> state of "suspfs" (with ^T) and no fs activity is completed from then
> on. A hard reboot (power cycle) was the only way to proceed.
>
> Here's some reference info - let me know what else I should provide.
>
> $uname -a
> FreeBSD xxx.xxx.net 9.0-PRERELEASE FreeBSD 9.0-PRERELEASE #0: Sun Dec
> 25 05:04:37 UTC 2011 root at xxx.xxx.net:/usr/obj/usr/src/sys/GENERIC
> amd64
>
> csup was run just before build[world|kernel] so you have reference on
> the version information.
>
> $mount
> /dev/gpt/root on / (ufs, local, journaled soft-updates)
> devfs on /dev (devfs, local, multilabel)
> linprocfs on /compat/linux/proc (linprocfs, local)
> { zfs info removed }
>
> $df -h
> Filesystem Size Used Avail Capacity Mounted on
> /dev/gpt/root 454G 9.1G 409G 2% /
> devfs 1.0k 1.0k 0B 100% /dev
> linprocfs 4.0k 4.0k 0B 100% /compat/linux/proc
> { zfs info removed }
>
> After the hard reset, there was a snapshot file listed in /.snap and
> it was ~465 GB, iirc. Unfortunately, I needed to get things going
> again so I was not able to debug or diagnose further. I may be able
> to schedule a time that I could recreate the issue and diagnose
> better, but I wanted to get your input on what data points and/or
> command you would be interested in.
>
> Thanks in advance,
>
> Bryce
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