FreeBSD 9 crash/deadlock when dump(8)ing file system with journaling enabled.

Jeremy Chadwick freebsd at
Fri Feb 3 09:24:03 UTC 2012

On Fri, Feb 03, 2012 at 06:45:58AM -0200, Marcel Bonnet wrote:
> Hi, what would be the best choice?
> 1. turn off SUJ and dump using -L flag and the turn it on again (but I'm
> affraid to destroy the system this way - is this possible?)
> 2. dump the unmounted partitions with a live cd, per example
> Sorry for top posting, mobile mail client problem.
> Em 30/01/2012 12:56, "Ivan Voras" <ivoras at>escreveu:
> On 30/01/2012 13:06, Jeremy Chadwick wrote:
> >> For now I've turned off journaling (soft updates see...
> It's a known bug: SU+J currently deadlocks when used with UFS snapshots.

Is there a reason you require use of dump(8) over, say, rsync/rsnapshot
or similar tools?

As far as disabling the journalling aspect of SU+J on-the-fly (meaning
on a mounted filesystem), I don't think this is possible, but I will
state boldly up front I have not messed around with 9.0 at all aside
from tinkering about in the installer.

| Jeremy Chadwick                                 jdc at |
| Parodius Networking            |
| UNIX Systems Administrator                 Mountain View, CA, US |
| Making life hard for others since 1977.             PGP 4BD6C0CB |

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