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

[Ivan Voras]

On 30/01/2012 13:06, Jeremy Chadwick wrote:

>> For now I've turned off journaling (soft updates seem fine) and that
>> works around the issue.
>>
>> Let me know if I can provide more details etc!
>
> I'm not sure, but this may be an after-effect of known problems right
> now with SU+J on 9.0.  It would help if you could state if you're using
> "dump -L" or not.
>
> I've seen the "deadlock" behaviour you describe on older FreeBSD
> versions (dating back to at least 7.x) when using "dump -L", which
> generates a fs snapshot.  Obviously 7.x does not have SU+J, so I'm a
> little surprised disabling journalling fixes the problem for you.

It's a known bug: SU+J currently deadlocks when used with UFS snapshots.