panic: ffs_blkfree: freeing free block

Ken Smith kensmith at cse.Buffalo.EDU
Wed Nov 7 09:38:37 PST 2007

On Tue, 2007-10-23 at 11:35 +0200, Arjan van Leeuwen wrote:
> 2007/10/19, Tim Bishop <tim-lists at>:
> >
> > On Thu, Oct 18, 2007 at 06:40:04PM +0200, Arjan van Leeuwen wrote:
> > > > are softupdates on ?
> > > >
> > > > Yes. Turning them off seems to fix the problem (fingers crossed - I
> > only
> > > > turned it off this morning, didn't have a panic yet)
> > >
> > > After working for a whole day without softupdates, I can say that
> > turning
> > > them off at least causes less panics to happen than with them turned on,
> > > maybe they even don't happen at all without softupdates; I haven't had a
> > > panic all day, while I have one every few hours with softupdates turned
> > on.
> >
> > I've been running for the best part of a day now with softupdates turned
> > off and so far no panics. I'm running tinderbox on the host, and it
> > would quite reliably crash it before.
> >
> > Of course it's hard to say if this has fixed the problem... maybe it
> > doesn't happen as often, or maybe my data is being slowly chewed up
> > instead ;-)
> It looks like on the same system, I'm able to reliably panic zfs as well,
> under the exact same conditions (i.e. linking a particularly big piece of
> software). Maybe this is not a problem in the filesystem at all. I've not
> been able to get a coredump yet from the zfs panic.
> This is in 7.0-PRERELEASE, btw (I switched to RELENG_7 when the branching
> happened).

Is anyone who had been able to trigger this panic still having problems
with recent kernels (and soft updates turned on)?  I've checked with a
few people who had been experiencing the panic and they can no longer
trigger it.

It's at least a tiny bit possible some of the VM fixes that have gone in
addressed this problem.  We'd like to find out if anyone can still
trigger this.


                                                Ken Smith
- From there to here, from here to      |       kensmith at
  there, funny things are everywhere.   |
                      - Theodore Geisel |

-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: application/pgp-signature
Size: 187 bytes
Desc: This is a digitally signed message part
Url :

More information about the freebsd-current mailing list