panic: ffs_blkfree: freeing free block

[Arjan van Leeuwen]

2007/10/19, Tim Bishop <tim-lists at bishnet.net>:
>
> 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).