Re: kern/40210: 5.0 BETA WAPBL related crash

[Andrew Doran <ad%netbsd.org@localhost>]

On Thu, Dec 18, 2008 at 09:43
:44AM +0100, Juraj Hercek wrote:
> Andrew Doran wrote:
> >The following reply was made to PR kern/40210; it has been noted by GNATS.
> >  
> [snip]
> > On Wed, Dec 17, 2008 at 04:45:00PM +0000, nbsd%hck.sk@localhost wrote:
> > 
> > > /local/mnt on /mnt type null (hidden, local)
> > > /dev/sd0p on /mnt/data type ffs (log, local)
> > ...
> > > ffs_full_fsync() at netbsd:ffs_full_fsync+0x3d1
> > > spec_fsync() at netbsd:spec_fsync+0x59
> > 
> > What type of file system is /dev on?
> >  
> It's tmpfs:
> 
> # mount | grep "\/dev "
> tmpfs on /dev type tmpfs (union, local)

Ok, this is the problem. ffs' VFS_FSYNC() is not working correctly for
WAPBL when ufsmount::um_devvp is not on an ffs file system.
 
> I'm just not sure why there's an union flag. Isn't union considered 
> experimental?

union mounts and unionfs are two different things. union mounts work well.
The union file system is a bag of spanners.

Thanks,
Andrew