Re: kern/40210: 5.0 BETA WAPBL related crash

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

The following reply was made to PR kern/40210; it has been noted by GNATS.

From: Andrew Doran <ad%netbsd.org@localhost>
To: Juraj Hercek <nbsd%hck.sk@localhost>
Cc: gnats-bugs%NetBSD.org@localhost, kern-bug-people%netbsd.org@localhost,
        gnats-admin%netbsd.org@localhost, netbsd-bugs%netbsd.org@localhost
Subject: Re: kern/40210: 5.0 BETA WAPBL related crash
Date: Fri, 19 Dec 2008 10:43:31 +0000

 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