Re: 5.2-BETA: giving up on 4 buffers (ata)

On Sat, Dec 06, 2003 at 10:47:46AM +0100, Arjan van Leeuwen wrote:
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> On Saturday 06 December 2003 05:33, Bruce Evans wrote:
> > On Fri, 5 Dec 2003, Arjan van Leeuwen wrote:
> > > > On Thursday 27 November 2003 10:43, Stefan Ehmann wrote:
> > > > > This is a known problem for nearly three months now (See PR 56675).
> > > > > It happens to me every time I shut down the system if i don't unmount
> > > > > my (read-only) ext2 file systems manually.
> > >
> > > FYI, I'm still seeing this problem on a -CURRENT system from today. Is
> > > there any way I can help to diagnose the cause of this problem? Is there
> > > already a fix available somewhere?
> >
> > No need.  It was diagnosed over 3 months ago (see PR 56675).  I don't know
> > of any publicly available fix.  My version of ext2fs avoids the bug by
> > doing buffering differently.
> >
> > As a workaround, unmount ext2fs file systems before rebooting.
> > Unmounting most file systems before rebooting should be the default
> > anyway (handled by shutdown(8) and reboot(8)), since unmounting may
> > fail and vfs_unmountall() in the kernel has no good way to log errors.
> 
> Thanks. It won't help though, as I don't have any ext2fs file systems, only 
> UFS. Also, my problem isn't 3 months old - I'm only seeing it since a few 
> weeks.
> 

I've been seeing this problem for a good few months now - if I boot into
single-user mode (using boot -s), fsck the (UFS2 only) disks and then type 
'reboot', the system will always give up on at least 1 buffer, sometimes 
even 4 or 5.   Of course, since / was mounted ro the filesystem is still 
clean when the system is rebooted, but it seems something thinks there's 
data to be written to a read-only filesystem!  The root filesystem is UFS2 
without softupdates.

--
Bruce Cran