> 
> Simon Burge <simonb@telstra.com.au> writes:
> 
> > Has anyone had problems with hangs during a shutdown?
> 
> I saw this at least on three machines, but not so often.  They prints
> 'syncing disks' and hang.  I'm not yet looking in this problem, but it
> seems process are waiting struct buf.
> 
> And now, as I wrote in tech-kern, I found that when I enabled
> accounting via nfs on my diskless, tendency of hang seems increase.
> 
> enami.
> 

We run some 20+ Pentium-Pro's with a common NFS mounted /usr. Since
upgrading from 1.2.1 to 1.2G this shutdown hang is rock solid on all machines.

I have checked that shutdown works OK if I use /usr on a local disk,
so seems related to nfs.

I am happy to try some debugging but don't really know how to start.

When in the hung state the machine responds to ping but otherwise appears dead.

Tim.