ffs snapshot lockup

[Kris Kennaway]

On Fri, Sep 22, 2006 at 02:55:34PM -0400, Vivek Khera wrote:
> Yesterday we upgraded an amd64 system from 6.1 to 6.2-PRE from a  
> cvsup of September 20 evening.  The overnight nightly dump to tape  
> went off normally.  This afternoon when the sysadmin was performing  
> the level0 backup, the ffs_mksnap program locked up the entire system.
> 
> It wasn't the expected short hiccup that mksnap sometimes causes --  
> it was started just prior to lunchtime and when we got back everyone  
> had wedged login sessions and IMAP sessions, and ffs_mksnap was in  
> "D" state according to ps and idle for about 90 minutes.
> 
> The only way out was to reboot the system.
> 
> I know this is very un-useful as a bug report, but I'm putting this  
> out in case anyone else has noticed this.  It has never happened to  
> us before when we were running 5.4 and then 6.1 on this box.  Nothing  
> else changed on the system during this time.

Yep, we'd need additional debugging to proceed.

Kris