Re: occational system lock up in 6.0_BETA and 6.99.5

[Ignatios Souvatzis <is%netbsd.org@localhost>]

On Thu, May 03, 2012 at 03:33:36PM +0900, Toru Nishimura wrote:
> Sore more rumbling on system lockup under heavy disk I/O.
> 
> I found that dump lockup happens on the combination of WAPBL and
> dump -X snapshot.
> 
> - Standard dump operation without -X snapshot does work either in WAPBL
> or no WAPBL case.
> - Snapshot dump of WAPBL-less (/sbin/mount -o update,nolog) filesys works.
> 
> Amusingly "reenabling WAPBL (-o update,log) during dump -X" is found Ok.
> And next invokation of dump -X ends up with lockup some seconds later.

I think I've seen this but with rsync, so I moved the backup script back
to snapshot-less rsync. This was with sparc64/5.99.mumble , and on a
production setup, so I couldn't experiment.


        -is