ffs snapshot lockup

[Kostik Belousov]

On Thu, Oct 05, 2006 at 10:01:07AM -0400, Vivek Khera wrote:
> 
> On Oct 5, 2006, at 4:30 AM, Kostik Belousov wrote:
> 
> >>
> >>The network load was minimal at the time.  I had everyone log out and
> >>close mail etc.
> >>
> >
> >What were the symptoms of locked system ? Could you log in on  
> >console, or
> >do something at the shell prompt on console ?
> 
> Console was non-responsive.  This time dump locked doing /usr so  
> pretty much anything you try to run will block.  When the lockup  
> happens when dump is running on my home dir (/u/yertle1) partition,  
> as long as you don't need that partition you can log in and run any  
> programs you like.  I have a service account whose home dir is in / 
> var and was able to login that time to that account.  No such luck  
> this time since any activity pretty much uses /usr.
> 
> Ping was responding (our monitoring didn't complain it was down).
> 
> The only thing I could do was break to debugger on the console.
> 
This is very strange. You 3 instances of getty where just reading the
tty input, and all suspectible processes (like sshd) are waiting on net
events. No processes are blocked on the fs. One nfsd is serving the request,
and dump is active.
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: application/pgp-signature
Size: 187 bytes
Desc: not available
Url : http://lists.freebsd.org/pipermail/freebsd-stable/attachments/20061006/0daefab4/attachment-0001.pgp