[ale] lsof and a hung system

[Lightner, Jeff]

I hate to ask but did you use the force option when trying to unmount the NFS mount?

Have you tried stopping nfs.client?  autofs?  (nfs server if running?) 

For what its worth I've seen this kind of hang on a heavily loaded server (used for backups with NFS mounted deduplication appliances)  and have actually seen it clear after a few minutes for brief periods.


-----Original Message-----
From: ale-bounces at ale.org [mailto:ale-bounces at ale.org] On Behalf Of DJ-Pfulio
Sent: Monday, October 19, 2015 6:30 PM
To: ale at ale.org
Subject: Re: [ale] lsof and a hung system

On 10/19/2015 06:14 PM, Jim Kinney wrote:
> So the user notifies me they can do a cd to an nfs mounted directory. 
> I get on and can't do ls -la on /. there's a trio of cat commands that 
> are hung and anything that reads data from the drives basically does 
> nothing. Nothing is running but the load average is 20 and not 
> changing. So I try to kill the cat's and unmount the nfs folder.  No 
> work. Dang! what else is open? run lsof. Nothing happens.
> I'm expecting all sorts of file system errors when after I press the 
> reset switch. A sync command just hangs. dmesg shows user space 
> applications segfaults all over the the place. So the (very new) user 
> would just run it again. I've got a zombie collection that The Walking 
> Dead would call a "herd".
> 

sync?
hard?
nfs v3/v4?
mount options?



Zombies?!!?

*
http://abcnews.go.com/Technology/zombie-bees-found-northeast/story?id=22290433

* http://www.cdc.gov/phpr/zombies.htm - gotta be prepared

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