[ale] lsof and a hung system

[Jim Kinney]

The force failed. That's when my alarm bells hit 11 on the 10 dial. I'm
suspecting ram failure. Can't test that until I reboot tomorrow.
On Oct 19, 2015 7:36 PM, "Lightner, Jeff" <JLightner at dsservices.com> wrote:

> 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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