wired memory leak at r298785

[Warner Losh]

On Mon, May 2, 2016 at 6:55 PM, Steve Wills <swills at freebsd.org> wrote:

> Hi,
>
> On 05/ 2/16 09:32 AM, Steve Wills wrote:
> > Hi,
> >
> > Just did my monthly update and r298785 seems to be leaking wired memory
> > rather rapidly. My system has 8gb of RAM and the amount of wired memory
> > just goes up and up continuously. It takes about 12 hours before it
> > exhausts all the RAM and sort of locks up (though shutdown still works).
> >
> > I also made one other change to the system at the same time as updating,
> > which was to add another disk and configure it using ZFS. Perhaps this
> > is a ZFS on PowerPC64 issue? My amd64 box running the same rev of
> > CURRENT doesn't have the issue.
> >
>
> I've rebooted the box and started repeatedly logging the output of
> vmstat -m. It seems to show CAM CCB using a lot of memory and growing
> rather rapidly. For example, here's a few lines of diff output:
>
> - CAM CCB 91418 182836K - 187149 2048
> + CAM CCB 447070 894140K - 900292 2048
>
> from two samples that are 60 minutes apart.
>
> The box is isn't terribly busy, it's just running the monitoring daemons
> running (snmpd, collectd), whatever web requests are hitting it (very
> few if any), this logging process, and my shell, etc.
>
> Could this be related to recent changes in CURRENT?
>
> Copying Scott and Warner in case they have comments on this since I'm
> told they have been active in this area recently.
>

I've been looking into it. I'm not sure what's up since I don't see it
in production. I'll give it a bump in priority though.

Warner