[lxc-users] lxd process 100% CPU

[Stéphane Graber]

On Tue, Feb 14, 2017 at 03:36:17PM +0100, Paweł A. Gajda wrote:
> On Tue, Feb 14, 2017 at 2:56 PM, Stéphane Graber <stgraber at ubuntu.com>
> wrote:
> 
> > On Tue, Feb 14, 2017 at 01:43:20PM +0100, Paweł A. Gajda wrote:
> > > On Sat, Jan 28, 2017 at 4:35 PM, David Favor <david at davidfavor.com>
> > wrote:
> > >
> > > > Colin Holywell wrote:
> > > >
> > > > I recently upgraded the lxd installation on my Ubuntu 16.04 system. I
> > used
> > > > the lxd-stable repo to update the packages Ubuntu provides (version
> > 2.0 I
> > > > think?) to version 2.7. Everything upgraded fine but now once or twice
> > a
> > > > day the lxd process starts gobbling up a bunch of CPU time. There is
> > > > nothing in the /var/log/lxd/lxd.log or syslog to indicate what it is
> > doing.
> > > > If I restart the lxd service or wait a couple hours it will stops and
> > go
> > > > back to normal.
> > > >
> > > > Does any one know what it is doing? Can I downgrade back to the Ubuntu
> > > > supplied lxd version and not loose my containers?
> > > >
> > > > Try connecting to the process pid with strace + see if that surfaces
> > how
> > > > to fix problem.
> > > >
> > >
> > > Same with 2.8, 100% CPU, strace does not help much:
> > >
> > > # strace -p 2580
> > > strace: Process 2580 attached
> > > futex(0xfdcdf0, FUTEX_WAIT, 0, NULL
> > >
> > > Any hints? 2.2 works for months now in the same environent (PLD Linux,
> > > kernel 4.8) without any problem.
> >
> > Anything in lxd.log? If it's easily reproducible for you, then starting
> > the daemon with --debug may provide some more information in the log to
> > figure out what's going on.
> >
> 
> Nothing alarming in lxd.log, I'll try with --debug, thanks.
> Is golang version matters? I rebuild lxd with newest 1.7.5, will see.

It shouldn't. We test upstream with 1.6, 1.7 and tip and we ship built
packages in Ubuntu with 1.6 or 1.7 depending on Ubuntu releases.

-- 
Stéphane Graber
Ubuntu developer
http://www.ubuntu.com
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