Re: [Bug 99471] System locks with kswapd0 and kworker taking full IO and mem

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On Mon, 5 Oct 2015 22:03:46 +0200 Michal Hocko <mhocko@xxxxxxxxxx> wrote:

> On Tue 15-09-15 10:39:19, Johannes Weiner wrote:
> > On Thu, Sep 10, 2015 at 02:04:18PM -0700, Andrew Morton wrote:
> > > (switched to email.  Please respond via emailed reply-to-all, not via the
> > > bugzilla web interface).
> > > 
> > > On Tue, 01 Sep 2015 12:32:10 +0000 bugzilla-daemon@xxxxxxxxxxxxxxxxxxx wrote:
> > > 
> > > > https://bugzilla.kernel.org/show_bug.cgi?id=99471
> > > 
> > > Guys, could you take a look please?

So this isn't fixed and a number of new reporters (cc'ed) are chiming
in (let's please keep this going via email, not via the bugzilla UI!).

We have various theories but I don't think we've nailed it down yet.

Are any of the reporters able to come up with a set of instructions
which will permit the developers to reproduce this bug locally?

Can we think up a way of adding some form of debug/instrumentation to
the kernel which will permit us to diagnose and fix this?  It could be
something which a tester manually adds or it could be something
permanent, perhaps controlled via a procfs knob.

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