linux-kernel - Re: Strange issues with epoll since 5.0

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Message-ID: <20190429210427.dmfemfft2t2gdwko@dcvr>
Date:   Mon, 29 Apr 2019 21:04:27 +0000
From:   Eric Wong <e@...24.org>
To:     Davidlohr Bueso <dave@...olabs.net>
Cc:     Deepa Dinamani <deepa.kernel@...il.com>,
        Arnd Bergmann <arnd@...db.de>,
        Al Viro <viro@...iv.linux.org.uk>,
        Jason Baron <jbaron@...mai.com>, linux-kernel@...r.kernel.org,
        Omar Kilani <omar.kilani@...il.com>,
        linux-fsdevel@...r.kernel.org
Subject: Re: Strange issues with epoll since 5.0

Davidlohr Bueso <dave@...olabs.net> wrote:
> On Sun, 28 Apr 2019, Eric Wong wrote:
> 
> > Just running one test won't trigger since it needs a busy
> > machine; but:
> > 
> > 	make test/mgmt_auto_adjust.log
> > 	(and "rm make test/mgmt_auto_adjust.log" if you want to rerun)
> 
> fyi no luck reproducing on both either a large (280) or small (4 cpu)
> machine, I'm running it along with a kernel build overcommiting cpus x2.

Thanks for taking a look.

> Is there any workload in particular you are using to stress the box?

Just the "make -j$N check" I mentioned up-thread which spawns a
lot of tests in parallel.  For the small 4 CPU machine,
-j32 or -j16 ought to be reproducing the problem.

I'll try to set aside some time this week to get familiar with
kernel internals w.r.t. signal handling.