linux-kernel - Re: v5.14-rc3-rt1 losing wakeups?

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Date:   Sat, 31 Jul 2021 10:50:51 +0200
From:   Mike Galbraith <efault@....de>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        linux-rt-users@...r.kernel.org,
        Steven Rostedt <rostedt@...dmis.org>,
        Peter Zijlstra <peterz@...radead.org>
Subject: Re: v5.14-rc3-rt1 losing wakeups?

On Sat, 2021-07-31 at 05:33 +0200, Mike Galbraith wrote:
> On Sat, 2021-07-31 at 03:03 +0200, Mike Galbraith wrote:
> > On Fri, 2021-07-30 at 22:49 +0200, Thomas Gleixner wrote:
> > >
> >
> > > Which graphics driver is in use on that machine?
> >
> > The all too often problem child nouveau, but I don't _think_ it's
> > playing a roll in this, as nomodeset hangs as well.  I'll stuff it into
> > lappy (i915) to double check that.
>
> Hm, lappy doesn't seem to want to hang.  i915 isn't virgin, it needing
> a couple bandaids, but I doubt my grubby fingerprints matter.

Hours later i915 lappy is still working fine.

The problem is not my nvidia/nouveau desktop box. Taking KVM images
over to lappy on a USB SSD, the same QXL vbox that hangs with desktop
box as host also hangs with lappy as host.. a host that's still running
the very same kernel, the same build in fact (all instances are), just
fine.

	-Mike