Hi Russell,

As it happens, I just finished bisecting the stable tree yesterday. The
offending patch (459e3a21535ae3c7a9a123650e54f5c882b8fcbf) addresses some gcc-9
warnings. Reverting that patch fixes everything.

I submitted bug 203935 to bugzilla.kernel.org today.

More observations below,

Cheers ... Duncan.

On Wed, Jun 19, 2019 at 11:16:41PM +1000, luv-main wrote:
> On Tuesday, 28 May 2019 4:27:53 PM AEST Duncan Roe via luv-main wrote:
> > Following Andrew's exhortations at the last main meeting, I built 5.1 and
> > installed it on my laptop.
>
> I usually try to avoid building kernels, compiling a kernel with the same
> settings as Debian uses takes too long and changing the settings to a minimal
> set that matches what I want to do is more effort than I want.  Currently
> Debian/Experimental only has 5.0.

I have a customised version of the standard Slackware .config. Running *make
xconfig* on successive kernel revisions keeps it updated. I do keep it under
tight revision control, keeping automatic updates separate from any I do.
>
> > I went back to 5.0 and checked what was in debug.log (which logs
> > everything). And there was nothing at all! No hint that 5.1 had ever
> > started - just a 7 minute gap between the last 5.0 shutdown and 5.0
> > starting.
>
> Did any other log file have anything in that time period?

No
>
> Was networking operational, could you ping it?  If so network logging might
> work.

Didn't try a ping from another system, that would have been a nice idea.
>
> Did you try configuring your system to disable video mode changes?

No
>
> Serial console might be an option, but not many systems have proper serial
> ports nowadays.

I had a console all right. But I couldn't log in.
>
> > Have you seen this email before? Please mail me off-list if so.
> >
> > I originally sent this on 13th May but didn't see it come back.
>
> It got delivered to me then and was in my lists folder with lots of other
> unread mail from months ago.  Maybe people just couldn't think of good
> suggestions to offer you.

Maybe so. Bit *I* didn't see my own email even though I configured to see it.
Mail to the list owner about that has gone unanswered.

It took me weeks to think of trying a bisect. That required acceptance that the
problem was with the kernel.
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