netdev - Re: Does Linux still support UP?

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Message-ID: <CAK2bqVJ-odOQP6jHQJr6Xuyiw26C3RLzuFJt0NbANDY=0sO3qA@mail.gmail.com>
Date: Sat, 30 Dec 2023 14:14:20 +0000
From: Chris Rankin <rankincj@...il.com>
To: netdev@...r.kernel.org
Cc: LKML <linux-kernel@...r.kernel.org>
Subject: Re: Does Linux still support UP?

Yes, the bright spots are my phone's flash. But I did check the images
to ensure that their information was still legible before posting
them.

Image resolution is 4128x2322, which should be more than adequate for
zooming in.

On Fri, 29 Dec 2023 at 17:28, Theodore Ts'o <tytso@....edu> wrote:
>
> On Fri, Dec 29, 2023 at 04:03:56PM +0000, Chris Rankin wrote:
> >
> > I have already attached as much information as I am *ever* likely to
> > be able to extract about this problem to the Bugzilla ticket.
>
> In addition to doing a bisection, something else you might want to
> try, since in the bugzilla you have hypothesized that it might be a
> bug in the e100 driver, is to try building a kernel without the driver
> configured, and see if that makes the kernel not hang.  If it does,
> then it's likely that the problem is either in the e100 driver, or
> maybe somewhere in the networking stack --- although in that case it's
> more likely someone else would have noticed.
>
> Something else you might try is to connect up a serial console, so you
> can get the full output from sysrq output.  The other advantage of
> using a serial console is people are much more likely to scan a text
> file with the consoles, as opposed to downloading and trying to make
> sense of the screen snapshots.  (BTW, was the flash enabled on your
> cell phone?  The bright white spot in the middle of the screen makes
> it very hard to read.)
>
> I'd also try sysrq-l (show backtrace for all active CPU's), so you can
> see where the kernel is actually hanging.
>
> For better or for worse, support for old hardware is a volunteer
> effort, so owners of the said old hardware need to do a bunch of the
> leg work.  Or if you can have a paid support contract, maybe you can
> pay someone to gather the detail, but when you say "is feature X
> supported" in an open source project, that has a different meaning
> from a commercial software product.
>
>                                                 - Ted