linux-kernel - Re: v4.13 on nokia n900: oops during tethering

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Message-ID: <20180219190454.GB19366@amd>
Date:   Mon, 19 Feb 2018 20:04:54 +0100
From:   Pavel Machek <pavel@....cz>
To:     Sakari Ailus <sakari.ailus@...ux.intel.com>
Cc:     pali.rohar@...il.com, sre@...nel.org,
        kernel list <linux-kernel@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-omap@...r.kernel.org, tony@...mide.com, khilman@...nel.org,
        aaro.koskinen@....fi, ivo.g.dimitrov.75@...il.com,
        patrikbachan@...il.com, serge@...lyn.com, abcloriens@...il.com,
        clayton@...ftyguy.net, martijn@...xit.nl,
        Filip Matijević <filip.matijevic.pz@...il.com>
Subject: Re: v4.13 on nokia n900: oops during tethering

Hi!

> On Mon, Feb 12, 2018 at 09:10:00PM +0100, Pavel Machek wrote:
> > Hi!
> > 
> > During tethering, I got oops in ssi_stop_tx(), followed by failure of
> > GPRS. I used GPRS tethering a lot with some older kernel, and it was
> > stable for hours.
> > 
> > It seems v4.12 has the same problem. In v4.15 usb networking does not
> > work at all, so I can't test... v4.10 seems to have similar problem. (Testing is
> > slighlty tricky, as my internet connection is ... tethering using
> > N900.)
> 
> Based on a quick look ssi_stop_tx() is called too many times (i.e. once
> more than ssi_start_tx()). This would appear to be an interal problem
> with the SSI codebase (or whatever lies there; I don't know the current
> codebase).

If I change BUG_ON in ssi_stop_tx() to warning and return, I see the
warning and system survives it.

> Did this work in the past? When? There appear to have been changes in IRQ
> handling some time in 2016...

Actually, I'm not sure any more :-(. I did have tethering running
overnight some time ago, but it was on slower mobile data, and over
wifi.
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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