linux-kernel - Re: v6.16-rc5: ttys: auto login failed Login incorrect

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Message-ID: <CA+G9fYurLq9o_PSbQKCOmSkQfa5-qtAu2HR1PzySBmJM4C4F3g@mail.gmail.com>
Date: Wed, 9 Jul 2025 17:55:37 +0530
From: Naresh Kamboju <naresh.kamboju@...aro.org>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, linux-serial@...r.kernel.org
Cc: open list <linux-kernel@...r.kernel.org>, lkft-triage@...ts.linaro.org, 
	Linux Regressions <regressions@...ts.linux.dev>, linux-stable <stable@...r.kernel.org>, 
	Jiri Slaby <jslaby@...e.com>, Aidan Stewart <astewart@...telic.com>, 
	Jakub Lewalski <jakub.lewalski@...ia.com>, Fabio Estevam <festevam@...il.com>, 
	Anders Roxell <anders.roxell@...aro.org>, Arnd Bergmann <arnd@...db.de>, 
	Dan Carpenter <dan.carpenter@...aro.org>, Ben Copeland <benjamin.copeland@...aro.org>
Subject: Re: v6.16-rc5: ttys: auto login failed Login incorrect

+

On Wed, 9 Jul 2025 at 16:31, Greg Kroah-Hartman
<gregkh@...uxfoundation.org> wrote:
>
> On Wed, Jul 09, 2025 at 04:26:53PM +0530, Naresh Kamboju wrote:
> > Approximately 20% of devices are experiencing intermittent boot failures
> > with this kernel version. The issue appears to be related to auto login
> > failures, where an incorrect password is being detected on the serial
> > console during the login process.
> >
> > This intermittent regression is noticed on stable-rc 6.15.5-rc2 and
> > Linux mainline master v6.16-rc5. This regressions is only specific
> > to the devices not on the qemu's.
> >
> > Test environments:
> >  - dragonboard-410c
> >  - dragonboard-845c
> >  - e850-96
> >  - juno-r2
> >  - rk3399-rock-pi-4b
> >  - x86
> >
> > Regression Analysis:
> > - New regression? Yes
> > - Reproducibility? 20% only
> >
> > Test regression: 6.15.5-rc2 v6.16-rc5 auto login failed Login incorrect
> >
> > Reported-by: Linux Kernel Functional Testing <lkft@...aro.org>
> >
> > ## log in problem
> >
> > runner-ns46nmmj-project-40964107-concurrent-0 login: #
> > Password:
> > Login incorrect
> > runner-ns46nmmj-project-40964107-concurrent-0 login:
> >
> > ## Investigation
> > The following three patches were reverted and the system was re-tested.
> > The previously reported issues are no longer observed after applying the
> > reverts.
> >
> > serial: imx: Restore original RXTL for console to fix data loss
> >     commit f23c52aafb1675ab1d1f46914556d8e29cbbf7b3 upstream.
> >
> > serial: core: restore of_node information in sysfs
> >     commit d36f0e9a0002f04f4d6dd9be908d58fe5bd3a279 upstream.
> >
> > tty: serial: uartlite: register uart driver in init
> >     [ Upstream commit 6bd697b5fc39fd24e2aa418c7b7d14469f550a93 ]
>
>
> As stated before, those are 3 totally independent changes.  Any chance
> you can nail this down to just one of the above?

You're right, since this issue is intermittent, it's challenging to reproduce
consistently. Pinpointing the exact commit would be ideal, but it will
require more time.

>
> thanks,
>
> greg k-h

Thanks,
Naresh