linux-kernel - regression with TTY changes in v5.12-rc1

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Date:   Thu, 4 Mar 2021 08:37:44 -0600
From:   Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>,
        Corey Minyard <cminyard@...sta.com>,
        Mark Brown <broonie@...nel.org>, Takashi Iwai <tiwai@...e.de>
Subject: regression with TTY changes in v5.12-rc1

Hi,
Our SOF/audio CI shows an across-the-board regression when we try 
v5.12-rc1, specifically on pause/resume tests with an interactive 
terminal running 'aplay -i' commands managed by expect to simulate the 
user pressing the space bar to pause/unpause. It turns out the processes 
are not longer killed and the audio devices remain busy (see publicly 
available test results listed below).

git bisect points to commit 33d4ae9885987 ("drivers:tty:pty: Fix a race
causing data loss on close"). Reverting the patch fixes the issue on all 
test devices.

Further analysis with Corey Minyard points to a problem where a slave 
tty will not get a SIGHUP when the master is closed.

Unless there is an alternate fix, a revert looks necessary?

Regards
-Pierre

https://github.com/thesofproject/linux/pull/2772
https://sof-ci.01.org/linuxpr/PR2772/build5352/devicetest/