This looks familiar. I thought it got fixed with:
commit 5353ed8deedee9e5acb9f896e9032158f5d998de
Author: Colin Ian King <colin.k...@canonical.com>
Date: Mon Jun 20 15:40:27 2016 +0100
devpts: fix null pointer dereference on failed memory allocation
An ENOMEM when creating a pair tty in tty_ldisc_setup causes a null
pointer dereference in devpts_kill_index because tty->link->driver_data
is NULL. The oops was triggered with the pty stressor in stress-ng when
in a low memory condition.
tty_init_dev tries to clean up a tty_ldisc_setup ENOMEM error by calling
release_tty, however, this ultimately tries to clean up the NULL pair'd
tty in pty_unix98_remove, triggering the Oops.
Add check to pty_unix98_remove to only clean up fsi if it is not
NULL.
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https://bugs.launchpad.net/bugs/1651376
Title:
ISST-LTE:pVM:seedlp2:ubuntu 16.04.2: oom occurs when running stress
tests
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