linux-kernel - cgroup_enable_task_cg_lists && PF_EXITING (Was: KCSAN: data-race in exit_signals / prepare

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Message-ID: <20191021142111.GB1339@redhat.com>
Date:   Mon, 21 Oct 2019 16:21:11 +0200
From:   Oleg Nesterov <oleg@...hat.com>
To:     Tejun Heo <tj@...nel.org>, Li Zefan <lizefan@...wei.com>,
        Johannes Weiner <hannes@...xchg.org>
Cc:     akpm@...ux-foundation.org, arnd@...db.de, christian@...uner.io,
        deepa.kernel@...il.com, ebiederm@...ssion.com, elver@...gle.com,
        guro@...com, linux-kernel@...r.kernel.org,
        syzkaller-bugs@...glegroups.com
Subject: cgroup_enable_task_cg_lists && PF_EXITING (Was: KCSAN: data-race in
 exit_signals / prepare_signal)

could you explain the usage of siglock/PF_EXITING in
cgroup_enable_task_cg_lists() ?

PF_EXITING is protected by cgroup_threadgroup_rwsem, not by
sighand->siglock.

Oleg.