linux-kernel - Re: [PATCH 2/3] kthread: Prevent deadlock when kthread_mod_delayed_work() races with kthread_cancel_delayed_work

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Message-Id: <20210610143030.f599946ec11e1eccde6af4f0@linux-foundation.org>
Date:   Thu, 10 Jun 2021 14:30:30 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Petr Mladek <pmladek@...e.com>
Cc:     Martin Liu <liumartin@...gle.com>, Oleg Nesterov <oleg@...hat.com>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Tejun Heo <tj@...nel.org>, minchan@...gle.com,
        davidchao@...gle.com, jenhaochen@...gle.com,
        clang-built-linux@...glegroups.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] kthread: Prevent deadlock when
 kthread_mod_delayed_work() races with kthread_cancel_delayed_work_sync()

On Thu, 10 Jun 2021 15:30:50 +0200 Petr Mladek <pmladek@...e.com> wrote:

> The system might hang with the following backtrace:

Well that's not good.

> Fixes: 9a6b06c8d9a220860468a ("kthread: allow to modify delayed kthread work")
> Reported-by: Martin Liu <liumartin@...gle.com>
> Signed-off-by: Petr Mladek <pmladek@...e.com>

Was a -stable backport considered?