linux-kernel - Re: [PATCH mm 1/4] lib/stackdepot: add printk_deferred

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Message-ID: <CA+fCnZf85vFovXaxCuxTDCEQtMZMFKeKvo8UZ_9j8uhPEnqb+Q@mail.gmail.com>
Date:   Wed, 13 Dec 2023 15:41:44 +0100
From:   Andrey Konovalov <andreyknvl@...il.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Marco Elver <elver@...gle.com>, andrey.konovalov@...ux.dev,
        Alexander Potapenko <glider@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Vlastimil Babka <vbabka@...e.cz>, kasan-dev@...glegroups.com,
        Evgenii Stepanov <eugenis@...gle.com>,
        Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Andrey Konovalov <andreyknvl@...gle.com>
Subject: Re: [PATCH mm 1/4] lib/stackdepot: add printk_deferred_enter/exit guards

On Tue, Dec 12, 2023 at 9:57 PM Andrew Morton <akpm@...ux-foundation.org> wrote:
>
> On Tue, 12 Dec 2023 19:59:29 +0100 Marco Elver <elver@...gle.com> wrote:
>
> > On Tue, 12 Dec 2023 at 01:14, <andrey.konovalov@...ux.dev> wrote:
> > >
> > > From: Andrey Konovalov <andreyknvl@...gle.com>
> > >
> > > Stack depot functions can be called from various contexts that do
> > > allocations, including with console locks taken. At the same time, stack
> > > depot functions might print WARNING's or refcount-related failures.
> > >
> > > This can cause a deadlock on console locks.
> > >
> > > Add printk_deferred_enter/exit guards to stack depot to avoid this.
> > >
> > > Reported-by: Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>
> > > Closes: https://lore.kernel.org/all/000000000000f56750060b9ad216@google.com/
> > > Signed-off-by: Andrey Konovalov <andreyknvl@...gle.com>
> >
> > Reviewed-by: Marco Elver <elver@...gle.com>
> >
> > Doesn't need Fixes, because the series is not yet in mainline, right?
>
> I've moved the series "stackdepot: allow evicting stack traces, v4"
> (please, not "the stack depot eviction series") into mm-nonmm-stable.
> Which is allegedly non-rebasing.
>
> So yes please, provide Fixes: on each patch.

Sure, I'll add them when I mail v2 after we figure out what to do with
patch #2. Thanks!