linux-kernel - Re: [PATCH v3] Crash: add lock to serialize crash hotplug handling

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Message-ID: <ZRNz8T1XOX7PWOt6@MiWiFi-R3L-srv>
Date:   Wed, 27 Sep 2023 08:14:41 +0800
From:   Baoquan He <bhe@...hat.com>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        Eric DeVolder <eric.devolder@...cle.com>
Cc:     linux-kernel@...r.kernel.org, kexec@...ts.infradead.org,
        vschneid@...hat.com, sourabhjain@...ux.ibm.com
Subject: Re: [PATCH v3] Crash: add lock to serialize crash hotplug handling

On 09/26/23 at 04:53pm, Eric DeVolder wrote:
> 
> 
> On 9/26/23 15:50, Andrew Morton wrote:
> > On Tue, 26 Sep 2023 20:09:05 +0800 Baoquan He <bhe@...hat.com> wrote:
> > 
> > > Eric reported that handling corresponding crash hotplug event can be
> > > failed easily when many memory hotplug event are notified in a short
> > > period. They failed because failing to take __kexec_lock.
> > 
> > I'm assuming that this failure is sufficiently likely so as to  justify a -stable
> > backport of the fix.   Please let me know if this is incorrect.
> 
> Andrew,
> Correct, this is sufficiently likely to happen.

Agree. Maybe a Fixes tag need be added:
===
Fixes: 247262756121 ("crash: add generic infrastructure for crash hotplug support")