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

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Message-ID: <11bebd5e-8183-d7a7-6acc-53b00a6cc2d5@oracle.com>
Date:   Tue, 26 Sep 2023 16:53:37 -0500
From:   Eric DeVolder <eric.devolder@...cle.com>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        Baoquan He <bhe@...hat.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 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.
Thanks,
eric