linux-kernel - Re: circular locking splat in fs/proc/vmcore.c

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Message-ID: <yt9da6et77w3.fsf@linux.ibm.com>
Date:   Mon, 14 Feb 2022 17:03:24 +0100
From:   Sven Schnelle <svens@...ux.ibm.com>
To:     David Hildenbrand <david@...hat.com>
Cc:     linux-kernel@...r.kernel.org
Subject: Re: circular locking splat in fs/proc/vmcore.c

Hi David,

David Hildenbrand <david@...hat.com> writes:
> On 14.02.22 16:22, Sven Schnelle wrote:
>> I think we could also switch the list to an rcu protected list, but i
>> don't know the code really. Any opinions how to fix this?
>> 
> did you stumble over
>
> https://lkml.kernel.org/r/20220119193417.100385-1-david@redhat.com
>
> yet?
>
> It should be fixing the (mostly impossible to trigger) splat you've seen
> --  via sleepable rcu :)
>
> The fix is scheduled for v5.18.

No, i missed that. Thank you very much!

/Sven