linux-kernel - Re: [PATCH v1] mm/gup: remove (VM_)BUG

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Message-ID: <55fdc47f-5a14-43d4-814b-7defd1101050@lucifer.local>
Date: Thu, 24 Jul 2025 11:56:09 +0100
From: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
To: Vlastimil Babka <vbabka@...e.cz>
Cc: John Hubbard <jhubbard@...dia.com>, Jason Gunthorpe <jgg@...pe.ca>,
        David Hildenbrand <david@...hat.com>, Michal Hocko <mhocko@...e.com>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        "Liam R. Howlett" <Liam.Howlett@...cle.com>,
        Mike Rapoport <rppt@...nel.org>,
        Suren Baghdasaryan <surenb@...gle.com>, Peter Xu <peterx@...hat.com>
Subject: Re: [PATCH v1] mm/gup: remove (VM_)BUG_ONs

On Thu, Jul 24, 2025 at 12:54:26PM +0200, Vlastimil Babka wrote:
> On 6/9/25 11:57, Vlastimil Babka wrote:
> > On 6/7/25 8:00 PM, John Hubbard wrote:
> >> On 6/7/25 6:53 AM, Lorenzo Stoakes wrote:
> >> The worst part is that if you go to reproduce a problem, you don't
> >> see the next warning in the logs!! This is devastating, especially if
> >> the site makes it hard to ask for a system reboot. (If you have
> >> ~20,000 nodes in the cluster, a reboot is not a small affair.)
> >
> > Assuming you know how to reproduce the problem... I wonder if it would
> > help if there was a way (sysctl?) to re-arm all the _ONCE warnings. It
> > shouldn't be that hard hopefully?
>
> Oh hey it already exists, since 2017
>
> echo 1 > /sys/kernel/debug/clear_warn_once

Ohhh! Nice!