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Wong" , Matthew Wilcox , Christoph Hellwig , SHAURYA RANE , akpm@linux-foundation.org, shakeel.butt@linux.dev, eddyz87@gmail.com, andrii@kernel.org, ast@kernel.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-kernel-mentees@lists.linux.dev, skhan@linuxfoundation.org, david.hunter.linux@gmail.com, khalid@kernel.org, syzbot+09b7d050e4806540153d@syzkaller.appspotmail.com, bpf Subject: Re: [PATCH] mm/filemap: fix NULL pointer dereference in do_read_cache_folio() Message-ID: References: <20251117164155.GB196362@frogsfrogsfrogs> <20251118161220.GE196362@frogsfrogsfrogs> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html X-Rspamd-Server: rspam12 X-Rspam-User: X-Rspamd-Queue-Id: 88BF0120005 X-Stat-Signature: t6ta7ya5eunky1rgiaorxcbqbkoeci4x X-HE-Tag: 1763531526-808239 X-HE-Meta: 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 vfg4WTHn 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Tue, Nov 18, 2025 at 11:38:36AM -0800, Andrii Nakryiko wrote: > We have plenty of build ID tests in BPF selftest that validate this > functionality: And none of them is run on a wide variety of file systems, presumably because they are only run by BFP developers. IFF we allow for magic file access methods it needs to be part of regular file system testing.