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Received: from viro by zeniv.linux.org.uk with local (Exim 4.99.1 #2 (Red Hat Linux)) id 1vkxek-00000007aLd-3OJ0; Wed, 28 Jan 2026 04:59:54 +0000 Date: Wed, 28 Jan 2026 04:59:54 +0000 From: Al Viro To: Samuel Wu Cc: Greg KH , linux-fsdevel@vger.kernel.org, torvalds@linux-foundation.org, brauner@kernel.org, jack@suse.cz, raven@themaw.net, miklos@szeredi.hu, neil@brown.name, a.hindborg@kernel.org, linux-mm@kvack.org, linux-efi@vger.kernel.org, ocfs2-devel@lists.linux.dev, kees@kernel.org, rostedt@goodmis.org, linux-usb@vger.kernel.org, paul@paul-moore.com, casey@schaufler-ca.com, linuxppc-dev@lists.ozlabs.org, john.johansen@canonical.com, selinux@vger.kernel.org, borntraeger@linux.ibm.com, bpf@vger.kernel.org, clm@meta.com, android-kernel-team Subject: Re: [PATCH v4 00/54] tree-in-dcache stuff Message-ID: <20260128045954.GS3183987@ZenIV> References: <20251118051604.3868588-1-viro@zeniv.linux.org.uk> <2026012715-mantra-pope-9431@gregkh> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Rspamd-Server: rspam11 X-Stat-Signature: eafuj47w41ujqb7mfqpjob1xqt5fyiyy X-Rspam-User: X-Rspamd-Queue-Id: 9A47240006 X-HE-Tag: 1769576294-859221 X-HE-Meta: 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 XvNXxL8G /H6PrJuGSsGQmQertOyzqjHB0XX63iXLusp9jmCV0G3WVPmA+Q1Cjdb28HAtzjoygQP0QWaTz6vxcXVtPdRQwJd+pWTjAJe7zYJ3itbaNjow5btiQLR+SlpivYuboF1C5gGCUftx3GONrbnRS1R+yjWfEgNkWexddrv07tsQ3ri42XK35wVpugA0G7ak1LhiL4PwLDNKBZ6g6HguMTWnisDLIcUwB+4rpKM0BiYlWRJYi9ptpmVF3sH9Iu3y7aD7yJ7YWnki0GuA0tsNzSOwqdjDSTDxcTJ801ZzzwjHAGemlxPa+NSzg2xSyU5gIEzsVpdIR+9biph9ejQkSMXcvWjoV/4vVs5YeXrJ7up2EYO6/Bn+xL0m2Pbb8bUb0hPuyZa3/1b/zbZKbSuWPWTZoL5CnqSg+HtQt/GfwwQWVReTQFy/RTSLdrS0JocelXpcc4snu 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, Jan 27, 2026 at 06:02:25PM -0800, Samuel Wu wrote: > Thanks for the suggestion. I tried a few different setups, and now I'm > fairly confident e5bf5ee26663 ("functionfs: fix the open/removal > races") is the culprit. I did have to revert 6ca67378d0e7 ("convert > functionfs") and c7747fafaba0 ("functionfs: switch to > simple_remove_by_name()") to successfully build, but reverting only > those two in isolation did not fix the issue. Very interesting... Does 1544775687f0 (parent of e5bf5ee26663) demonstrate that behaviour?