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Received: from viro by zeniv.linux.org.uk with local (Exim 4.99.1 #2 (Red Hat Linux)) id 1vliYK-00000009qV4-2BjG; Fri, 30 Jan 2026 07:04:24 +0000 Date: Fri, 30 Jan 2026 07:04:24 +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: <20260130070424.GV3183987@ZenIV> References: <20251118051604.3868588-1-viro@zeniv.linux.org.uk> <2026012715-mantra-pope-9431@gregkh> <20260128045954.GS3183987@ZenIV> <20260129032335.GT3183987@ZenIV> <20260129225433.GU3183987@ZenIV> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: 87EA0C0003 X-Stat-Signature: iispny8k4jaiz1rof6j98xhns4u1nnui X-Rspam-User: X-HE-Tag: 1769756562-85408 X-HE-Meta: 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 t6EMWK1S 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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 Thu, Jan 29, 2026 at 05:16:20PM -0800, Samuel Wu wrote: > On Thu, Jan 29, 2026 at 2:52 PM Al Viro wrote: > > > > Sorry, I hadn't been clear enough: if you do > > > git switch --detach 1544775687f0 > > > and build the resulting tree, does the breakage reproduce? What I want > > > to do is to split e5bf5ee26663 into smaller steps and see which one > > > introduces the breakage, but the starting point would be verify that > > > there's no breakage prior to that. > > Ultimately, same conclusion as before: 6.18-rc5 with patches up to > 1544775687f0 works, but adding e5bf5ee26663 breaks it. OK. Could you take a clone of mainline repository and in there run ; git fetch git://git.kernel.org:/pub/scm/linux/kernel/git/viro/vfs.git for-wsamuel:for-wsamuel then ; git diff for-wsamuel e5bf5ee26663 to verify that for-wsamuel is identical to tree you've seen breakage on ; git diff for-wsamuel-base 1544775687f0 to verify that for-wsamuel-base is the tree where the breakage did not reproduce Then bisect from for-wsamuel-base to for-wsamuel. Basically, that's the offending commit split into steps; let's try to figure out what causes the breakage with better resolution...