From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from zeniv.linux.org.uk (zeniv.linux.org.uk [62.89.141.173]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 199A72144D7; Wed, 28 Jan 2026 04:58:10 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=62.89.141.173 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769576292; cv=none; b=SUfviBpWro2a8QNRL50Wig6XK8Q1IXe7qu2CYwT1Lzt3eUDJdfXksvZMtvvfc3chHjpchJNmqaL1oS52QnGy7RUsv02qvVLeVmWl0Svq9RTzQ1Qa47Dvtm97EgPn+ljajNRDc2FWg3VmrX4gpXSs6phSGiAO+nfs/gzr1wqezl0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769576292; c=relaxed/simple; bh=HPTDEhsdkkZGj61ILgUyYDUIsm4tG50xsMeSLWhJykw=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=bE4b0m0lVKQPg/bCSd1Gzx5EB3eigSx89jAzFBNFfv8dHF/lR2OI8GBOJju4QLQsmvaNtz4iukb3F3gvE2i2fcIcmpm7OGvCipY4v03S09jelZqaJG4M3urF0BhUYK9goJi8gTW9Omz8g5KySB7n0JcSNxADp9Gya1L2vDx3008= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=zeniv.linux.org.uk; spf=none smtp.mailfrom=ftp.linux.org.uk; dkim=pass (2048-bit key) header.d=linux.org.uk header.i=@linux.org.uk header.b=PKJoiaAI; arc=none smtp.client-ip=62.89.141.173 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=zeniv.linux.org.uk Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=ftp.linux.org.uk Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=linux.org.uk header.i=@linux.org.uk header.b="PKJoiaAI" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=linux.org.uk; s=zeniv-20220401; h=Sender:In-Reply-To:Content-Type: MIME-Version:References:Message-ID:Subject:Cc:To:From:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=daXjtGTfmlVfqWEsV/tKRDwuwZG19vc4O33UsaVuyC4=; b=PKJoiaAIeJUIezjpIUvwLfhLOU ljSMzyiy8niSruUOPj8Yhae/1tEMXXOfdDkBPWvk228fa+x3gT5ziOetsoIlPS6qPOcomc49/VYEg TXRw9lJUhkDbPABnmZAwnrgsKAmLUH7AQ4AnGZOBwiLlkTJITaGg5cRexxsqxsIPyy0pfvevgI10V EkVCPliHzrpbNBjpdQZtf8BtLMu9Kcsy7J4hQT6WtNuW7LYoAAzyuI/C3HY4Xp5Pm7lL1/zj5aQ3N KpLYJej9U/8afrfofjKQFQuivnbtyPIWzjnE64luVJY6SlrAo9HkNbF8Ew4ypXGp7RUjQj7TvDxC5 7aSVGjaw==; 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> Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Sender: Al Viro 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?