From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from submarine.notk.org (submarine.notk.org [62.210.214.84]) (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 2F7BA485CCB for ; Thu, 10 Sep 2026 12:30:48 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=62.210.214.84 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789043453; cv=none; b=Ps7m/1amfIBSwCOWl9BG+btXvmdrWz2sqJm+kvrpuzmZwP43n1MebS99t/M9RKQYSh6JdNVa9dQ4CIY0URejt+49hRnTTd3VXpLsXsJbrCUmhgdJ4BXVW9AnM+LWKqie8qhvlNqx9mfmmJBb5cKqGmOnZP2HTRzGAiQlY0H/Xx8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789043453; c=relaxed/simple; bh=6urVsuJIUl715zS3BvrWpdJaYp5NktJ7HLYC0pqHIuA=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=g5GhFiwCVn5CdzFH2buto8ffWhgUnoD2V/Fzic03vihsOB5IRcD4iJqLRw7Frst9KBQADutiIDzEa5oX8pTZSt3wHMQOEJsQvlUExapvIVoblrBBGlUV1JyUlw/LumERJXRjGVn3YIkyt4qdywm/yLdXJTfcAWkUWFVRWWY3Ntw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=codewreck.org; spf=pass smtp.mailfrom=codewreck.org; dkim=pass (2048-bit key) header.d=codewreck.org header.i=@codewreck.org header.b=0lRBhRvR; arc=none smtp.client-ip=62.210.214.84 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=codewreck.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=codewreck.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=codewreck.org header.i=@codewreck.org header.b="0lRBhRvR" Received: from gaia.codewreck.org (localhost [127.0.0.1]) by submarine.notk.org (Postfix) with ESMTPS id 17DDE14C2D6; Thu, 10 Sep 2026 14:23:43 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=codewreck.org; s=2; t=1789043026; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=jPANr6PUeBWdZgT/kVNZz2RVAV2JjeA9vYyXUoFCFU0=; b=0lRBhRvR4b4OcIGXAp0Ga1mnes1kPOYs+RDUSCfmdCM53MxwOrIsV3T+RwsgMYgczAqUh/ 1VqNKQMMSNFhbQ2kQ5whbbekrt0GBuNLtQL6gHvurXjCkeaQo03yf3lZayjWKVwmmT5eTj 0mbq22czH2IpzMhUOnHOoUk7c2wCbvH+cxiVjeFUb/3hKxQApj+tL8PZrVOc+BitVvjnAM 6kkGgIJWllNmO6xgxuPPs+cJsLdq8NOdUk65GOhSTuTqZx80Faoal2ZkxS54nzw1KqA36d ikyvqJF9vIs9ZtingGd1XPgAOoV0viKDiw9HQhLgg6R/zwJVefGl3aDkYqE5Mg== Received: from localhost (gaia.codewreck.org [local]) by gaia.codewreck.org (OpenSMTPD) with ESMTPA id 98836a56; Thu, 10 Sep 2026 12:23:42 +0000 (UTC) Date: Thu, 10 Sep 2026 21:23:27 +0900 From: Dominique Martinet To: Michael Mulqueen , dhowells@redhat.com Cc: ericvh@kernel.org, lucho@ionkov.net, pc@manguebit.org, linux_oss@crudebyte.com, v9fs@lists.linux.dev, netfs@lists.linux.dev, linux-fsdevel@vger.kernel.org, regressions@lists.linux.dev Subject: Re: PROBLEM: [REGRESSION 7.1-rc4 -> 7.1-rc5] 9p: silent NUL corruption of file data on cache modes with CACHE_WRITEBACK Message-ID: References: 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=utf-8 Content-Disposition: inline In-Reply-To: Michael Mulqueen wrote on Thu, Sep 10, 2026 at 11:56:24AM +0100: > This is my first kernel bug report, so let's hope I've done it right! Thank you for the detailed report! I don't have time to look right now but given the timing (7.1-rc4 -> rc5) and that it affects cache modes only it looks like a regression in netfs, David, can you have a look? -- Dominique