From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (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 7345D47A872 for ; Fri, 11 Sep 2026 13:13:31 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.133.124 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789132412; cv=none; b=DXO0Kk8AuHlLWrYih2rAkEqy2kZ3Y0wt4UU6jQt9xiCvAM2+W+OC9QewwPJVv6aN3kZXqtuWyKABaxvzkESfXHg30qmjaZc/Hi1afzRIfYIWJkkgGFjd/xszduHjGE3+Zmp+AW0NFNyTqfb5Qw0Jw+JDFuiADizX399KKR+GAXo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789132412; c=relaxed/simple; bh=Tkr+JCbshi+MikFXz8lA+ivAi0uvu17bCSYP5N06Nl0=; h=From:In-Reply-To:References:To:Cc:Subject:MIME-Version: Content-Type:Date:Message-ID; b=Qv/I99b8JAQFjYmUVpmADJx2UVzJn1IGglRDqjqeyP0Op9vlGoFC0gHk7tF4t6Qme0wheLT6amUG8FQSS9Blra43knMjV9JtrauFf16obQktTkvcoBAU2amkKBhrD8LBoUPrGM14yr/HJtg4dyfjcBfzLo14Fv7a1Jm/Yzdnnt8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=T25uE3XS; arc=none smtp.client-ip=170.10.133.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="T25uE3XS" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1789132410; 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=HjxTnG9+IOVo/iqAqVa63V6GPAWyKsYUAzyVdTc8b5Q=; b=T25uE3XSIOF9BhAj7I1wU5VQ1iIF1EYK/ezNJ7Tlu3baN7TdV1WMX+XMWq49lwJyqqrYgb FA9bLLVS9VAkMv66egXEq/kkM+P5yGLgmPDjmrOCLW519wq41yNtA8au6rCptELa1zvw/Q lwaHM06ueM/aO8Ge7RbmsQWLoVvyoVk= Received: from mx-prod-mc-08.mail-002.prod.us-west-2.aws.redhat.com (ec2-35-165-154-97.us-west-2.compute.amazonaws.com [35.165.154.97]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-486-bUcwOhp6PdSxf_wSkglX0w-1; Fri, 11 Sep 2026 09:13:27 -0400 X-MC-Unique: bUcwOhp6PdSxf_wSkglX0w-1 X-Mimecast-MFC-AGG-ID: bUcwOhp6PdSxf_wSkglX0w_1789132405 Received: from mx-prod-int-10.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-10.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.95]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-08.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 1BF92180135F; Fri, 11 Sep 2026 13:13:25 +0000 (UTC) Received: from warthog.procyon.org.uk (unknown [10.44.32.54]) by mx-prod-int-10.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 819F941B; Fri, 11 Sep 2026 13:13:20 +0000 (UTC) Organization: Red Hat UK Ltd. Registered Address: Red Hat UK Ltd, Amberley Place, 107-111 Peascod Street, Windsor, Berkshire, SI4 1TE, United Kingdom. Registered in England and Wales under Company Registration No. 3798903 From: David Howells In-Reply-To: <3faab0c3-29be-44af-9569-1e12e8ed6a74@method-b.uk> References: <3faab0c3-29be-44af-9569-1e12e8ed6a74@method-b.uk> <2226525.1789118704@warthog.procyon.org.uk> To: Michael Mulqueen Cc: dhowells@redhat.com, ericvh@kernel.org, lucho@ionkov.net, asmadeus@codewreck.org, 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 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-ID: <2319643.1789132399.1@warthog.procyon.org.uk> Date: Fri, 11 Sep 2026 14:13:19 +0100 Message-ID: <2319644.1789132399@warthog.procyon.org.uk> X-Scanned-By: MIMEDefang 3.6 on 10.30.177.95 Michael Mulqueen wrote: > It appears that cachefiles isn't actually storing anything on 7.3. Yeah. There was a bug introduced into the iov iterator in the kernel. The fix is here: https://lore.kernel.org/linux-block/1667275.1788941191@warthog.procyon.org.uk/ > > Does the attached work for you? > > Yes, thanks, I get this on patched 7.2 and on patched 7.3-rc2: Great, thanks! David