From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 DE580279DAA; Fri, 15 Aug 2025 10:09:30 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755252571; cv=none; b=MH/ww9XU4je3c52mHnM8nAKD5/lEnLJ1SbFfVPX9YQV3MtwNOSfmq5iDXIJKScm2JL+jcjNnZ4IB31tDuSMrzuW4ni36LtCbmfx6B3/8yfCI6KvkaWwN2Gc91Z7giPUgG6YwDP/0efm1DBmAIOqLqrNxnSDd+dyU10RP/y8k58Y= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755252571; c=relaxed/simple; bh=4F6G06c4lwRmjRxDA3kCpdM0Fpzl2wgfCSFO8ncYib4=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=N+t4SwBJZkd2wzUCfSzXnIVglBco151MXU1TiUxAXjmwg7Jc2X7rUZJ3SJzu6B5KO7PqJB9ISIMOE7TLiK+N42IK7yLtFBuZZ1k6sXe64JHK3fzdebrxNibrFIfLKMOuQzg71dkJSL92q5Ru0EQzqIjix+dE9TeDkiS83zzToq8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=eT8QeuIm; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="eT8QeuIm" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 84E8AC4CEF5; Fri, 15 Aug 2025 10:09:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1755252570; bh=4F6G06c4lwRmjRxDA3kCpdM0Fpzl2wgfCSFO8ncYib4=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=eT8QeuImN6Mc0M1N8IPUm86ATESY2jDh0jxkLdPIjuGK8mAZmv5TpZTtKrziii0BK iD4JcFBmZ+82M6OZlZj7XpbT8ro/alnxe9WxMgx1GTGwV3Caeh7PSIIDZoDzahXIju eEGaJN277PxU+EIbTJzqPAA9qTxytkAviEc/bXpbkO0Mlv/m83XUnyuROb21Jrgf3m /wOVlwFzaFELgaexErcumbgtSSmbyVbRoVeV26Z+7j29CHtlOLa2qkJnGJ3wU0a4RJ PbCIsd1AupDwoRKhwl2PvHb2CH0jKsuXlTR8yE5DXNfq3uFPDWqGBfIWM0IWQ0lOhl OWc75fokBhfDg== Date: Fri, 15 Aug 2025 11:09:24 +0100 From: Will Deacon To: "Michael S. Tsirkin" Cc: syzbot , davem@davemloft.net, edumazet@google.com, eperezma@redhat.com, horms@kernel.org, jasowang@redhat.com, kuba@kernel.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, pabeni@redhat.com, sgarzare@redhat.com, stefanha@redhat.com, syzkaller-bugs@googlegroups.com, virtualization@lists.linux.dev, xuanzhuo@linux.alibaba.com Subject: Re: [syzbot] [kvm?] [net?] [virt?] WARNING in virtio_transport_send_pkt_info Message-ID: References: <20250812052645-mutt-send-email-mst@kernel.org> <689b1156.050a0220.7f033.011c.GAE@google.com> <20250812061425-mutt-send-email-mst@kernel.org> Precedence: bulk X-Mailing-List: netdev@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: <20250812061425-mutt-send-email-mst@kernel.org> On Tue, Aug 12, 2025 at 06:15:46AM -0400, Michael S. Tsirkin wrote: > On Tue, Aug 12, 2025 at 03:03:02AM -0700, syzbot wrote: > > Hello, > > > > syzbot has tested the proposed patch but the reproducer is still triggering an issue: > > WARNING in virtio_transport_send_pkt_info > > OK so the issue triggers on > commit 6693731487a8145a9b039bc983d77edc47693855 > Author: Will Deacon > Date: Thu Jul 17 10:01:16 2025 +0100 > > vsock/virtio: Allocate nonlinear SKBs for handling large transmit buffers > > > but does not trigger on: > > commit 8ca76151d2c8219edea82f1925a2a25907ff6a9d > Author: Will Deacon > Date: Thu Jul 17 10:01:15 2025 +0100 > > vsock/virtio: Rename virtio_vsock_skb_rx_put() > > > > Will, I suspect your patch merely uncovers a latent bug > in zero copy handling elsewhere. > Want to take a look? Sorry for the delay, I was debugging something else! I see Hillf already tried some stuff in the other thread, but I can take a look as well. Will