From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tony Lindgren Subject: Re: Regression: SUNRPC: Use poll() to fix up the socket requeue races Date: Tue, 26 Feb 2019 10:33:40 -0800 Message-ID: <20190226183340.GD39872@atomide.com> References: <95702994-6762-e42b-06ee-ae945c2137bd@nvidia.com> <88677895-7f89-ae1d-3060-819f4b04f530@nvidia.com> <9b9a6c5e34edea13b3ace42d39d97c27fd21c0db.camel@hammerspace.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <9b9a6c5e34edea13b3ace42d39d97c27fd21c0db.camel@hammerspace.com> Sender: linux-kernel-owner@vger.kernel.org To: Trond Myklebust Cc: "jonathanh@nvidia.com" , "linux-kernel@vger.kernel.org" , "linux-nfs@vger.kernel.org" , "linux-tegra@vger.kernel.org" List-Id: linux-tegra@vger.kernel.org Hi, * Trond Myklebust [700101 00:00]: > On Mon, 2019-02-25 at 22:27 +0000, Jon Hunter wrote: > > On 25/02/2019 21:03, Trond Myklebust wrote: > > This is nfsroot. I don't specify any particular NFS version from > > the kernel cmdline, but this is seen with ARM kernel configs > > tegra_defconfig and multi_v7_defconfig. > > > > Looking at the logs I am seeing the following crash which appears > > to point to UDP ... > > > > [ 8.032956] Unable to handle kernel NULL pointer dereference at > > virtual address 00000024 > > [ 8.041137] pgd = (ptrval) > > [ 8.043858] [00000024] *pgd=00000000 > > [ 8.047437] Internal error: Oops: 5 [#1] SMP ARM > > [ 8.052049] Modules linked in: > > [ 8.055104] CPU: 1 PID: 100 Comm: kworker/u9:2 Not tainted 5.0.0- > > rc7-next-20190222-g94a4752 #1 > > [ 8.063699] Hardware name: NVIDIA Tegra SoC (Flattened Device > > Tree) > > [ 8.069960] Workqueue: xprtiod xs_udp_data_receive_workfn > > [ 8.075353] PC is at udp_poll+0x30/0x64 > > [ 8.079178] LR is at udp_poll+0x10/0x64 > > Thanks! I see what the issue is now and I'll be fixing it ASAP. I'm seeing this also with NFSroot. I can test the fix when available, that is if you can please Cc me on the fix. Thanks, Tony