Re: Regression: SUNRPC: Use poll() to fix up the socket requeue races
From: Tony Lindgren
Date: Tue Feb 26 2019 - 13:33:46 EST
* Trond Myklebust <trondmy@xxxxxxxxxxxxxxx> [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]  *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.