netdev - NFS issue on v4.4-rc3

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Message-ID: <21970607.rdfIyEsdfn@avalon>
Date:	Sat, 05 Dec 2015 00:53:24 +0200
From:	Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:	linux-kernel@...r.kernel.org, linux-nfs@...r.kernel.org,
	netdev@...r.kernel.org
Subject: NFS issue on v4.4-rc3

Hello,

I ran into the following warning when running v4.4-rc3 on a TI OMAP4 
(pandaboard) using nfsroot.

[ 8063.208526] ------------[ cut here ]------------
[ 8063.213653] WARNING: CPU: 1 PID: 81 at net/ipv4/af_inet.c:155 
inet_sock_destruct+0x188/0x1dc()
[ 8063.213653] Modules linked in: vivid cfbfillrect cfbimgblt font 
videobuf2_dma_contig videobuf2_memops cfbcopyarea videobuf2_v4l2 
videobuf2_core fb omapdrm drm_kms_helper drm snd_soc_omap_abe_twl6040 e
[ 8063.253143] CPU: 1 PID: 81 Comm: kworker/1:1H Not tainted 4.4.0-rc3-00249-
g8555fa61a7ca-dirty #347
[ 8063.269317] Hardware name: Generic OMAP4 (Flattened Device Tree)
[ 8063.275634] Workqueue: rpciod xprt_autoclose
[ 8063.275634] [<c0016f4c>] (unwind_backtrace) from [<c0013238>] 
(show_stack+0x10/0x14)
[ 8063.288391] [<c0013238>] (show_stack) from [<c0341e68>] 
(dump_stack+0x80/0x9c)
[ 8063.296020] [<c0341e68>] (dump_stack) from [<c003c458>] 
(warn_slowpath_common+0x7c/0xb8)
[ 8063.296020] [<c003c458>] (warn_slowpath_common) from [<c003c4b0>] 
(warn_slowpath_null+0x1c/0x24)
[ 8063.313812] [<c003c4b0>] (warn_slowpath_null) from [<c05f4c18>] 
(inet_sock_destruct+0x188/0x1dc)
[ 8063.323059] [<c05f4c18>] (inet_sock_destruct) from [<c05679f8>] 
(sk_destruct+0x18/0x174)
[ 8063.331604] [<c05679f8>] (sk_destruct) from [<c05f4974>] 
(inet_release+0x44/0x70)
[ 8063.339508] [<c05f4974>] (inet_release) from [<c056167c>] 
(sock_release+0x20/0xb8)
[ 8063.347503] [<c056167c>] (sock_release) from [<c063ebac>] 
(xs_close+0xc/0x20)
[ 8063.355041] [<c063ebac>] (xs_close) from [<c063c0d4>] 
(xprt_autoclose+0x30/0x64)
[ 8063.362854] [<c063c0d4>] (xprt_autoclose) from [<c00559c4>] 
(process_one_work+0x1b4/0x4ac)
[ 8063.371551] [<c00559c4>] (process_one_work) from [<c0055e44>] 
(worker_thread+0x154/0x470)
[ 8063.380187] [<c0055e44>] (worker_thread) from [<c005bb88>] 
(kthread+0xd0/0xec)
[ 8063.387817] [<c005bb88>] (kthread) from [<c000f870>] 
(ret_from_fork+0x14/0x24)
[ 8063.395446] ---[ end trace 6ced06624a647c32 ]---

The problem occurred twice only over several hours and wasn't linked to any 
particular operation.

Before the first occurrence I also got errors printed right after boot on both 
the client and the server side kernel logs. The server side read as follows.

[72948.929645] oversized read request from 192.168.1.254, port=938 (1426618135 
bytes)
[72954.726793] oversized read request from 192.168.1.254, port=938 (67248960 
bytes)

I'm afraid the client messages have been lost in my scroll buffer, but they 
were related to the to oversized requests as well.

I've been running the same setup on v4.3 without any issue for quite a long 
time.

-- 
Regards,

Laurent Pinchart

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