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Message-Id: <20080218045812.f1dc6f71.akpm@linux-foundation.org>
Date: Mon, 18 Feb 2008 04:58:12 -0800
From: Andrew Morton <akpm@...ux-foundation.org>
To: Michael Tokarev <mjt@....msk.ru>
Cc: Kernel Mailing List <linux-kernel@...r.kernel.org>,
linux-nfs@...r.kernel.org
Subject: Re: 2.6.24: RPC: bad TCP reclen 0x00020090 (large)
(suitable cc added)
(regression)
On Wed, 13 Feb 2008 17:02:53 +0300 Michael Tokarev <mjt@....msk.ru> wrote:
> Hello!
>
> After upgrading to 2.6.24 (from .23), we're seeing ALOT
> of messages like in $subj in dmesg:
>
> Feb 13 13:21:39 paltus kernel: RPC: bad TCP reclen 0x00020090 (large)
> Feb 13 13:21:46 paltus kernel: printk: 3586 messages suppressed.
> Feb 13 13:21:46 paltus kernel: RPC: bad TCP reclen 0x00020090 (large)
> Feb 13 13:21:49 paltus kernel: printk: 371 messages suppressed.
> Feb 13 13:21:49 paltus kernel: RPC: bad TCP reclen 0x00020090 (large)
> Feb 13 13:21:55 paltus kernel: printk: 2979 messages suppressed.
> ...
>
> with linux NFS server. The clients are all linux too, mostly 2.6.23
> and some 2.6.22.
>
> I found the "offending" piece of code in net/sunrpc/svcsock.c,
> in routine svc_tcp_recvfrom() with condition being:
>
> if (svsk->sk_reclen > serv->sv_max_mesg) ...
>
> This happens after a server reboot. At this point, client(s) are trying
> to perform some NFS transaction and fail, and server starts generating
> the above messages - till I do a umount followed by mount on all clients.
> Before, such situation (nfs server reboot) were handled transparently,
> ie, there was nothing to do, the mount continued working just fine when
> the server comes back online.
>
> Now, I'm not sure if it's really 2.6.24-specific problem or a userspace
> problem. Some time ago we also upgraded nfs-kernel-server (Debian)
> package, and the remount-after-nfs-server-reboot problem started to
> occur at THAT time (and it is something to worry about as well, I just
> had no time to deal with it); but the dmesg spamming only appeared
> with 2.6.24.
>
> How to debug the issue further on from this point?
>
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