netdev - Re: unable to handle paging request, arm, at aio/tcp code, only 3.6

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Message-ID: <20121119211020.GL2068@vicerveza.homeunix.net>
Date:	Mon, 19 Nov 2012 22:10:20 +0100
From:	Lluís Batlle i Rossell <viric@...ic.name>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	netdev@...r.kernel.org
Subject: Re: unable to handle paging request, arm, at aio/tcp code, only 3.6

On Mon, Nov 19, 2012 at 11:41:35AM -0800, Eric Dumazet wrote:
> On Mon, 2012-11-19 at 19:32 +0100, Lluís Batlle i Rossell wrote:
> > (crosspost from lkml)
> > Hello,
> > 
> > in a Sheevaplug (armv5tel), if I run the kernels 3.6.3 or 3.6.6, they crash in
> > less than 48h. Kernel 3.5.3 runs perfect, as most previous kernels I've been
> > running until 2.6.36.
> > 
> > Can anyone suggest what change can be the cause of that?
> > Or how could I debug this to fix it?
> > 
> > Here is the panic:
> > unable to handle kernel paging request at virtual address ffffffab
> > pgd = d864c000
> > [ffffffab] *pgd=1fffe831, *pte=00000000, *ppte=00000000
> > Internal error: Oops: 1 [#1] PREEMPT ARM
> > Modules linked in: netconsole cbc sg cryptodev(O) fuse ipv6 ums_cypress dm_mod btrfs ext4 jb
> > d2 reiserfs [last unloaded: netconsole]
> > CPU: 0    Tainted: G           O  (3.6.6 #1)
> > PC is at tcp_v6_mtu_reduced+0x40/0x80 [ipv6]
> > LR is at ip6_dst_lookup_tail+0xd8/0xfc [ipv6]
> > pc : [<bf2b02f8>]    lr : [<bf28a67c>]    psr: a0000013
> > ...
> Thanks for the report.
> 
> I believe this is a regression of commit
> 35ad9b9cf7d8a2e6259a0d24022e910adb6f3489
> (ipv6: Add helper inet6_csk_update_pmtu().)
> 
> I'll prepare a patch to fix this.

If it can help, I keep the vmlinux kernel with debug info.

Regards,
Lluís.
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