netdev - Re: 3.3.0, 3.4-rc1 reproducible tun Oops

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Date:	Thu, 05 Apr 2012 04:41:04 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Simon Kirby <sim@...tway.ca>
Cc:	netdev@...r.kernel.org
Subject: Re: 3.3.0, 3.4-rc1 reproducible tun Oops

On Wed, 2012-04-04 at 15:05 -0700, Simon Kirby wrote:
> I use an SSH VPN occasionally from home, and since upgrading the
> remote
> kernel to 3.3.0, the it now seems to Oops when I ^C the tunnel with
> sockets still active. If I start the tunnel, log in to a box through
> it
> and run "vmstat 1", ^C the tunnel SSH process, and start it up again,
> I
> get an Oops like this:
> 
> BUG: unable to handle kernel NULL pointer dereference at
> 00000000000000ff
> IP: [<ffffffff810ed5fa>] __kmalloc_track_caller+0xaa/0x1b0
> PGD 12d2bc067 PUD 0
> Oops: 0000 [#1] SMP
> CPU 1
> Modules linked in: nf_conntrack_netlink nfnetlink iptable_mangle
> ipt_MASQUERADE xt_state xt_conntrack iptable_nat nf_nat
> nf_conntrack_ipv4 nf_defrag_ipv4 nf_conntrack hwmon_vid ppp_async
> ppp_generic slhc crc_ccitt tun nvidia(PO) uvcvideo videobuf2_vmalloc
> videobuf2_memops videobuf2_core e100
> 
> Pid: 16156, comm: sshd Tainted: P           O 3.3.0 #32 System
> manufacturer System Product Name/A8N-VM CSM

Hmm, is it happening if you remove the nvidia module ?

If yes, please try to add slub_debug=FZPU

CONFIG_SLUB_DEBUG=y
CONFIG_SLUB=y
# CONFIG_SLUB_DEBUG_ON is not set



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