netdev - Fw: [Bug 52481] New: Occasional NULL pointer dereference during ftp networking since 3.7

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Date:	Thu, 10 Jan 2013 09:21:36 -0800
From:	Stephen Hemminger <shemminger@...tta.com>
To:	netdev@...r.kernel.org
Subject: Fw: [Bug 52481] New: Occasional NULL pointer dereference during ftp
 networking since 3.7

Begin forwarded message:

Date: Tue,  8 Jan 2013 14:29:18 +0000 (UTC)
From: bugzilla-daemon@...zilla.kernel.org
To: shemminger@...ux-foundation.org
Subject: [Bug 52481] New: Occasional NULL pointer dereference during ftp networking since 3.7

https://bugzilla.kernel.org/show_bug.cgi?id=52481

           Summary: Occasional NULL pointer dereference during ftp
                    networking since 3.7
           Product: Networking
           Version: 2.5
    Kernel Version: 3.7.0
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: IPV4
        AssignedTo: shemminger@...ux-foundation.org
        ReportedBy: itumaykin@...il.com
        Regression: Yes

Created an attachment (id=90771)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=90771)
lspci -vvv

I am experiencing occasional panics during ftp networking after installing
kernel 3.7.0.

I have vsftpd-3.0.2 up and running on port 21 with configuration not changed
for months, I use passive FTP with nf_conntrack_ftp helper. My distro is
Hardened Gentoo amd64 and I use not vanilla kernel, but with some Gentoo
specific and grsec specific patches.

Anyway, with kernel 3.5.4 I had no problems with my FTP at all, but with 3.7.0
there are random panics during or after FTP sessions. It happens more often
after sessions with lots of data transferred, but sometimes only `ls` is enough
to hang my machine.
The nature of these errors is unknown to me, but the issue is definetely within
the kernel as I tried to downgrade solely kernel back to 3.5.4 and everything
returned back to normal.

Also, I don't have traces of these panics in my logs, but I took photos of one
of such cases. Here are links to them:
https://docs.google.com/folder/d/0B9NAm8_0mptgU2RrMTZWX0NucUk/edit

I understand there is probably not enough info to investigate the source of
this issue, but I am ready to provide any additional info or do some testing.

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