linux-kernel - [bisected] Re: WARNING: at net/ipv4/devinet.c:1599

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Date:	Tue, 4 Feb 2014 15:19:52 +0100
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	"David S. Miller" <davem@...emloft.net>,
	Jiri Pirko <jiri@...nulli.us>
Cc:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [bisected] Re: WARNING: at net/ipv4/devinet.c:1599

On Sun, Jan 26, 2014 at 10:56 AM, Geert Uytterhoeven
<geert@...ux-m68k.org> wrote:
> On m68k/ARAnyM:
>
> WARNING: CPU: 0 PID: 407 at net/ipv4/devinet.c:1599 0x316a99()
> Modules linked in:
> CPU: 0 PID: 407 Comm: ifconfig Not tainted
> 3.13.0-atari-09263-g0c71d68014d1 #1378
> Stack from 10c4fdf0:
>         10c4fdf0 002ffabb 000243e8 00000000 008ced6c 00024416 00316a99 0000063f
>         00316a99 00000009 00000000 002501b4 00316a99 0000063f c0a86117 00000080
>         c0a86117 00ad0c90 00250a5a 00000014 00ad0c90 00000000 00000000 00000001
>         00b02dd0 00356594 00000000 00356594 c0a86117 eff6c9e4 008ced6c 00000002
>         008ced60 0024f9b4 00250b52 00ad0c90 00000000 00000000 00252390 00ad0c90
>         eff6c9e4 0000004f 00000000 00000000 eff6c9e4 8000e25c eff6c9e4 80001020
> Call Trace: [<000243e8>] warn_slowpath_common+0x52/0x6c
>  [<00024416>] warn_slowpath_null+0x14/0x1a
>  [<002501b4>] rtmsg_ifa+0xdc/0xf0
>  [<00250a5a>] __inet_insert_ifa+0xd6/0x1c2
>  [<0024f9b4>] inet_abc_len+0x0/0x42
>  [<00250b52>] inet_insert_ifa+0xc/0x12
>  [<00252390>] devinet_ioctl+0x2ae/0x5d6
>  [<00020000>] _060_fpsp_effadd+0xc90c/0xd518
>  [<00020000>] _060_fpsp_effadd+0xc90c/0xd518
>  [<002530ec>] inet_ioctl+0x120/0x14e
>  [<00008916>] atari_scc_console_write+0x42/0x5c
>  [<00008916>] atari_scc_console_write+0x42/0x5c
>  [<001f7666>] sock_ioctl+0x56/0x256
>  [<00008916>] atari_scc_console_write+0x42/0x5c
>  [<00095434>] vfs_ioctl+0x1c/0x30
>  [<00008916>] atari_scc_console_write+0x42/0x5c
>  [<0009559c>] do_vfs_ioctl+0x7a/0x3b8
>  [<00008916>] atari_scc_console_write+0x42/0x5c
>  [<00002884>] buserr+0x20/0x28
>  [<00008916>] atari_scc_console_write+0x42/0x5c
>  [<00095910>] SyS_ioctl+0x36/0x5a
>  [<00008916>] atari_scc_console_write+0x42/0x5c
>  [<00008916>] atari_scc_console_write+0x42/0x5c
>  [<00002980>] syscall+0x8/0xc
>  [<00008916>] atari_scc_console_write+0x42/0x5c
>  [<0010c00b>] mext_leaf_block+0x443/0x81e
>
> ---[ end trace 44b14c97c2210758 ]---
>
> Adding some debugging code reveals that net_fill_ifaddr() fails in
>
>     put_cacheinfo(skb, ifa->ifa_cstamp, ifa->ifa_tstamp,
>                               preferred, valid))
>
> nla_put complains:
>
> lib/nlattr.c:454: skb_tailroom(skb) = 12, nla_total_size(attrlen) = 20

Bisected to:

commit ad6c81359fc3e6086d1d6f91acda9d5d0e64b2c3
Author: Jiri Pirko <jiri@...nulli.us>
Date:   Sun Dec 8 12:16:10 2013 +0100

    ipv4: add support for IFA_FLAGS nl attribute

    Signed-off-by: Jiri Pirko <jiri@...nulli.us>
    Signed-off-by: David S. Miller <davem@...emloft.net>

Reverting that commit on v3.14-rc1 fixes the problem.

I don't know why it fails. My first guess was the alignment of ifa_flags
(on m68k __u32 is aligned to 2 bytes, so there's no implicit padding):

        __be32                  ifa_broadcast;
        unsigned char           ifa_scope;
        unsigned char           ifa_prefixlen;
        __u32                   ifa_flags;

but adding 2 bytes of explicit alignment didn't help.

Anyone with a clue?

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds
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