netdev - [bisected] Weird sysctl regression

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Date:	Thu, 21 Aug 2008 09:18:48 +0200
From:	arno@...isbad.org (Arnaud Ebalard)
To:	netdev@...r.kernel.org
Cc:	Al Viro <viro@...iv.linux.org.uk>,
	David Miller <davem@...emloft.net>
Subject:  [bisected] Weird sysctl regression

Hi,

While updating some IPv6-related patches for net-2.6, I hit the
following issue on a test laptop (G4-based 12" powerbook). After
compiling current net-2.6 kernel on another ppc device (G4-based 15"
powerbook), I have the same issue. Note that:

- it never shows up on any of the x86 devices I have.
- hardware of both ppc devices are similar (bcm4306, sungem, ...)
  i.e. they do not only have endianness in common (and i had no sparc
  device to test if it is an endianness issue or a coincidence)

Usually, I have the following on those devices:

arno@...it:~$ ls /proc/sys/net/
bridge  core  ipv4  ipv6  netfilter  nf_conntrack_max  unix
arno@...it:~$ ls /proc/sys/net/ipv6
bindv6only  conf  icmp  ip6frag_high_thresh  ip6frag_low_thresh  ip6frag_secret_interval  ip6frag_time  ip6_queue_maxlen  mld_max_msf  neigh  route

But with current net-2.6, I have:

arno@...it:~$ ls /proc/sys/net/
bridge  core  ipv4  ipv6  ipv6  netfilter  nf_conntrack_max  unix
arno@...it:~$ ls /proc/sys/net/ipv6/
ip6_queue_maxlen

i.e. ipv6 is there twice (sometimes even three times), and most of the
keys I expect to find here have vanished.

I bisected it to 9043476f726802f4b00c96d0c4f418dde48d1304 ([PATCH]
sanitize proc_sysctl) which is in the middle of a set of fs/sysctl
related patches.

My kernel config is attached and I can do additional tests if you need
(today or on sunday; I may be unresponsive tomorrow and the day after).

Cheers,

a+

View attachment "dot-config.txt" of type "text/plain" (53825 bytes)