On Sun, 3 Aug 2008, Krzysztof Oledzki wrote:

quoted text
>
>
> On Sun, 3 Aug 2008, Arjan van de Ven wrote:
>
>> The warning below started showing up on kerneloops.org in the top 20 and=
 it=20
quoted text
>> appears to
>> be new in 2.6.27-rc (e.g. a regression)...
>>=20
>> It happens when nf_conntrack is rmmod'd
>>=20
>>=20
>> The reports:
>> http://www.kerneloops.org/search.php?search=3Dnf_conntrack_acct_fini
>>=20
>> The warning:
>>=20
>> WARNING: at kernel/sysctl.c:1966 unregister_sysctl_table+0xcc/0x103()
>>=20
>> Modules : nf_conntrack(-)
>>=20
>> Call Trace:
>> [<ffffffff81043bc8>] warn_on_slowpath+0x65/0x98
>> [<ffffffff8104abdf>] unregister_sysctl_table+0xcc/0x103
>> [<ffffffffa0306655>] nf_conntrack_acct_fini+0x15/0x23 [nf_conntrack]
>> [<ffffffffa03018a1>] nf_conntrack_cleanup+0x84/0x86 [nf_conntrack]
>> [<ffffffffa0306944>] nf_conntrack_standalone_fini+0x40/0x42 [nf_conntrac=
k]
quoted text
>> [<ffffffff810700d0>] sys_delete_module+0x202/0x263
>> [<ffffffff8101034a>] system_call_fastpath+0x16/0x1b
>
> Thanks. It seems I'm the person who introduced it. I'll look at it ASAP.

Probably spoken too fast. This problem was introduced in 2.6.26-git15,=20
about one week after my accounting rework had been included. Obviously=20
there is something wrong with netfilter sysctl handling as starting with=20
this kernel version sysctl reports duplicated net.netfilter:

# find /proc/sys/net/|grep net/netf
/proc/sys/net/netfilter
/proc/sys/net/netfilter/nf_conntrack_generic_timeout
/proc/sys/net/netfilter/nf_conntrack_acct
/proc/sys/net/netfilter
/proc/sys/net/netfilter/nf_conntrack_generic_timeout
/proc/sys/net/netfilter/nf_conntrack_acct

# sysctl -a|grep net.netfilter
net.netfilter.nf_conntrack_generic_timeout =3D 600
net.netfilter.nf_conntrack_acct =3D 1
net.netfilter.nf_conntrack_generic_timeout =3D 600
net.netfilter.nf_conntrack_acct =3D 1

Still investigating.

Best regards,

 =09=09=09=09Krzysztof Ol=EAdzki