netdev - Re: [PATCHv2 0/2] IPVS: Add Generic Netlink configuration interface

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Message-ID: <f4845fc0807251536l16cd6166gc62be740a14df93a@mail.gmail.com>
Date:	Sat, 26 Jul 2008 00:36:56 +0200
From:	"Julius Volz" <juliusv@...gle.com>
To:	"Simon Horman" <horms@...ge.net.au>
Cc:	"Vince Busam" <vbusam@...gle.com>, netdev@...r.kernel.org,
	lvs-devel@...r.kernel.org, kaber@...sh.net, davem@...emloft.net,
	tgraf@...g.ch
Subject: Re: [PATCHv2 0/2] IPVS: Add Generic Netlink configuration interface

On Fri, Jul 25, 2008 at 7:58 AM, Simon Horman <horms@...ge.net.au> wrote:
> On Wed, Jul 23, 2008 at 02:39:10PM -0700, Vince Busam wrote:
>> Vince Busam wrote:
>>> Simon Horman wrote:
>>>> I'm not an expert on netlink, but these patches are looking good to me.
>>>> Is the user-space portion available somewhere?
>>
>> Newer versions are available at
>> http://sixpak.org/vince/google/ipvsadm/
>
> Great, thanks :-)
>
> I have been playing with this a little today. I am able to configure
> a virtual service and it does work. However clearing seems to be a bit
> of a problem, as per the trace below.
>
> I am using the following code:
>
> linux-next-2.6 14b395e35d1afdd8019d11b92e28041fad591b71
> + [PATCH] IPVS: Move userspace definitions to include/linux/ip_vs.h
> + [PATCHv2 1/2] IPVS: Add genetlink interface definitions to ip_vs.h
> + [PATCHv2 2/2] IPVS: Add genetlink interface implementation
>
> I am running the code on i386 qemu running on an i386 machine.
>
> My ipvsadm is ipvsadm-1.25-nl-2 (statically linked).
> My libnl is Debian's libnl1 1.1-2 (rebuilt to provide a static version).
>
> # ipvsadm -A -t 10.4.0.132:80
> # ipvsadm -C
> # ipvsadm -A -t 10.4.0.132:80
> BUG: unable to handle kernel paging request at 44e30116
> IP: [<c01e8b34>] ctrl_dumpfamily+0xa4/0xbc
> *pde = 00000000
> Oops: 0000 [#1]
>
> Pid: 33, comm: ipvsadm Not tainted (2.6.26-kexec-05253-g14b395e-dirty #23)
> EIP: 0060:[<c01e8b34>] EFLAGS: 00000212 CPU: 0
> EIP is at ctrl_dumpfamily+0xa4/0xbc
> EAX: c6f8b560 EBX: c02ee14c ECX: c02ee178 EDX: 44e300c6
> ESI: c02ee108 EDI: 00000000 EBP: 00000010 ESP: c746dc48
>  DS: 007b ES: 007b FS: 0000 GS: 0033 SS: 0068
> Process ipvsadm (pid: 33, ti=c746c000 task=c6f20a50 task.ti=c746c000)
> Stack: 00000000 00000000 c6f8b560 c744e300 c744e260 c744e300 000000d0 c6faf000
>       c01e7073 00000020 0000000f ffffff97 c6f8b560 c744be00 c744e260 c6faf000
>       c6f8b560 00000000 c01e72c2 c6faf800 c0290ca0 c0290c60 c744e260 c01e83d2
> Call Trace:
>  [<c01e7073>] netlink_dump+0x53/0x1bc
>  [<c01e72c2>] netlink_dump_start+0xe6/0x118
>  [<c01e83d2>] genl_rcv_msg+0x112/0x174
>  [<c01e8a90>] ctrl_dumpfamily+0x0/0xbc
>  [<c018cd2e>] copy_to_user+0x2a/0x38
>  [<c01e82c0>] genl_rcv_msg+0x0/0x174
>  [<c01e7450>] netlink_rcv_skb+0x38/0x7c
>  [<c01e844d>] genl_rcv+0x19/0x24
>  [<c01e6290>] netlink_unicast+0x168/0x1a4
>  [<c01e6ad8>] netlink_sendmsg+0x1f8/0x260
>  [<c01cf7a6>] sock_sendmsg+0xb2/0xd8
>  [<c0121bf8>] autoremove_wake_function+0x0/0x30
>  [<c016126e>] simple_lookup+0x2a/0x30
>  [<c015064e>] real_lookup+0xa2/0xd4
>  [<c018cd65>] copy_from_user+0x29/0x4c
>  [<c018cd65>] copy_from_user+0x29/0x4c
>  [<c01d6586>] verify_iovec+0x32/0x7c
>  [<c01d0bcd>] sys_sendmsg+0x111/0x200
>  [<c0133429>] buffered_rmqueue+0x115/0x1e0
>  [<c0133643>] get_page_from_freelist+0x9f/0xf8
>  [<c0133733>] __alloc_pages_internal+0x97/0x3dc
>  [<c013c37f>] do_anonymous_page+0xa7/0xd0
>  [<c013c95c>] handle_mm_fault+0x154/0x1a0
>  [<c01d107e>] sys_socketcall+0x1a2/0x1ac
>  [<c0103db2>] syscall_call+0x7/0xb
>  =======================
> Code: 48 08 8b 02 8b 50 2c 6a 01 ff 74 24 10 6a 02 89 d8 e8 39 f9 ff ff 83 c4 0c 85 c0 79 c2 8b 44 24 08 89 68 14 89 78 18 8b 54 24 0b <8b> 42 50 83 c4 10 5b 5e 5f 5d c3 90 c7 04 24 00 00 00 00 e9 68
> EIP: [<c01e8b34>] ctrl_dumpfamily+0xa4/0xbc SS:ESP 0068:c746dc48
> ---[ end trace fe319f25bee8d956 ]---
> Segmentation fault
> #
> #

Thanks for reporting. I'm not in expert in interpreting these dumps,
but it seems like there is no IPVS code in the trace, only the Generic
Netlink functions? Thomas, is this correct?

I'm on vacation for two weeks now, but I am sure I tested exactly this
situation many times without an oops. Do you get this every time or
did this just happen once?

I use UML and not qemu, though.

Julius

-- 
Google Switzerland GmbH
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