netdev - RE: net-next: 2.6.34-rc1 regression: panic when running diagnostic on interface with IPv6

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Date:	Mon, 5 Apr 2010 20:37:23 -0600
From:	"Tantilov, Emil S" <emil.s.tantilov@...el.com>
To:	Stephen Hemminger <shemminger@...tta.com>
CC:	David Miller <davem@...emloft.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: RE: net-next: 2.6.34-rc1 regression: panic when running diagnostic
 on interface with IPv6

Stephen Hemminger wrote:
> On Mon, 5 Apr 2010 17:50:38 -0600
> "Tantilov, Emil S" <emil.s.tantilov@...el.com> wrote:
> 
>> David Miller wrote:
>>> From: "Tantilov, Emil S" <emil.s.tantilov@...el.com>
>>> Date: Mon, 5 Apr 2010 17:03:56 -0600
>>> 
>>>> David Miller wrote:
>>>>> From: "Tantilov, Emil S" <emil.s.tantilov@...el.com>
>>>>> Date: Tue, 23 Mar 2010 12:28:08 -0600
>>>>> 
>>>>>> Bisecting points to this patch:
>>>>>> http://git.kernel.org/?p=linux/kernel/git/davem/net-next-2.6.git;a=commitdiff;h=84e8b803f1e16f3a2b8b80f80a63fa2f2f8a9be6
>>>>>> 
>>>>>> And I confirmed that the issue goes away after reverting it.
>>>>>> 
>>>>>> Steps to reproduce:
>>>>>> 1. Load the driver and configure IPv6 address.
>>>>>> 2. Run ethtool diag:
>>>>>> ethtool -t eth0
>>>>>> 
>>>>>> 3. If this doesn't brake it try again, or just do ifdown/up.
>>>>>> Other operations on the interface will eventually panic the
>>>>>> system: 
>>>>> 
>>>>> Stephen please fix this, thanks.
>>>> 
>>>> Just FYI - I still see this issue with latest pull from net-2.6.
>>> 
>>> It's net-next-2.6 that introduced the problem and has the follow-on
>>> fixes, not net-2.6
>> 
>> Same in net-next:
>> 
>> [   55.706583] WARNING: at net/ipv6/ip6_fib.c:1170
>> fib6_del+0x44/0x39f [ipv6]() [   55.714851] Hardware name: S5520HC
>> [   55.719037] Modules linked in: ipv6 e1000e e1000
>> [   55.724866] Pid: 5599, comm: ifconfig Not tainted
>> 2.6.34-rc1-net-next-e1000e-040510 #9 [   55.734418] Call Trace: [  
>> 55.737540]  [<ffffffff81033a3e>] ? __wake_up+0x43/0x50 [  
>> 55.743773]  [<ffffffffa006cb4e>] ? fib6_del+0x44/0x39f [ipv6] [  
>> 55.750687]  [<ffffffff81038b1e>] warn_slowpath_common+0x77/0x8f [  
>> 55.757793]  [<ffffffff81038b45>] warn_slowpath_null+0xf/0x11 [  
>> 55.764608]  [<ffffffffa006cb4e>] fib6_del+0x44/0x39f [ipv6] [  
>> 55.771314]  [<ffffffffa006a13b>] __ip6_del_rt+0x49/0x68 [ipv6] [  
>> 55.778319]  [<ffffffffa006a2aa>] ip6_del_rt+0x38/0x3a [ipv6] [  
>> 55.785136]  [<ffffffffa0065573>] __ipv6_ifa_notify+0x141/0x17d
>> [ipv6] [   55.792816]  [<ffffffffa00660a4>]
>> addrconf_ifdown+0x1ed/0x2cb [ipv6] [   55.800300] 
>> [<ffffffffa0067126>] addrconf_notify+0x705/0x7b6 [ipv6] [  
>> 55.807788]  [<ffffffff810456ce>] ? spin_unlock_irqrestore+0x9/0xb [ 
>> 55.815088]  [<ffffffff81045b80>] ? __mod_timer+0x125/0x137 [  
>> 55.821703]  [<ffffffff8144eb60>] ? _raw_write_unlock_bh+0x12/0x14 [ 
>> 55.828995]  [<ffffffff8103e37d>] ? local_bh_enable_ip+0x9/0xb [  
>> 55.835906]  [<ffffffff8144ec75>] ? _raw_spin_unlock_bh+0x12/0x14 [  
>> 55.843109]  [<ffffffffa006ca9b>] ? fib6_run_gc+0xca/0xcf [ipv6] [  
>> 55.850213]  [<ffffffff81451b29>] notifier_call_chain+0x33/0x5b [  
>> 55.857216]  [<ffffffff81055575>] __raw_notifier_call_chain+0x9/0xb [
>> 55.864604]  [<ffffffff81055586>] raw_notifier_call_chain+0xf/0x11 [ 
>> 55.871901]  [<ffffffff81397d8f>] call_netdevice_notifiers+0x16/0x18
>> [   55.879390]  [<ffffffff81397eb2>] __dev_notify_flags+0x35/0x59 [ 
>> 55.886293]  [<ffffffff81397f1c>] dev_change_flags+0x46/0x52 [  
>> 55.893007]  [<ffffffff813f0844>] devinet_ioctl+0x27f/0x54b [  
>> 55.899614]  [<ffffffff813f2c18>] inet_ioctl+0x8a/0xa2 [   55.905733]
>> [<ffffffff81387275>] sock_do_ioctl+0x26/0x46 [   55.912149] 
>> [<ffffffff81387490>] sock_ioctl+0x1fb/0x20e [   55.918461] 
>> [<ffffffff810e7b4b>] vfs_ioctl+0x2a/0x9d [   55.924495] 
>> [<ffffffff810e80c2>] do_vfs_ioctl+0x48c/0x4dd [   55.930999] 
>> [<ffffffff810e816a>] sys_ioctl+0x57/0x7a [   55.937033] 
>> [<ffffffff81002a2b>] system_call_fastpath+0x16/0x1b [   55.944123]
>> ---[ end trace c1c390412f982fb6 ]--- [   55.949677] Freeing alive
>> inet6 address ffff8801eee32000 [   56.034060] fib6_clean_node: del
>> failed: rt=ffff8801ec984e00@(null) err=-2  
>> 
> 
> Which driver is this, the test function is driver dependent?

I have seen the panic with e1000e and bnx2. 

Emil--
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