netdev - Re: [PATCH net-next 1/8] flow_keys: Record IP layer protocol in skb_flow

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Date:	Thu, 26 Jun 2014 12:04:01 +0530 (IST)
From:	Govindarajulu Varadarajan <_govind@....com>
To:	Yinghai Lu <yinghai@...nel.org>
cc:	Govindarajulu Varadarajan <_govind@....com>,
	David Miller <davem@...emloft.net>,
	NetDev <netdev@...r.kernel.org>, ssujith@...co.com,
	gvaradar@...co.com, benve@...co.com
Subject: Re: [PATCH net-next 1/8] flow_keys: Record IP layer protocol in
 skb_flow_dissect()


On Mon, 23 Jun 2014, Yinghai Lu wrote:
> this patch in net-next cause kernel crash.
>
> [  148.466045] qlge 0000:4a:00.1 eth27: Passed Get Port Configuration.
> [  162.385445] BUG: unable to handle kernel paging request at 000000010000007e
> [  162.385839] IP: [<ffffffff81f18899>] __dev_queue_xmit+0x399/0x630
> [  162.398541] PGD 0
> [  162.398659] Oops: 0002 [#1] SMP
> [  162.398845] Modules linked in:
> [  162.399022] CPU: 5 PID: 1 Comm: swapper/0 Tainted: G        W
> 3.16.0-rc2-yh-00302-g3d5dc41-dirty #22
> [  162.418490] Hardware name: Oracle Corporation  unknown       /
> , BIOS 11016600    05/17/2011
> [  162.438851] task: ffff884027a80000 ti: ffff881027d20000 task.ti:
> ffff881027d20000
> [  162.468329] RIP: 0010:[<ffffffff81f18899>]  [<ffffffff81f18899>]
> __dev_queue_xmit+0x399/0x630
> [  162.488085] RSP: 0000:ffff881027d23d28  EFLAGS: 00010202
> [  162.488345] RAX: 00000000fffffffe RBX: ffff887026041000 RCX: 0000000000000001
> [  162.508245] RDX: 0000000000000000 RSI: ffffffff82dfee78 RDI: ffff884027a80000
> [  162.508590] RBP: ffff881027d23d70 R08: 0000000000000001 R09: 0000000000000000
> [  162.528255] R10: 0000000000000000 R11: ffff885026020800 R12: ffffffff82dfedc0
> [  162.547963] R13: ffff881022b7c000 R14: 0000000000000dac R15: ffff88702434c400
> [  162.548310] FS:  0000000000000000(0000) GS:ffff88103f000000(0000)
> knlGS:0000000000000000
> [  162.568186] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
> [  162.568489] CR2: 000000010000007e CR3: 0000000002c19000 CR4: 00000000000007e0
> [  162.588263] Stack:
> [  162.588354]  ffffffff81f18505 0000000000000000 00ff881027d23d80
> ffffffff82dfee60
> [  162.608269]  ffff885023dd1e40 ffff881022b7c000 ffff885026020929
> 0000000000000dac
> [  162.628043]  ffff887026041000 ffff881027d23d80 ffffffff81f18b40
> ffff881027d23e18
> [  162.628422] Call Trace:
> [  162.647963]  [<ffffffff81f18505>] ? __dev_queue_xmit+0x5/0x630
> [  162.648284]  [<ffffffff81f18b40>] dev_queue_xmit+0x10/0x20
> [  162.667987]  [<ffffffff83087b64>] ip_auto_config+0x8e6/0xf13
> [  162.668282]  [<ffffffff8100031d>] ? do_one_initcall+0xdd/0x1e0
> [  162.688018]  [<ffffffff810e36ad>] ? trace_hardirqs_on+0xd/0x10
> [  162.688298]  [<ffffffff8110c40f>] ? ktime_get+0xbf/0x140
> [  162.708029]  [<ffffffff8308727e>] ? root_nfs_parse_addr+0xbd/0xbd
> [  162.708292]  [<ffffffff81000323>] do_one_initcall+0xe3/0x1e0
> [  162.728075]  [<ffffffff810ba8bd>] ? parse_args+0x1ed/0x330
> [  162.728340]  [<ffffffff8203501a>] ? printk+0x54/0x56
> [  162.748027]  [<ffffffff8301f4c5>] kernel_init_freeable+0x237/0x2ce
> [  162.748344]  [<ffffffff8301eaf7>] ? do_early_param+0x8a/0x8a
> [  162.768070]  [<ffffffff8202abb0>] ? rest_init+0xc0/0xc0
> [  162.768318]  [<ffffffff8202abbe>] kernel_init+0xe/0x100
> [  162.788057]  [<ffffffff8204c4ac>] ret_from_fork+0x7c/0xb0
> [  162.788314]  [<ffffffff8202abb0>] ? rest_init+0xc0/0xc0
> [  162.808008] Code: e8 5d 48 18 ff eb 13 48 c7 c7 60 d9 c5 82 e8 cf
> bc 1c ff 85 c0 74 dd 0f 1f 00 48 8b 43 58 48 83 e0 fe 48 85 c0 48 89
> 43 58 74 07 <f0> ff 80 80 00 00 00 4c 89 e6 48 89 df 41 ff 14 24 41 89
> c6 41
> [  162.828797] RIP  [<ffffffff81f18899>] __dev_queue_xmit+0x399/0x630
> [  162.848186]  RSP <ffff881027d23d28>
> [  162.848341] CR2: 000000010000007e
> [  162.848490] ---[ end trace 26b7736a09036e46 ]---
> [  162.868194] Kernel panic - not syncing: Fatal exception in interrupt
> [  162.872673] Kernel Offset: 0x0 from 0xffffffff81000000 (relocation
> range: 0xffffffff80000000-0xffffffff9fffffff)
> [  162.888531] ---[ end Kernel panic - not syncing: Fatal exception in interrupt
> [  162.908306] ------------[ cut here ]------------
>
> After the commit is reverted, the system work again.

I do not see any problem in my system.

Did you try disecting what "__dev_queue_xmit+0x399/0x630" is?

On what interface did the crash occur on? is it bond interface?

Thanks
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