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Date: Sun, 13 Nov 2016 17:47:00 -0800
From: Eric Dumazet <eric.dumazet@...il.com>
To: kernel test robot <xiaolong.ye@...el.com>
Cc: lkp@...org, netdev <netdev@...r.kernel.org>,
Willem de Bruijn <willemb@...gle.com>,
Alexei Starovoitov <ast@...nel.org>,
Alexander Duyck <alexander.h.duyck@...el.com>,
Jojy Varghese <jojvargh@...co.com>,
Tom Herbert <tom@...bertland.com>,
Yibin Yang <yibyang@...co.com>,
David Miller <davem@...emloft.net>
Subject: Re: [net] 2ab9fb18c4: kernel BUG at include/linux/skbuff.h:1935!
On Mon, 2016-11-14 at 07:49 +0800, kernel test robot wrote:
> FYI, we noticed the following commit:
> in testcase: kbuild
> with following parameters:
>
> runtime: 300s
> nr_task: 50%
> cpufreq_governor: performance
>
>
>
>
> on test machine: 8 threads Intel(R) Atom(TM) CPU C2750 @ 2.40GHz with 16G memory
>
> caused below changes:
>
>
> +-------------------------------------------------------+------------+------------+
> | | cdb26d3387 | 2ab9fb18c4 |
> +-------------------------------------------------------+------------+------------+
> | boot_successes | 10 | 3 |
> | boot_failures | 0 | 9 |
> | kernel_BUG_at_include/linux/skbuff.h | 0 | 8 |
> | invalid_opcode:#[##]SMP | 0 | 8 |
> | RIP:eth_type_trans | 0 | 8 |
> | Kernel_panic-not_syncing:Fatal_exception_in_interrupt | 0 | 5 |
> | WARNING:at_fs/sysfs/dir.c:#sysfs_warn_dup | 0 | 1 |
> | calltrace:parport_pc_init | 0 | 1 |
> | calltrace:SyS_finit_module | 0 | 1 |
> | WARNING:at_lib/kobject.c:#kobject_add_internal | 0 | 1 |
> +-------------------------------------------------------+------------+------------+
>
>
>
> [ 20.491020] IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
> [ 20.502988] Sending DHCP requests .
> [ 20.506729] ------------[ cut here ]------------
> [ 20.511369] kernel BUG at include/linux/skbuff.h:1935!
> [ 20.517893] invalid opcode: 0000 [#1] SMP
> [ 20.521902] Modules linked in:
> [ 20.524979] CPU: 4 PID: 0 Comm: swapper/4 Not tainted 4.9.0-rc3-00286-g2ab9fb1 #1
> [ 20.532463] Hardware name: Supermicro SYS-5018A-TN4/A1SAi, BIOS 1.1a 08/27/2015
> [ 20.539768] task: ffff8804456c2480 task.stack: ffffc90001920000
> [ 20.545684] RIP: 0010:[<ffffffff81837b48>] [<ffffffff81837b48>] eth_type_trans+0xe8/0x140
> [ 20.553972] RSP: 0018:ffff88047fd03db8 EFLAGS: 00010297
> [ 20.559283] RAX: 0000000000000158 RBX: ffff88047d8ae600 RCX: 0000000000001073
> [ 20.566415] RDX: ffff88047bf07dc0 RSI: ffff88047d8a4000 RDI: ffff88047dac0f00
> [ 20.573546] RBP: ffff88047fd03e20 R08: ffff88047d8a4000 R09: 0000000000000800
> [ 20.580678] R10: ffff88047bf07ec0 R11: ffffea0011f6e400 R12: ffff88047dac0f00
> [ 20.587810] R13: ffff880457413000 R14: ffffc90002129000 R15: 000000000000015e
> [ 20.594946] FS: 0000000000000000(0000) GS:ffff88047fd00000(0000) knlGS:0000000000000000
> [ 20.603032] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [ 20.608775] CR2: 00007fffadfb4ef0 CR3: 000000047ee07000 CR4: 00000000001006e0
> [ 20.615906] Stack:
> [ 20.617927] ffffffff816905a7 ffffea0011f6e400 ffffea0000000008 ffff88047d8ae450
> [ 20.625403] ffff88047d8ae400 0000004000000166 ffffea0011f6e400 0000ffff00000000
> [ 20.632873] 0000000000000040 0000000000000000 ffff88047d8ae450 ffff88047d8b1140
> [ 20.640352] Call Trace:
> [ 20.642805] <IRQ>
> [ 20.644740] [<ffffffff816905a7>] ? igb_clean_rx_irq+0x6a7/0x7d0
> [ 20.650760] [<ffffffff81690a52>] igb_poll+0x382/0x700
> [ 20.655904] [<ffffffff8146edd9>] ? timerqueue_add+0x59/0xb0
> [ 20.661564] [<ffffffff8180f2d7>] net_rx_action+0x217/0x360
> [ 20.667137] [<ffffffff81957ef4>] __do_softirq+0x104/0x2ab
> [ 20.672624] [<ffffffff81086961>] irq_exit+0xf1/0x100
> [ 20.677673] [<ffffffff81957c34>] do_IRQ+0x54/0xd0
> [ 20.682466] [<ffffffff81955acc>] common_interrupt+0x8c/0x8c
> [ 20.688123] <EOI>
> [ 20.690054] [<ffffffff817c1d12>] ? cpuidle_enter_state+0x122/0x2e0
> [ 20.696333] [<ffffffff817c1f07>] cpuidle_enter+0x17/0x20
> [ 20.701733] [<ffffffff810c64c3>] call_cpuidle+0x23/0x40
> [ 20.707045] [<ffffffff810c66f4>] cpu_startup_entry+0x114/0x200
> [ 20.712964] [<ffffffff81051c87>] start_secondary+0x107/0x130
> [ 20.718708] Code: 00 04 00 00 c9 c3 48 33 86 70 03 00 00 48 c1 e0 10 48 85 c0 0f b6 87 90 00 00 00 75 28 83 e0 f8 83 c8 01 88 87 90 00 00 00 eb 82 <0f> 0b 0f b6 87 90 00 00 00 83 e0 f8 83 c8 03 88 87 90 00 00 00
> [ 20.738722] RIP [<ffffffff81837b48>] eth_type_trans+0xe8/0x140
> [ 20.744662] RSP <ffff88047fd03db8>
> [ 20.748160] ---[ end trace 153440bf1ca2e6fc ]---
> [ 20.748165] ------------[ cut here ]------------
>
>
> To reproduce:
>
> git clone git://git.kernel.org/pub/scm/linux/kernel/git/wfg/lkp-tests.git
> cd lkp-tests
> bin/lkp install job.yaml # job file is attached in this email
> bin/lkp run job.yaml
>
>
>
> Thanks,
> Kernel Test Robot
Hi guys.
I took a look at the commit again and I do not see how this can happen.
Are you sure patch was properly applied ?
In particular, the following extract is obscure for me :
> https://github.com/0day-ci/linux Eric-Dumazet/net-__skb_flow_dissect-must-cap-its-return-value/20161110-080839
> commit 2ab9fb18c46b91b16a0f0f329336d3be9fc32deb ("net: __skb_flow_dissect() must cap its return value")
>
Thanks.
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