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Date: Mon, 02 Sep 2013 14:06:34 +0800
From: Baoquan He <baoquan.he@...il.com>
To: Hillf Danton <dhillf@...il.com>
CC: Cong Wang <xiyou.wangcong@...il.com>,
LKML <linux-kernel@...r.kernel.org>,
Linux Kernel Network Developers <netdev@...r.kernel.org>
Subject: Re: 3.11-rc7:BUG: soft lockup
Hi both,
Thanks for your patches. I tried to test your patches, first the 2nd
one, namely Hillf's patch, it's OK. Then when I wanted to reproduce and
test Cong's patch, it failed to happen again.
I remember this bug happened randomly at the very beginning,
just after kernel compiling it always happened one day.
So maybe when it happened again, I will test your patch separately.
Baoquan
Thanks
On 08/31/2013 11:25 AM, Hillf Danton wrote:
> On Fri, Aug 30, 2013 at 8:18 PM, Cong Wang <xiyou.wangcong@...il.com> wrote:
>> Cc'ing netdev
>>
>> On Fri, Aug 30, 2013 at 4:20 PM, Baoquan He <baoquan.he@...il.com> wrote:
>>> Hi,
>>>
>>> I tried the 3.11.0-rc7+ on x86_64, and after bootup, the soft lockup bug
>>> happened.
>>>
>>> [ 48.895000] BUG: soft lockup - CPU#1 stuck for 22s! [ebtables:444]
>>> [ 48.901191] Modules linked in: bnep(F) bluetooth(F) ebtables(F)
>>> ip6table_filter(F) ip6_tables(F) rfkill(F) snd_hda_intel(F+)
>>> snd_hda_codec(F) snd_hwdep(F) snd_seq(F) sn)
>>> [ 48.950034] CPU: 1 PID: 444 Comm: ebtables Tainted: GF D
>>> 3.11.0-rc7+ #1
>>> [ 48.957433] Hardware name: Hewlett-Packard HP Z420 Workstation/1589,
>>> BIOS J61 v01.02 03/09/2012
>>> [ 48.966131] task: ffff88040c2dc650 ti: ffff8804187d2000 task.ti:
>>> ffff8804187d2000
>>> [ 48.973610] RIP: 0010:[<ffffffff812e57a7>] [<ffffffff812e57a7>]
>>> strcmp+0x27/0x40
>>> [ 48.981119] RSP: 0018:ffff8804187d3db8 EFLAGS: 00000246
>>> [ 48.986430] RAX: 0000000000000000 RBX: 00007fffda942730 RCX:
>>> ffff8804187d3fd8
>>> [ 48.993566] RDX: 0000000000000000 RSI: ffff8804187d3e01 RDI:
>>> ffffffff81cb8a39
>>> [ 49.000707] RBP: ffff8804187d3db8 R08: 00000000fffffff2 R09:
>>> 0000000000000000
>>> [ 49.007841] R10: 0000000000000163 R11: 0000000000000000 R12:
>>> ffffffff8128300c
>>> [ 49.014972] R13: ffff8804187d3d98 R14: ffff8804187d3ef4 R15:
>>> 0000000000000004
>>> [ 49.022112] FS: 00007faab6589740(0000) GS:ffff88042fc80000(0000)
>>> knlGS:0000000000000000
>>> [ 49.030194] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>>> [ 49.035942] CR2: 0000003f0d810414 CR3: 000000040d2cc000 CR4:
>>> 00000000000407e0
>>> [ 49.043077] Stack:
>>> [ 49.045096] ffff8804187d3de8 ffffffffa0249674 0000000000000080
>>> ffffffff81cb8180
>>> [ 49.052559] 00007fffda942730 ffff8804187d3ef4 ffff8804187d3ea0
>>> ffffffffa02497a9
>>> [ 49.060020] 0000000000000000 00007265746c6966 0000003f0d7b92c0
>>> 00007fffda942850
>>> [ 49.067487] Call Trace:
>>> [ 49.069949] [<ffffffffa0249674>]
>>> find_inlist_lock.constprop.16+0x54/0x100 [ebtables]
>>> [ 49.077779] [<ffffffffa02497a9>] do_ebt_get_ctl+0x89/0x1d0 [ebtables]
>>> [ 49.084306] [<ffffffff81551ca8>] nf_getsockopt+0x68/0x90
>>> [ 49.089717] [<ffffffff81560d40>] ip_getsockopt+0x80/0xa0
>>> [ 49.095113] [<ffffffff815835c5>] raw_getsockopt+0x25/0x50
>>> [ 49.100588] [<ffffffff8150ddd4>] sock_common_getsockopt+0x14/0x20
>>> [ 49.106766] [<ffffffff8150d208>] SyS_getsockopt+0x68/0xd0
>>> [ 49.112257] [<ffffffff8162c682>] system_call_fastpath+0x16/0x1b
>>> [ 49.118260] Code: 00 00 00 00 55 48 89 e5 eb 0e 66 2e 0f 1f 84 00 00
>>> 00 00 00 84 c0 74 1c 48 83 c7 01 0f b6 47 ff 48 83 c6 01 3a 46 ff 74 eb
>>> 19 c0 <83> c8 01 5d c3 0f 1
>>> [ 76.925880] BUG: soft lockup - CPU#1 stuck for 22s! [ebtables:444]
>>> [ 76.932069] Modules linked in: bnep(F) bluetooth(F) ebtables(F)
>>> ip6table_filter(F) ip6_tables(F) rfkill(F) snd_hda_intel(F+)
>>> snd_hda_codec(F) snd_hwdep(F) snd_seq(F) sn)
>>> [ 76.980847] CPU: 1 PID: 444 Comm: ebtables Tainted: GF D
>>> 3.11.0-rc7+ #1
>>> [ 76.988245] Hardware name: Hewlett-Packard HP Z420 Workstation/1589,
>>> BIOS J61 v01.02 03/09/2012
>>> [ 76.996940] task: ffff88040c2dc650 ti: ffff8804187d2000 task.ti:
>>> ffff8804187d2000
>>> [ 77.004426] RIP: 0010:[<ffffffff812e5784>] [<ffffffff812e5784>]
>>> strcmp+0x4/0x40
>>> [ 77.011849] RSP: 0018:ffff8804187d3db8 EFLAGS: 00000212
>>> [ 77.017163] RAX: 0000000000000001 RBX: 00007fffda942730 RCX:
>>> ffff8804187d3fd8
>>> [ 77.024304] RDX: 0000000000000000 RSI: ffff8804187d3e00 RDI:
>>> ffffffff81cb8a38
>>> [ 77.031434] RBP: ffff8804187d3db8 R08: 00000000fffffff2 R09:
>>> 0000000000000000
>>> [ 77.038566] R10: 0000000000000163 R11: 0000000000000000 R12:
>>> ffffffff8128300c
>>> [ 77.045699] R13: ffff8804187d3d98 R14: ffff8804187d3ef4 R15:
>>> 0000000000000004
>>> [ 77.052842] FS: 00007faab6589740(0000) GS:ffff88042fc80000(0000)
>>> knlGS:0000000000000000
>>> [ 77.060934] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>>> [ 77.066668] CR2: 0000003f0d810414 CR3: 000000040d2cc000 CR4:
>>> 00000000000407e0
>>> [ 77.073799] Stack:
>>> [ 77.075818] ffff8804187d3de8 ffffffffa0249674 0000000000000080
>>> ffffffff81cb8180
>>> [ 77.083287] 00007fffda942730 ffff8804187d3ef4 ffff8804187d3ea0
>>> ffffffffa02497a9
>>> [ 77.090749] 0000000000000000 00007265746c6966 0000003f0d7b92c0
>>> 00007fffda942850
>>> [ 77.098215] Call Trace:
>>> [ 77.100668] [<ffffffffa0249674>]
>>> find_inlist_lock.constprop.16+0x54/0x100 [ebtables]
>>> [ 77.108500] [<ffffffffa02497a9>] do_ebt_get_ctl+0x89/0x1d0 [ebtables]
>>> [ 77.115035] [<ffffffff81551ca8>] nf_getsockopt+0x68/0x90
>>> [ 77.120438] [<ffffffff81560d40>] ip_getsockopt+0x80/0xa0
>>> [ 77.125845] [<ffffffff815835c5>] raw_getsockopt+0x25/0x50
>>> [ 77.131328] [<ffffffff8150ddd4>] sock_common_getsockopt+0x14/0x20
>>> [ 77.137515] [<ffffffff8150d208>] SyS_getsockopt+0x68/0xd0
>>> [ 77.143011] [<ffffffff8162c682>] system_call_fastpath+0x16/0x1b
>>> [ 77.149019] Code: 0f 1f 80 00 00 00 00 48 83 c6 01 0f b6 4e ff 48 83
>>> c2 01 84 c9 88 4a ff 75 ed 5d c3 66 66 2e 0f 1f 84 00 00 00 00 00 55 48
>>> 89 e5 <eb> 0e 66 2e 0f 1f 8
>>
>> Does the following patch help?
>>
>>
>> diff --git a/net/bridge/netfilter/ebtables.c b/net/bridge/netfilter/ebtables.c
>> index ac78024..4a0ec8f 100644
>> --- a/net/bridge/netfilter/ebtables.c
>> +++ b/net/bridge/netfilter/ebtables.c
>> @@ -1503,6 +1503,10 @@ static int do_ebt_get_ctl(struct sock *sk, int
>> cmd, void __user *user, int *len)
>> if (copy_from_user(&tmp, user, sizeof(tmp)))
>> return -EFAULT;
>>
>> + if (memscan(tmp.name, '\0', EBT_TABLE_MAXNAMELEN) ==
>> + (tmp.name + EBT_TABLE_MAXNAMELEN))
>> + return -EINVAL;
>> +
>> t = find_table_lock(net, tmp.name, &ret, &ebt_mutex);
>> if (!t)
>> return ret;
>> --
>>
> release lock!!
>
> --- a/net/bridge/netfilter/ebtables.c Sat Aug 31 11:12:54 2013
> +++ b/net/bridge/netfilter/ebtables.c Sat Aug 31 11:15:24 2013
> @@ -332,8 +332,10 @@ find_inlist_lock_noload(struct list_head
> return NULL;
>
> list_for_each_entry(e, head, list) {
> - if (strcmp(e->name, name) == 0)
> + if (strcmp(e->name, name) == 0) {
> + mutex_unlock(mutex);
> return e;
> + }
> }
> *error = -ENOENT;
> mutex_unlock(mutex);
> --
--
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