Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932096Ab3IBG5Y (ORCPT ); Mon, 2 Sep 2013 02:57:24 -0400 Received: from szxga01-in.huawei.com ([119.145.14.64]:13051 "EHLO szxga01-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754914Ab3IBG5X (ORCPT ); Mon, 2 Sep 2013 02:57:23 -0400 Message-ID: <522436CC.3080108@huawei.com> Date: Mon, 2 Sep 2013 14:57:16 +0800 From: Ding Tianhong User-Agent: Mozilla/5.0 (Windows NT 6.1; rv:17.0) Gecko/20130801 Thunderbird/17.0.8 MIME-Version: 1.0 To: Baoquan He CC: Hillf Danton , Cong Wang , LKML , Linux Kernel Network Developers Subject: Re: 3.11-rc7:BUG: soft lockup References: <522055D7.70002@gmail.com>

<52242AEA.9020502@gmail.com> In-Reply-To: <52242AEA.9020502@gmail.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-Originating-IP: [10.135.72.199] X-CFilter-Loop: Reflected Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 7736 Lines: 179 On 2013/9/2 14:06, Baoquan He wrote: > 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 wrote: >>> Cc'ing netdev >>> >>> On Fri, Aug 30, 2013 at 4:20 PM, Baoquan He 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:[] [] >>>> 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] [] >>>> find_inlist_lock.constprop.16+0x54/0x100 [ebtables] >>>> [ 49.077779] [] do_ebt_get_ctl+0x89/0x1d0 [ebtables] >>>> [ 49.084306] [] nf_getsockopt+0x68/0x90 >>>> [ 49.089717] [] ip_getsockopt+0x80/0xa0 >>>> [ 49.095113] [] raw_getsockopt+0x25/0x50 >>>> [ 49.100588] [] sock_common_getsockopt+0x14/0x20 >>>> [ 49.106766] [] SyS_getsockopt+0x68/0xd0 >>>> [ 49.112257] [] 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:[] [] >>>> 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] [] >>>> find_inlist_lock.constprop.16+0x54/0x100 [ebtables] >>>> [ 77.108500] [] do_ebt_get_ctl+0x89/0x1d0 [ebtables] >>>> [ 77.115035] [] nf_getsockopt+0x68/0x90 >>>> [ 77.120438] [] ip_getsockopt+0x80/0xa0 >>>> [ 77.125845] [] raw_getsockopt+0x25/0x50 >>>> [ 77.131328] [] sock_common_getsockopt+0x14/0x20 >>>> [ 77.137515] [] SyS_getsockopt+0x68/0xd0 >>>> [ 77.143011] [] 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 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); >> -- could not release lock here, otherwise there will unlock twice. I did not meet any problem about the drivers, maybe it is hard to occur. > > -- > To unsubscribe from this list: send the line "unsubscribe netdev" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > > . > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/