From: Yinghai Lu <yinghai@kernel.org>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Ingo Molnar <mingo@kernel.org>, "H. Peter Anvin" <hpa@zytor.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
srikar@linux.vnet.ibm.com, Thomas Gleixner <tglx@linutronix.de>,
"linux-tip-commits@vger.kernel.org"
<linux-tip-commits@vger.kernel.org>
Subject: Re: [tip:sched/urgent] sched: Check sched_domain before computing group power
Date: Thu, 21 Nov 2013 14:03:13 -0800 [thread overview]
Message-ID: <CAE9FiQUCPvzeiCSan34aV6hfrDHdV=sfHug0tMaAgpOMbum7jw@mail.gmail.com> (raw)
In-Reply-To: <CAE9FiQUHQ7jQfpxi+s7yeef17-+ApGjU2X1iRnm=azJ0+BFWZw@mail.gmail.com>
On Thu, Nov 21, 2013 at 9:22 AM, Yinghai Lu <yinghai@kernel.org> wrote:
> On Thu, Nov 21, 2013 at 7:03 AM, Peter Zijlstra <peterz@infradead.org> wrote:
>>>
>>> This one seems fix NULL reference in compute_group_power.
>>>
>>> but get following on current Linus tree plus tip/sched/urgent.
>>>
>>> divide error: 0000 [#1] SMP
>>> [ 28.190477] Modules linked in:
>>> [ 28.192012] CPU: 11 PID: 484 Comm: kworker/u324:0 Not tainted
>>> 3.12.0-yh-10487-g4b94e59-dirty #2044
>>> [ 28.210488] Hardware name: Oracle Corporation Sun Fire
>>> [ 28.229877] task: ffff88ff25205140 ti: ffff88ff2520a000 task.ti:
>>> ffff88ff2520a000
>>> [ 28.236139] RIP: 0010:[<ffffffff810d9ff4>] [<ffffffff810d9ff4>]
>>> find_busiest_group+0x2b4/0x8a0
>>
>> Hurmph.. what kind of hardware is that? and is there anything funny you
>> do to make it do this?
>
> intel nehanem-ex or westmere-ex 8 sockets system.
>
> I tried without my local patches, the problem is still there.
original one in linus's tree:
[ 8.952728] NMI watchdog: enabled on all CPUs, permanently consumes
one hw-PMU counter.
[ 8.965697] BUG: unable to handle kernel NULL pointer dereference
at 0000000000000010
[ 8.969495] IP: [<ffffffff810d7b53>] update_group_power+0x1d3/0x250
[ 8.987159] PGD 0
[ 8.989280] Oops: 0000 [#1] SMP
[ 8.991686] Modules linked in:
[ 8.993803] CPU: 0 PID: 1 Comm: swapper/0 Not tainted
3.12.0-yh-02845-g527d151 #2048
[ 9.009175] Hardware name: Oracle Corporation Sun Fire X4800 M2 /
, BIOS 15013200 04/19/2012
[ 9.028433] task: ffff883f24e28000 ti: ffff883f24e24000 task.ti:
ffff883f24e24000
[ 9.033249] RIP: 0010:[<ffffffff810d7b53>] [<ffffffff810d7b53>]
update_group_power+0x1d3/0x250
[ 9.051193] RSP: 0000:ffff883f24e25d68 EFLAGS: 00010283
[ 9.068162] RAX: 0000000000000001 RBX: 0000000000000000 RCX: 0000000000000000
[ 9.071838] RDX: 0000000000000000 RSI: 00000000000000a0 RDI: 00000000000000a0
[ 9.090260] RBP: ffff883f24e25d98 R08: ffff88ffc4891020 R09: 0000000000000000
[ 9.107870] R10: ffff88ffc4890818 R11: 0000000000000001 R12: 00000000001d40c0
[ 9.111527] R13: ffff88ffc4891018 R14: ffff88ffc4891000 R15: 0000000000000000
[ 9.131279] FS: 0000000000000000(0000) GS:ffff883f7d600000(0000)
knlGS:0000000000000000
[ 9.148870] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[ 9.151914] CR2: 0000000000000010 CR3: 0000000002c14000 CR4: 00000000000007f0
[ 9.168645] Stack:
[ 9.169871] ffff883f24e25d88 ffff88ffc4891000 ffff88ffc4870000
0000000000000001
[ 9.188660] 0000000000000001 ffff883f23b0d400 ffff883f24e25e58
ffffffff810ce094
[ 9.193232] ffff883f24e25dd8 0000000000000246 0000000000000003
ffffffff000000a0
[ 9.210992] Call Trace:
[ 9.212524] [<ffffffff810ce094>] build_sched_domains+0x6f4/0x980
[ 9.229900] [<ffffffff83042a2b>] sched_init_smp+0x95/0x146
[ 9.233236] [<ffffffff83023023>] kernel_init_freeable+0x148/0x259
[ 9.250019] [<ffffffff82121bce>] ? kernel_init+0xe/0x130
[ 9.253356] [<ffffffff82121bc0>] ? rest_init+0xd0/0xd0
[ 9.268882] [<ffffffff82121bce>] kernel_init+0xe/0x130
[ 9.271661] [<ffffffff8215176c>] ret_from_fork+0x7c/0xb0
[ 9.288882] [<ffffffff82121bc0>] ? rest_init+0xd0/0xd0
[ 9.292476] Code: ff 31 db b8 ff ff ff ff 4d 8d 6e 18 eb 31 66 2e
0f 1f 84 00 00 00 00 00 48 63 d0 48 8b 14 d5 40 c4 e2 82 49 8b 94 14
08 09 00 00 <48> 8b 52 10 48 8b 52 10 8b 4a 08 8b 52 04 49 01 cf 48 01
d3 83
[ 9.335669] RIP [<ffffffff810d7b53>] update_group_power+0x1d3/0x250
[ 9.348090] RSP <ffff883f24e25d68>
[ 9.350240] CR2: 0000000000000010
[ 9.351803] ---[ end trace a21cca9ad6b48d40 ]---
[ 9.367839] Kernel panic - not syncing: Attempted to kill init!
exitcode=0x00000009
[ 9.367839]
next prev parent reply other threads:[~2013-11-21 22:03 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-09-12 18:05 [tip:sched/core] sched/fair: Fix group power_orig computation tip-bot for Peter Zijlstra
2013-09-12 23:21 ` Michael Neuling
2013-11-12 10:55 ` Srikar Dronamraju
2013-11-12 11:57 ` Peter Zijlstra
2013-11-12 16:41 ` [PATCH v2] sched: Check sched_domain before computing group power Srikar Dronamraju
2013-11-12 17:03 ` Peter Zijlstra
2013-11-12 17:15 ` Srikar Dronamraju
2013-11-12 17:55 ` Peter Zijlstra
2013-11-13 5:55 ` Srikar Dronamraju
[not found] ` <CAM4v1pNMn=5oZDiX3fUp9uPkZTPJgk=vEKEjevzvpwn=PjTzXg@mail.gmail.com>
2013-11-13 11:23 ` Srikar Dronamraju
2013-11-14 6:06 ` Preeti U Murthy
2013-11-14 8:30 ` Peter Zijlstra
2013-11-14 9:12 ` Preeti U Murthy
2013-11-13 15:17 ` Peter Zijlstra
2013-11-14 10:50 ` Srikar Dronamraju
2013-11-14 11:15 ` Peter Zijlstra
2013-11-19 19:15 ` [tip:sched/urgent] " tip-bot for Srikar Dronamraju
2013-11-19 23:36 ` Yinghai Lu
2013-11-21 15:03 ` Peter Zijlstra
2013-11-21 17:22 ` Yinghai Lu
2013-11-21 22:03 ` Yinghai Lu [this message]
2013-11-28 3:02 ` David Rientjes
2013-11-28 7:07 ` Yinghai Lu
2013-11-28 9:38 ` Peter Zijlstra
2013-11-28 20:23 ` Yinghai Lu
2013-12-06 6:24 ` Yinghai Lu
2013-12-10 10:58 ` Peter Zijlstra
2013-12-10 21:26 ` Yinghai Lu
2013-11-22 12:07 ` Peter Zijlstra
2013-11-23 5:00 ` Yinghai Lu
2013-11-23 18:53 ` Peter Zijlstra
2013-11-28 2:57 ` David Rientjes
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