On Tue, Jan 17, 2012 at 5:52 PM, Srivatsa S. Bhat
<srivatsa.bhat@linux.vnet.ibm.com> wrote:
> On 01/17/2012 07:51 AM, Suresh Siddha wrote:
>
>> On Sat, 2012-01-14 at 08:11 +0530, Srivatsa S. Bhat wrote:
>>> Of course, the warnings at drivers/base/core.c: device_release()
>>> as well as the IPI to offline cpu warnings still appear but are rather
>>> unrelated and harmless to the issue being discussed.
>>
>> As far the IPI offline cpu warnings are concerned, appended patch should
>> fix it. Can you please give it a try? Peterz, can you please review and
>> queue it after Srivatsa confirms that it works? Thanks.
>
>
> Hi Suresh,
>
> Thanks for the patch, but unfortunately it doesn't fix the problem!
> Exactly the same stack traces are seen during a CPU Hotplug stress test.
> (I didn't even have to stress it - it is so fragile that just a script
> to offline all cpus except the boot cpu was good enough to reproduce the
> problem easily.)

Works for me. But I'm still seeing this only during boot. Related?
Shall I bisect?


Freeing unused kernel memory: 520k freed
Write protecting the kernel read-only data: 8192k
Freeing unused kernel memory: 1140k freed
Freeing unused kernel memory: 464k freed
Adding 8290300k swap on /dev/sda3.  Priority:-1 extents:1 across:8290300k SS
vmalloc: allocation failure: 0 bytes
modprobe: page allocation failure: order:0, mode:0xd2
Pid: 1914, comm: modprobe Not tainted 3.2.0 #6
Call Trace:
[<ffffffff8107c1ff>] ? 0xffffffff8107c1ff
[<ffffffff81061fec>] ? 0xffffffff81061fec
[<ffffffff8109ab6c>] ? 0xffffffff8109ab6c
[<ffffffff81061fec>] ? 0xffffffff81061fec
[<ffffffff8101bacc>] ? 0xffffffff8101bacc
[<ffffffff81061fec>] ? 0xffffffff81061fec
[<ffffffff81061fec>] ? 0xffffffff81061fec
[<ffffffff81062ec8>] ? 0xffffffff81062ec8
[<ffffffff810637c1>] ? 0xffffffff810637c1
[<ffffffff814d9cb9>] ? 0xffffffff814d9cb9
Mem-Info:
Node 0 DMA per-cpu:
CPU    0: hi:    0, btch:   1 usd:   0
CPU    1: hi:    0, btch:   1 usd:   0
CPU    2: hi:    0, btch:   1 usd:   0
CPU    3: hi:    0, btch:   1 usd:   0
Node 0 DMA32 per-cpu:
CPU    0: hi:  186, btch:  31 usd: 158
CPU    1: hi:  186, btch:  31 usd:  25
CPU    2: hi:  186, btch:  31 usd:   0
CPU    3: hi:  186, btch:  31 usd:   0
Node 0 Normal per-cpu:
CPU    0: hi:  186, btch:  31 usd:  93
CPU    1: hi:  186, btch:  31 usd:  74
CPU    2: hi:  186, btch:  31 usd: 170
CPU    3: hi:  186, btch:  31 usd:  60
active_anon:6162 inactive_anon:1 isolated_anon:0
active_file:1782 inactive_file:5164 isolated_file:0
unevictable:0 dirty:0 writeback:0 unstable:0
free:1963131 slab_reclaimable:818 slab_unreclaimable:2728
mapped:1639 shmem:3 pagetables:292 bounce:0


Thanks,
Jeff