linux-kernel - Re: Boot problems on Malta with EVA (bisected to 12220dea07f1 "mm/slab: support slab merge")

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Date:	Tue, 28 Oct 2014 22:48:55 +0900
From:	Joonsoo Kim <js1304@...il.com>
To:	Markos Chandras <Markos.Chandras@...tec.com>
Cc:	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Christoph Lameter <cl@...ux.com>,
	Pekka Enberg <penberg@...nel.org>,
	David Rientjes <rientjes@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>, linux-mips@...ux-mips.org
Subject: Re: Boot problems on Malta with EVA (bisected to 12220dea07f1
 "mm/slab: support slab merge")

2014-10-28 22:24 GMT+09:00 Markos Chandras <Markos.Chandras@...tec.com>:
> On 10/28/2014 01:19 PM, Markos Chandras wrote:
>> On 10/28/2014 01:01 PM, Joonsoo Kim wrote:
>>> 2014-10-28 19:45 GMT+09:00 Markos Chandras <Markos.Chandras@...tec.com>:
>>>> Hi,
>>>>
>>>> It seems I am unable to boot my Malta with EVA. The problem appeared in
>>>> the 3.18 merge window. I bisected the problem (between v3.17 and
>>>> v3.18-rc1) and I found the following commit responsible for the broken boot.
>>>
>>> Hello,
>>>
>>> Did you start to bisect from v3.18-rc1?
>>> I'd like to be sure that this is another bug which is fixed by following commit.
>>>
>>> commit 85c9f4b04a08f6bc770b77530c22d04103468b8f
>>> Author: Joonsoo Kim <iamjoonsoo.kim@....com>
>>> Date:   Mon Oct 13 15:51:01 2014 -0700
>>>
>>>     mm/slab: fix unaligned access on sparc64
>>>
>>> This fix is merged into v3.18-rc1 sometime later that
>>> 'support slab merge' is merged.
>>>
>>> Thanks.
>>>
>> Hi,
>>
>> I bisected from v3.17 until 3.18-rc1. But 3.18-rc2 and the latest
>> mainline (f7e87a44ef60ad379e39b45437604141453bf0ec) still have the same
>> problem
>>
>> btw i did more tests and this is not EVA specific. A maltaup_defconfig
>> fails in the same way. I suspect all malta*_defconfigs will fail in a
>> similar way which makes it probably easier for you to reproduce it on a
>> QEMU.
>>
>
> sorry maltaup_defconfig does not fail. maltasmvp_defconfig does. So it
> might be a similar problem like the one fixed in
> 85c9f4b04a08f6bc770b77530c22d04103468b8f

Oops. Sorry. Above commit ('mm/slab: fix unaligned access on sparc64')
is irrelevant to this problem.

Anyway, your problem would be related to merging with incompatible slab cache.
Best way to debug is printing source/target slab cache's object size and
alignment and find the problem. I will try to reproduce it using QEMU.

Thanks.
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