linux-kernel - Re: [PATCH] mm: fix BUG on madvise early failure

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Date:	Tue, 15 Jan 2013 09:55:50 +0100
From:	Sedat Dilek <sedat.dilek@...il.com>
To:	Sasha Levin <sasha.levin@...cle.com>,
	Shaohua Li <shli@...ionio.com>
Cc:	linux-mm <linux-mm@...ck.org>, LKML <linux-kernel@...r.kernel.org>,
	linux-next <linux-next@...r.kernel.org>
Subject: Re: [PATCH] mm: fix BUG on madvise early failure

On Tue, Jan 15, 2013 at 1:18 AM, Sedat Dilek <sedat.dilek@...il.com> wrote:
> On Tue, Jan 15, 2013 at 12:44 AM, Sedat Dilek <sedat.dilek@...il.com> wrote:
>> On Mon, Jan 14, 2013 at 10:29 PM, Sedat Dilek <sedat.dilek@...il.com> wrote:
>>> Hi,
>>>
>>> this patch is for Linux-Next - more exactly next-20130114.
>>> Can you please enhance the subject-line of your patch next time.
>>>
>>> Your patch fixes the issue I have reported a few hours ago in [1].
>>>
>>> [ TESTCASE ]
>>>
>>> "madvise02" from Linux Test Project (LTP) see [2]
>>>
>>> $ cd /opt/ltp/testcases/bin/
>>>
>>> $ sudo ./madvise02
>>> [ OUTPUT ]
>>> madvise02    1  TPASS  :  failed as expected: TEST_ERRNO=EINVAL(22):
>>> Invalid argument
>>> madvise02    2  TPASS  :  failed as expected: TEST_ERRNO=EINVAL(22):
>>> Invalid argument
>>> madvise02    3  TPASS  :  failed as expected: TEST_ERRNO=EINVAL(22):
>>> Invalid argument
>>> madvise02    4  TPASS  :  failed as expected: TEST_ERRNO=ENOMEM(12):
>>> Cannot allocate memory
>>> madvise02    5  TFAIL  :  madvise succeeded unexpectedly
>>>
>>> [ /TESTCASE ]
>>>
>>> Please feel free and add a...
>>>
>>>      Tested-by: Sedat Dilek <sedat.dilek@...il.com>
>>>
>>> Thanks!
>>>
>>> Regards,
>>> - Sedat -
>>>
>>> [1] http://marc.info/?l=linux-mm&m=135818843710244&w=2
>>> [2] http://sourceforge.net/projects/ltp/
>>
>> You happen to know how I get more verbose-debug outputs?
>>
>> You have...
>>
>> [   57.320031] kernel BUG at block/blk-core.c:2981!
>> [   57.320031] invalid opcode: 0000 [#3] PREEMPT SMP DEBUG_PAGEALLOC
>>
>> Me has...
>>
>> [ 1263.965989] Kernel BUG at ffffffff81328b2b [verbose debug info unavailable]
>> [ 1263.966022] invalid opcode: 0000 [#1] SMP
>>
>> CONFIG_DEBUG_PAGEALLOC=y ?
>>
>> Block-specific debug settings?
>>
>> $ egrep -i 'block|blk' .config | egrep -i 'debug|dbg'
>> # CONFIG_DEBUG_BLK_CGROUP is not set
>> # CONFIG_DEBUG_BLOCK_EXT_DEVT is not set
>>
>
> Hmm, DEBUG_PAGEALLOC=y did not help.
>
> Maybe this one...
>
> $ grep DEBUG_BUGVERBOSE .config
> # CONFIG_DEBUG_BUGVERBOSE is not set
>

CONFIG_DEBUG_BUGVERBOSE=y is what I was searching for!
( Sorry for fludding the MLs. )

- Sedat -

> - Sedat -
>
>> - Sedat -

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