linux-kernel - Re: [PATCH 00/31] numa/core patches

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Date:	Wed, 31 Oct 2012 21:15:36 +0800
From:	Zhouping Liu <zliu@...hat.com>
To:	Hugh Dickins <hughd@...gle.com>
CC:	Johannes Weiner <hannes@...xchg.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Rik van Riel <riel@...hat.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Mel Gorman <mgorman@...e.de>,
	Thomas Gleixner <tglx@...utronix.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Ingo Molnar <mingo@...nel.org>, CAI Qian <caiqian@...hat.com>
Subject: Re: [PATCH 00/31] numa/core patches

On 10/31/2012 03:26 PM, Hugh Dickins wrote:
> On Tue, 30 Oct 2012, Johannes Weiner wrote:
>
> [88099.923724] ------------[ cut here ]------------
> [88099.924036] kernel BUG at mm/memcontrol.c:1134!
> [88099.924036] invalid opcode: 0000 [#1] SMP
> [88099.924036] Modules linked in: lockd sunrpc kvm_amd kvm
> amd64_edac_mod edac_core ses enclosure serio_raw bnx2 pcspkr shpchp
> joydev i2c_piix4 edac_mce_amd k8temp dcdbas ata_generic pata_acpi
> megaraid_sas pata_serverworks usb_storage radeon i2c_algo_bit
> drm_kms_helper ttm drm i2c_core
> [88099.924036] CPU 7
> [88099.924036] Pid: 3441, comm: stress Not tainted 3.7.0-rc2Jons+ #3
> Dell Inc. PowerEdge 6950/0WN213
> [88099.924036] RIP: 0010:[<ffffffff81188e97>] [<ffffffff81188e97>]
> mem_cgroup_update_lru_size+0x27/0x30
>> Thanks a lot for your testing efforts, I really appreciate it.
>>
>> I'm looking into it, but I don't expect power to get back for several
>> days where I live, so it's hard to reproduce it locally.
>>
>> But that looks like an LRU accounting imbalance that I wasn't able to
>> tie to this patch yet.  Do you see weird numbers for the lru counters
>> in /proc/vmstat even without this memory cgroup patch?  Ccing Hugh as
>> well.
> Sorry, I didn't get very far with it tonight.
>
> Almost certain to be a page which was added to lru while it looked like
> a 4k page, but taken off lru as a 2M page: we are taking a 2M page off
> lru here, it's likely to be the page in question, but not necessarily.
>
> There's quite a few put_page()s in do_huge_pmd_numa_page(), and it
> would help if we could focus on the one which is giving the trouble,
> but I don't know which that is.  Zhouping, if you can, please would
> you do an "objdump -ld vmlinux >bigfile" of your kernel, then extract
> from bigfile just the lines from "<do_huge_pmd_numa_page>:" to whatever
> is the next function, and post or mail privately just that disassembly.
> That should be good to identify which of the put_page()s is involved.

Hugh, I didn't find the next function, as I can't find any words that 
matched "do_huge_pmd_numa_page".
is there any other methods? also I tried to use kdump to dump vmcore 
file, but unluckily kdump didn't
work well, if you think it useful to dump vmcore file, I can try it 
again and provide more info.

Thanks,
Zhouping
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