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Date:	Thu, 5 Jan 2012 10:23:13 +0800
From:	Yongqiang Yang <xiaoqiangnk@...il.com>
To:	Wu Fengguang <fengguang.wu@...el.com>
Cc:	"linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>,
	"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: 3.2.0-rc5 NULL dereference BUG

Hi Fengguang,

> [  646.051405]  ffff880004ee1978 0000000000000000 0000000000000170 0000000000000000
> [  646.051405] Call Trace:
> [  646.051405]  [<ffffffff81099aa3>] ? sched_clock_local+0x12/0x75
> [  646.051405]  [<ffffffff810a5a16>] lock_acquire+0xdd/0x10a
> [  646.051405]  [<ffffffff81175de4>] ? create_empty_buffers+0x4a/0xc1
> [  646.051405]  [<ffffffff8199f623>] _raw_spin_lock+0x36/0x69
> [  646.051405]  [<ffffffff81175de4>] ? create_empty_buffers+0x4a/0xc1
> [  646.051405]  [<ffffffff81175de4>] create_empty_buffers+0x4a/0xc1
> [  646.051405]  [<ffffffff811efd2f>] ext4_discard_partial_page_buffers_no_lock+0x9f/0x406
> [  646.051405]  [<ffffffff8199ffeb>] ? _raw_spin_unlock+0x2b/0x2f
> [  646.051405]  [<ffffffff81170c26>] ? __mark_inode_dirty+0x1ac/0x1cc
> [  646.051405]  [<ffffffff811767f3>] ? generic_write_end+0x6d/0x7f
> [  646.051405]  [<ffffffff811f15e5>] ext4_da_write_end+0x244/0x2ed
> [  646.051405]  [<ffffffff810ffeec>] generic_file_buffered_write+0x183/0x22d
It seems that you are running in to several problems related to
discard_page_buffers_no_lock in write_end.  The problems had been
fixed by following patches [ext4: avoid potential hang in
mpage_submit_io() when blocksize < pagesize], [ext4: correctly handle
pages w/o buffers in ext4_discard_partial_buffers()] and [ext4: handle
EOF correctly in ext4_bio_write_page()].   The patches had been merged
to rc6.


Yongqiang.
>
> The test case is about running 100 dd tasks on each of the 10 JBOD disks:

>
>        lkp-st02-x8664/JBOD-10HDD-thresh=100M/ext4-100dd-1-3.2.0-rc5-ioless-full+
>
> Thanks,
> Fengguang



-- 
Best Wishes
Yongqiang Yang
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