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Message-ID: <CAGBYx2ZyiKrbsQmiC3YxB7sKjhEQVeznUM2cGrXMyQuXPZ5o1Q@mail.gmail.com>
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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