From: Yongqiang Yang <xiaoqiangnk@gmail.com>
To: Wu Fengguang <fengguang.wu@intel.com>
Cc: "linux-ext4@vger.kernel.org" <linux-ext4@vger.kernel.org>,
"linux-fsdevel@vger.kernel.org" <linux-fsdevel@vger.kernel.org>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: 3.2.0-rc5 NULL dereference BUG
Date: Thu, 5 Jan 2012 10:23:13 +0800 [thread overview]
Message-ID: <CAGBYx2ZyiKrbsQmiC3YxB7sKjhEQVeznUM2cGrXMyQuXPZ5o1Q@mail.gmail.com> (raw)
In-Reply-To: <20120105015609.GA7913@localhost>
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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next prev parent reply other threads:[~2012-01-05 2:23 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-12-18 5:54 3.2.0-rc5 NULL dereference BUG Wu Fengguang
2011-12-18 6:30 ` Wu Fengguang
2011-12-18 7:17 ` Yongqiang Yang
2011-12-18 11:32 ` Wu Fengguang
2012-01-05 1:56 ` Wu Fengguang
2012-01-05 2:23 ` Yongqiang Yang [this message]
2012-01-05 2:25 ` Wu Fengguang
[not found] ` <20120105023424.GA12242@localhost>
[not found] ` <CAGBYx2ZuL3j-T5nPermw3GZz4AWf-FsWcdj1+CT10TLAZBdUqw@mail.gmail.com>
[not found] ` <20120105024312.GA13069@localhost>
[not found] ` <CAGBYx2bP-ES0eg6KdfJFAfd4cNw61RDhWz=vHE-mTKFCVWwMHQ@mail.gmail.com>
2012-01-08 14:06 ` Wu Fengguang
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