From: Wu Fengguang <fengguang.wu@intel.com>
To: Yongqiang Yang <xiaoqiangnk@gmail.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 09:56:09 +0800 [thread overview]
Message-ID: <20120105015609.GA7913@localhost> (raw)
In-Reply-To: <20111218113237.GA1359@localhost>
On Sun, Dec 18, 2011 at 07:32:37PM +0800, Wu Fengguang wrote:
> Yongqiang,
>
> Thanks for the quick fix!
>
> On Sun, Dec 18, 2011 at 03:17:18PM +0800, Yongqiang Yang wrote:
> > Hi Fengguang,
> >
> > Could you try the patch [ext4: do not reference pa_inode from group_pa]?
>
> It works! You can add my tested-by and CC stable.
The patch seems to only fix part of the problem. Today I get this slightly
different dmesg (the kernel has been patched with [ext4: do not reference
pa_inode from group_pa]):
[ 646.026574] BUG: unable to handle kernel NULL pointer dereference at 0000000000000178
[ 646.027004] IP: [<ffffffff810a5092>] __lock_acquire+0x8b/0x932
[ 646.027004] PGD 4f85067 PUD 99cb4067 PMD 0
[ 646.027004] Oops: 0000 [#1] SMP DEBUG_PAGEALLOC
[ 646.027004] CPU 6
[ 646.051405] Modules linked in:
[ 646.051405]
[ 646.051405] Pid: 6149, comm: dd Not tainted 3.2.0-rc5-ioless-full+ #1009 Supermicro X7DW3/X7DWN
[ 646.051405] RIP: 0010:[<ffffffff810a5092>] [<ffffffff810a5092>] __lock_acquire+0x8b/0x932
[ 646.051405] RSP: 0018:ffff880004ee18d8 EFLAGS: 00010097
[ 646.051405] RAX: 0000000000000000 RBX: 0000000000000170 RCX: 0000000000000000
[ 646.051405] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000170
[ 646.051405] RBP: ffff880004ee1948 R08: 0000000000000000 R09: 0000000000000000
[ 646.051405] R10: 0000000000000170 R11: ffffffff81175de4 R12: 0000000000000000
[ 646.051405] R13: 0000000000000000 R14: ffff880004fc4540 R15: 0000000000000000
[ 646.051405] FS: 00007f193aa90700(0000) GS:ffff880226a00000(0000) knlGS:0000000000000000
[ 646.051405] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[ 646.051405] CR2: 0000000000000178 CR3: 00000000b17cb000 CR4: 00000000000006e0
[ 646.051405] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 646.051405] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[ 646.051405] Process dd (pid: 6149, threadinfo ffff880004ee0000, task ffff880004fc4540)
[ 646.051405] Stack:
[ 646.051405] ffff880004ee18f8 ffffffff81099aa3 0000000000000006 0000000000000002
[ 646.051405] 0000000000000000 0000000000008010 ffff880225806b00 ffff88005fc08d68
[ 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
[ 646.051405] [<ffffffff8107946a>] ? current_fs_time+0x27/0x2e
[ 646.051405] [<ffffffff8110198c>] __generic_file_aio_write+0x334/0x364
[ 646.051405] [<ffffffff8199e55c>] ? mutex_lock_nested+0x2e2/0x2f1
[ 646.051405] [<ffffffff81101a06>] ? generic_file_aio_write+0x4a/0xc1
[ 646.051405] [<ffffffff81101a22>] generic_file_aio_write+0x66/0xc1
[ 646.051405] [<ffffffff811ea020>] ext4_file_write+0x1f9/0x251
[ 646.051405] [<ffffffff8103c24b>] ? sched_clock+0x9/0xd
[ 646.051405] [<ffffffff8118180e>] ? fsnotify+0x216/0x26f
[ 646.051405] [<ffffffff8114d45e>] do_sync_write+0xce/0x10b
[ 646.051405] [<ffffffff8118180e>] ? fsnotify+0x216/0x26f
[ 646.051405] [<ffffffff8118166e>] ? fsnotify+0x76/0x26f
[ 646.051405] [<ffffffff8114dc1b>] vfs_write+0xb8/0x157
[ 646.051405] [<ffffffff8114ded2>] sys_write+0x4d/0x77
[ 646.051405] [<ffffffff819a6c02>] system_call_fastpath+0x16/0x1b
[ 646.051405] Code: bd 08 00 00 be d5 0b 00 00 48 c7 c7 86 41 d3 81 83 3d 82 f2 9f 01 00 0f 85 a4 08 00 00 e9 bb 03 00 00 41 83 fc 01 77 13 44 89 e0 <4c> 8b 6c c3 08 4d 85 ed 0f 85 5b 03 00 00 eb 34 41 83 fc 07 76
[ 646.051405] RIP [<ffffffff810a5092>] __lock_acquire+0x8b/0x932
[ 646.051405] RSP <ffff880004ee18d8>
[ 646.051405] CR2: 0000000000000178
[ 646.051405] ---[ end trace ebd0c8e3a842a6f1 ]---
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
next prev parent reply other threads:[~2012-01-05 1:56 UTC|newest]
Thread overview: 12+ 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 7:17 ` Yongqiang Yang
2011-12-18 11:32 ` Wu Fengguang
2012-01-05 1:56 ` Wu Fengguang [this message]
2012-01-05 2:23 ` Yongqiang Yang
2012-01-05 2:23 ` Yongqiang Yang
2012-01-05 2:25 ` Wu Fengguang
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
2012-01-08 14:06 ` Wu Fengguang
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20120105015609.GA7913@localhost \
--to=fengguang.wu@intel.com \
--cc=linux-ext4@vger.kernel.org \
--cc=linux-fsdevel@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=xiaoqiangnk@gmail.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.