Date: Thu, 09 May 2013 07:59:31 +0000 (GMT)
From: EUNBONG SONG <eunb.song@samsung.com>
Subject: EXT4 panic at jbd2_journal_put_journal_head() in 3.9+
To: tytso@mit.edu, linux-ext4@vger.kernel.org,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
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Hello.
In my board, i ran the iozone with multi-thread option. 
My board has 8 cores and i enabled CONFIG_SMP. 
the iozone command as follow: iozone -l 20 -u 20 -r 64k -s 5m -o -F /user/f1 /user/f2 /user/f3 /user/f4 /user/f5 /user/f6 /user/f7 /user/f8 /user/f9 /user/f10 /user/f11 /user/f12 /user/f13 /user/f14 /user/f15 /user/f16 /user/f17 /user/f18 /user/f19 /user/f20

mount info as follow
cat /proc/mounts
/dev/sda3 /user ext4 rw,noatime,nodiratime,errors=panic,barrier=1,data=ordered 0 0

I got a message as below every time i ran iozone test. 


[ 4876.293124] [<ffffffff80272d18>] show_stack+0x68/0x80
[ 4876.309411] [<ffffffff802bde4c>] notifier_call_chain+0x5c/0xa8
[ 4876.315245] [<ffffffff802be524>] __atomic_notifier_call_chain+0x3c/0x58
[ 4876.321860] [<ffffffff802be588>] notify_die+0x38/0x48
[ 4876.326913] [<ffffffff80272548>] do_trap_or_bp+0x48/0x1a8
[ 4876.332312] [<ffffffff8026cfe4>] resume_userspace_check+0x0/0x10
[ 4876.338323] [<ffffffff80462994>] jbd2_journal_put_journal_head+0xcc/0x250
[ 4876.345111] [<ffffffff804603b4>] __jbd2_journal_remove_checkpoint+0x54/0x130
[ 4876.352160] [<ffffffff8045e630>] jbd2_journal_commit_transaction+0x1318/0x1ad0
[ 4876.359383] [<ffffffff80463f4c>] kjournald2+0x114/0x450
[ 4876.364611] [<ffffffff802b8160>] kthread+0xb8/0xc0
[ 4876.369402] [<ffffffff8026d060>] ret_from_kernel_thread+0x10/0x18

When i ran without multi-thread option, the problem was not ocurred.


Thanks. 

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