On Wed, 15 May 2013 20:11:52 +0800 "Mo, Moore" <Moore.Mo@xxxxxxxxxxx> wrote:
> Dear Neil,
>
> Thank you for your clue. I make deeper trace after that and found another suspicion point. Kernel maybe wakeup a mdk_thread which was kfree in failed case of mddev->pers->run(mddev).
>
> For make sure my guess, I add some printk in order to get more info. It seems that md_seq_show try to wake up a mdk_thread in mddev_unlock() before md_seq_show return, but the thread was kfree already by "out_free_conf" case of run() function in drivers/md/raid10.c.
>
> The Oops report as attached.
>
I don't really have time for bug reports against ancient kernels - sorry.
If you think you've found a bug, please at least look in the current mainline
kernel to see if the code has changed, and preferably reproduce against the
current mainline kernel.
In this case the bug was fixed by commit
01f96c0a9922cd9919baf9d16febdf7016177a12
18 months ago (linux 3.1).
NeilBrown
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