# Re: md\_raid5 using 100% CPU and hang with status resync=PENDING, if a drive is removed during initialization

- From: Jes Sorensen \<hidden\>
- Date: 2015-02-16 22:49:57 
- List: linux-raid
- Page: https://ratatoskr.run/linux-raid/2015/02/6629028
- Thread: https://ratatoskr.run/linux-raid/2015/02/6629028/t.md

```text
Jes Sorensen [ref] writes:
> NeilBrown [ref] writes:
>> On Mon, 2 Feb 2015 07:10:14 +0000 Manibalan P [ref]
>> wrote:
>>
>>> Dear All,
>>> 	Any updates on this issue.
>>
>> Probably the same as:
>>
>>   http://marc.info/?l=linux-raid&m=142283560704091&w=2
>
> Hi Neil,
>
> I ran some tests on this one against the latest Linus' tree as of today
> (1fa185ebcbcefdc5229c783450c9f0439a69f0c1) which I believe includes all
> your pending 3.20 patches.
>
> I am able to reproduce Manibalan's hangs on a system with 4 SSDs if I
> run fio on top of a device while it is resyncing and I fail one of the
> devices.

Since Manibalan mentioned this issue wasn't present in earlier kernels,
I started trying to track down what change caused it.

So far I have been able to reproduce the hang as far back as 3.10.

Cheers,
Jes
```