Re: IMSM: Drive removed during I/O is set to faulty but not removed from volume

[Mateusz Kusiak <mateusz.kusiak@linux.intel.com>]

On 19.07.2024 09:02, Yu Kuai wrote:
> 
> Hi,
> 
> With some discussion and log collection, looks like this is a deadlock
> introduced by:
> 
> https://lore.kernel.org/r/20230825031622.1530464-8-yukuai1@huaweicloud.com
> 
> Root cause is that:
> 
> 1) New io is blocked because array is suspended;
> 2) md_start_sync suspend the array, and it's waiting for inflight IO to be done;
> 3) inflight IO is waiting for md_start_sync to be done, from
> md_start_write->flush_work().
> 
> Can you give following patch a test?
> 
> Thanks!
> Kuai
> 
> diff --git a/drivers/md/md.c b/drivers/md/md.c
> index 64693913ed18..10c2d816062a 100644
> --- a/drivers/md/md.c
> +++ b/drivers/md/md.c
> @@ -8668,7 +8668,6 @@ void md_write_start(struct mddev *mddev, struct bio *bi)
>          BUG_ON(mddev->ro == MD_RDONLY);
>          if (mddev->ro == MD_AUTO_READ) {
>                  /* need to switch to read/write */
> -               flush_work(&mddev->sync_work);
>                  mddev->ro = MD_RDWR;
>                  set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
>                  md_wakeup_thread(mddev->thread);
> 

Hi Kuai,
With the patch you provided the issue still reproduces.

Thanks,
Mateusz