On Fri, Feb 24, 2023 at 02:52:09PM +0800, Hou Tao wrote:
From: David Sloan david.sloan@eideticom.com
commit 5e8daf906f890560df430d30617c692a794acb73 upstream.
A race condition still exists when removing and re-creating md devices in test cases. However, it is only seen on some setups.
The race condition was tracked down to a reference still being held to the kobject by the rdev in the md_rdev_misc_wq which will be released in rdev_delayed_delete().
md_alloc() waits for previous deletions by waiting on the md_misc_wq, but the md_rdev_misc_wq may still be holding a reference to a recently removed device.
To fix this, also flush the md_rdev_misc_wq in md_alloc().
Signed-off-by: David Sloan david.sloan@eideticom.com [logang@deltatee.com: rewrote commit message] Signed-off-by: Logan Gunthorpe logang@deltatee.com Signed-off-by: Song Liu song@kernel.org Signed-off-by: Hou Tao houtao1@huawei.com
Hi Greg,
We found the problem also exists on v5.10, so could you please pick it up for v5.10 ?
Now queued up, thanks.
greg k-h