On Fri, Feb 24, 2023 at 02:52:09PM +0800, Hou Tao wrote: > From: David Sloan <david.sloan@xxxxxxxxxxxxx> > > 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@xxxxxxxxxxxxx> > [logang@xxxxxxxxxxxx: rewrote commit message] > Signed-off-by: Logan Gunthorpe <logang@xxxxxxxxxxxx> > Signed-off-by: Song Liu <song@xxxxxxxxxx> > Signed-off-by: Hou Tao <houtao1@xxxxxxxxxx> > --- > 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
