On Sun, Apr 08, 2018 at 04:11:51PM +0800, Joseph Qi wrote:
> This is because scsi_remove_device() will call blk_cleanup_queue(), and
> then all blkgs have been destroyed and root_blkg is NULL.
> Thus tg is NULL and trigger NULL pointer dereference when get td from
> tg (tg->td).
> It seems that we cannot simply move blkcg_exit_queue() up to
> blk_cleanup_queue().

Maybe one per-queue blkcg should be introduced, which seems reasonable


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