On Tue, 2018-06-19 at 15:00 +0800, Jianchao Wang wrote: > Currently, the kobject_del for kobjs of mq, hctx and ctx is invoked > under sysfs_lock, lock inversion will come up when other one is > acessing the associated sysfs file and trying to acquire the > sysfs_lock. To fix it, use mutex_trylock in blk_mq_sysfs_ops and > blk_mq_hw_sysfs_ops, if the lock in on contending, return -EAGAIN. Is this a theoretical issue or something you actually ran into? Which lock other than sysfs_lock do you think is involved in the lock inversion? Bart.
