GD_DEAD is only set if the device is really dead, then all pending IO will be failed.del_gendisk also sets GD_DEAD early on.No. The hang happens in fsync_bdev() of del_gendisk(), and there are IOs pending on bio_queue_enter().IFF we know we can't do I/O by the time del_gendisk is called, we need to call mark_disk_dead first and not paper over the problem. An API that force unfreezes is just broken and will leaves us with freezecount mismatches.
I absolutely agree here.
