Hi Greg, hi Sasha, Please consider to include following fixes in to stable tree. The 6 patches from Ming was fixing a deadlock, they are included around kernel 5.3/4. Would be good to included in 4.19, we hit it during testing, with the fix we no longer hit the deadlock. The md fixes is for a panic regarding handle flush. the last one is simple NULL pointer deref fix. Thanks! Jack Wang @ IONOS Cloud. Ming Lei (6): block: don't hold q->sysfs_lock in elevator_init_mq blk-mq: don't hold q->sysfs_lock in blk_mq_map_swqueue block: add helper for checking if queue is registered block: split .sysfs_lock into two locks block: fix race between switching elevator and removing queues block: don't release queue's sysfs lock during switching elevator Xiao Ni (1): md: Set prev_flush_start and flush_bio in an atomic way zhengbin (1): block: fix NULL pointer dereference in register_disk block/blk-core.c | 1 + block/blk-mq-sysfs.c | 12 +++++------ block/blk-mq.c | 7 ------ block/blk-sysfs.c | 49 +++++++++++++++++++++++++++--------------- block/blk-wbt.c | 2 +- block/blk.h | 2 +- block/elevator.c | 44 +++++++++++++++++++++---------------- block/genhd.c | 10 +++++---- drivers/md/md.c | 2 ++ include/linux/blkdev.h | 2 ++ 10 files changed, 76 insertions(+), 55 deletions(-) -- 2.25.1
