The upstream commit fef912bf860e8e7e48a2bfb978a356bba743a8b7 ("block: genhd: add 'groups' argument to device_add_disk") and the following patches fix a race condition of udev for several devices, including nvme, aoe, zram and virtio.
The stable tree commit 9e07f4e243791e00a4086ad86e573705cf7b2c65("zram: close udev startup race condition as default groups") only fixes zram, leaving other devices unfixed.
This udev race issue indeed makes trouble. We recently found that this issue can cause missing '/dev/disk/by-id/XXXX' symlink of virtio-blk devices on 4.19.
Be noted that this patch set follows the idea of stable commit 9e07f4e243791e00a4086ad86e573705cf7b2c65 ("zram: close udev startup race condition as default groups") of merging the preparation patch (commit fef912bf860e) and the fixing patch (commit 98af4d4df889).
Jeffle Xu (3): virtio-blk: close udev startup race condition as default groups aoe: close udev startup race condition as default groups nvme: close udev startup race condition as default groups
drivers/block/aoe/aoe.h | 1 - drivers/block/aoe/aoeblk.c | 20 +++---- drivers/block/aoe/aoedev.c | 1 - drivers/block/virtio_blk.c | 67 +++++++++++++--------- drivers/nvme/host/core.c | 20 +++---- drivers/nvme/host/lightnvm.c | 105 ++++++++++++++-------------------- drivers/nvme/host/multipath.c | 10 +--- drivers/nvme/host/nvme.h | 10 +--- 8 files changed, 103 insertions(+), 131 deletions(-)