Hello, While going through if there are new util-linux bugs reported I came a cross this https://bugs.launchpad.net/ubuntu/+source/util-linux/+bug/1645846 Simple way to reproduce the issue is: d=$(cat /sys/class/zram-control/hot_add) && zramctl --size 256M /dev/zram$d I am not entirely sure, but drivers/block/zram/zram_drv.c function zram_add() should block until the device is usable. Looking the code that it might be the device_add_disk() from block/genhd.c that should do the blocking. But perhaps it's best if I leave such detail to people who know the code a bit better. One thing annoys me. I expected 'zramctl --find --size 256M' to suffer from same issue but it does not. I can only reproduce the issue when triggering hot_add separately, and as quick as possibly using the path. Notice that sometimes it takes second try before the hot_add and use triggers the issue. That is almost certainly down to speed the system in hand, e.g., quicker the computer less likely to trigger. -- Sami Kerola http://www.iki.fi/kerolasa/ -- To unsubscribe from this list: send the line "unsubscribe util-linux" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
